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[CRYPTO] ctr: Refactor into ctr and rfc3686

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As discussed previously, this patch moves the basic CTR functionality
into a chainable algorithm called ctr.  The IPsec-specific variant of
it is now placed on top with the name rfc3686.

So ctr(aes) gives a chainable cipher with IV size 16 while the IPsec
variant will be called rfc3686(ctr(aes)).  This patch also adjusts
gcm accordingly.

Signed-off-by: Herbert Xu <[email protected]>
This commit is contained in:
Herbert Xu 2007-12-17 21:34:32 +08:00
commit 5311f248b7
4 changed files with 233 additions and 136 deletions
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7
crypto/gcm.c
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@ -160,7 +160,7 @@ static void crypto_gcm_ghash_final_xor(struct crypto_gcm_ghash_ctx *ctx,
static inline void crypto_gcm_set_counter(u8 *counterblock, u32 value)
{
*((u32 *)&counterblock[12]) = cpu_to_be32(value);
*((u32 *)&counterblock[12]) = cpu_to_be32(value + 1);
}
static int crypto_gcm_encrypt_counter(struct crypto_aead *aead, u8 *block,
@ -400,9 +400,8 @@ static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
return inst;
inst = ERR_PTR(ENAMETOOLONG);
if (snprintf(
ctr_name, CRYPTO_MAX_ALG_NAME,
"ctr(%s,0,16,4)", cipher->cra_name) >= CRYPTO_MAX_ALG_NAME)
if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)",
cipher->cra_name) >= CRYPTO_MAX_ALG_NAME)
return inst;
ctr = crypto_alg_mod_lookup(ctr_name, CRYPTO_ALG_TYPE_BLKCIPHER,