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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 "lua.h"
#include "lauxlib.h"
#include <openssl/sha.h>
#include <openssl/md5.h>
#define HMAC_IPAD 0x36363636
#define HMAC_OPAD 0x5c5c5c5c
const char *hex_tab = "0123456789abcdef";
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];
}
}
#define MAKE_HASH_FUNCTION(myFunc, func, size) \
static int myFunc(lua_State *L) { \
size_t len; \
const char *s = luaL_checklstring(L, 1, &len); \
int hex_out = lua_toboolean(L, 2); \
unsigned char hash[size], result[size*2]; \
func((const unsigned char*)s, len, hash); \
if (hex_out) { \
toHex(hash, size, result); \
lua_pushlstring(L, (char*)result, size*2); \
} else { \
lua_pushlstring(L, (char*)hash, size);\
} \
return 1; \
}
MAKE_HASH_FUNCTION(Lsha1, SHA1, SHA_DIGEST_LENGTH)
MAKE_HASH_FUNCTION(Lsha224, SHA224, SHA224_DIGEST_LENGTH)
MAKE_HASH_FUNCTION(Lsha256, SHA256, SHA256_DIGEST_LENGTH)
MAKE_HASH_FUNCTION(Lsha384, SHA384, SHA384_DIGEST_LENGTH)
MAKE_HASH_FUNCTION(Lsha512, SHA512, SHA512_DIGEST_LENGTH)
MAKE_HASH_FUNCTION(Lmd5, MD5, MD5_DIGEST_LENGTH)
struct hash_desc {
int (*Init)(void*);
int (*Update)(void*, const void *, size_t);
int (*Final)(unsigned char*, void*);
size_t digestLength;
void *ctx, *ctxo;
};
static void hmac(struct hash_desc *desc, const char *key, size_t key_len,
const char *msg, size_t msg_len, unsigned char *result)
{
union xory {
unsigned char bytes[64];
uint32_t quadbytes[16];
};
int i;
char hashedKey[64]; /* Maximum used digest length */
union xory k_ipad, k_opad;
if (key_len > 64) {
desc->Init(desc->ctx);
desc->Update(desc->ctx, key, key_len);
desc->Final(desc->ctx, hashedKey);
key = (const char*)hashedKey;
key_len = desc->digestLength;
}
memcpy(k_ipad.bytes, key, key_len);
memset(k_ipad.bytes + key_len, 0, 64 - key_len);
memcpy(k_opad.bytes, k_ipad.bytes, 64);
for (i = 0; i < 16; i++) {
k_ipad.quadbytes[i] ^= HMAC_IPAD;
k_opad.quadbytes[i] ^= HMAC_OPAD;
}
desc->Init(desc->ctx);
desc->Update(desc->ctx, k_ipad.bytes, 64);
desc->Init(desc->ctxo);
desc->Update(desc->ctxo, k_opad.bytes, 64);
desc->Update(desc->ctx, msg, msg_len);
desc->Final(result, desc->ctx);
desc->Update(desc->ctxo, result, desc->digestLength);
desc->Final(result, desc->ctxo);
}
#define MAKE_HMAC_FUNCTION(myFunc, func, size, type) \
static int myFunc(lua_State *L) { \
type ctx, ctxo; \
unsigned char hash[size], result[2*size]; \
size_t key_len, msg_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); \
struct hash_desc desc; \
desc.Init = (int (*)(void*))func##_Init; \
desc.Update = (int (*)(void*, const void *, size_t))func##_Update; \
desc.Final = (int (*)(unsigned char*, void*))func##_Final; \
desc.digestLength = size; \
desc.ctx = &ctx; \
desc.ctxo = &ctxo; \
hmac(&desc, key, key_len, msg, msg_len, hash); \
if (hex_out) { \
toHex(hash, size, result); \
lua_pushlstring(L, (char*)result, size*2); \
} else { \
lua_pushlstring(L, (char*)hash, size); \
} \
return 1; \
}
MAKE_HMAC_FUNCTION(Lhmac_sha1, SHA1, SHA_DIGEST_LENGTH, SHA_CTX)
MAKE_HMAC_FUNCTION(Lhmac_sha256, SHA256, SHA256_DIGEST_LENGTH, SHA256_CTX)
MAKE_HMAC_FUNCTION(Lhmac_sha512, SHA512, SHA512_DIGEST_LENGTH, SHA512_CTX)
MAKE_HMAC_FUNCTION(Lhmac_md5, MD5, MD5_DIGEST_LENGTH, MD5_CTX)
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 },
{ NULL, NULL }
};
LUALIB_API int luaopen_util_hashes(lua_State *L)
{
luaL_register(L, "hashes", Reg);
lua_pushliteral(L, "version"); /** version */
lua_pushliteral(L, "-3.14");
lua_settable(L,-3);
return 1;
}
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