Document hash functions.

1 files changed, 1 insertions, 1 deletions

diff --git a/crypto/md5/md5.h b/crypto/md5/md5.h
index bdab6d45e8..d9b7383446 100644
--- a/crypto/md5/md5.h
+++ b/crypto/md5/md5.h
@@ -105,7 +105,7 @@ typedef struct MD5state_st
 void MD5_Init(MD5_CTX *c);
 void MD5_Update(MD5_CTX *c, const unsigned char *data, unsigned long len);
 void MD5_Final(unsigned char *md, MD5_CTX *c);
-unsigned char *MD5(unsigned char *d, unsigned long n, unsigned char *md);
+unsigned char *MD5(const unsigned char *d, unsigned long n, unsigned char *md);
 void MD5_Transform(MD5_CTX *c, const unsigned char *b);
 #ifdef  __cplusplus
 }