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crypto: inside-secure - Added support for the AES-CMAC ahash

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This patch adds support for the AES-CMAC authentication algorithm.

Signed-off-by: Pascal van Leeuwen <pvanleeuwen@verimatrix.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Pascal van Leeuwen 2019-09-09 13:13:08 +02:00 committed by Herbert Xu
parent 38f21b4bab
commit 7a627db9ca
3 changed files with 101 additions and 0 deletions
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1
drivers/crypto/inside-secure/safexcel.c
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@ -1172,6 +1172,7 @@ static struct safexcel_alg_template *safexcel_algs[] = {
&safexcel_alg_crc32,
&safexcel_alg_cbcmac,
&safexcel_alg_xcbcmac,
&safexcel_alg_cmac,
};
static int safexcel_register_algorithms(struct safexcel_crypto_priv *priv)

1
drivers/crypto/inside-secure/safexcel.h
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@ -857,5 +857,6 @@ extern struct safexcel_alg_template safexcel_alg_ccm;
extern struct safexcel_alg_template safexcel_alg_crc32;
extern struct safexcel_alg_template safexcel_alg_cbcmac;
extern struct safexcel_alg_template safexcel_alg_xcbcmac;
extern struct safexcel_alg_template safexcel_alg_cmac;
#endif

99
drivers/crypto/inside-secure/safexcel_hash.c
View File

@ -2122,3 +2122,102 @@ struct safexcel_alg_template safexcel_alg_xcbcmac = {
},
},
};
static int safexcel_cmac_setkey(struct crypto_ahash *tfm, const u8 *key,
unsigned int len)
{
struct safexcel_ahash_ctx *ctx = crypto_tfm_ctx(crypto_ahash_tfm(tfm));
struct crypto_aes_ctx aes;
__be64 consts[4];
u64 _const[2];
u8 msb_mask, gfmask;
int ret, i;
ret = aes_expandkey(&aes, key, len);
if (ret) {
crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
return ret;
}
for (i = 0; i < len / sizeof(u32); i++)
ctx->ipad[i + 8] = cpu_to_be32(aes.key_enc[i]);
/* precompute the CMAC key material */
crypto_cipher_clear_flags(ctx->kaes, CRYPTO_TFM_REQ_MASK);
crypto_cipher_set_flags(ctx->kaes, crypto_ahash_get_flags(tfm) &
CRYPTO_TFM_REQ_MASK);
ret = crypto_cipher_setkey(ctx->kaes, key, len);
crypto_ahash_set_flags(tfm, crypto_cipher_get_flags(ctx->kaes) &
CRYPTO_TFM_RES_MASK);
if (ret)
return ret;
/* code below borrowed from crypto/cmac.c */
/* encrypt the zero block */
memset(consts, 0, AES_BLOCK_SIZE);
crypto_cipher_encrypt_one(ctx->kaes, (u8 *)consts, (u8 *)consts);
gfmask = 0x87;
_const[0] = be64_to_cpu(consts[1]);
_const[1] = be64_to_cpu(consts[0]);
/* gf(2^128) multiply zero-ciphertext with u and u^2 */
for (i = 0; i < 4; i += 2) {
msb_mask = ((s64)_const[1] >> 63) & gfmask;
_const[1] = (_const[1] << 1) | (_const[0] >> 63);
_const[0] = (_const[0] << 1) ^ msb_mask;
consts[i + 0] = cpu_to_be64(_const[1]);
consts[i + 1] = cpu_to_be64(_const[0]);
}
/* end of code borrowed from crypto/cmac.c */
for (i = 0; i < 2 * AES_BLOCK_SIZE / sizeof(u32); i++)
ctx->ipad[i] = cpu_to_be32(((u32 *)consts)[i]);
if (len == AES_KEYSIZE_192) {
ctx->alg = CONTEXT_CONTROL_CRYPTO_ALG_XCBC192;
ctx->key_sz = AES_MAX_KEY_SIZE + 2 * AES_BLOCK_SIZE;
} else if (len == AES_KEYSIZE_256) {
ctx->alg = CONTEXT_CONTROL_CRYPTO_ALG_XCBC256;
ctx->key_sz = AES_MAX_KEY_SIZE + 2 * AES_BLOCK_SIZE;
} else {
ctx->alg = CONTEXT_CONTROL_CRYPTO_ALG_XCBC128;
ctx->key_sz = AES_MIN_KEY_SIZE + 2 * AES_BLOCK_SIZE;
}
ctx->cbcmac = false;
memzero_explicit(&aes, sizeof(aes));
return 0;
}
struct safexcel_alg_template safexcel_alg_cmac = {
.type = SAFEXCEL_ALG_TYPE_AHASH,
.algo_mask = 0,
.alg.ahash = {
.init = safexcel_cbcmac_init,
.update = safexcel_ahash_update,
.final = safexcel_ahash_final,
.finup = safexcel_ahash_finup,
.digest = safexcel_cbcmac_digest,
.setkey = safexcel_cmac_setkey,
.export = safexcel_ahash_export,
.import = safexcel_ahash_import,
.halg = {
.digestsize = AES_BLOCK_SIZE,
.statesize = sizeof(struct safexcel_ahash_export_state),
.base = {
.cra_name = "cmac(aes)",
.cra_driver_name = "safexcel-cmac-aes",
.cra_priority = SAFEXCEL_CRA_PRIORITY,
.cra_flags = CRYPTO_ALG_ASYNC |
CRYPTO_ALG_KERN_DRIVER_ONLY,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct safexcel_ahash_ctx),
.cra_init = safexcel_xcbcmac_cra_init,
.cra_exit = safexcel_xcbcmac_cra_exit,
.cra_module = THIS_MODULE,
},
},
},
};