[CIFS] Rename md5 functions to avoid collision with new rt modules

When rt modules were added they (each) included their own md5
with names which collided with the existing names of cifs's md5 functions.

Renaming cifs's md5 modules so we don't collide with them.

> Stephen Rothwell wrote:
> When CIFS is built-in (=y) and staging/rt28[67]0 =y, there are multiple
> definitions of:
>
> build-r8250.out:(.text+0x1d8ad0): multiple definition of `MD5Init'
> build-r8250.out:(.text+0x1dbb30): multiple definition of `MD5Update'
> build-r8250.out:(.text+0x1db9b0): multiple definition of `MD5Final'
>
> all of which need to have more unique identifiers for their global
> symbols (e.g., rt28_md5_init, cifs_md5_init, foo, blah, bar).
>

CC: Greg K-H <gregkh@suse.de>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/cifsencrypt.c

@@ -48,11 +48,11 @@ static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
 	if ((cifs_pdu == NULL) || (signature == NULL) || (key == NULL))
 		return -EINVAL;
 
-	MD5Init(&context);
-	MD5Update(&context, (char *)&key->data, key->len);
-	MD5Update(&context, cifs_pdu->Protocol, cifs_pdu->smb_buf_length);
+	cifs_MD5_init(&context);
+	cifs_MD5_update(&context, (char *)&key->data, key->len);
+	cifs_MD5_update(&context, cifs_pdu->Protocol, cifs_pdu->smb_buf_length);
 
-	MD5Final(signature, &context);
+	cifs_MD5_final(signature, &context);
 	return 0;
 }
 
@@ -96,8 +96,8 @@ static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
 	if ((iov == NULL) || (signature == NULL) || (key == NULL))
 		return -EINVAL;
 
-	MD5Init(&context);
-	MD5Update(&context, (char *)&key->data, key->len);
+	cifs_MD5_init(&context);
+	cifs_MD5_update(&context, (char *)&key->data, key->len);
 	for (i = 0; i < n_vec; i++) {
 		if (iov[i].iov_len == 0)
 			continue;
@@ -110,13 +110,13 @@ static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
 		if (i == 0) {
 			if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
 				break; /* nothing to sign or corrupt header */
-			MD5Update(&context, iov[0].iov_base+4,
+			cifs_MD5_update(&context, iov[0].iov_base+4,
 				  iov[0].iov_len-4);
 		} else
-			MD5Update(&context, iov[i].iov_base, iov[i].iov_len);
+			cifs_MD5_update(&context, iov[i].iov_base, iov[i].iov_len);
 	}
 
-	MD5Final(signature, &context);
+	cifs_MD5_final(signature, &context);
 
 	return 0;
 }

fs/cifs/md5.c

@@ -10,8 +10,8 @@
  * with every copy.
  *
  * To compute the message digest of a chunk of bytes, declare an
- * MD5Context structure, pass it to MD5Init, call MD5Update as
- * needed on buffers full of bytes, and then call MD5Final, which
+ * MD5Context structure, pass it to cifs_MD5_init, call cifs_MD5_update as
+ * needed on buffers full of bytes, and then call cifs_MD5_final, which
  * will fill a supplied 16-byte array with the digest.
  */
 
@@ -45,7 +45,7 @@ byteReverse(unsigned char *buf, unsigned longs)
  * initialization constants.
  */
 void
-MD5Init(struct MD5Context *ctx)
+cifs_MD5_init(struct MD5Context *ctx)
 {
 	ctx->buf[0] = 0x67452301;
 	ctx->buf[1] = 0xefcdab89;
@@ -61,7 +61,7 @@ MD5Init(struct MD5Context *ctx)
  * of bytes.
  */
 void
-MD5Update(struct MD5Context *ctx, unsigned char const *buf, unsigned len)
+cifs_MD5_update(struct MD5Context *ctx, unsigned char const *buf, unsigned len)
 {
 	register __u32 t;
 
@@ -110,7 +110,7 @@ MD5Update(struct MD5Context *ctx, unsigned char const *buf, unsigned len)
  * 1 0* (64-bit count of bits processed, MSB-first)
  */
 void
-MD5Final(unsigned char digest[16], struct MD5Context *ctx)
+cifs_MD5_final(unsigned char digest[16], struct MD5Context *ctx)
 {
 	unsigned int count;
 	unsigned char *p;
@@ -165,7 +165,7 @@ MD5Final(unsigned char digest[16], struct MD5Context *ctx)
 
 /*
  * The core of the MD5 algorithm, this alters an existing MD5 hash to
- * reflect the addition of 16 longwords of new data.  MD5Update blocks
+ * reflect the addition of 16 longwords of new data.  cifs_MD5_update blocks
  * the data and converts bytes into longwords for this routine.
  */
 static void
@@ -267,9 +267,9 @@ hmac_md5_init_rfc2104(unsigned char *key, int key_len,
 		unsigned char tk[16];
 		struct MD5Context tctx;
 
-		MD5Init(&tctx);
-		MD5Update(&tctx, key, key_len);
-		MD5Final(tk, &tctx);
+		cifs_MD5_init(&tctx);
+		cifs_MD5_update(&tctx, key, key_len);
+		cifs_MD5_final(tk, &tctx);
 
 		key = tk;
 		key_len = 16;
@@ -287,8 +287,8 @@ hmac_md5_init_rfc2104(unsigned char *key, int key_len,
 		ctx->k_opad[i] ^= 0x5c;
 	}
 
-	MD5Init(&ctx->ctx);
-	MD5Update(&ctx->ctx, ctx->k_ipad, 64);
+	cifs_MD5_init(&ctx->ctx);
+	cifs_MD5_update(&ctx->ctx, ctx->k_ipad, 64);
 }
 #endif
 
@@ -317,8 +317,8 @@ hmac_md5_init_limK_to_64(const unsigned char *key, int key_len,
 		ctx->k_opad[i] ^= 0x5c;
 	}
 
-	MD5Init(&ctx->ctx);
-	MD5Update(&ctx->ctx, ctx->k_ipad, 64);
+	cifs_MD5_init(&ctx->ctx);
+	cifs_MD5_update(&ctx->ctx, ctx->k_ipad, 64);
 }
 
 /***********************************************************************
@@ -328,7 +328,7 @@ void
 hmac_md5_update(const unsigned char *text, int text_len,
 		struct HMACMD5Context *ctx)
 {
-	MD5Update(&ctx->ctx, text, text_len);	/* then text of datagram */
+	cifs_MD5_update(&ctx->ctx, text, text_len);	/* then text of datagram */
 }
 
 /***********************************************************************
@@ -339,12 +339,12 @@ hmac_md5_final(unsigned char *digest, struct HMACMD5Context *ctx)
 {
 	struct MD5Context ctx_o;
 
-	MD5Final(digest, &ctx->ctx);
+	cifs_MD5_final(digest, &ctx->ctx);
 
-	MD5Init(&ctx_o);
-	MD5Update(&ctx_o, ctx->k_opad, 64);
-	MD5Update(&ctx_o, digest, 16);
-	MD5Final(digest, &ctx_o);
+	cifs_MD5_init(&ctx_o);
+	cifs_MD5_update(&ctx_o, ctx->k_opad, 64);
+	cifs_MD5_update(&ctx_o, digest, 16);
+	cifs_MD5_final(digest, &ctx_o);
 }
 
 /***********************************************************

fs/cifs/md5.h

@@ -20,10 +20,10 @@ struct HMACMD5Context {
 };
 #endif				/* _HMAC_MD5_H */
 
-void MD5Init(struct MD5Context *context);
-void MD5Update(struct MD5Context *context, unsigned char const *buf,
+void cifs_MD5_init(struct MD5Context *context);
+void cifs_MD5_update(struct MD5Context *context, unsigned char const *buf,
 			unsigned len);
-void MD5Final(unsigned char digest[16], struct MD5Context *context);
+void cifs_MD5_final(unsigned char digest[16], struct MD5Context *context);
 
 /* The following definitions come from lib/hmacmd5.c  */