Document hash functions.

3 files changed, 7 insertions, 6 deletions

diff --git a/crypto/mdc2/mdc2.h b/crypto/mdc2/mdc2.h
index ec8e159fc9..00acd707cd 100644
--- a/crypto/mdc2/mdc2.h
+++ b/crypto/mdc2/mdc2.h
@@ -82,9 +82,10 @@ typedef struct mdc2_ctx_st
 
 
 void MDC2_Init(MDC2_CTX *c);
-void MDC2_Update(MDC2_CTX *c, unsigned char *data, unsigned long len);
+void MDC2_Update(MDC2_CTX *c, const unsigned char *data, unsigned long len);
 void MDC2_Final(unsigned char *md, MDC2_CTX *c);
-unsigned char *MDC2(unsigned char *d, unsigned long n, unsigned char *md);
+unsigned char *MDC2(const unsigned char *d, unsigned long n,
+	unsigned char *md);
 
 #ifdef  __cplusplus
 }
diff --git a/crypto/mdc2/mdc2_one.c b/crypto/mdc2/mdc2_one.c
index 1c3a093c39..6cd141b4d6 100644
--- a/crypto/mdc2/mdc2_one.c
+++ b/crypto/mdc2/mdc2_one.c
@@ -60,7 +60,7 @@
 #include "cryptlib.h"
 #include <openssl/mdc2.h>
 
-unsigned char *MDC2(unsigned char *d, unsigned long n, unsigned char *md)
+unsigned char *MDC2(const unsigned char *d, unsigned long n, unsigned char *md)
 	{
 	MDC2_CTX c;
 	static unsigned char m[MDC2_DIGEST_LENGTH];
diff --git a/crypto/mdc2/mdc2dgst.c b/crypto/mdc2/mdc2dgst.c
index aed715c69d..c630a24c2e 100644
--- a/crypto/mdc2/mdc2dgst.c
+++ b/crypto/mdc2/mdc2dgst.c
@@ -74,7 +74,7 @@
 			*((c)++)=(unsigned char)(((l)>>16L)&0xff), \
 			*((c)++)=(unsigned char)(((l)>>24L)&0xff))
 
-static void mdc2_body(MDC2_CTX *c, unsigned char *in, unsigned int len);
+static void mdc2_body(MDC2_CTX *c, const unsigned char *in, unsigned int len);
 void MDC2_Init(MDC2_CTX *c)
 	{
 	c->num=0;
@@ -83,7 +83,7 @@ void MDC2_Init(MDC2_CTX *c)
 	memset(&(c->hh[0]),0x25,MDC2_BLOCK);
 	}
 
-void MDC2_Update(MDC2_CTX *c, register unsigned char *in, unsigned long len)
+void MDC2_Update(MDC2_CTX *c, const unsigned char *in, unsigned long len)
 	{
 	int i,j;
 
@@ -118,7 +118,7 @@ void MDC2_Update(MDC2_CTX *c, register unsigned char *in, unsigned long len)
 		}
 	}
 
-static void mdc2_body(MDC2_CTX *c, unsigned char *in, unsigned int len)
+static void mdc2_body(MDC2_CTX *c, const unsigned char *in, unsigned int len)
 	{
 	register DES_LONG tin0,tin1;
 	register DES_LONG ttin0,ttin1;