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[CRYPTO] skcipher: Add skcipher_geniv_alloc/skcipher_geniv_free

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This patch creates the infrastructure to help the construction of givcipher
templates that wrap around existing blkcipher/ablkcipher algorithms by adding
an IV generator to them.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2007-12-05 21:08:36 +11:00
parent 927eead52c
commit ecfc43292f
4 changed files with 225 additions and 6 deletions
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10
crypto/ablkcipher.c
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@ -80,6 +80,7 @@ static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
crt->setkey = setkey;
crt->encrypt = alg->encrypt;
crt->decrypt = alg->decrypt;
crt->base = __crypto_ablkcipher_cast(tfm);
crt->ivsize = alg->ivsize;
return 0;
@ -122,11 +123,13 @@ static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
if (alg->ivsize > PAGE_SIZE / 8)
return -EINVAL;
crt->setkey = setkey;
crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
alg->setkey : setkey;
crt->encrypt = alg->encrypt;
crt->decrypt = alg->decrypt;
crt->givencrypt = alg->givencrypt;
crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt;
crt->base = __crypto_ablkcipher_cast(tfm);
crt->ivsize = alg->ivsize;
return 0;
@ -155,6 +158,11 @@ const struct crypto_type crypto_givcipher_type = {
};
EXPORT_SYMBOL_GPL(crypto_givcipher_type);
const char *crypto_default_geniv(const struct crypto_alg *alg)
{
return alg->cra_flags & CRYPTO_ALG_ASYNC ? "eseqiv" : "chainiv";
}
int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
u32 type, u32 mask)
{