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Change aes_set_gcm_key to be more flexible.

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Firstly, it was odd that AES-NI was a special case. Secondly, I have a
need coming up for being able to get the block function and not create a
GCM context.

Change-Id: Ie87de5e7ea42dc042d302c5eafecbc6af03c714b
Reviewed-on: https://boringssl-review.googlesource.com/3910
Reviewed-by: Adam Langley <agl@google.com>
This commit is contained in:
Adam Langley 2015-03-13 11:49:22 -07:00
parent 5edc4e2a9b
commit 52f9f62283
1 changed files with 44 additions and 16 deletions
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50
crypto/cipher/e_aes.c
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@ -390,28 +390,62 @@ static int aes_ctr_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
return 1;
}
static ctr128_f aes_gcm_set_key(AES_KEY *aes_key, GCM128_CONTEXT *gcm_ctx,
const uint8_t *key, size_t key_len) {
static char aesni_capable(void);
static ctr128_f aes_ctr_set_key(AES_KEY *aes_key, GCM128_CONTEXT *gcm_ctx,
block128_f *out_block, const uint8_t *key,
size_t key_len) {
if (aesni_capable()) {
aesni_set_encrypt_key(key, key_len * 8, aes_key);
if (gcm_ctx != NULL) {
CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)aesni_encrypt);
}
if (out_block) {
*out_block = (block128_f) aesni_encrypt;
}
return (ctr128_f)aesni_ctr32_encrypt_blocks;
}
if (hwaes_capable()) {
aes_v8_set_encrypt_key(key, key_len * 8, aes_key);
if (gcm_ctx != NULL) {
CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)aes_v8_encrypt);
}
if (out_block) {
*out_block = (block128_f) aes_v8_encrypt;
}
return (ctr128_f)aes_v8_ctr32_encrypt_blocks;
}
if (bsaes_capable()) {
AES_set_encrypt_key(key, key_len * 8, aes_key);
if (gcm_ctx != NULL) {
CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)AES_encrypt);
}
if (out_block) {
*out_block = (block128_f) AES_encrypt;
}
return (ctr128_f)bsaes_ctr32_encrypt_blocks;
}
if (vpaes_capable()) {
vpaes_set_encrypt_key(key, key_len * 8, aes_key);
if (out_block) {
*out_block = (block128_f) vpaes_encrypt;
}
if (gcm_ctx != NULL) {
CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)vpaes_encrypt);
}
return NULL;
}
AES_set_encrypt_key(key, key_len * 8, aes_key);
if (gcm_ctx != NULL) {
CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)AES_encrypt);
}
if (out_block) {
*out_block = (block128_f) AES_encrypt;
}
return NULL;
}
@ -422,7 +456,8 @@ static int aes_gcm_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key,
return 1;
}
if (key) {
gctx->ctr = aes_gcm_set_key(&gctx->ks.ks, &gctx->gcm, key, ctx->key_len);
gctx->ctr =
aes_ctr_set_key(&gctx->ks.ks, &gctx->gcm, NULL, key, ctx->key_len);
/* If we have an iv can set it directly, otherwise use saved IV. */
if (iv == NULL && gctx->iv_set) {
iv = gctx->iv;
@ -950,15 +985,8 @@ static int aead_aes_gcm_init(EVP_AEAD_CTX *ctx, const uint8_t *key,
return 0;
}
if (aesni_capable()) {
aesni_set_encrypt_key(key, key_len * 8, &gcm_ctx->ks.ks);
CRYPTO_gcm128_init(&gcm_ctx->gcm, &gcm_ctx->ks.ks,
(block128_f)aesni_encrypt);
gcm_ctx->ctr = (ctr128_f)aesni_ctr32_encrypt_blocks;
} else {
gcm_ctx->ctr =
aes_gcm_set_key(&gcm_ctx->ks.ks, &gcm_ctx->gcm, key, key_len);
}
aes_ctr_set_key(&gcm_ctx->ks.ks, &gcm_ctx->gcm, NULL, key, key_len);
gcm_ctx->tag_len = tag_len;
ctx->aead_state = gcm_ctx;