Make SHA* function prototypes consistent.

src/platform/vboot_reference/crypto/sha1.c

 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /* SHA-1 implementation largely based on libmincrypt in the the Android
  * Open Source Project (platorm/system/core.git/libmincrypt/sha.c
  */
 
 #include "sha.h"
@@ skipping 257 matching lines @@
 
 void SHA1_init(SHA1_CTX* ctx) {
   ctx->state[0] = 0x67452301;
   ctx->state[1] = 0xEFCDAB89;
   ctx->state[2] = 0x98BADCFE;
   ctx->state[3] = 0x10325476;
   ctx->state[4] = 0xC3D2E1F0;
   ctx->count = 0;
 }
 
-uint8_t* SHA1(const void *data, int len, uint8_t *digest) {
+uint8_t* SHA1(const uint8_t *data, int len, uint8_t *digest) {
   const uint8_t *p;
   int i;
   SHA1_CTX ctx;
   SHA1_init(&ctx);
   SHA1_update(&ctx, data, len);
   p = SHA1_final(&ctx);
   for (i = 0; i < SHA1_DIGEST_SIZE; ++i) {
     digest[i] = *p++;
   }
   return digest;
 }