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util.hashes: Allow specifying output key length

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This is not needed for SCRAM but PBKDF2 takes this argument.
This commit is contained in:
Kim Alvefur 2019-04-20 15:11:04 +02:00
parent ffc422e2f6
commit 165ee3a5ef
2 changed files with 28 additions and 9 deletions
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21
util-src/hashes.c
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@ -100,36 +100,39 @@ 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);
const size_t len = luaL_optinteger(L, 4, SHA_DIGEST_LENGTH);
if(PKCS5_PBKDF2_HMAC(pass, pass_len, salt, salt_len, iter, EVP_sha1(), SHA_DIGEST_LENGTH, out) == 0) {
luaL_Buffer b;
unsigned char *out = (unsigned char *)luaL_buffinitsize(L, &b, len);
if(PKCS5_PBKDF2_HMAC(pass, pass_len, salt, salt_len, iter, EVP_sha1(), len, out) == 0) {
return luaL_error(L, "PKCS5_PBKDF2_HMAC() failed");
}
lua_pushlstring(L, (char *)out, SHA_DIGEST_LENGTH);
luaL_pushresultsize(&b, len);
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);
const int len = luaL_optinteger(L, 4, SHA256_DIGEST_LENGTH);
if(PKCS5_PBKDF2_HMAC(pass, pass_len, salt, salt_len, iter, EVP_sha256(), SHA256_DIGEST_LENGTH, out) == 0) {
luaL_Buffer b;
unsigned char *out = (unsigned char *)luaL_buffinitsize(L, &b, len);
if(PKCS5_PBKDF2_HMAC(pass, pass_len, salt, salt_len, iter, EVP_sha256(), len, out) == 0) {
return luaL_error(L, "PKCS5_PBKDF2_HMAC() failed");
}
lua_pushlstring(L, (char *)out, SHA_DIGEST_LENGTH);
luaL_pushresultsize(&b, len);
return 1;
}