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crypto: caam - add support for ctr(aes)

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Add support for AES working in Counter Mode

Signed-off-by: Catalin Vasile <catalin.vasile@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Catalin Vasile 2014-10-31 12:45:35 +02:00 committed by Herbert Xu
parent 5d0429a30f
commit 2b22f6c547
2 changed files with 37 additions and 5 deletions
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40
drivers/crypto/caam/caamalg.c
View File

@ -1740,11 +1740,21 @@ static int ablkcipher_setkey(struct crypto_ablkcipher *ablkcipher,
int ret = 0;
u32 *key_jump_cmd;
u32 *desc;
u32 ctx1_iv_off = 0;
const bool ctr_mode = ((ctx->class1_alg_type & OP_ALG_AAI_MASK) ==
OP_ALG_AAI_CTR_MOD128);
#ifdef DEBUG
print_hex_dump(KERN_ERR, "key in @"__stringify(__LINE__)": ",
DUMP_PREFIX_ADDRESS, 16, 4, key, keylen, 1);
#endif
/*
* AES-CTR needs to load IV in CONTEXT1 reg
* at an offset of 128bits (16bytes)
* CONTEXT1[255:128] = IV
*/
if (ctr_mode)
ctx1_iv_off = 16;
memcpy(ctx->key, key, keylen);
ctx->key_dma = dma_map_single(jrdev, ctx->key, keylen,
@ -1770,8 +1780,8 @@ static int ablkcipher_setkey(struct crypto_ablkcipher *ablkcipher,
set_jump_tgt_here(desc, key_jump_cmd);
/* Load iv */
append_cmd(desc, CMD_SEQ_LOAD | LDST_SRCDST_BYTE_CONTEXT |
LDST_CLASS_1_CCB | tfm->ivsize);
append_seq_load(desc, tfm->ivsize, LDST_SRCDST_BYTE_CONTEXT |
LDST_CLASS_1_CCB | (ctx1_iv_off << LDST_OFFSET_SHIFT));
/* Load operation */
append_operation(desc, ctx->class1_alg_type |
@ -1809,11 +1819,15 @@ static int ablkcipher_setkey(struct crypto_ablkcipher *ablkcipher,
set_jump_tgt_here(desc, key_jump_cmd);
/* load IV */
append_cmd(desc, CMD_SEQ_LOAD | LDST_SRCDST_BYTE_CONTEXT |
LDST_CLASS_1_CCB | tfm->ivsize);
append_seq_load(desc, tfm->ivsize, LDST_SRCDST_BYTE_CONTEXT |
LDST_CLASS_1_CCB | (ctx1_iv_off << LDST_OFFSET_SHIFT));
/* Choose operation */
append_dec_op1(desc, ctx->class1_alg_type);
if (ctr_mode)
append_operation(desc, ctx->class1_alg_type |
OP_ALG_AS_INITFINAL | OP_ALG_DECRYPT);
else
append_dec_op1(desc, ctx->class1_alg_type);
/* Perform operation */
ablkcipher_append_src_dst(desc);
@ -3533,6 +3547,22 @@ static struct caam_alg_template driver_algs[] = {
.ivsize = DES_BLOCK_SIZE,
},
.class1_alg_type = OP_ALG_ALGSEL_DES | OP_ALG_AAI_CBC,
},
{
.name = "ctr(aes)",
.driver_name = "ctr-aes-caam",
.blocksize = 1,
.type = CRYPTO_ALG_TYPE_ABLKCIPHER,
.template_ablkcipher = {
.setkey = ablkcipher_setkey,
.encrypt = ablkcipher_encrypt,
.decrypt = ablkcipher_decrypt,
.geniv = "chainiv",
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
},
.class1_alg_type = OP_ALG_ALGSEL_AES | OP_ALG_AAI_CTR_MOD128,
}
};

2
drivers/crypto/caam/desc_constr.h
View File

@ -192,6 +192,8 @@ static inline void append_##cmd(u32 *desc, unsigned int len, u32 options) \
PRINT_POS; \
append_cmd(desc, CMD_##op | len | options); \
}
APPEND_CMD_LEN(seq_load, SEQ_LOAD)
APPEND_CMD_LEN(seq_store, SEQ_STORE)
APPEND_CMD_LEN(seq_fifo_load, SEQ_FIFO_LOAD)
APPEND_CMD_LEN(seq_fifo_store, SEQ_FIFO_STORE)