From: Eric Biggers <ebiggers@kernel.org>
Date: Mon, 30 Jun 2025 16:06:36 +0000 (-0700)
Subject: lib/crypto: sha256: Add sha224() and sha224_update()
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6fa4b292204b15e0e269a9fd33bc99b5e36b6883;p=thirdparty%2Flinux.git

lib/crypto: sha256: Add sha224() and sha224_update()

Add a one-shot SHA-224 computation function sha224(), for consistency
with sha256(), sha384(), and sha512() which all already exist.

Similarly, add sha224_update().  While for now it's identical to
sha256_update(), omitting it makes the API harder to use since users
have to "know" which functions are the same between SHA-224 and SHA-256.
Also, this is a prerequisite for using different context types for each.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20250630160645.3198-6-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
---

diff --git a/include/crypto/sha2.h b/include/crypto/sha2.h
index bb181b7996cdc..e31da0743a522 100644
--- a/include/crypto/sha2.h
+++ b/include/crypto/sha2.h
@@ -114,18 +114,24 @@ struct sha512_state {
 	u8 buf[SHA512_BLOCK_SIZE];
 };
 
+void sha256_update(struct sha256_state *sctx, const u8 *data, size_t len);
+
 static inline void sha224_init(struct sha256_state *sctx)
 {
 	sha224_block_init(&sctx->ctx);
 }
-/* Simply use sha256_update as it is equivalent to sha224_update. */
+static inline void sha224_update(struct sha256_state *sctx,
+				 const u8 *data, size_t len)
+{
+	sha256_update(sctx, data, len);
+}
 void sha224_final(struct sha256_state *sctx, u8 out[SHA224_DIGEST_SIZE]);
+void sha224(const u8 *data, size_t len, u8 out[SHA224_DIGEST_SIZE]);
 
 static inline void sha256_init(struct sha256_state *sctx)
 {
 	sha256_block_init(&sctx->ctx);
 }
-void sha256_update(struct sha256_state *sctx, const u8 *data, size_t len);
 void sha256_final(struct sha256_state *sctx, u8 out[SHA256_DIGEST_SIZE]);
 void sha256(const u8 *data, size_t len, u8 out[SHA256_DIGEST_SIZE]);
 
diff --git a/lib/crypto/sha256.c b/lib/crypto/sha256.c
index 573ccecbf48bf..ccaae70880166 100644
--- a/lib/crypto/sha256.c
+++ b/lib/crypto/sha256.c
@@ -70,6 +70,16 @@ void sha256_final(struct sha256_state *sctx, u8 out[SHA256_DIGEST_SIZE])
 }
 EXPORT_SYMBOL(sha256_final);
 
+void sha224(const u8 *data, size_t len, u8 out[SHA224_DIGEST_SIZE])
+{
+	struct sha256_state sctx;
+
+	sha224_init(&sctx);
+	sha224_update(&sctx, data, len);
+	sha224_final(&sctx, out);
+}
+EXPORT_SYMBOL(sha224);
+
 void sha256(const u8 *data, size_t len, u8 out[SHA256_DIGEST_SIZE])
 {
 	struct sha256_state sctx;