diff options
Diffstat (limited to 'arch/x86/crypto')
| -rw-r--r-- | arch/x86/crypto/aesni-intel_glue.c | 26 |
1 files changed, 8 insertions, 18 deletions
diff --git a/arch/x86/crypto/aesni-intel_glue.c b/arch/x86/crypto/aesni-intel_glue.c index 02a4c0c276df..5b25d2a58aeb 100644 --- a/arch/x86/crypto/aesni-intel_glue.c +++ b/arch/x86/crypto/aesni-intel_glue.c @@ -40,7 +40,6 @@ #define AESNI_ALIGN 16 #define AESNI_ALIGN_ATTR __attribute__ ((__aligned__(AESNI_ALIGN))) #define AES_BLOCK_MASK (~(AES_BLOCK_SIZE - 1)) -#define RFC4106_HASH_SUBKEY_SIZE 16 #define AESNI_ALIGN_EXTRA ((AESNI_ALIGN - 1) & ~(CRYPTO_MINALIGN - 1)) #define CRYPTO_AES_CTX_SIZE (sizeof(struct crypto_aes_ctx) + AESNI_ALIGN_EXTRA) #define XTS_AES_CTX_SIZE (sizeof(struct aesni_xts_ctx) + AESNI_ALIGN_EXTRA) @@ -590,23 +589,12 @@ static int xctr_crypt(struct skcipher_request *req) return err; } -static int -rfc4106_set_hash_subkey(u8 *hash_subkey, const u8 *key, unsigned int key_len) +static int aes_gcm_derive_hash_subkey(const struct crypto_aes_ctx *aes_key, + u8 hash_subkey[AES_BLOCK_SIZE]) { - struct crypto_aes_ctx ctx; - int ret; + static const u8 zeroes[AES_BLOCK_SIZE]; - ret = aes_expandkey(&ctx, key, key_len); - if (ret) - return ret; - - /* Clear the data in the hash sub key container to zero.*/ - /* We want to cipher all zeros to create the hash sub key. */ - memset(hash_subkey, 0, RFC4106_HASH_SUBKEY_SIZE); - - aes_encrypt(&ctx, hash_subkey, hash_subkey); - - memzero_explicit(&ctx, sizeof(ctx)); + aes_encrypt(aes_key, hash_subkey, zeroes); return 0; } @@ -624,7 +612,8 @@ static int common_rfc4106_set_key(struct crypto_aead *aead, const u8 *key, memcpy(ctx->nonce, key + key_len, sizeof(ctx->nonce)); return aes_set_key_common(&ctx->aes_key_expanded, key, key_len) ?: - rfc4106_set_hash_subkey(ctx->hash_subkey, key, key_len); + aes_gcm_derive_hash_subkey(&ctx->aes_key_expanded, + ctx->hash_subkey); } /* This is the Integrity Check Value (aka the authentication tag) length and can @@ -1327,7 +1316,8 @@ static int generic_gcmaes_set_key(struct crypto_aead *aead, const u8 *key, struct generic_gcmaes_ctx *ctx = generic_gcmaes_ctx_get(aead); return aes_set_key_common(&ctx->aes_key_expanded, key, key_len) ?: - rfc4106_set_hash_subkey(ctx->hash_subkey, key, key_len); + aes_gcm_derive_hash_subkey(&ctx->aes_key_expanded, + ctx->hash_subkey); } static int generic_gcmaes_encrypt(struct aead_request *req) |