273 lines
7.4 KiB
C
273 lines
7.4 KiB
C
/*
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* The device /dev/cryptocop is accessible using this driver using
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* CRYPTOCOP_MAJOR (254) and minor number 0.
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*/
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#ifndef CRYPTOCOP_H
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#define CRYPTOCOP_H
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#include <linux/uio.h>
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#define CRYPTOCOP_SESSION_ID_NONE (0)
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typedef unsigned long long int cryptocop_session_id;
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/* cryptocop ioctls */
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#define ETRAXCRYPTOCOP_IOCTYPE (250)
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#define CRYPTOCOP_IO_CREATE_SESSION _IOWR(ETRAXCRYPTOCOP_IOCTYPE, 1, struct strcop_session_op)
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#define CRYPTOCOP_IO_CLOSE_SESSION _IOW(ETRAXCRYPTOCOP_IOCTYPE, 2, struct strcop_session_op)
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#define CRYPTOCOP_IO_PROCESS_OP _IOWR(ETRAXCRYPTOCOP_IOCTYPE, 3, struct strcop_crypto_op)
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#define CRYPTOCOP_IO_MAXNR (3)
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typedef enum {
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cryptocop_cipher_des = 0,
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cryptocop_cipher_3des = 1,
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cryptocop_cipher_aes = 2,
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cryptocop_cipher_m2m = 3, /* mem2mem is essentially a NULL cipher with blocklength=1 */
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cryptocop_cipher_none
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} cryptocop_cipher_type;
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typedef enum {
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cryptocop_digest_sha1 = 0,
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cryptocop_digest_md5 = 1,
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cryptocop_digest_none
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} cryptocop_digest_type;
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typedef enum {
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cryptocop_csum_le = 0,
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cryptocop_csum_be = 1,
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cryptocop_csum_none
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} cryptocop_csum_type;
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typedef enum {
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cryptocop_cipher_mode_ecb = 0,
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cryptocop_cipher_mode_cbc,
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cryptocop_cipher_mode_none
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} cryptocop_cipher_mode;
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typedef enum {
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cryptocop_3des_eee = 0,
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cryptocop_3des_eed = 1,
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cryptocop_3des_ede = 2,
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cryptocop_3des_edd = 3,
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cryptocop_3des_dee = 4,
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cryptocop_3des_ded = 5,
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cryptocop_3des_dde = 6,
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cryptocop_3des_ddd = 7
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} cryptocop_3des_mode;
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/* Usermode accessible (ioctl) operations. */
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struct strcop_session_op{
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cryptocop_session_id ses_id;
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cryptocop_cipher_type cipher; /* AES, DES, 3DES, m2m, none */
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cryptocop_cipher_mode cmode; /* ECB, CBC, none */
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cryptocop_3des_mode des3_mode;
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cryptocop_digest_type digest; /* MD5, SHA1, none */
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cryptocop_csum_type csum; /* BE, LE, none */
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unsigned char *key;
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size_t keylen;
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};
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#define CRYPTOCOP_CSUM_LENGTH (2)
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#define CRYPTOCOP_MAX_DIGEST_LENGTH (20) /* SHA-1 20, MD5 16 */
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#define CRYPTOCOP_MAX_IV_LENGTH (16) /* (3)DES==8, AES == 16 */
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#define CRYPTOCOP_MAX_KEY_LENGTH (32)
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struct strcop_crypto_op{
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cryptocop_session_id ses_id;
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/* Indata. */
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unsigned char *indata;
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size_t inlen; /* Total indata length. */
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/* Cipher configuration. */
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unsigned char do_cipher:1;
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unsigned char decrypt:1; /* 1 == decrypt, 0 == encrypt */
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unsigned char cipher_explicit:1;
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size_t cipher_start;
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size_t cipher_len;
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/* cipher_iv is used if do_cipher and cipher_explicit and the cipher
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mode is CBC. The length is controlled by the type of cipher,
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e.g. DES/3DES 8 octets and AES 16 octets. */
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unsigned char cipher_iv[CRYPTOCOP_MAX_IV_LENGTH];
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/* Outdata. */
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unsigned char *cipher_outdata;
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size_t cipher_outlen;
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/* digest configuration. */
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unsigned char do_digest:1;
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size_t digest_start;
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size_t digest_len;
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/* Outdata. The actual length is determined by the type of the digest. */
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unsigned char digest[CRYPTOCOP_MAX_DIGEST_LENGTH];
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/* Checksum configuration. */
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unsigned char do_csum:1;
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size_t csum_start;
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size_t csum_len;
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/* Outdata. */
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unsigned char csum[CRYPTOCOP_CSUM_LENGTH];
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};
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#ifdef __KERNEL__
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/********** The API to use from inside the kernel. ************/
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#include <asm/arch/hwregs/dma.h>
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typedef enum {
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cryptocop_alg_csum = 0,
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cryptocop_alg_mem2mem,
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cryptocop_alg_md5,
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cryptocop_alg_sha1,
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cryptocop_alg_des,
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cryptocop_alg_3des,
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cryptocop_alg_aes,
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cryptocop_no_alg,
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} cryptocop_algorithm;
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typedef u8 cryptocop_tfrm_id;
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struct cryptocop_operation;
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typedef void (cryptocop_callback)(struct cryptocop_operation*, void*);
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struct cryptocop_transform_init {
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cryptocop_algorithm alg;
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/* Keydata for ciphers. */
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unsigned char key[CRYPTOCOP_MAX_KEY_LENGTH];
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unsigned int keylen;
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cryptocop_cipher_mode cipher_mode;
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cryptocop_3des_mode tdes_mode;
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cryptocop_csum_type csum_mode; /* cryptocop_csum_none is not allowed when alg==cryptocop_alg_csum */
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cryptocop_tfrm_id tid; /* Locally unique in session; assigned by user, checked by driver. */
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struct cryptocop_transform_init *next;
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};
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typedef enum {
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cryptocop_source_dma = 0,
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cryptocop_source_des,
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cryptocop_source_3des,
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cryptocop_source_aes,
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cryptocop_source_md5,
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cryptocop_source_sha1,
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cryptocop_source_csum,
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cryptocop_source_none,
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} cryptocop_source;
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struct cryptocop_desc_cfg {
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cryptocop_tfrm_id tid;
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cryptocop_source src;
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unsigned int last:1; /* Last use of this transform in the operation. Will push outdata when encountered. */
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struct cryptocop_desc_cfg *next;
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};
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struct cryptocop_desc {
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size_t length;
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struct cryptocop_desc_cfg *cfg;
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struct cryptocop_desc *next;
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};
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/* Flags for cryptocop_tfrm_cfg */
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#define CRYPTOCOP_NO_FLAG (0x00)
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#define CRYPTOCOP_ENCRYPT (0x01)
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#define CRYPTOCOP_DECRYPT (0x02)
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#define CRYPTOCOP_EXPLICIT_IV (0x04)
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struct cryptocop_tfrm_cfg {
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cryptocop_tfrm_id tid;
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unsigned int flags; /* DECRYPT, ENCRYPT, EXPLICIT_IV */
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/* CBC initialisation vector for cihers. */
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u8 iv[CRYPTOCOP_MAX_IV_LENGTH];
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/* The position in output where to write the transform output. The order
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in which the driver writes the output is unspecified, hence if several
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transforms write on the same positions in the output the result is
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unspecified. */
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size_t inject_ix;
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struct cryptocop_tfrm_cfg *next;
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};
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struct cryptocop_dma_list_operation{
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/* The consumer can provide DMA lists to send to the co-processor. 'use_dmalists' in
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struct cryptocop_operation must be set for the driver to use them. outlist,
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out_data_buf, inlist and in_data_buf must all be physical addresses since they will
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be loaded to DMA . */
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dma_descr_data *outlist; /* Out from memory to the co-processor. */
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char *out_data_buf;
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dma_descr_data *inlist; /* In from the co-processor to memory. */
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char *in_data_buf;
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cryptocop_3des_mode tdes_mode;
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cryptocop_csum_type csum_mode;
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};
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struct cryptocop_tfrm_operation{
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/* Operation configuration, if not 'use_dmalists' is set. */
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struct cryptocop_tfrm_cfg *tfrm_cfg;
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struct cryptocop_desc *desc;
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struct iovec *indata;
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size_t incount;
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size_t inlen; /* Total inlength. */
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struct iovec *outdata;
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size_t outcount;
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size_t outlen; /* Total outlength. */
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};
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struct cryptocop_operation {
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cryptocop_callback *cb;
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void *cb_data;
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cryptocop_session_id sid;
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/* The status of the operation when returned to consumer. */
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int operation_status; /* 0, -EAGAIN */
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/* Flags */
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unsigned int use_dmalists:1; /* Use outlist and inlist instead of the desc/tfrm_cfg configuration. */
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unsigned int in_interrupt:1; /* Set if inserting job from interrupt context. */
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unsigned int fast_callback:1; /* Set if fast callback wanted, i.e. from interrupt context. */
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union{
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struct cryptocop_dma_list_operation list_op;
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struct cryptocop_tfrm_operation tfrm_op;
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};
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};
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int cryptocop_new_session(cryptocop_session_id *sid, struct cryptocop_transform_init *tinit, int alloc_flag);
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int cryptocop_free_session(cryptocop_session_id sid);
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int cryptocop_job_queue_insert_csum(struct cryptocop_operation *operation);
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int cryptocop_job_queue_insert_crypto(struct cryptocop_operation *operation);
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int cryptocop_job_queue_insert_user_job(struct cryptocop_operation *operation);
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#endif /* __KERNEL__ */
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#endif /* CRYPTOCOP_H */
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