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| author | Iuliana Prodan <iuliana.prodan@nxp.com> | 2019-07-31 15:05:55 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2019-08-09 07:11:43 +0200 |
| commit | bc67d04e75260942fb534fb91673103dcad7ca96 (patch) | |
| tree | 7a32f21ca3a91c5eddf22fa8a06ac13f1ecad681 | |
| parent | crypto: gcm - helper functions for assoclen/authsize check (diff) | |
| download | linux-bc67d04e75260942fb534fb91673103dcad7ca96.tar.xz linux-bc67d04e75260942fb534fb91673103dcad7ca96.zip | |
crypto: aes - helper function to validate key length for AES algorithms
Add inline helper function to check key length for AES algorithms.
The key can be 128, 192 or 256 bits size.
This function is used in the generic aes implementation.
Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
| -rw-r--r-- | include/crypto/aes.h | 17 | ||||
| -rw-r--r-- | lib/crypto/aes.c | 8 |
2 files changed, 21 insertions, 4 deletions
diff --git a/include/crypto/aes.h b/include/crypto/aes.h index 8e0f4cf948e5..2090729701ab 100644 --- a/include/crypto/aes.h +++ b/include/crypto/aes.h @@ -31,6 +31,23 @@ struct crypto_aes_ctx { extern const u32 crypto_ft_tab[4][256] ____cacheline_aligned; extern const u32 crypto_it_tab[4][256] ____cacheline_aligned; +/* + * validate key length for AES algorithms + */ +static inline int aes_check_keylen(unsigned int keylen) +{ + switch (keylen) { + case AES_KEYSIZE_128: + case AES_KEYSIZE_192: + case AES_KEYSIZE_256: + break; + default: + return -EINVAL; + } + + return 0; +} + int crypto_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, unsigned int key_len); diff --git a/lib/crypto/aes.c b/lib/crypto/aes.c index 4e100af38c51..827fe89922ff 100644 --- a/lib/crypto/aes.c +++ b/lib/crypto/aes.c @@ -187,11 +187,11 @@ int aes_expandkey(struct crypto_aes_ctx *ctx, const u8 *in_key, { u32 kwords = key_len / sizeof(u32); u32 rc, i, j; + int err; - if (key_len != AES_KEYSIZE_128 && - key_len != AES_KEYSIZE_192 && - key_len != AES_KEYSIZE_256) - return -EINVAL; + err = aes_check_keylen(key_len); + if (err) + return err; ctx->key_length = key_len; |