Fix pointer conversion warnings

sha1.c

 {
 	SHA_INFO ctx;
 	sha_init(&ctx);
-	sha_update(&ctx, data, len);
-	sha_final(out, &ctx);
+	sha_update(&ctx, (sha_byte*)data, len);
+	sha_final((sha_byte*)out, &ctx);
 }
 
 void
 	memset(sbuf, 0, SHA_BLOCKSIZE);
 
 	sha_init(&ctx->sctx);
-	sha_update(&ctx->sctx, ctx->ipad, SHA_BLOCKSIZE);
+	sha_update(&ctx->sctx, (sha_byte*)ctx->ipad, SHA_BLOCKSIZE);
 }
 
 void
 srs_hmac_update(srs_hmac_ctx_t *ctx, char *data, int len)
 {
-	sha_update(&ctx->sctx, data, len);
+	sha_update(&ctx->sctx, (sha_byte*)data, len);
 }
 
 void
 srs_hmac_fini(srs_hmac_ctx_t *ctx, char *out)
 {
-	char	 buf[SHA_DIGESTSIZE + 1];
+	sha_byte buf[SHA_DIGESTSIZE + 1];
 
 	sha_final(buf, &ctx->sctx);
 	sha_init(&ctx->sctx);
-	sha_update(&ctx->sctx, ctx->opad, SHA_BLOCKSIZE);
+	sha_update(&ctx->sctx, (sha_byte*)ctx->opad, SHA_BLOCKSIZE);
 	sha_update(&ctx->sctx, buf, SHA_DIGESTSIZE);
-	sha_final(out, &ctx->sctx);
+	sha_final((sha_byte*)out, &ctx->sctx);
 }

srs2.c

 static srs_realloc_t	srs_f_realloc	= realloc;
 static srs_free_t		srs_f_free		= free;
 
-int		
+int
 srs_set_malloc(srs_malloc_t m, srs_realloc_t r, srs_free_t f)
 {
 	srs_f_malloc = m;
 	for (i = 0; i < srs->numsecrets; i++) {
 		memset(srs->secrets[i], 0, strlen(srs->secrets[i]));
 		srs_f_free(srs->secrets[i]);
-		srs->secrets[i] = '\0';
+		srs->secrets[i] = 0;
 	}
 	srs_f_free(srs);
 }
 					sendhost, senduser, alias);
 }
 
-int		
+int
 srs_forward_alloc(srs_t *srs, char **sptr,
 				const char *sender, const char *alias)
 {