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[v2,2/5] crypto: lib/sha256 - add sha256() function

Message ID 20200708163943.52071-3-ebiggers@kernel.org (mailing list archive)
State New, archived
Headers show
Series crypto: add sha256() function | expand

Commit Message

Eric Biggers July 8, 2020, 4:39 p.m. UTC 
From: Eric Biggers <ebiggers@google.com>

Add a function sha256() which computes a SHA-256 digest in one step,
combining sha256_init() + sha256_update() + sha256_final().

This is similar to how we also have blake2s().

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 include/crypto/sha.h |  1 +
 lib/crypto/sha256.c  | 10 ++++++++++
 2 files changed, 11 insertions(+)
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Patch

diff --git a/include/crypto/sha.h b/include/crypto/sha.h
index 10753ff71d46..4ff3da816630 100644
--- a/include/crypto/sha.h
+++ b/include/crypto/sha.h
@@ -147,6 +147,7 @@  static inline void sha256_init(struct sha256_state *sctx)
 }
 void sha256_update(struct sha256_state *sctx, const u8 *data, unsigned int len);
 void sha256_final(struct sha256_state *sctx, u8 *out);
+void sha256(const u8 *data, unsigned int len, u8 *out);
 
 static inline void sha224_init(struct sha256_state *sctx)
 {
diff --git a/lib/crypto/sha256.c b/lib/crypto/sha256.c
index 2e621697c5c3..2321f6cb322f 100644
--- a/lib/crypto/sha256.c
+++ b/lib/crypto/sha256.c
@@ -280,4 +280,14 @@  void sha224_final(struct sha256_state *sctx, u8 *out)
 }
 EXPORT_SYMBOL(sha224_final);
 
+void sha256(const u8 *data, unsigned int len, u8 *out)
+{
+	struct sha256_state sctx;
+
+	sha256_init(&sctx);
+	sha256_update(&sctx, data, len);
+	sha256_final(&sctx, out);
+}
+EXPORT_SYMBOL(sha256);
+
 MODULE_LICENSE("GPL");