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| author | Catalin Vasile <catalin.vasile@freescale.com> | 2014-10-31 12:45:35 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2014-11-06 23:15:04 +0800 |
| commit | 2b22f6c547f90e1a41e3f39ad8d569e3efc74d42 (patch) | |
| tree | 8dd1cf11a1a5069f4e3eb3df38e4af40c6f63835 /drivers/crypto/caam/caamalg.c | |
| parent | 5d0429a30f06845af78a696de59e3e8d21252846 (diff) | |
| download | lwn-2b22f6c547f90e1a41e3f39ad8d569e3efc74d42.tar.gz lwn-2b22f6c547f90e1a41e3f39ad8d569e3efc74d42.zip | |
crypto: caam - add support for ctr(aes)
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>
Diffstat (limited to 'drivers/crypto/caam/caamalg.c')
| -rw-r--r-- | drivers/crypto/caam/caamalg.c | 40 |
1 files changed, 35 insertions, 5 deletions
diff --git a/drivers/crypto/caam/caamalg.c b/drivers/crypto/caam/caamalg.c index 48df0520ed46..2dc85f8304bb 100644 --- a/drivers/crypto/caam/caamalg.c +++ b/drivers/crypto/caam/caamalg.c @@ -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, } }; |