Document hash functions.

1 files changed, 2 insertions, 2 deletions

diff --git a/crypto/hmac/hmac.c b/crypto/hmac/hmac.c
index 5c349bbb56..23b7c98f8f 100644
--- a/crypto/hmac/hmac.c
+++ b/crypto/hmac/hmac.c
@@ -109,7 +109,7 @@ void HMAC_Init(HMAC_CTX *ctx, const void *key, int len,
 	memcpy(&ctx->md_ctx,&ctx->i_ctx,sizeof(ctx->i_ctx));
 	}
 
-void HMAC_Update(HMAC_CTX *ctx, unsigned char *data, int len)
+void HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, int len)
 	{
 	EVP_DigestUpdate(&(ctx->md_ctx),data,len);
 	}
@@ -134,7 +134,7 @@ void HMAC_cleanup(HMAC_CTX *ctx)
 	}
 
 unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len,
-		    unsigned char *d, int n, unsigned char *md,
+		    const unsigned char *d, int n, unsigned char *md,
 		    unsigned int *md_len)
 	{
 	HMAC_CTX c;