path: root/include/crypto
diff options
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
parentcrypto: hash - Export shash through ahash (diff)
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')
2 files changed, 21 insertions, 5 deletions
diff --git a/include/crypto/hash.h b/include/crypto/hash.h
index f9b51d408953..cd16d6e668ce 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);
diff --git a/include/crypto/internal/hash.h b/include/crypto/internal/hash.h
index 32d3a8ed06de..92fbe7385856 100644
--- a/include/crypto/internal/hash.h
+++ b/include/crypto/internal/hash.h
@@ -66,11 +66,6 @@ static inline struct ahash_request *ahash_dequeue_request(
return ahash_request_cast(crypto_dequeue_request(queue));
-static inline void *ahash_request_ctx(struct ahash_request *req)
- return req->__ctx;
static inline int ahash_tfm_in_queue(struct crypto_queue *queue,
struct crypto_ahash *tfm)