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authorHerbert Xu <herbert@gondor.apana.org.au>2008-11-02 21:38:11 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2008-12-25 11:01:30 +1100
commitdec8b78606ebd5f309c38f2fb10196ce996dd18d (patch)
tree005ef526f1b0e953a3a57e6c991e0921fcd5234b /include/crypto/hash.h
parent3b2f6df08258e2875f42bd630eece7e7241a053b (diff)
downloadop-kernel-dev-dec8b78606ebd5f309c38f2fb10196ce996dd18d.zip
op-kernel-dev-dec8b78606ebd5f309c38f2fb10196ce996dd18d.tar.gz
crypto: hash - Add import/export interface
It is often useful to save the partial state of a hash function so that it can be used as a base for two or more computations. The most prominent example is HMAC where all hashes start from a base determined by the key. Having an import/export interface means that we only have to compute that base once rather than for each message. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include/crypto/hash.h')
-rw-r--r--include/crypto/hash.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/include/crypto/hash.h b/include/crypto/hash.h
index f9b51d4..cd16d6e 100644
--- a/include/crypto/hash.h
+++ b/include/crypto/hash.h
@@ -24,6 +24,7 @@ struct shash_desc {
struct shash_alg {
int (*init)(struct shash_desc *desc);
+ int (*reinit)(struct shash_desc *desc);
int (*update)(struct shash_desc *desc, const u8 *data,
unsigned int len);
int (*final)(struct shash_desc *desc, u8 *out);
@@ -116,6 +117,11 @@ static inline unsigned int crypto_ahash_reqsize(struct crypto_ahash *tfm)
return crypto_ahash_crt(tfm)->reqsize;
}
+static inline void *ahash_request_ctx(struct ahash_request *req)
+{
+ return req->__ctx;
+}
+
static inline int crypto_ahash_setkey(struct crypto_ahash *tfm,
const u8 *key, unsigned int keylen)
{
@@ -130,6 +136,14 @@ static inline int crypto_ahash_digest(struct ahash_request *req)
return crt->digest(req);
}
+static inline void crypto_ahash_export(struct ahash_request *req, u8 *out)
+{
+ memcpy(out, ahash_request_ctx(req),
+ crypto_ahash_reqsize(crypto_ahash_reqtfm(req)));
+}
+
+int crypto_ahash_import(struct ahash_request *req, const u8 *in);
+
static inline int crypto_ahash_init(struct ahash_request *req)
{
struct ahash_tfm *crt = crypto_ahash_crt(crypto_ahash_reqtfm(req));
@@ -262,6 +276,13 @@ int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out);
+static inline void crypto_shash_export(struct shash_desc *desc, u8 *out)
+{
+ memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
+}
+
+int crypto_shash_import(struct shash_desc *desc, const u8 *in);
+
static inline int crypto_shash_init(struct shash_desc *desc)
{
return crypto_shash_alg(desc->tfm)->init(desc);
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