[PATCH 13/13] crypto: lib/sha256 - improve function prototypes

[Eric Biggers <ebiggers@kernel.org>]

From: Eric Biggers <ebiggers@google.com>

Follow best practices by changing the length parameters to size_t and
explicitly specifying the length of the output digest arrays.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 include/crypto/sha2.h | 8 ++++----
 lib/crypto/sha256.c   | 8 ++++----
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/include/crypto/sha2.h b/include/crypto/sha2.h
index 444484d1b1cfa..7dfc560daa2c7 100644
--- a/include/crypto/sha2.h
+++ b/include/crypto/sha2.h
@@ -93,13 +93,13 @@ static inline void sha256_init(struct sha256_state *sctx)
 	sctx->state[5] = SHA256_H5;
 	sctx->state[6] = SHA256_H6;
 	sctx->state[7] = SHA256_H7;
 	sctx->count = 0;
 }
-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);
+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]);
 
 static inline void sha224_init(struct sha256_state *sctx)
 {
 	sctx->state[0] = SHA224_H0;
 	sctx->state[1] = SHA224_H1;
@@ -110,8 +110,8 @@ static inline void sha224_init(struct sha256_state *sctx)
 	sctx->state[6] = SHA224_H6;
 	sctx->state[7] = SHA224_H7;
 	sctx->count = 0;
 }
 /* Simply use sha256_update as it is equivalent to sha224_update. */
-void sha224_final(struct sha256_state *sctx, u8 *out);
+void sha224_final(struct sha256_state *sctx, u8 out[SHA224_DIGEST_SIZE]);
 
 #endif /* _CRYPTO_SHA2_H */
diff --git a/lib/crypto/sha256.c b/lib/crypto/sha256.c
index 182d1088d8893..50b7eeac2d89e 100644
--- a/lib/crypto/sha256.c
+++ b/lib/crypto/sha256.c
@@ -182,11 +182,11 @@ static inline void __sha256_update(struct sha256_state *sctx, const u8 *data,
 	}
 	if (len)
 		memcpy(&sctx->buf[partial], data, len);
 }
 
-void sha256_update(struct sha256_state *sctx, const u8 *data, unsigned int len)
+void sha256_update(struct sha256_state *sctx, const u8 *data, size_t len)
 {
 	__sha256_update(sctx, data, len, false);
 }
 EXPORT_SYMBOL(sha256_update);
 
@@ -213,23 +213,23 @@ static inline void __sha256_final(struct sha256_state *sctx, u8 *out,
 		put_unaligned_be32(sctx->state[i / 4], out + i);
 
 	memzero_explicit(sctx, sizeof(*sctx));
 }
 
-void sha256_final(struct sha256_state *sctx, u8 *out)
+void sha256_final(struct sha256_state *sctx, u8 out[SHA256_DIGEST_SIZE])
 {
 	__sha256_final(sctx, out, SHA256_DIGEST_SIZE, false);
 }
 EXPORT_SYMBOL(sha256_final);
 
-void sha224_final(struct sha256_state *sctx, u8 *out)
+void sha224_final(struct sha256_state *sctx, u8 out[SHA224_DIGEST_SIZE])
 {
 	__sha256_final(sctx, out, SHA224_DIGEST_SIZE, false);
 }
 EXPORT_SYMBOL(sha224_final);
 
-void sha256(const u8 *data, unsigned int len, u8 *out)
+void sha256(const u8 *data, size_t len, u8 out[SHA256_DIGEST_SIZE])
 {
 	struct sha256_state sctx;
 
 	sha256_init(&sctx);
 	sha256_update(&sctx, data, len);
-- 
2.49.0