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Subject: [PATCH v24 1/2] virtio-crypto: Add virtio crypto device specification
From: Gonglei <arei.gonglei@huawei.com>
The virtio crypto device is a virtual crypto device (ie. hardware
crypto accelerator card). Currently, the virtio crypto device provides
the following crypto services: CIPHER, MAC, HASH, and AEAD.
In this patch, CIPHER, MAC, HASH, AEAD services are introduced.
VIRTIO-153
Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Zhoujian <jianjay.zhou@huawei.com>
Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com>
---
acknowledgements.tex | 4 +
content.tex | 2 +
virtio-crypto.tex | 1533 ++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 1539 insertions(+)
create mode 100644 virtio-crypto.tex
diff --git a/acknowledgements.tex b/acknowledgements.tex
index 2d893d9..cdde247 100644
--- a/acknowledgements.tex
+++ b/acknowledgements.tex
@@ -16,10 +16,13 @@ Daniel Kiper, Oracle \newline
Geoff Brown, Machine-to-Machine Intelligence (M2MI) Corporation \newline
Gershon Janssen, Individual Member \newline
James Bottomley, Parallels IP Holdings GmbH \newline
+Jian Zhou, Huawei \newline
+Lei Gong, Huawei \newline
Luiz Capitulino, Red Hat \newline
Michael S. Tsirkin, Red Hat \newline
Paolo Bonzini, Red Hat \newline
Pawel Moll, ARM \newline
+Peng Long, Huawei \newline
Richard Sohn, Alcatel-Lucent \newline
Rusty Russell, IBM \newline
Sasha Levin, Oracle \newline
@@ -38,6 +41,7 @@ Brian Foley, ARM \newline
David Alan Gilbert, Red Hat \newline
Fam Zheng, Red Hat \newline
Gerd Hoffmann, Red Hat \newline
+Halil Pasic, IBM \newline
Jason Wang, Red Hat \newline
Laura Novich, Red Hat \newline
Patrick Durusau, Technical Advisory Board, OASIS \newline
diff --git a/content.tex b/content.tex
index c840588..d1d3b09 100644
--- a/content.tex
+++ b/content.tex
@@ -5819,6 +5819,8 @@ descriptor for the \field{sense_len}, \field{residual},
\field{status_qualifier}, \field{status}, \field{response} and
\field{sense} fields.
+\input{virtio-crypto.tex}
+
\chapter{Reserved Feature Bits}\label{sec:Reserved Feature Bits}
Currently these device-independent feature bits defined:
diff --git a/virtio-crypto.tex b/virtio-crypto.tex
new file mode 100644
index 0000000..cab0d68
--- /dev/null
+++ b/virtio-crypto.tex
@@ -0,0 +1,1533 @@
+\section{Crypto Device}\label{sec:Device Types / Crypto Device}
+
+The virtio crypto device is a virtual cryptography device as well as a
+virtual cryptographic accelerator. The virtio crypto device provides the
+following crypto services: CIPHER, MAC, HASH, and AEAD. Virtio crypto
+devices have a single control queue and at least one data queue. Crypto
+operation requests are placed into a data queue, and serviced by the
+device. Some crypto operation requests are only valid in the context of a
+session. The role of the control queue is facilitating control operation
+requests. Sessions management is realized with control operation
+requests.
+
+\subsection{Device ID}\label{sec:Device Types / Crypto Device / Device ID}
+
+20
+
+\subsection{Virtqueues}\label{sec:Device Types / Crypto Device / Virtqueues}
+
+\begin{description}
+\item[0] dataq1
+\item[\ldots]
+\item[N-1] dataqN
+\item[N] controlq
+\end{description}
+
+N is set by \field{max_dataqueues}.
+
+\subsection{Feature bits}\label{sec:Device Types / Crypto Device / Feature bits}
+
+\begin{description}
+\item VIRTIO_CRYPTO_F_REVISION_1 (0) revision 1. Revision 1 has a specific
+ request format and other enhancements (which result in some additional
+ requirements).
+\item VIRTIO_CRYPTO_F_CIPHER_STATELESS_MODE (1) stateless mode requests are
+ supported by the CIPHER service.
+\item VIRTIO_CRYPTO_F_HASH_STATELESS_MODE (2) stateless mode requests are
+ supported by the HASH service.
+\item VIRTIO_CRYPTO_F_MAC_STATELESS_MODE (3) stateless mode requests are
+ supported by the MAC service.
+\item VIRTIO_CRYPTO_F_AEAD_STATELESS_MODE (4) stateless mode requests are
+ supported by the AEAD service.
+\end{description}
+
+
+\subsubsection{Feature bit requirements}\label{sec:Device Types / Crypto Device / Feature bits}
+
+Some crypto feature bits require other crypto feature bits
+(see \ref{drivernormative:Basic Facilities of a Virtio Device / Feature Bits}):
+
+\begin{description}
+\item[VIRTIO_CRYPTO_F_CIPHER_STATELESS_MODE] Requires VIRTIO_CRYPTO_F_REVISION_1.
+\item[VIRTIO_CRYPTO_F_HASH_STATELESS_MODE] Requires VIRTIO_CRYPTO_F_REVISION_1.
+\item[VIRTIO_CRYPTO_F_MAC_STATELESS_MODE] Requires VIRTIO_CRYPTO_F_REVISION_1.
+\item[VIRTIO_CRYPTO_F_AEAD_STATELESS_MODE] Requires VIRTIO_CRYPTO_F_REVISION_1.
+\end{description}
+
+\subsection{Supported crypto services}\label{sec:Device Types / Crypto Device / Supported crypto services}
+
+The following crypto services are defined:
+
+\begin{lstlisting}
+/* CIPHER service */
+#define VIRTIO_CRYPTO_SERVICE_CIPHER 0
+/* HASH service */
+#define VIRTIO_CRYPTO_SERVICE_HASH 1
+/* MAC (Message Authentication Codes) service */
+#define VIRTIO_CRYPTO_SERVICE_MAC 2
+/* AEAD (Authenticated Encryption with Associated Data) service */
+#define VIRTIO_CRYPTO_SERVICE_AEAD 3
+\end{lstlisting}
+
+The above constants designate bits used to indicate the which of crypto services are
+offered by the device as described in, see \ref{sec:Device Types / Crypto Device / Device configuration layout}.
+
+\subsubsection{CIPHER services}\label{sec:Device Types / Crypto Device / Supported crypto services / CIPHER services}
+
+The following CIPHER algorithms are defined:
+
+\begin{lstlisting}
+#define VIRTIO_CRYPTO_NO_CIPHER 0
+#define VIRTIO_CRYPTO_CIPHER_ARC4 1
+#define VIRTIO_CRYPTO_CIPHER_AES_ECB 2
+#define VIRTIO_CRYPTO_CIPHER_AES_CBC 3
+#define VIRTIO_CRYPTO_CIPHER_AES_CTR 4
+#define VIRTIO_CRYPTO_CIPHER_DES_ECB 5
+#define VIRTIO_CRYPTO_CIPHER_DES_CBC 6
+#define VIRTIO_CRYPTO_CIPHER_3DES_ECB 7
+#define VIRTIO_CRYPTO_CIPHER_3DES_CBC 8
+#define VIRTIO_CRYPTO_CIPHER_3DES_CTR 9
+#define VIRTIO_CRYPTO_CIPHER_KASUMI_F8 10
+#define VIRTIO_CRYPTO_CIPHER_SNOW3G_UEA2 11
+#define VIRTIO_CRYPTO_CIPHER_AES_F8 12
+#define VIRTIO_CRYPTO_CIPHER_AES_XTS 13
+#define VIRTIO_CRYPTO_CIPHER_ZUC_EEA3 14
+\end{lstlisting}
+
+The above constants have two usages:
+\begin{enumerate}
+\item As bit numbers, used to tell the driver which CIPHER algorithms
+are supported by the device, see \ref{sec:Device Types / Crypto Device / Device configuration layout}.
+\item As values, used to designate the algorithm in (CIPHER type) crypto
+operation requests, see \ref{sec:Device Types / Crypto Device / Device Operation / Control Virtqueue / Session operation}.
+\end{enumerate}
+
+\subsubsection{HASH services}\label{sec:Device Types / Crypto Device / Supported crypto services / HASH services}
+
+The following HASH algorithms are defined:
+
+\begin{lstlisting}
+#define VIRTIO_CRYPTO_NO_HASH 0
+#define VIRTIO_CRYPTO_HASH_MD5 1
+#define VIRTIO_CRYPTO_HASH_SHA1 2
+#define VIRTIO_CRYPTO_HASH_SHA_224 3
+#define VIRTIO_CRYPTO_HASH_SHA_256 4
+#define VIRTIO_CRYPTO_HASH_SHA_384 5
+#define VIRTIO_CRYPTO_HASH_SHA_512 6
+#define VIRTIO_CRYPTO_HASH_SHA3_224 7
+#define VIRTIO_CRYPTO_HASH_SHA3_256 8
+#define VIRTIO_CRYPTO_HASH_SHA3_384 9
+#define VIRTIO_CRYPTO_HASH_SHA3_512 10
+#define VIRTIO_CRYPTO_HASH_SHA3_SHAKE128 11
+#define VIRTIO_CRYPTO_HASH_SHA3_SHAKE256 12
+\end{lstlisting}
+
+The above constants have two usages:
+\begin{enumerate}
+\item As bit numbers, used to tell the driver which HASH algorithms
+are supported by the device, see \ref{sec:Device Types / Crypto Device / Device configuration layout}.
+\item As values, used to designate the algorithm in (HASH type) crypto
+operation requires, see \ref{sec:Device Types / Crypto Device / Device Operation / Control Virtqueue / Session operation}.
+\end{enumerate}
+
+\subsubsection{MAC services}\label{sec:Device Types / Crypto Device / Supported crypto services / MAC services}
+
+The following MAC algorithms are defined:
+
+\begin{lstlisting}
+#define VIRTIO_CRYPTO_NO_MAC 0
+#define VIRTIO_CRYPTO_MAC_HMAC_MD5 1
+#define VIRTIO_CRYPTO_MAC_HMAC_SHA1 2
+#define VIRTIO_CRYPTO_MAC_HMAC_SHA_224 3
+#define VIRTIO_CRYPTO_MAC_HMAC_SHA_256 4
+#define VIRTIO_CRYPTO_MAC_HMAC_SHA_384 5
+#define VIRTIO_CRYPTO_MAC_HMAC_SHA_512 6
+#define VIRTIO_CRYPTO_MAC_CMAC_3DES 25
+#define VIRTIO_CRYPTO_MAC_CMAC_AES 26
+#define VIRTIO_CRYPTO_MAC_KASUMI_F9 27
+#define VIRTIO_CRYPTO_MAC_SNOW3G_UIA2 28
+#define VIRTIO_CRYPTO_MAC_GMAC_AES 41
+#define VIRTIO_CRYPTO_MAC_GMAC_TWOFISH 42
+#define VIRTIO_CRYPTO_MAC_CBCMAC_AES 49
+#define VIRTIO_CRYPTO_MAC_CBCMAC_KASUMI_F9 50
+#define VIRTIO_CRYPTO_MAC_XCBC_AES 53
+#define VIRTIO_CRYPTO_MAC_ZUC_EIA3 54
+\end{lstlisting}
+
+The above constants have two usages:
+\begin{enumerate}
+\item As bit numbers, used to tell the driver which MAC algorithms
+are supported by the device, see \ref{sec:Device Types / Crypto Device / Device configuration layout}.
+\item As values, used to designate the algorithm in (MAC type) crypto
+operation requests, see \ref{sec:Device Types / Crypto Device / Device Operation / Control Virtqueue / Session operation}.
+\end{enumerate}
+
+\subsubsection{AEAD services}\label{sec:Device Types / Crypto Device / Supported crypto services / AEAD services}
+
+The following AEAD algorithms are defined:
+
+\begin{lstlisting}
+#define VIRTIO_CRYPTO_NO_AEAD 0
+#define VIRTIO_CRYPTO_AEAD_GCM 1
+#define VIRTIO_CRYPTO_AEAD_CCM 2
+#define VIRTIO_CRYPTO_AEAD_CHACHA20_POLY1305 3
+\end{lstlisting}
+
+The above constants have two usages:
+\begin{enumerate}
+\item As bit numbers, used to tell the driver which AEAD algorithms
+are supported by the device, see \ref{sec:Device Types / Crypto Device / Device configuration layout}.
+\item As values, used to designate the algorithm in (DEAD type) crypto
+operation requests, see \ref{sec:Device Types / Crypto Device / Device Operation / Control Virtqueue / Session operation}.
+\end{enumerate}
+
+\subsection{Device configuration layout}\label{sec:Device Types / Crypto Device / Device configuration layout}
+
+\begin{lstlisting}
+struct virtio_crypto_config {
+ le32 status;
+ le32 max_dataqueues;
+ le32 crypto_services;
+ /* Detailed algorithms mask */
+ le32 cipher_algo_l;
+ le32 cipher_algo_h;
+ le32 hash_algo;
+ le32 mac_algo_l;
+ le32 mac_algo_h;
+ le32 aead_algo;
+ /* Maximum length of cipher key in bytes */
+ le32 max_cipher_key_len;
+ /* Maximum length of authenticated key in bytes */
+ le32 max_auth_key_len;
+ le32 reserved;
+ /* Maximum size of each crypto request's content in bytes */
+ le64 max_size;
+};
+\end{lstlisting}
+
+\begin{description}
+\item Currently, only one \field(status) bit is defined: VIRTIO_CRYPTO_S_HW_READY
+ set indicates that the device is ready to process requests, this bit is read-only
+ for the driver
+\begin{lstlisting}
+#define VIRTIO_CRYPTO_S_HW_READY (1 << 0)
+\end{lstlisting}
+
+\item[\field{max_dataqueues}] is the maximum number of data virtqueues that can
+ be configured by the device. The driver MAY use only one data queue, or it
+ can use more to achieve better performance.
+
+\item[\field{crypto_services}] crypto service offered, see \ref{sec:Device Types / Crypto Device / Supported crypto services}.
+
+\item[\field{cipher_algo_l}] CIPHER algorithms bits 0-31, see \ref{sec:Device Types / Crypto Device / Supported crypto services / CIPHER services}.
+
+\item[\field{cipher_algo_h}] CIPHER algorithms bits 32-63, see \ref{sec:Device Types / Crypto Device / Supported crypto services / CIPHER services}.
+
+\item[\field{hash_algo}] HASH algorithms bits, see \ref{sec:Device Types / Crypto Device / Supported crypto services / HASH services}.
+
+\item[\field{mac_algo_l}] MAC algorithms bits 0-31, see \ref{sec:Device Types / Crypto Device / Supported crypto services / MAC services}.
+
+\item[\field{mac_algo_h}] MAC algorithms bits 32-63, see \ref{sec:Device Types / Crypto Device / Supported crypto services / MAC services}.
+
+\item[\field{aead_algo}] AEAD algorithms bits, see \ref{sec:Device Types / Crypto Device / Supported crypto services / AEAD services}.
+
+\item[\field{max_cipher_key_len}] is the maximum length of cipher key supported by the device.
+
+\item[\field{max_auth_key_len}] is the maximum length of authenticated key supported by the device.
+
+\item[\field{reserved}] is reserved for future use.
+
+\item[\field{max_size}] is the maximum size of the variable-length parameters of
+ data operation of each crypto request's content supported by the device.
+\end{description}
+
+\begin{note}
+Unless explicitly stated otherwise all lengths and sizes are in bytes.
+\end{note}
+
+\devicenormative{\subsubsection}{Device configuration layout}{Device Types / Crypto Device / Device configuration layout}
+
+\begin{itemize*}
+\item The device MUST set \field{max_dataqueues} to between 1 and 65535 inclusive.
+\item The device MUST set the \field{status} with valid flags, undefined flags MUST NOT be set.
+\item The device MUST accept and handle requests after \field{status} is set to VIRTIO_CRYPTO_S_HW_READY.
+\item The device MUST set \field{crypto_services} based on the crypto services the device offers.
+\item The device MUST set detailed algorithms masks for each service advertised by \field{crypto_services}.
+ The device MUST NOT set the not defined algorithms bits.
+\item The device MUST set \field{max_size} to show the maximum size of crypto request the device supports.
+\item The device MUST set \field{max_cipher_key_len} to show the maximum length of cipher key if the
+ device supports CIPHER service.
+\item The device MUST set \field{max_auth_key_len} to show the maximum length of authenticated key if
+ the device supports MAC service.
+\end{itemize*}
+
+\drivernormative{\subsubsection}{Device configuration layout}{Device Types / Crypto Device / Device configuration layout}
+
+\begin{itemize*}
+\item The driver MUST read the \field{status} from the bottom bit of status to check whether the
+ VIRTIO_CRYPTO_S_HW_READY is set, and the driver MUST reread it after device reset.
+\item The driver MUST NOT transmit any requests to the device if the VIRTIO_CRYPTO_S_HW_READY is not set.
+\item The driver MUST read \field{max_dataqueues} field to discover the number of data queues the device supports.
+\item The driver MUST read \field{crypto_services} field to discover which services the device is able to offer.
+\item The driver SHOULD ignore the not defined algorithms bits.
+\item The driver MUST read the detailed algorithms fields based on \field{crypto_services} field.
+\item The driver SHOULD read \field{max_size} to discover the maximum size of the variable-length
+ parameters of data operation of the crypto request's content the device supports and MUST
+ guarantee the size of each crypto request's content within the \field{max_size}, otherwise
+ the request will fail and the driver MUST reset the device.
+\item The driver SHOULD read \field{max_cipher_key_len} to discover the maximum length of cipher key
+ the device supports and MUST guarantee the \filed{keylen} (CIPHER service) or \field{key_len}
+ (AEAD service) within the \field{max_cipher_key_len} of the device configuration, otherwise the
+ request will fail.
+\item The driver SHOULD read \field{max_auth_key_len} to discover the maximum length of authenticated
+ key the device supports and MUST guarantee the \filed{auth_key_len} (MAC service) within the
+ \field{max_auth_key_len} of the device configuration, otherwise the request will fail.
+\end{itemize*}
+
+\subsection{Device Initialization}\label{sec:Device Types / Crypto Device / Device Initialization}
+
+\drivernormative{\subsubsection}{Device Initialization}{Device Types / Crypto Device / Device Initialization}
+
+\begin{itemize*}
+\item The driver MUST configure and initialize all virtqueues.
+\item The driver MUST read the supported crypto services from bits of \field{crypto_services}.
+\item The driver MUST read the supported algorithms based on \field{crypto_services} field.
+\end{itemize*}
+
+\subsection{Device Operation}\label{sec:Device Types / Crypto Device / Device Operation}
+
+The operation of a virtio crypto device is driven by requests placed on the virtqueues.
+Requests consist of a queue-type specific header (specifying among others the operation)
+and an operation specific payload.
+
+If VIRTIO_CRYPTO_F_REVISION_1 is negotiated the device may support both session mode
+(See \ref{sec:Device Types / Crypto Device / Device Operation / Control Virtqueue / Session operation})
+and stateless mode operation requests.
+In stateless mode all operation parameters are supplied as a part of each request,
+while in session mode, some or all operation parameters are managed within the
+session. Stateless mode is guarded by feature bits 0-4 on a service level. If
+stateless mode is negotiated for a service, the service accepts both session
+mode and stateless requests; otherwise stateless mode requests are rejected
+(via operation status).
+
+\subsubsection{Operation Status}\label{sec:Device Types / Crypto Device / Device Operation / Operation status}
+The device MUST return a status code as part of the operation (both session
+operation and service operation) result. The valid operation status as follows:
+
+\begin{lstlisting}
+enum VIRTIO_CRYPTO_STATUS {
+ VIRTIO_CRYPTO_OK = 0,
+ VIRTIO_CRYPTO_ERR = 1,
+ VIRTIO_CRYPTO_BADMSG = 2,
+ VIRTIO_CRYPTO_NOTSUPP = 3,
+ VIRTIO_CRYPTO_INVSESS = 4,
+ VIRTIO_CRYPTO_NOSPC = 5,
+ VIRTIO_CRYPTO_MAX
+};
+\end{lstlisting}
+
+\begin{itemize*}
+\item VIRTIO_CRYPTO_OK: success.
+\item VIRTIO_CRYPTO_BADMSG: authentication failed (only when AEAD decryption).
+\item VIRTIO_CRYPTO_NOTSUPP: operation or algorithm is unsupported.
+\item VIRTIO_CRYPTO_INVSESS: invalid session ID when executing crypto operations.
+\item VIRTIO_CRYPTO_NOSPC: no free session ID (only when the VIRTIO_CRYPTO_F_REVISION_1
+ feature bit is negotiated).
+\item VIRTIO_CRYPTO_ERR: any failure not mentioned above occurs.
+\end{itemize*}
+
+\subsubsection{Control Virtqueue}\label{sec:Device Types / Crypto Device / Device Operation / Control Virtqueue}
+
+The driver uses the control virtqueue to send control commands to the
+device, such as session operations (See \ref{sec:Device Types / Crypto Device / Device
+Operation / Control Virtqueue / Session operation}).
+
+The header for controlq is of the following form:
+\begin{lstlisting}
+#define VIRTIO_CRYPTO_OPCODE(service, op) (((service) << 8) | (op))
+
+struct virtio_crypto_ctrl_header {
+#define VIRTIO_CRYPTO_CIPHER_CREATE_SESSION \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_CIPHER, 0x02)
+#define VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_CIPHER, 0x03)
+#define VIRTIO_CRYPTO_HASH_CREATE_SESSION \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_HASH, 0x02)
+#define VIRTIO_CRYPTO_HASH_DESTROY_SESSION \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_HASH, 0x03)
+#define VIRTIO_CRYPTO_MAC_CREATE_SESSION \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_MAC, 0x02)
+#define VIRTIO_CRYPTO_MAC_DESTROY_SESSION \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_MAC, 0x03)
+#define VIRTIO_CRYPTO_AEAD_CREATE_SESSION \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_AEAD, 0x02)
+#define VIRTIO_CRYPTO_AEAD_DESTROY_SESSION \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_AEAD, 0x03)
+ le32 opcode;
+ /* algo should be service-specific algorithms */
+ le32 algo;
+ le32 flag;
+ le32 reserved;
+};
+\end{lstlisting}
+
+The controlq request is composed of four parts:
+\begin{lstlisting}
+struct virtio_crypto_op_ctrl_req {
+ /* Device read only portion */
+
+ struct virtio_crypto_ctrl_header header;
+
+#define VIRTIO_CRYPTO_CTRLQ_OP_SPEC_HDR_LEGACY 56
+ /* fixed length fields, opcode specific */
+ u8 op_flf[flf_len];
+
+ /* variable length fields, opcode specific */
+ u8 op_vlf[vlf_len];
+
+ /* Device write only portion */
+
+ /* op result or completion status */
+ u8 op_outcome[outcome_len];
+};
+\end{lstlisting}
+
+\field{header} is a general header (see above).
+
+\field{op_flf} is the opcode (in \field{header}) specific fixed-length paramenters.
+
+\field{flf_len} depends on the VIRTIO_CRYPTO_F_REVISION_1 feature bit (see below).
+
+\field{op_vlf} is the opcode (in \field{header}) specific variable-length paramenters.
+
+\field{vlf_len} is the size of the specific structure used.
+\begin{note}
+The \field{vlf_len} of session-destroy operation and the hash-session-create
+operation is ZERO.
+\end{note}
+
+\begin{itemize*}
+\item If the opcode (in \field{header}) is VIRTIO_CRYPTO_CIPHER_CREATE_SESSION
+ then \field{op_flf} is struct virtio_crypto_sym_create_session_flf if
+ VIRTIO_CRYPTO_F_REVISION_1 is negotiated and struct virtio_crypto_sym_create_session_flf if
+ padded to 56 bytes if NOT negotiated, and \field{op_vlf} is struct
+ virtio_crypto_sym_create_session_vlf.
+\item If the opcode (in \field{header}) is VIRTIO_CRYPTO_HASH_CREATE_SESSION
+ then \field{op_flf} is struct virtio_crypto_hash_create_session_flf if
+ VIRTIO_CRYPTO_F_REVISION_1 is negotiated and struct virtio_crypto_hash_create_session_flf if
+ padded to 56 bytes if NOT negotiated.
+\item If the opcode (in \field{header}) is VIRTIO_CRYPTO_MAC_CREATE_SESSION
+ then \field{op_flf} is struct virtio_crypto_mac_create_session_flf if
+ VIRTIO_CRYPTO_F_REVISION_1 is negotiated and struct virtio_crypto_mac_create_session_flf if
+ padded to 56 bytes if NOT negotiated, and \field{op_vlf} is struct
+ virtio_crypto_mac_create_session_vlf.
+\end{itemize*}
+\item If the opcode (in \field{header}) is VIRTIO_CRYPTO_AEAD_CREATE_SESSION
+ then \field{op_flf} is struct virtio_crypto_aead_create_session_flf if
+ VIRTIO_CRYPTO_F_REVISION_1 is negotiated and struct virtio_crypto_aead_create_session_flf if
+ padded to 56 bytes if NOT negotiated, and \field{op_vlf} is struct
+ virtio_crypto_aead_create_session_vlf.
+\item If the opcode (in \field{header}) is VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION
+ or VIRTIO_CRYPTO_HASH_DESTROY_SESSION or VIRTIO_CRYPTO_MAC_DESTROY_SESSION or
+ VIRTIO_CRYPTO_AEAD_DESTROY_SESSION then \field{op_flf} is struct
+ virtio_crypto_destroy_session_flf if VIRTIO_CRYPTO_F_REVISION_1 is negotiated and
+ struct virtio_crypto_destroy_session_flf if padded to 56 bytes if NOT negotiated.
+\end{itemize*}
+
+\field{op_outcome} stores the result of operation and must be struct
+virtio_crypto_destroy_session_input for session-destroy operation or
+struct virtio_crypto_session_input.
+
+\field{outcome_len} is the size of the structure used.
+
+
+\paragraph{Session operation}\label{sec:Device Types / Crypto Device / Device
+Operation / Control Virtqueue / Session operation}
+
+The session is a handle which describes the cryptographic parameters to be
+applied to a number of buffers.
+
+The following structure stores the result of session creation set by the device:
+
+\begin{lstlisting}
+struct virtio_crypto_session_input {
+ le64 session_id;
+ le32 status;
+ le32 padding;
+};
+\end{lstlisting}
+
+A request to destroy a session includes the following information:
+
+\begin{lstlisting}
+struct virtio_crypto_destroy_session_flf {
+ /* Device read only portion */
+ le64 session_id;
+};
+
+struct virtio_crypto_destroy_session_input {
+ /* Device write only portion */
+ le32 status;
+ le32 padding;
+};
+\end{lstlisting}
+
+
+\subparagraph{Session operation: HASH session}\label{sec:Device Types / Crypto Device / Device
+Operation / Control Virtqueue / Session operation / Session operation: HASH session}
+
+The fixed-length paramenters of HASH session requests is as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_hash_create_session_flf {
+ /* Device read only portion */
+
+ /* See VIRTIO_CRYPTO_HASH_* above */
+ le32 algo;
+ /* hash result length */
+ le32 hash_result_len;
+};
+\end{lstlisting}
+
+
+\subparagraph{Session operation: MAC session}\label{sec:Device Types / Crypto Device / Device
+Operation / Control Virtqueue / Session operation / Session operation: MAC session}
+
+The fixed-length and the variable-length parameters of MAC session requests are as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_mac_create_session_flf {
+ /* Device read only portion */
+
+ /* See VIRTIO_CRYPTO_MAC_* above */
+ le32 algo;
+ /* hash result length */
+ le32 hash_result_len;
+ /* length of authenticated key */
+ le32 auth_key_len;
+ le32 padding;
+};
+
+struct virtio_crypto_mac_create_session_vlf {
+ /* Device read only portion */
+
+ /* The authenticated key */
+ u8 auth_key[auth_key_len];
+};
+\end{lstlisting}
+
+The length of \field{auth_key} is specified in \field{auth_key_len} in the struct
+virtio_crypto_mac_create_session_flf.
+
+
+\subparagraph{Session operation: Symmetric algorithms session}\label{sec:Device Types / Crypto Device / Device
+Operation / Control Virtqueue / Session operation / Session operation: Symmetric algorithms session}
+
+The request of symmetric session could be the CIPHER algorithms request
+or the chain algorithms (chaining CIPHER and HASH/MAC) request.
+
+The fixed-length and the variable-length parameters of CIPHER session requests are as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_cipher_session_flf {
+ /* Device read only portion */
+
+ /* See VIRTIO_CRYPTO_CIPHER* above */
+ le32 algo;
+ /* length of key */
+ le32 keylen;
+#define VIRTIO_CRYPTO_OP_ENCRYPT 1
+#define VIRTIO_CRYPTO_OP_DECRYPT 2
+ /* encryption or decryption */
+ le32 op;
+ le32 padding;
+};
+
+struct virtio_crypto_cipher_session_vlf {
+ /* Device read only portion */
+
+ /* The cipher key */
+ u8 cipher_key[keylen];
+};
+\end{lstlisting}
+
+The length of \field{cipher_key} is specified in \field{keylen} in the struct
+virtio_crypto_cipher_session_flf.
+
+The fixed-length and the variable-length parameters of Chain session requests are as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_alg_chain_session_flf {
+ /* Device read only portion */
+
+#define VIRTIO_CRYPTO_SYM_ALG_CHAIN_ORDER_HASH_THEN_CIPHER 1
+#define VIRTIO_CRYPTO_SYM_ALG_CHAIN_ORDER_CIPHER_THEN_HASH 2
+ le32 alg_chain_order;
+/* Plain hash */
+#define VIRTIO_CRYPTO_SYM_HASH_MODE_PLAIN 1
+/* Authenticated hash (mac) */
+#define VIRTIO_CRYPTO_SYM_HASH_MODE_AUTH 2
+/* Nested hash */
+#define VIRTIO_CRYPTO_SYM_HASH_MODE_NESTED 3
+ le32 hash_mode;
+ struct virtio_crypto_cipher_session_flf cipher_hdr;
+
+#define VIRTIO_CRYPTO_ALG_CHAIN_SESS_OP_SPEC_HDR_SIZE 16
+ /* fixed length fields, algo specific */
+ u8 algo_flf[VIRTIO_CRYPTO_ALG_CHAIN_SESS_OP_SPEC_HDR_SIZE];
+
+ /* length of the additional authenticated data (AAD) in bytes */
+ le32 aad_len;
+ le32 padding;
+};
+
+struct virtio_crypto_alg_chain_session_vlf {
+ /* Device read only portion */
+
+ /* The cipher key */
+ u8 cipher_key[keylen];
+ /* The authenticated key */
+ u8 auth_key[auth_key_len];
+};
+\end{lstlisting}
+
+\field{hash_mode} decides the type used by \field{algo_flf}.
+
+\field{algo_flf} is fixed to 16 bytes and MUST contains or be one of
+the following types:
+\begin{itemize*}
+\item struct virtio_crypto_hash_create_session_flf
+\item struct virtio_crypto_mac_create_session_flf
+\end{itemize*}
+The data of unused part (if has) in \field{algo_flf} will be ignored.
+
+The length of \field{cipher_key} is specified in \field{keylen} in \field{cipher_hdr}.
+
+The length of \field{auth_key} is specified in \field{auth_key_len} in struct
+virtio_crypto_mac_create_session_flf.
+
+The fixed-length parameters of Symmetric session requests are as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_sym_create_session_flf {
+ /* Device read only portion */
+
+#define VIRTIO_CRYPTO_SYM_SESS_OP_SPEC_HDR_SIZE 48
+ /* fixed length fields, opcode specific */
+ u8 op_flf[VIRTIO_CRYPTO_SYM_SESS_OP_SPEC_HDR_SIZE];
+
+/* No operation */
+#define VIRTIO_CRYPTO_SYM_OP_NONE 0
+/* Cipher only operation on the data */
+#define VIRTIO_CRYPTO_SYM_OP_CIPHER 1
+/* Chain any cipher with any hash or mac operation. The order
+ depends on the value of alg_chain_order param */
+#define VIRTIO_CRYPTO_SYM_OP_ALGORITHM_CHAINING 2
+ le32 op_type;
+ le32 padding;
+};
+\end{lstlisting}
+
+\field{op_flf} is fixed to 48 bytes, MUST contains or be one of
+the following types:
+\begin{itemize*}
+\item struct virtio_crypto_cipher_session_flf
+\item struct virtio_crypto_alg_chain_session_flf
+\end{itemize*}
+The data of unused part (if has) in \field{op_flf} will be ignored.
+
+\field{op_type} decides the type used by \field{op_flf}.
+
+The variable-length parameters of Symmetric session requests are as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_sym_create_session_vlf {
+ /* Device read only portion */
+ /* variable length fields, opcode specific */
+ u8 op_vlf[vlf_len];
+};
+\end{lstlisting}
+
+\field{op_vlf} MUST contains or be one of the following types:
+\begin{itemize*}
+\item struct virtio_crypto_cipher_session_vlf
+\item struct virtio_crypto_alg_chain_session_vlf
+\end{itemize*}
+
+\field{op_type} in struct virtio_crypto_sym_create_session_flf decides the
+type used by \field{op_vlf}.
+
+\field{vlf_len} is the size of the specific structure used.
+
+
+\subparagraph{Session operation: AEAD session}\label{sec:Device Types / Crypto Device / Device
+Operation / Control Virtqueue / Session operation / Session operation: AEAD session}
+
+The fixed-length and the variable-length parameters of AEAD session requests are as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_aead_create_session_flf {
+ /* Device read only portion */
+
+ /* See VIRTIO_CRYPTO_AEAD_* above */
+ le32 algo;
+ /* length of key */
+ le32 key_len;
+ /* Authentication tag length */
+ le32 tag_len;
+ /* The length of the additional authenticated data (AAD) in bytes */
+ le32 aad_len;
+ /* encryption or decryption, See above VIRTIO_CRYPTO_OP_* */
+ le32 op;
+ le32 padding;
+};
+
+struct virtio_crypto_aead_create_session_vlf {
+ /* Device read only portion */
+ u8 key[key_len];
+};
+\end{lstlisting}
+
+The length of \field{key} is specified in \field{key_len} in struct
+virtio_crypto_aead_create_session_flf.
+
+
+\drivernormative{\subparagraph}{Session operation: create session}{Device Types / Crypto Device / Device
+Operation / Control Virtqueue / Session operation / Session operation: create session}
+
+\begin{itemize*}
+\item The driver MUST set the \field{opcode} field based on service type: CIPHER, HASH, MAC, or AEAD.
+\item The driver MUST set the control general header, the opcode specific header,
+ the opcode specific extra parameters and the opcode specific outcome buffer in turn.
+ See \ref{sec:Device Types / Crypto Device / Device Operation / Control Virtqueue}.
+\item The driver MUST set the \field{reversed} field to zero.
+\end{itemize*}
+
+\devicenormative{\subparagraph}{Session operation: create session}{Device Types / Crypto Device / Device
+Operation / Control Virtqueue / Session operation / Session operation: create session}
+
+\begin{itemize*}
+\item The device MUST use the corresponding opcode specific structure according to the
+ \field{opcode} in the control general header.
+\item The device MUST extract extra parameters according to the structures used.
+\item The device MUST set the \field{status} field to one of the following values of enum
+ VIRTIO_CRYPTO_STATUS after finish a session creation:
+\begin{itemize*}
+\item VIRTIO_CRYPTO_OK if a session is created successfully.
+\item VIRTIO_CRYPTO_NOTSUPP if the requested algorithm or operation is unsupported.
+\item VIRTIO_CRYPTO_NOSPC if no free session ID (only when the VIRTIO_CRYPTO_F_REVISION_1
+ feature bit is negotiated).
+\item VIRTIO_CRYPTO_ERR if failure not mentioned above occurs.
+\end{itemize*}
+\item The device MUST set the \field{session_id} field to a unique session identifier only
+ if the status is set to VIRTIO_CRYPTO_OK.
+\end{itemize*}
+
+\drivernormative{\subparagraph}{Session operation: destroy session}{Device Types / Crypto Device / Device
+Operation / Control Virtqueue / Session operation / Session operation: destroy session}
+
+\begin{itemize*}
+\item The driver MUST set the \field{opcode} field based on service type: CIPHER, HASH, MAC, or AEAD.
+\item The driver MUST set the \field{session_id} to a valid value assigned by the device
+ when the session was created.
+\end{itemize*}
+
+\devicenormative{\subparagraph}{Session operation: destroy session}{Device Types / Crypto Device / Device
+Operation / Control Virtqueue / Session operation / Session operation: destroy session}
+
+\begin{itemize*}
+\item The device MUST set the \field{status} field to one of the following values of enum VIRTIO_CRYPTO_STATUS.
+\begin{itemize*}
+\item VIRTIO_CRYPTO_OK if a session is created successfully.
+\item VIRTIO_CRYPTO_ERR if any failure occurs.
+\end{itemize*}
+\end{itemize*}
+
+
+\subsubsection{Data Virtqueue}\label{sec:Device Types / Crypto Device / Device Operation / Data Virtqueue}
+
+The driver uses the data virtqueues to transmit crypto operation requests to the device,
+and completes the crypto operations.
+
+The header for dataq is as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_op_header {
+#define VIRTIO_CRYPTO_CIPHER_ENCRYPT \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_CIPHER, 0x00)
+#define VIRTIO_CRYPTO_CIPHER_DECRYPT \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_CIPHER, 0x01)
+#define VIRTIO_CRYPTO_HASH \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_HASH, 0x00)
+#define VIRTIO_CRYPTO_MAC \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_MAC, 0x00)
+#define VIRTIO_CRYPTO_AEAD_ENCRYPT \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_AEAD, 0x00)
+#define VIRTIO_CRYPTO_AEAD_DECRYPT \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_AEAD, 0x01)
+ le32 opcode;
+ /* algo should be service-specific algorithms */
+ le32 algo;
+ le64 session_id;
+#define VIRTIO_CRYPTO_FLAG_SESSION_MODE 1
+ /* control flag to control the request */
+ le32 flag;
+ le32 padding;
+};
+\end{lstlisting}
+
+\begin{note}
+If VIRTIO_CRYPTO_F_REVISION_1 is not negotiated the \field{flag} is ignored.
+
+If VIRTIO_CRYPTO_F_REVISION_1 is negotiated but VIRTIO_CRYPTO_F_<SERVICE>_STATELESS_MODE
+is not negotiated, then the device should reject <SERVICE> requests if
+VIRTIO_CRYPTO_FLAG_SESSION_MODE is not set (in \field{flag}).
+\end{note}
+
+The dataq request is composed of four parts:
+\begin{lstlisting}
+struct virtio_crypto_op_data_req {
+ /* Device read only portion */
+
+ struct virtio_crypto_op_header header;
+
+#define VIRTIO_CRYPTO_DATAQ_OP_SPEC_HDR_LEGACY 48
+ /* fixed length fields, opcode specific */
+ u8 op_flf[flf_len];
+
+ /* Device read && write portion */
+ /* variable length fields, opcode specific */
+ u8 op_vlf[vlf_len];
+
+ /* Device write only portion */
+ struct virtio_crypto_inhdr inhdr;
+};
+\end{lstlisting}
+
+\field{header} is a general header (see above).
+
+\field{op_flf} is the opcode (in \field{header}) specific header.
+
+\field{flf_len} depends on the VIRTIO_CRYPTO_F_REVISION_1 feature bit
+(see below).
+
+\field{op_vlf} is the opcode (in \field{header}) specific parameters.
+
+\field{vlf_len} is the size of the specific structure used.
+
+\begin{itemize*}
+\item If the the opcode (in \field{header}) is VIRTIO_CRYPTO_CIPHER_ENCRYPT
+ or VIRTIO_CRYPTO_CIPHER_DECRYPT then:
+ \begin{itemize*}
+ \item If VIRTIO_CRYPTO_F_CIPHER_STATELESS_MODE is negotiated, \field{op_flf} is
+ struct virtio_crypto_sym_data_flf_stateless, and \field{op_vlf} is struct
+ virtio_crypto_sym_data_vlf_stateless.
+ \item If VIRTIO_CRYPTO_F_CIPHER_STATELESS_MODE is NOT negotiated, \field{op_flf}
+ is struct virtio_crypto_sym_data_flf if VIRTIO_CRYPTO_F_REVISION_1 is negotiated
+ and struct virtio_crypto_sym_data_flf if padded to 48 bytes if NOT negotiated,
+ and \field{op_vlf} is struct virtio_crypto_sym_data_vlf.
+ \end{itemize*}
+\item If the the opcode (in \field{header}) is VIRTIO_CRYPTO_HASH:
+ \begin{itemize*}
+ \item If VIRTIO_CRYPTO_F_HASH_STATELESS_MODE is negotiated, \field{op_flf} is
+ struct virtio_crypto_hash_data_flf_stateless, and \field{op_vlf} is struct
+ virtio_crypto_hash_data_vlf_stateless.
+ \item If VIRTIO_CRYPTO_F_HASH_STATELESS_MODE is NOT negotiated, \field{op_flf}
+ is struct virtio_crypto_hash_data_flf if VIRTIO_CRYPTO_F_REVISION_1 is negotiated
+ and struct virtio_crypto_hash_data_flf if padded to 48 bytes if NOT negotiated,
+ and \field{op_vlf} is struct virtio_crypto_hash_data_vlf.
+\item If the the opcode (in \field{header}) is VIRTIO_CRYPTO_MAC:
+ \begin{itemize*}
+ \item If VIRTIO_CRYPTO_F_MAC_STATELESS_MODE is negotiated, \field{op_flf} is
+ struct virtio_crypto_mac_data_flf_stateless, and \field{op_vlf} is struct
+ virtio_crypto_mac_data_vlf_stateless.
+ \item If VIRTIO_CRYPTO_F_MAC_STATELESS_MODE is NOT negotiated, \field{op_flf}
+ is struct virtio_crypto_mac_data_flf if VIRTIO_CRYPTO_F_REVISION_1 is negotiated
+ and struct virtio_crypto_mac_data_flf if padded to 48 bytes if NOT negotiated,
+ and \field{op_vlf} is struct virtio_crypto_mac_data_vlf.
+\item If the the opcode (in \field{header}) is VIRTIO_CRYPTO_AEAD_ENCRYPT
+ or VIRTIO_CRYPTO_AEAD_DECRYPT then:
+ \begin{itemize*}
+ \item If VIRTIO_CRYPTO_F_AEAD_STATELESS_MODE is negotiated, \field{op_flf} is
+ struct virtio_crypto_aead_data_flf_stateless, and \field{op_vlf} is struct
+ virtio_crypto_aead_data_vlf_stateless.
+ \item If VIRTIO_CRYPTO_F_AEAD_STATELESS_MODE is NOT negotiated, \field{op_flf}
+ is struct virtio_crypto_aead_data_flf if VIRTIO_CRYPTO_F_REVISION_1 is negotiated
+ and struct virtio_crypto_aead_data_flf if padded to 48 bytes if NOT negotiated,
+ and \field{op_vlf} is struct virtio_crypto_aead_data_vlf.
+\end{itemize*}
+
+\field{inhdr} is a unified input header that used to return the status of
+the operations, is defined as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_inhdr {
+ u8 status;
+};
+\end{lstlisting}
+
+\subsubsection{HASH Service Operation}\label{sec:Device Types / Crypto Device / Device Operation / HASH Service Operation}
+
+Session mode HASH service requests are as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_hash_data_flf {
+ /* length of source data */
+ le32 src_data_len;
+ /* hash result length */
+ le32 hash_result_len;
+};
+
+struct virtio_crypto_hash_data_vlf {
+ /* Device read only portion */
+ /* Source data */
+ u8 src_data[src_data_len];
+
+ /* Device write only portion */
+ /* Hash result data */
+ u8 hash_result[hash_result_len];
+};
+\end{lstlisting}
+
+Each data request uses the virtio_crypto_hash_data_flf structure and the
+virtio_crypto_hash_data_vlfto structure to store information used to run the
+HASH operations.
+
+\field{src_data} is the source data that will be processed.
+\field{src_data_len} is the length of source data.
+\field{hash_result} is the result data and \field{hash_result_len} is the length
+of it.
+
+Stateless mode HASH service requests are as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_hash_data_flf_stateless {
+ struct {
+ /* See VIRTIO_CRYPTO_HASH_* above */
+ le32 algo;
+ } sess_para;
+
+ /* length of source data */
+ le32 src_data_len;
+ /* hash result length */
+ le32 hash_result_len;
+ le32 reserved;
+};
+struct virtio_crypto_hash_data_vlf_stateless {
+ /* Device read only portion */
+ /* Source data */
+ u8 src_data[src_data_len];
+
+ /* Device write only portion */
+ /* Hash result data */
+ u8 hash_result[hash_result_len];
+};
+\end{lstlisting}
+
+\drivernormative{\paragraph}{HASH Service Operation}{Device Types / Crypto Device / Device Operation / HASH Service Operation}
+
+\begin{itemize*}
+\item If the driver uses the session mode, then the driver MUST set \field{session_id}
+ in struct virtio_crypto_op_header to a valid value assigned by the device when the
+ session was created.
+\item If the VIRTIO_CRYPTO_F_HASH_STATELESS_MODE feature bit is negotiated, 1) if the
+ driver uses the stateless mode, then the driver MUST set the \field{flag} field in
+ struct virtio_crypto_op_header to ZERO and MUST set the fields in struct
+ virtio_crypto_hash_data_flf_stateless.sess_para, 2) if the driver uses the session
+ mode, then the driver MUST set the \field{flag} field in struct virtio_crypto_op_header
+ to VIRTIO_CRYPTO_FLAG_SESSION_MODE.
+\item The driver MUST set \field{opcode} in struct virtio_crypto_op_header to VIRTIO_CRYPTO_HASH.
+\end{itemize*}
+
+\devicenormative{\paragraph}{HASH Service Operation}{Device Types / Crypto Device / Device Operation / HASH Service Operation}
+
+\begin{itemize*}
+\item The device MUST use the corresponding structure according to the \field{opcode}
+ in the data general header.
+\item If the VIRTIO_CRYPTO_F_HASH_STATELESS_MODE feature bit is negotiated, the device
+ MUST parse \field{flag} field in struct virtio_crypto_op_header in order to decide
+ which mode the driver uses.
+\item The device MUST copy the results of HASH operations in the hash_result[] if HASH
+ operations success.
+\item The device MUST set \field{status} in struct virtio_crypto_inhdr to one of the
+ following values of enum VIRTIO_CRYPTO_STATUS:
+\begin{itemize*}
+\item VIRTIO_CRYPTO_OK if the operation success.
+\item VIRTIO_CRYPTO_NOTSUPP if the requested algorithm or operation is unsupported.
+\item VIRTIO_CRYPTO_INVSESS if the session ID invalid when in session mode.
+\item VIRTIO_CRYPTO_ERR if any failure not mentioned above occurs.
+\end{itemize*}
+\end{itemize*}
+
+
+\subsubsection{MAC Service Operation}\label{sec:Device Types / Crypto Device / Device Operation / MAC Service Operation}
+
+Session mode MAC service requests are as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_mac_data_flf {
+ struct virtio_crypto_hash_data_flf hdr;
+};
+
+struct virtio_crypto_mac_data_vlf {
+ /* Device read only portion */
+ /* Source data */
+ u8 src_data[src_data_len];
+
+ /* Device write only portion */
+ /* Hash result data */
+ u8 hash_result[hash_result_len];
+};
+\end{lstlisting}
+
+Each request uses the virtio_crypto_mac_data_flf structure and the
+virtio_crypto_mac_data_vlf structure to store information used to run the
+MAC operations.
+
+\field{src_data} is the source data that will be processed.
+\field{src_data_len} is the length of source data.
+\field{hash_result} is the result data and \field{hash_result_len} is the length
+of it.
+
+Stateless mode MAC service requests are as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_mac_data_flf_stateless {
+ struct {
+ /* See VIRTIO_CRYPTO_MAC_* above */
+ le32 algo;
+ /* length of authenticated key */
+ le32 auth_key_len;
+ } sess_para;
+
+ /* length of source data */
+ le32 src_data_len;
+ /* hash result length */
+ le32 hash_result_len;
+};
+
+struct virtio_crypto_mac_data_vlf_stateless {
+ /* Device read only portion */
+ /* The authenticated key */
+ u8 auth_key[auth_key_len];
+ /* Source data */
+ u8 src_data[src_data_len];
+
+ /* Device write only portion */
+ /* Hash result data */
+ u8 hash_result[hash_result_len];
+};
+\end{lstlisting}
+
+\field{auth_key} is the authenticated key that will be used during the process.
+\field{auth_key_len} is the length of the key.
+
+\drivernormative{\paragraph}{MAC Service Operation}{Device Types / Crypto Device / Device Operation / MAC Service Operation}
+
+\begin{itemize*}
+\item If the driver uses the session mode, then the driver MUST set \field{session_id}
+ in struct virtio_crypto_op_header to a valid value assigned by the device when the
+ session was created.
+\item If the VIRTIO_CRYPTO_F_MAC_STATELESS_MODE feature bit is negotiated, 1) if the
+ driver uses the stateless mode, then the driver MUST set the \field{flag} field
+ in struct virtio_crypto_op_header to ZERO and MUST set the fields in struct
+ virtio_crypto_mac_data_flf_stateless.sess_para, 2) if the driver uses the session
+ mode, then the driver MUST set the \field{flag} field in struct virtio_crypto_op_header
+ to VIRTIO_CRYPTO_FLAG_SESSION_MODE.
+\item The driver MUST set \field{opcode} in struct virtio_crypto_op_header to VIRTIO_CRYPTO_MAC.
+\end{itemize*}
+
+\devicenormative{\paragraph}{MAC Service Operation}{Device Types / Crypto Device / Device Operation / MAC Service Operation}
+
+\begin{itemize*}
+\item If the VIRTIO_CRYPTO_F_MAC_STATELESS_MODE feature bit is negotiated, the device
+ MUST parse \field{flag} field in struct virtio_crypto_op_header in order to decide
+ which mode the driver uses.
+\item The device MUST copy the results of MAC operations in the hash_result[] if HASH
+ operations success.
+\item The device MUST set \field{status} in struct virtio_crypto_inhdr to one of the
+ following values of enum VIRTIO_CRYPTO_STATUS:
+\begin{itemize*}
+\item VIRTIO_CRYPTO_OK if the operation success.
+\item VIRTIO_CRYPTO_NOTSUPP if the requested algorithm or operation is unsupported.
+\item VIRTIO_CRYPTO_INVSESS if the session ID invalid when in session mode.
+\item VIRTIO_CRYPTO_ERR if any failure not mentioned above occurs.
+\end{itemize*}
+\end{itemize*}
+
+\subsubsection{Symmetric algorithms Operation}\label{sec:Device Types / Crypto Device / Device Operation / Symmetric algorithms Operation}
+
+Session mode CIPHER service requests are as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_cipher_data_flf {
+ /*
+ * Byte Length of valid IV/Counter data pointed to by the below iv data.
+ *
+ * For block ciphers in CBC or F8 mode, or for Kasumi in F8 mode, or for
+ * SNOW3G in UEA2 mode, this is the length of the IV (which
+ * must be the same as the block length of the cipher).
+ * For block ciphers in CTR mode, this is the length of the counter
+ * (which must be the same as the block length of the cipher).
+ */
+ le32 iv_len;
+ /* length of source data */
+ le32 src_data_len;
+ /* length of destination data */
+ le32 dst_data_len;
+ le32 padding;
+};
+
+struct virtio_crypto_cipher_data_vlf {
+ /* Device read only portion */
+
+ /*
+ * Initialization Vector or Counter data.
+ *
+ * For block ciphers in CBC or F8 mode, or for Kasumi in F8 mode, or for
+ * SNOW3G in UEA2 mode, this is the Initialization Vector (IV)
+ * value.
+ * For block ciphers in CTR mode, this is the counter.
+ * For AES-XTS, this is the 128bit tweak, i, from IEEE Std 1619-2007.
+ *
+ * The IV/Counter will be updated after every partial cryptographic
+ * operation.
+ */
+ u8 iv[iv_len];
+ /* Source data */
+ u8 src_data[src_data_len];
+
+ /* Device write only portion */
+ /* Destination data */
+ u8 dst_data[dst_data_len];
+};
+\end{lstlisting}
+
+Session mode requests of algorithm chaining are as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_alg_chain_data_flf {
+ le32 iv_len;
+ /* Length of source data */
+ le32 src_data_len;
+ /* Length of destination data */
+ le32 dst_data_len;
+ /* Starting point for cipher processing in source data */
+ le32 cipher_start_src_offset;
+ /* Length of the source data that the cipher will be computed on */
+ le32 len_to_cipher;
+ /* Starting point for hash processing in source data */
+ le32 hash_start_src_offset;
+ /* Length of the source data that the hash will be computed on */
+ le32 len_to_hash;
+ /* Length of the additional auth data */
+ le32 aad_len;
+ /* Length of the hash result */
+ le32 hash_result_len;
+ le32 reserved;
+};
+
+struct virtio_crypto_alg_chain_data_vlf {
+ /* Device read only portion */
+
+ /* Initialization Vector or Counter data */
+ u8 iv[iv_len];
+ /* Source data */
+ u8 src_data[src_data_len];
+ /* Additional authenticated data if exists */
+ u8 aad[aad_len];
+
+ /* Device write only portion */
+
+ /* Destination data */
+ u8 dst_data[dst_data_len];
+ /* Hash result data */
+ u8 hash_result[hash_result_len];
+};
+\end{lstlisting}
+
+Session mode requests of symmetric algorithm are as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_sym_data_flf {
+ /* Device read only portion */
+
+#define VIRTIO_CRYPTO_SYM_DATA_REQ_HDR_SIZE 40
+ u8 op_type_flf[VIRTIO_CRYPTO_SYM_DATA_REQ_HDR_SIZE];
+
+ /* See above VIRTIO_CRYPTO_SYM_OP_* */
+ le32 op_type;
+ le32 padding;
+};
+
+struct virtio_crypto_sym_data_vlf {
+ u8 op_type_vlf[sym_para_len];
+};
+\end{lstlisting}
+
+Each request uses the virtio_crypto_sym_data_flf structure and the
+virtio_crypto_sym_data_flf structure to store information used to run the
+CIPHER operations.
+
+\field{op_type_flf} is the \field{op_type} specific header, it MUST starts
+with or be one of the following structures:
+\begin{itemize*}
+\item struct virtio_crypto_cipher_data_flf
+\item struct virtio_crypto_alg_chain_data_flf
+\end{itemize*}
+
+The length of \field{op_type_flf} is fixed to 40 bytes, the data of unused
+part (if has) will be ingored.
+
+\field{op_type_vlf} is the \field{op_type} specific parameters, it MUST starts
+with or be one of the following structures:
+\begin{itemize*}
+\item struct virtio_crypto_cipher_data_vlf
+\item struct virtio_crypto_alg_chain_data_vlf
+\end{itemize*}
+
+\field{sym_para_len} is the size of the specific structure used.
+
+Stateless mode CIPHER service requests are as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_cipher_data_flf_stateless {
+ struct {
+ /* See VIRTIO_CRYPTO_CIPHER* above */
+ le32 algo;
+ /* length of key */
+ le32 keylen;
+
+ /* See VIRTIO_CRYPTO_OP_* above */
+ le32 op;
+ } sess_para;
+
+ /*
+ * Byte Length of valid IV/Counter data pointed to by the below iv data.
+ */
+ le32 iv_len;
+ /* length of source data */
+ le32 src_data_len;
+ /* length of destination data */
+ le32 dst_data_len;
+};
+
+struct virtio_crypto_cipher_data_vlf_stateless {
+ /* Device read only portion */
+
+ /* The cipher key */
+ u8 cipher_key[keylen];
+
+ /* Initialization Vector or Counter data. */
+ u8 iv[iv_len];
+ /* Source data */
+ u8 src_data[src_data_len];
+
+ /* Device write only portion */
+ /* Destination data */
+ u8 dst_data[dst_data_len];
+};
+\end{lstlisting}
+
+Stateless mode requests of algorithm chaining are as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_alg_chain_data_flf_stateless {
+ struct {
+ /* See VIRTIO_CRYPTO_SYM_ALG_CHAIN_ORDER_* above */
+ le32 alg_chain_order;
+ /* length of the additional authenticated data in bytes */
+ le32 aad_len;
+
+ struct {
+ /* See VIRTIO_CRYPTO_CIPHER* above */
+ le32 algo;
+ /* length of key */
+ le32 keylen;
+ /* See VIRTIO_CRYPTO_OP_* above */
+ le32 op;
+ } cipher;
+
+ struct {
+ /* See VIRTIO_CRYPTO_HASH_* or VIRTIO_CRYPTO_MAC_* above */
+ le32 algo;
+ /* length of authenticated key */
+ le32 auth_key_len;
+ /* See VIRTIO_CRYPTO_SYM_HASH_MODE_* above */
+ le32 hash_mode;
+ } hash;
+ } sess_para;
+
+ le32 iv_len;
+ /* Length of source data */
+ le32 src_data_len;
+ /* Length of destination data */
+ le32 dst_data_len;
+ /* Starting point for cipher processing in source data */
+ le32 cipher_start_src_offset;
+ /* Length of the source data that the cipher will be computed on */
+ le32 len_to_cipher;
+ /* Starting point for hash processing in source data */
+ le32 hash_start_src_offset;
+ /* Length of the source data that the hash will be computed on */
+ le32 len_to_hash;
+ /* Length of the additional auth data */
+ le32 aad_len;
+ /* Length of the hash result */
+ le32 hash_result_len;
+ le32 reserved;
+};
+
+struct virtio_crypto_alg_chain_data_vlf_stateless {
+ /* Device read only portion */
+
+ /* The cipher key */
+ u8 cipher_key[keylen];
+ /* The auth key */
+ u8 auth_key[auth_key_len];
+ /* Initialization Vector or Counter data */
+ u8 iv[iv_len];
+ /* Additional authenticated data if exists */
+ u8 aad[aad_len];
+ /* Source data */
+ u8 src_data[src_data_len];
+
+ /* Device write only portion */
+
+ /* Destination data */
+ u8 dst_data[dst_data_len];
+ /* Hash result data */
+ u8 hash_result[hash_result_len];
+};
+\end{lstlisting}
+
+Stateless mode requests of symmetric algorithm are as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_sym_data_flf_stateless {
+ /* Device read only portion */
+#define VIRTIO_CRYPTO_SYM_DATE_REQ_HDR_STATELESS_SIZE 72
+ u8 op_type_flf[VIRTIO_CRYPTO_SYM_DATE_REQ_HDR_STATELESS_SIZE];
+
+ /* Device write only portion */
+ /* See above VIRTIO_CRYPTO_SYM_OP_* */
+ le32 op_type;
+};
+
+struct virtio_crypto_sym_data_vlf_stateless {
+ u8 op_type_vlf[sym_para_len];
+};
+\end{lstlisting}
+
+\field{op_type_flf} is the \field{op_type} specific header, it MUST starts
+with or be one of the following structures:
+\begin{itemize*}
+\item struct virtio_crypto_cipher_data_flf_stateless
+\item struct virtio_crypto_alg_chain_data_flf_stateless
+\end{itemize*}
+
+The length of \field{op_type_flf} is fixed to 72 bytes, the data of unused
+part (if has) will be ingored.
+
+\field{op_type_vlf} is the \field{op_type} specific parameters, it MUST starts
+with or be one of the following structures:
+\begin{itemize*}
+\item struct virtio_crypto_cipher_data_vlf_stateless
+\item struct virtio_crypto_alg_chain_data_vlf_stateless
+\end{itemize*}
+
+\field{sym_para_len} is the size of the specific structure used.
+
+\drivernormative{\paragraph}{Symmetric algorithms Operation}{Device Types / Crypto Device / Device Operation / Symmetric algorithms Operation}
+
+\begin{itemize*}
+\item If the driver uses the session mode, then the driver MUST set \field{session_id}
+ in struct virtio_crypto_op_header to a valid value assigned by the device when the
+ session was created.
+\item If the VIRTIO_CRYPTO_F_CIPHER_STATELESS_MODE feature bit is negotiated, 1) if the
+ driver uses the stateless mode, then the driver MUST set the \field{flag} field in
+ struct virtio_crypto_op_header to ZERO and MUST set the fields in struct
+ virtio_crypto_cipher_data_flf_stateless.sess_para or struct
+ virtio_crypto_alg_chain_data_flf_stateless.sess_para, 2) if the driver uses the
+ session mode, then the driver MUST set the \field{flag} field in struct
+ virtio_crypto_op_header to VIRTIO_CRYPTO_FLAG_SESSION_MODE.
+\item The driver MUST set the \field{opcode} field in struct virtio_crypto_op_header
+ to VIRTIO_CRYPTO_CIPHER_ENCRYPT or VIRTIO_CRYPTO_CIPHER_DECRYPT.
+\item The driver MUST specify the fields of struct virtio_crypto_cipher_data_flf in
+ struct virtio_crypto_sym_data_flf and struct virtio_crypto_cipher_data_vlf in
+ struct virtio_crypto_sym_data_vlf if the request is based on VIRTIO_CRYPTO_SYM_OP_CIPHER.
+\item The driver MUST specify the fields of struct virtio_crypto_alg_chain_data_flf
+ in struct virtio_crypto_sym_data_flf and struct virtio_crypto_alg_chain_data_vlf
+ in struct virtio_crypto_sym_data_vlf if the request is of the VIRTIO_CRYPTO_SYM_OP_ALGORITHM_CHAINING
+ type.
+\end{itemize*}
+
+\devicenormative{\paragraph}{Symmetric algorithms Operation}{Device Types / Crypto Device / Device Operation / Symmetric algorithms Operation}
+
+\begin{itemize*}
+\item If the VIRTIO_CRYPTO_F_CIPHER_STATELESS_MODE feature bit is negotiated, the device
+ MUST parse \field{flag} field in struct virtio_crypto_op_header in order to decide
+ which mode the driver uses.
+\item The device MUST parse the virtio_crypto_sym_data_req based on the \field{opcode}
+ field in general header.
+\item The device MUST parse the fields of struct virtio_crypto_cipher_data_flf in
+ struct virtio_crypto_sym_data_flf and struct virtio_crypto_cipher_data_vlf in
+ struct virtio_crypto_sym_data_vlf if the request is based on VIRTIO_CRYPTO_SYM_OP_CIPHER.
+\item The device MUST parse the fields of struct virtio_crypto_alg_chain_data_flf
+ in struct virtio_crypto_sym_data_flf and struct virtio_crypto_alg_chain_data_vlf
+ in struct virtio_crypto_sym_data_vlf if the request is of the VIRTIO_CRYPTO_SYM_OP_ALGORITHM_CHAINING
+ type.
+\item The device MUST copy the result of cryptographic operation in the dst_data[] in
+ both plain CIPHER mode and algorithms chain mode.
+\item The device MUST check the \field{para}.\field{add_len} is bigger than 0 before
+ parse the additional authenticated data in plain algorithms chain mode.
+\item The device MUST copy the result of HASH/MAC operation in the hash_result[] is
+ of the VIRTIO_CRYPTO_SYM_OP_ALGORITHM_CHAINING type.
+\item The device MUST set the \field{status} field in struct virtio_crypto_inhdr to
+ one of the following values of enum VIRTIO_CRYPTO_STATUS:
+\begin{itemize*}
+\item VIRTIO_CRYPTO_OK if the operation success.
+\item VIRTIO_CRYPTO_NOTSUPP if the requested algorithm or operation is unsupported.
+\item VIRTIO_CRYPTO_INVSESS if the session ID is invalid in session mode.
+\item VIRTIO_CRYPTO_ERR if failure not mentioned above occurs.
+\end{itemize*}
+\end{itemize*}
+
+\subsubsection{AEAD Service Operation}\label{sec:Device Types / Crypto Device / Device Operation / AEAD Service Operation}
+
+Session mode requests of symmetric algorithm are as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_aead_data_flf {
+ /*
+ * Byte Length of valid IV data.
+ *
+ * For GCM mode, this is either 12 (for 96-bit IVs) or 16, in which
+ * case iv points to J0.
+ * For CCM mode, this is the length of the nonce, which can be in the
+ * range 7 to 13 inclusive.
+ */
+ le32 iv_len;
+ /* length of additional auth data */
+ le32 aad_len;
+ /* length of source data */
+ le32 src_data_len;
+ /* length of dst data, this should be at least src_data_len + tag_len */
+ le32 dst_data_len;
+ /* Authentication tag length */
+ le32 tag_len;
+ le32 reserved;
+};
+
+struct virtio_crypto_aead_data_vlf {
+ /* Device read only portion */
+
+ /*
+ * Initialization Vector data.
+ *
+ * For GCM mode, this is either the IV (if the length is 96 bits) or J0
+ * (for other sizes), where J0 is as defined by NIST SP800-38D.
+ * Regardless of the IV length, a full 16 bytes needs to be allocated.
+ * For CCM mode, the first byte is reserved, and the nonce should be
+ * written starting at &iv[1] (to allow space for the implementation
+ * to write in the flags in the first byte). Note that a full 16 bytes
+ * should be allocated, even though the iv_len field will have
+ * a value less than this.
+ *
+ * The IV will be updated after every partial cryptographic operation.
+ */
+ u8 iv[iv_len];
+ /* Source data */
+ u8 src_data[src_data_len];
+ /* Additional authenticated data if exists */
+ u8 aad[aad_len];
+
+ /* Device write only portion */
+ /* Pointer to output data */
+ u8 dst_data[dst_data_len];
+};
+\end{lstlisting}
+
+Each request uses the virtio_crypto_aead_data_flf structure and the
+virtio_crypto_aead_data_flf structure to store information used to run the
+AEAD operations.
+
+Stateless mode AEAD service requests are as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_aead_data_flf_stateless {
+ struct {
+ /* See VIRTIO_CRYPTO_AEAD_* above */
+ le32 algo;
+ /* length of key */
+ le32 key_len;
+ /* encrypt or decrypt, See above VIRTIO_CRYPTO_OP_* */
+ le32 op;
+ } sess_para;
+
+ /* Byte Length of valid IV data. */
+ le32 iv_len;
+ /* Authentication tag length */
+ le32 tag_len;
+ /* length of additional auth data */
+ le32 aad_len;
+ /* length of source data */
+ le32 src_data_len;
+ /* length of dst data, this should be at least src_data_len + tag_len */
+ le32 dst_data_len;
+};
+
+struct virtio_crypto_aead_data_vlf_stateless {
+ /* Device read only portion */
+
+ /* The cipher key */
+ u8 key[key_len];
+ /* Initialization Vector data. */
+ u8 iv[iv_len];
+ /* Source data */
+ u8 src_data[src_data_len];
+ /* Additional authenticated data if exists */
+ u8 aad[aad_len];
+
+ /* Device write only portion */
+ /* Pointer to output data */
+ u8 dst_data[dst_data_len];
+};
+\end{lstlisting}
+
+\drivernormative{\paragraph}{AEAD Service Operation}{Device Types / Crypto Device / Device Operation / AEAD Service Operation}
+
+\begin{itemize*}
+\item If the driver uses the session mode, then the driver MUST set
+ \field{session_id} in struct virtio_crypto_op_header to a valid value assigned
+ by the device when the session was created.
+\item If the VIRTIO_CRYPTO_F_AEAD_STATELESS_MODE feature bit is negotiated, 1) if
+ the driver uses the stateless mode, then the driver MUST set the \field{flag}
+ field in struct virtio_crypto_op_header to ZERO and MUST set the fields in
+ struct virtio_crypto_aead_data_flf_stateless.sess_para, 2) if the driver uses
+ the session mode, then the driver MUST set the \field{flag} field in struct
+ virtio_crypto_op_header to VIRTIO_CRYPTO_FLAG_SESSION_MODE.
+\item The driver MUST set the \field{opcode} field in struct virtio_crypto_op_header
+ to VIRTIO_CRYPTO_AEAD_ENCRYPT or VIRTIO_CRYPTO_AEAD_DECRYPT.
+\end{itemize*}
+
+\devicenormative{\paragraph}{AEAD Service Operation}{Device Types / Crypto Device / Device Operation / AEAD Service Operation}
+
+\begin{itemize*}
+\item If the VIRTIO_CRYPTO_F_AEAD_STATELESS_MODE feature bit is negotiated, the
+ device MUST parse the virtio_crypto_aead_data_vlf_stateless based on the \field{opcode}
+ field in general header.
+\item The device MUST copy the result of cryptographic operation in the dst_data[].
+\item The device MUST copy the authentication tag in the dst_data[] offset the cipher result.
+\item The device MUST set the \field{status} field in struct virtio_crypto_inhdr to
+ one of the following values of enum VIRTIO_CRYPTO_STATUS:
+\item When the \field{opcode} field is VIRTIO_CRYPTO_AEAD_DECRYPT, the device MUST
+ verify and return the verification result to the driver.
+\begin{itemize*}
+\item VIRTIO_CRYPTO_OK if the operation success.
+\item VIRTIO_CRYPTO_NOTSUPP if the requested algorithm or operation is unsupported.
+\item VIRTIO_CRYPTO_BADMSG if the verification result is incorrect.
+\item VIRTIO_CRYPTO_INVSESS if the session ID invalid when in session mode.
+\item VIRTIO_CRYPTO_ERR if any failure not mentioned above occurs.
+\end{itemize*}
+\end{itemize*}
--
1.8.3.1
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