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crypto: amcc - switch to AES library for GCM key derivation 

The AMCC code for GCM key derivation allocates a AES cipher to
perform a single block encryption. So let's switch to the new
and more lightweight AES library instead.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel 2019-07-02 21:41:42 +02:00 committed by Herbert Xu
parent 28a220aac5
commit da3e7a9715
2 changed files with 9 additions and 17 deletions
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2
drivers/crypto/Kconfig
View File

@ -312,7 +312,7 @@ config CRYPTO_DEV_PPC4XX
depends on PPC && 4xx
select CRYPTO_HASH
select CRYPTO_AEAD
select CRYPTO_AES
select CRYPTO_LIB_AES
select CRYPTO_CCM
select CRYPTO_CTR
select CRYPTO_GCM

24
drivers/crypto/amcc/crypto4xx_alg.c
View File

@ -527,28 +527,20 @@ static int crypto4xx_aes_gcm_validate_keylen(unsigned int keylen)
static int crypto4xx_compute_gcm_hash_key_sw(__le32 *hash_start, const u8 *key,
unsigned int keylen)
{
struct crypto_cipher *aes_tfm = NULL;
struct crypto_aes_ctx ctx;
uint8_t src[16] = { 0 };
int rc = 0;
int rc;
aes_tfm = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(aes_tfm)) {
rc = PTR_ERR(aes_tfm);
pr_warn("could not load aes cipher driver: %d\n", rc);
rc = aes_expandkey(&ctx, key, keylen);
if (rc) {
pr_err("aes_expandkey() failed: %d\n", rc);
return rc;
}
rc = crypto_cipher_setkey(aes_tfm, key, keylen);
if (rc) {
pr_err("setkey() failed: %d\n", rc);
goto out;
}
crypto_cipher_encrypt_one(aes_tfm, src, src);
aes_encrypt(&ctx, src, src);
crypto4xx_memcpy_to_le32(hash_start, src, 16);
out:
crypto_free_cipher(aes_tfm);
return rc;
memzero_explicit(&ctx, sizeof(ctx));
return 0;
}
int crypto4xx_setkey_aes_gcm(struct crypto_aead *cipher,