crypto: hash - Export shash through hash
This patch allows shash algorithms to be used through the old hash
interface. This is a transitional measure so we can convert the
underlying algorithms to shash before converting the users across.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/shash.c b/crypto/shash.c
index 26aff3f..50d69a4 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -301,9 +301,114 @@
return 0;
}
+static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct shash_desc *desc = crypto_hash_ctx(tfm);
+
+ return crypto_shash_setkey(desc->tfm, key, keylen);
+}
+
+static int shash_compat_init(struct hash_desc *hdesc)
+{
+ struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
+
+ desc->flags = hdesc->flags;
+
+ return crypto_shash_init(desc);
+}
+
+static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
+ unsigned int len)
+{
+ struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
+ struct crypto_hash_walk walk;
+ int nbytes;
+
+ for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
+ nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
+ nbytes = crypto_shash_update(desc, walk.data, nbytes);
+
+ return nbytes;
+}
+
+static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
+{
+ return crypto_shash_final(crypto_hash_ctx(hdesc->tfm), out);
+}
+
+static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
+ unsigned int nbytes, u8 *out)
+{
+ unsigned int offset = sg->offset;
+ int err;
+
+ if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
+ struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
+ void *data;
+
+ desc->flags = hdesc->flags;
+
+ data = crypto_kmap(sg_page(sg), 0);
+ err = crypto_shash_digest(desc, data + offset, nbytes, out);
+ crypto_kunmap(data, 0);
+ crypto_yield(desc->flags);
+ goto out;
+ }
+
+ err = shash_compat_init(hdesc);
+ if (err)
+ goto out;
+
+ err = shash_compat_update(hdesc, sg, nbytes);
+ if (err)
+ goto out;
+
+ err = shash_compat_final(hdesc, out);
+
+out:
+ return err;
+}
+
+static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
+{
+ struct shash_desc *desc= crypto_tfm_ctx(tfm);
+
+ crypto_free_shash(desc->tfm);
+}
+
+static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
+{
+ struct hash_tfm *crt = &tfm->crt_hash;
+ struct crypto_alg *calg = tfm->__crt_alg;
+ struct shash_alg *alg = __crypto_shash_alg(calg);
+ struct shash_desc *desc = crypto_tfm_ctx(tfm);
+ struct crypto_shash *shash;
+
+ shash = __crypto_shash_cast(crypto_create_tfm(
+ calg, &crypto_shash_type));
+ if (IS_ERR(shash))
+ return PTR_ERR(shash);
+
+ desc->tfm = shash;
+ tfm->exit = crypto_exit_shash_ops_compat;
+
+ crt->init = shash_compat_init;
+ crt->update = shash_compat_update;
+ crt->final = shash_compat_final;
+ crt->digest = shash_compat_digest;
+ crt->setkey = shash_compat_setkey;
+
+ crt->digestsize = alg->digestsize;
+
+ return 0;
+}
+
static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
{
switch (mask & CRYPTO_ALG_TYPE_MASK) {
+ case CRYPTO_ALG_TYPE_HASH_MASK:
+ return crypto_init_shash_ops_compat(tfm);
case CRYPTO_ALG_TYPE_AHASH_MASK:
return crypto_init_shash_ops_async(tfm);
}
@@ -314,7 +419,11 @@
static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
u32 mask)
{
+ struct shash_alg *salg = __crypto_shash_alg(alg);
+
switch (mask & CRYPTO_ALG_TYPE_MASK) {
+ case CRYPTO_ALG_TYPE_HASH_MASK:
+ return sizeof(struct shash_desc) + salg->descsize;
case CRYPTO_ALG_TYPE_AHASH_MASK:
return sizeof(struct crypto_shash *);
}