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crypto: picoxcell - Forbid 2-key 3DES in FIPS mode

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This patch forbids the use of 2-key 3DES (K1 == K3) in FIPS mode.

It also removes an unnecessary key length checks that are already
performed by the crypto API.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2019-04-11 16:51:15 +08:00
parent 7f88c4d725
commit aa113da291
1 changed files with 26 additions and 7 deletions
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33
drivers/crypto/picoxcell_crypto.c
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@ -753,11 +753,6 @@ static int spacc_des_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
struct spacc_ablk_ctx *ctx = crypto_tfm_ctx(tfm);
u32 tmp[DES_EXPKEY_WORDS];
if (len > DES3_EDE_KEY_SIZE) {
crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
if (unlikely(!des_ekey(tmp, key)) &&
(crypto_ablkcipher_get_flags(cipher) &
CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
@ -771,6 +766,30 @@ static int spacc_des_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
return 0;
}
/*
* Set the 3DES key for a block cipher transform. This also performs weak key
* checking if the transform has requested it.
*/
static int spacc_des3_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
unsigned int len)
{
struct spacc_ablk_ctx *ctx = crypto_ablkcipher_ctx(cipher);
u32 flags;
int err;
flags = crypto_ablkcipher_get_flags(cipher);
err = __des3_verify_key(&flags, key);
if (unlikely(err)) {
crypto_ablkcipher_set_flags(cipher, flags);
return err;
}
memcpy(ctx->key, key, len);
ctx->key_len = len;
return 0;
}
/*
* Set the key for an AES block cipher. Some key lengths are not supported in
* hardware so this must also check whether a fallback is needed.
@ -1353,7 +1372,7 @@ static struct spacc_alg ipsec_engine_algs[] = {
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_ablkcipher = {
.setkey = spacc_des_setkey,
.setkey = spacc_des3_setkey,
.encrypt = spacc_ablk_encrypt,
.decrypt = spacc_ablk_decrypt,
.min_keysize = DES3_EDE_KEY_SIZE,
@ -1380,7 +1399,7 @@ static struct spacc_alg ipsec_engine_algs[] = {
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_ablkcipher = {
.setkey = spacc_des_setkey,
.setkey = spacc_des3_setkey,
.encrypt = spacc_ablk_encrypt,
.decrypt = spacc_ablk_decrypt,
.min_keysize = DES3_EDE_KEY_SIZE,