digest: add digest callback

Combination of @init and @update and @final. This function
effectively behaves as the entire chain of operations, @init,
@update and @final issued in sequence. This is added for hardware
which cannot do even the @finup, but can only do the whole
transformation in one run.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

crypto/digest.c

@@ -58,6 +58,24 @@ end:
 	return ret;
 }
 
+int digest_generic_digest(struct digest *d, const void *data,
+			  unsigned int len, u8 *md)
+
+{
+	int ret;
+
+	if (!data || len == 0 || !md)
+		return -EINVAL;
+
+	ret = digest_init(d);
+	if (ret)
+		return ret;
+	ret = digest_update(d, data, len);
+	if (ret)
+		return ret;
+	return digest_final(d, md);
+}
+
 int digest_algo_register(struct digest_algo *d)
 {
 	if (!d || !d->name || !d->update || !d->final || !d->verify ||

crypto/hmac.c

@@ -136,6 +136,7 @@ struct digest_algo hmac_algo = {
 	.init = digest_hmac_init,
 	.update = digest_hmac_update,
 	.final = digest_hmac_final,
+	.digest = digest_generic_digest,
 	.verify = digest_generic_verify,
 	.set_key = digest_hmac_set_key,
 	.free = digest_hmac_free,

crypto/internal.h

@@ -15,3 +15,5 @@ static inline int digest_hmac_register(struct digest_algo *algo,
 #endif
 
 int digest_generic_verify(struct digest *d, const unsigned char *md);
+int digest_generic_digest(struct digest *d, const void *data,
+			  unsigned int len, u8 *out);

crypto/md5.c

@@ -294,6 +294,7 @@ static struct digest_algo md5 = {
 	.init = digest_md5_init,
 	.update = digest_md5_update,
 	.final = digest_md5_final,
+	.digest = digest_generic_digest,
 	.verify = digest_generic_verify,
 	.length = 16,
 	.ctx_length = sizeof(struct MD5Context),

crypto/sha1.c

@@ -315,6 +315,7 @@ static struct digest_algo m = {
 	.init = digest_sha1_init,
 	.update = digest_sha1_update,
 	.final = digest_sha1_final,
+	.digest = digest_generic_digest,
 	.verify = digest_generic_verify,
 	.length = SHA1_SUM_LEN,
 	.ctx_length = sizeof(sha1_context),

crypto/sha2.c

@@ -336,6 +336,7 @@ static struct digest_algo m256 = {
 	.init = digest_sha256_init,
 	.update = digest_sha2_update,
 	.final = digest_sha2_final,
+	.digest = digest_generic_digest,
 	.verify = digest_generic_verify,
 	.length = SHA256_SUM_LEN,
 	.ctx_length = sizeof(sha2_context),

crypto/sha4.c

@@ -342,6 +342,7 @@ static struct digest_algo m512 = {
 	.init = digest_sha512_init,
 	.update = digest_sha4_update,
 	.final = digest_sha4_final,
+	.digest = digest_generic_digest,
 	.verify = digest_generic_verify,
 	.length = SHA512_SUM_LEN,
 	.ctx_length = sizeof(sha4_context),

include/digest.h

@@ -31,6 +31,8 @@ struct digest_algo {
 	int (*init)(struct digest *d);
 	int (*update)(struct digest *d, const void *data, unsigned long len);
 	int (*final)(struct digest *d, unsigned char *md);
+	int (*digest)(struct digest *d, const void *data,
+		      unsigned int len, u8 *out);
 	int (*set_key)(struct digest *d, const unsigned char *key, unsigned int len);
 	int (*verify)(struct digest *d, const unsigned char *md);
 
@@ -78,6 +80,12 @@ static inline int digest_final(struct digest *d, unsigned char *md)
 	return d->algo->final(d, md);
 }
 
+static inline int digest_digest(struct digest *d, const void *data,
+		      unsigned int len, u8 *md)
+{
+	return d->algo->digest(d, data, len, md);
+}
+
 static inline int digest_verify(struct digest *d, const unsigned char *md)
 {
 	return d->algo->verify(d, md);