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

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This patch adds support for SM4 in ECB mode, i.e. skcipher ecb(sm4).

changes since v1:
- make SAFEXCEL_SM4 case entry explit, using the proper SM4_BLOCK_SIZE
  instead of "borrowing" the AES code which "coincidentally" works

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 11:10:36 +02:00 committed by Herbert Xu
parent 8194fd1d71
commit fcca797d2a
3 changed files with 97 additions and 0 deletions
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1
drivers/crypto/inside-secure/safexcel.c
View File

@ -1178,6 +1178,7 @@ static struct safexcel_alg_template *safexcel_algs[] = {
&safexcel_alg_chachapoly_esp,
&safexcel_alg_sm3,
&safexcel_alg_hmac_sm3,
&safexcel_alg_ecb_sm4,
};
static int safexcel_register_algorithms(struct safexcel_crypto_priv *priv)

2
drivers/crypto/inside-secure/safexcel.h
View File

@ -359,6 +359,7 @@ struct safexcel_context_record {
#define CONTEXT_CONTROL_CRYPTO_ALG_AES192 (0x6 << 17)
#define CONTEXT_CONTROL_CRYPTO_ALG_AES256 (0x7 << 17)
#define CONTEXT_CONTROL_CRYPTO_ALG_CHACHA20 (0x8 << 17)
#define CONTEXT_CONTROL_CRYPTO_ALG_SM4 (0xd << 17)
#define CONTEXT_CONTROL_DIGEST_PRECOMPUTED (0x1 << 21)
#define CONTEXT_CONTROL_DIGEST_XCM (0x2 << 21)
#define CONTEXT_CONTROL_DIGEST_HMAC (0x3 << 21)
@ -878,5 +879,6 @@ extern struct safexcel_alg_template safexcel_alg_chachapoly;
extern struct safexcel_alg_template safexcel_alg_chachapoly_esp;
extern struct safexcel_alg_template safexcel_alg_sm3;
extern struct safexcel_alg_template safexcel_alg_hmac_sm3;
extern struct safexcel_alg_template safexcel_alg_ecb_sm4;
#endif

94
drivers/crypto/inside-secure/safexcel_cipher.c
View File

@ -19,6 +19,7 @@
#include <crypto/ghash.h>
#include <crypto/poly1305.h>
#include <crypto/sha.h>
#include <crypto/sm4.h>
#include <crypto/xts.h>
#include <crypto/skcipher.h>
#include <crypto/internal/aead.h>
@ -36,6 +37,7 @@ enum safexcel_cipher_alg {
SAFEXCEL_3DES,
SAFEXCEL_AES,
SAFEXCEL_CHACHA20,
SAFEXCEL_SM4,
};
struct safexcel_cipher_ctx {
@ -139,6 +141,10 @@ static void safexcel_cipher_token(struct safexcel_cipher_ctx *ctx, u8 *iv,
block_sz = DES3_EDE_BLOCK_SIZE;
cdesc->control_data.options |= EIP197_OPTION_2_TOKEN_IV_CMD;
break;
case SAFEXCEL_SM4:
block_sz = SM4_BLOCK_SIZE;
cdesc->control_data.options |= EIP197_OPTION_4_TOKEN_IV_CMD;
break;
case SAFEXCEL_AES:
block_sz = AES_BLOCK_SIZE;
cdesc->control_data.options |= EIP197_OPTION_4_TOKEN_IV_CMD;
@ -526,6 +532,9 @@ static int safexcel_context_control(struct safexcel_cipher_ctx *ctx,
} else if (ctx->alg == SAFEXCEL_CHACHA20) {
cdesc->control_data.control0 |=
CONTEXT_CONTROL_CRYPTO_ALG_CHACHA20;
} else if (ctx->alg == SAFEXCEL_SM4) {
cdesc->control_data.control0 |=
CONTEXT_CONTROL_CRYPTO_ALG_SM4;
}
return 0;
@ -2613,3 +2622,88 @@ struct safexcel_alg_template safexcel_alg_chachapoly_esp = {
},
},
};
static int safexcel_skcipher_sm4_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);
struct safexcel_crypto_priv *priv = ctx->priv;
int i;
if (len != SM4_KEY_SIZE) {
crypto_skcipher_set_flags(ctfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
if (priv->flags & EIP197_TRC_CACHE && ctx->base.ctxr_dma) {
for (i = 0; i < SM4_KEY_SIZE / sizeof(u32); i++) {
if (ctx->key[i] !=
get_unaligned_le32(key + i * sizeof(u32))) {
ctx->base.needs_inv = true;
break;
}
}
}
for (i = 0; i < SM4_KEY_SIZE / sizeof(u32); i++)
ctx->key[i] = get_unaligned_le32(key + i * sizeof(u32));
ctx->key_len = SM4_KEY_SIZE;
return 0;
}
static int safexcel_sm4_blk_encrypt(struct skcipher_request *req)
{
/* Workaround for HW bug: EIP96 4.3 does not report blocksize error */
if (req->cryptlen & (SM4_BLOCK_SIZE - 1))
return -EINVAL;
else
return safexcel_queue_req(&req->base, skcipher_request_ctx(req),
SAFEXCEL_ENCRYPT);
}
static int safexcel_sm4_blk_decrypt(struct skcipher_request *req)
{
/* Workaround for HW bug: EIP96 4.3 does not report blocksize error */
if (req->cryptlen & (SM4_BLOCK_SIZE - 1))
return -EINVAL;
else
return safexcel_queue_req(&req->base, skcipher_request_ctx(req),
SAFEXCEL_DECRYPT);
}
static int safexcel_skcipher_sm4_ecb_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_ECB;
return 0;
}
struct safexcel_alg_template safexcel_alg_ecb_sm4 = {
.type = SAFEXCEL_ALG_TYPE_SKCIPHER,
.algo_mask = SAFEXCEL_ALG_SM4,
.alg.skcipher = {
.setkey = safexcel_skcipher_sm4_setkey,
.encrypt = safexcel_sm4_blk_encrypt,
.decrypt = safexcel_sm4_blk_decrypt,
.min_keysize = SM4_KEY_SIZE,
.max_keysize = SM4_KEY_SIZE,
.base = {
.cra_name = "ecb(sm4)",
.cra_driver_name = "safexcel-ecb-sm4",
.cra_priority = SAFEXCEL_CRA_PRIORITY,
.cra_flags = CRYPTO_ALG_ASYNC |
CRYPTO_ALG_KERN_DRIVER_ONLY,
.cra_blocksize = SM4_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct safexcel_cipher_ctx),
.cra_alignmask = 0,
.cra_init = safexcel_skcipher_sm4_ecb_cra_init,
.cra_exit = safexcel_skcipher_cra_exit,
.cra_module = THIS_MODULE,
},
},
};