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/* Prosody IM
-- Copyright (C) 2009-2010 Matthew Wild
-- Copyright (C) 2009-2010 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
*/
/*
* hashes.c
* Lua library for sha1, sha256 and md5 hashes
*/
#include <string.h>
#include <stdlib.h>
#ifdef _MSC_VER
typedef unsigned __int32 uint32_t;
#else
#include <inttypes.h>
#endif
#include "lua.h"
#include "lauxlib.h"
#include <openssl/crypto.h>
#include <openssl/sha.h>
#include <openssl/md5.h>
#include <openssl/hmac.h>
#include <openssl/evp.h>
#if (LUA_VERSION_NUM == 501)
#define luaL_setfuncs(L, R, N) luaL_register(L, NULL, R)
#endif
#define HMAC_IPAD 0x36363636
#define HMAC_OPAD 0x5c5c5c5c
static const char *hex_tab = "0123456789abcdef";
static void toHex(const unsigned char *in, int length, unsigned char *out) {
int i;
for(i = 0; i < length; i++) {
out[i * 2] = hex_tab[(in[i] >> 4) & 0xF];
out[i * 2 + 1] = hex_tab[(in[i]) & 0xF];
}
}
static int Levp_hash(lua_State *L, const EVP_MD *evp) {
size_t len;
unsigned int size = EVP_MAX_MD_SIZE;
const char *s = luaL_checklstring(L, 1, &len);
int hex_out = lua_toboolean(L, 2);
unsigned char hash[EVP_MAX_MD_SIZE], result[EVP_MAX_MD_SIZE * 2];
EVP_MD_CTX *ctx = EVP_MD_CTX_new();
if(ctx == NULL) {
goto fail;
}
if(!EVP_DigestInit_ex(ctx, evp, NULL)) {
goto fail;
}
if(!EVP_DigestUpdate(ctx, s, len)) {
goto fail;
}
if(!EVP_DigestFinal_ex(ctx, hash, &size)) {
goto fail;
}
EVP_MD_CTX_free(ctx);
if(hex_out) {
toHex(hash, size, result);
lua_pushlstring(L, (char *)result, size * 2);
} else {
lua_pushlstring(L, (char *)hash, size);
}
return 1;
fail:
EVP_MD_CTX_free(ctx);
return luaL_error(L, "hash function failed");
}
static int Lsha1(lua_State *L) {
return Levp_hash(L, EVP_sha1());
}
static int Lsha224(lua_State *L) {
return Levp_hash(L, EVP_sha224());
}
static int Lsha256(lua_State *L) {
return Levp_hash(L, EVP_sha256());
}
static int Lsha384(lua_State *L) {
return Levp_hash(L, EVP_sha384());
}
static int Lsha512(lua_State *L) {
return Levp_hash(L, EVP_sha512());
}
static int Lmd5(lua_State *L) {
return Levp_hash(L, EVP_md5());
}
struct hash_desc {
int (*Init)(void *);
int (*Update)(void *, const void *, size_t);
int (*Final)(unsigned char *, void *);
size_t digestLength;
void *ctx, *ctxo;
};
#define MAKE_HMAC_FUNCTION(myFunc, evp, size, type) \
static int myFunc(lua_State *L) { \
unsigned char hash[size], result[2*size]; \
size_t key_len, msg_len; \
unsigned int out_len; \
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); \
HMAC(evp(), key, key_len, (const unsigned char*)msg, msg_len, (unsigned char*)hash, &out_len); \
if (hex_out) { \
toHex(hash, out_len, result); \
lua_pushlstring(L, (char*)result, out_len*2); \
} else { \
lua_pushlstring(L, (char*)hash, out_len); \
} \
return 1; \
}
MAKE_HMAC_FUNCTION(Lhmac_sha1, EVP_sha1, SHA_DIGEST_LENGTH, SHA_CTX)
MAKE_HMAC_FUNCTION(Lhmac_sha256, EVP_sha256, SHA256_DIGEST_LENGTH, SHA256_CTX)
MAKE_HMAC_FUNCTION(Lhmac_sha512, EVP_sha512, SHA512_DIGEST_LENGTH, SHA512_CTX)
MAKE_HMAC_FUNCTION(Lhmac_md5, EVP_md5, MD5_DIGEST_LENGTH, MD5_CTX)
static int Lpbkdf2_sha1(lua_State *L) {
unsigned char out[SHA_DIGEST_LENGTH];
size_t pass_len, salt_len;
const char *pass = luaL_checklstring(L, 1, &pass_len);
const unsigned char *salt = (unsigned char *)luaL_checklstring(L, 2, &salt_len);
const int iter = luaL_checkinteger(L, 3);
if(PKCS5_PBKDF2_HMAC(pass, pass_len, salt, salt_len, iter, EVP_sha1(), SHA_DIGEST_LENGTH, out) == 0) {
return luaL_error(L, "PKCS5_PBKDF2_HMAC() failed");
}
lua_pushlstring(L, (char *)out, SHA_DIGEST_LENGTH);
return 1;
}
static int Lpbkdf2_sha256(lua_State *L) {
unsigned char out[SHA256_DIGEST_LENGTH];
size_t pass_len, salt_len;
const char *pass = luaL_checklstring(L, 1, &pass_len);
const unsigned char *salt = (unsigned char *)luaL_checklstring(L, 2, &salt_len);
const int iter = luaL_checkinteger(L, 3);
if(PKCS5_PBKDF2_HMAC(pass, pass_len, salt, salt_len, iter, EVP_sha256(), SHA256_DIGEST_LENGTH, out) == 0) {
return luaL_error(L, "PKCS5_PBKDF2_HMAC() failed");
}
lua_pushlstring(L, (char *)out, SHA256_DIGEST_LENGTH);
return 1;
}
static int Lhash_equals(lua_State *L) {
size_t len1, len2;
const char *s1 = luaL_checklstring(L, 1, &len1);
const char *s2 = luaL_checklstring(L, 2, &len2);
if(len1 == len2) {
lua_pushboolean(L, CRYPTO_memcmp(s1, s2, len1) == 0);
} else {
lua_pushboolean(L, 0);
}
return 1;
}
static const luaL_Reg Reg[] = {
{ "sha1", Lsha1 },
{ "sha224", Lsha224 },
{ "sha256", Lsha256 },
{ "sha384", Lsha384 },
{ "sha512", Lsha512 },
{ "md5", Lmd5 },
{ "hmac_sha1", Lhmac_sha1 },
{ "hmac_sha256", Lhmac_sha256 },
{ "hmac_sha512", Lhmac_sha512 },
{ "hmac_md5", Lhmac_md5 },
{ "scram_Hi_sha1", Lpbkdf2_sha1 }, /* COMPAT */
{ "pbkdf2_hmac_sha1", Lpbkdf2_sha1 },
{ "pbkdf2_hmac_sha256", Lpbkdf2_sha256 },
{ "equals", Lhash_equals },
{ NULL, NULL }
};
LUALIB_API int luaopen_util_hashes(lua_State *L) {
#if (LUA_VERSION_NUM > 501)
luaL_checkversion(L);
#endif
lua_newtable(L);
luaL_setfuncs(L, Reg, 0);
lua_pushliteral(L, "-3.14");
lua_setfield(L, -2, "version");
#ifdef OPENSSL_VERSION
lua_pushstring(L, OpenSSL_version(OPENSSL_VERSION));
lua_setfield(L, -2, "_LIBCRYPTO_VERSION");
#endif
return 1;
}
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