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crypto: inside-secure - Add support for the rfc3685(ctr(sm4)) skcipher 

This patch adds support for SM4 in (32 bit) CTR mode, i.e. skcipher
rfc3686(ctr(sm4)).

changes since v1:
- nothing

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 2019-09-13 11:10:41 +02:00 committed by Herbert Xu
parent 7468ab22d7
commit f77e5dc08a
3 changed files with 53 additions and 0 deletions
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1
drivers/crypto/inside-secure/safexcel.c
View File

@ -1182,6 +1182,7 @@ static struct safexcel_alg_template *safexcel_algs[] = {
&safexcel_alg_cbc_sm4,
&safexcel_alg_ofb_sm4,
&safexcel_alg_cfb_sm4,
&safexcel_alg_ctr_sm4,
};
static int safexcel_register_algorithms(struct safexcel_crypto_priv *priv)

1
drivers/crypto/inside-secure/safexcel.h
View File

@ -883,5 +883,6 @@ extern struct safexcel_alg_template safexcel_alg_ecb_sm4;
extern struct safexcel_alg_template safexcel_alg_cbc_sm4;
extern struct safexcel_alg_template safexcel_alg_ofb_sm4;
extern struct safexcel_alg_template safexcel_alg_cfb_sm4;
extern struct safexcel_alg_template safexcel_alg_ctr_sm4;
#endif

51
drivers/crypto/inside-secure/safexcel_cipher.c
View File

@ -2815,3 +2815,54 @@ struct safexcel_alg_template safexcel_alg_cfb_sm4 = {
},
},
};
static int safexcel_skcipher_sm4ctr_setkey(struct crypto_skcipher *ctfm,
const u8 *key, unsigned int len)
{
struct crypto_tfm *tfm = crypto_skcipher_tfm(ctfm);
struct safexcel_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
/* last 4 bytes of key are the nonce! */
ctx->nonce = *(u32 *)(key + len - CTR_RFC3686_NONCE_SIZE);
/* exclude the nonce here */
len -= CTR_RFC3686_NONCE_SIZE;
return safexcel_skcipher_sm4_setkey(ctfm, key, len);
}
static int safexcel_skcipher_sm4_ctr_cra_init(struct crypto_tfm *tfm)
{
struct safexcel_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
safexcel_skcipher_cra_init(tfm);
ctx->alg = SAFEXCEL_SM4;
ctx->mode = CONTEXT_CONTROL_CRYPTO_MODE_CTR_LOAD;
return 0;
}
struct safexcel_alg_template safexcel_alg_ctr_sm4 = {
.type = SAFEXCEL_ALG_TYPE_SKCIPHER,
.algo_mask = SAFEXCEL_ALG_SM4,
.alg.skcipher = {
.setkey = safexcel_skcipher_sm4ctr_setkey,
.encrypt = safexcel_encrypt,
.decrypt = safexcel_decrypt,
/* Add nonce size */
.min_keysize = SM4_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
.max_keysize = SM4_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
.ivsize = CTR_RFC3686_IV_SIZE,
.base = {
.cra_name = "rfc3686(ctr(sm4))",
.cra_driver_name = "safexcel-ctr-sm4",
.cra_priority = SAFEXCEL_CRA_PRIORITY,
.cra_flags = CRYPTO_ALG_ASYNC |
CRYPTO_ALG_KERN_DRIVER_ONLY,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct safexcel_cipher_ctx),
.cra_alignmask = 0,
.cra_init = safexcel_skcipher_sm4_ctr_cra_init,
.cra_exit = safexcel_skcipher_cra_exit,
.cra_module = THIS_MODULE,
},
},
};