util.hashes: Revert to HMAC() convenience function

Reverts some of 1e41dd0f8353

Seems HMAC() isn't deprecated after all? Must have been at some point
according to #1589

Twice as fast for some reason.

1 files changed, 2 insertions, 22 deletions

diff --git a/util-src/hashes.c b/util-src/hashes.c
index 4ad786ae..fbc86081 100644
--- a/util-src/hashes.c
+++ b/util-src/hashes.c
@@ -129,33 +129,15 @@ static int Lsha3_512(lua_State *L) {
 static int Levp_hmac(lua_State *L, const EVP_MD *evp) {
 	unsigned char hash[EVP_MAX_MD_SIZE], result[EVP_MAX_MD_SIZE * 2];
 	size_t key_len, msg_len;
-	size_t out_len = EVP_MAX_MD_SIZE;
+	unsigned int out_len = EVP_MAX_MD_SIZE;
 	const char *key = luaL_checklstring(L, 1, &key_len);
 	const char *msg = luaL_checklstring(L, 2, &msg_len);
 	const int hex_out = lua_toboolean(L, 3);
 
-	EVP_PKEY *pkey = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, NULL, (unsigned char *)key, key_len);
-	EVP_MD_CTX *ctx = EVP_MD_CTX_new();
-
-	if(ctx == NULL || pkey == NULL) {
-		goto fail;
-	}
-
-	if(!EVP_DigestSignInit(ctx, NULL, evp, NULL, pkey)) {
-		goto fail;
-	}
-
-	if(!EVP_DigestSignUpdate(ctx, msg, msg_len)) {
-		goto fail;
-	}
-
-	if(!EVP_DigestSignFinal(ctx, hash, &out_len)) {
+	if(HMAC(evp, key, key_len, (const unsigned char*)msg, msg_len, (unsigned char*)hash, &out_len) == NULL) {
 		goto fail;
 	}
 
-	EVP_MD_CTX_free(ctx);
-	EVP_PKEY_free(pkey);
-
 	if(hex_out) {
 		toHex(hash, out_len, result);
 		lua_pushlstring(L, (char *)result, out_len * 2);
@@ -166,8 +148,6 @@ static int Levp_hmac(lua_State *L, const EVP_MD *evp) {
 	return 1;
 
 fail:
-	EVP_MD_CTX_free(ctx);
-	EVP_PKEY_free(pkey);
 	return luaL_error(L, ERR_error_string(ERR_get_error(), NULL));
 }