/*
 * Copyright 2018-2019 The OpenSSL Project Authors. All Rights Reserved.
 * Copyright (c) 2018-2019, Oracle and/or its affiliates.  All rights reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <string.h>
#include <openssl/err.h>
#include <openssl/fips.h>
#include "crypto/fips.h"

#include <openssl/evp.h>
#include <openssl/kdf.h>

#ifdef OPENSSL_FIPS
int FIPS_selftest_pbkdf2(void)
{
    int ret = 0;
    EVP_KDF_CTX *kctx;
    unsigned char out[32];

    if ((kctx = EVP_KDF_CTX_new_id(EVP_KDF_PBKDF2)) == NULL) {
        goto err;
    }
    if (EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_PASS, "password", (size_t)8) <= 0) {
        goto err;
    }
    if (EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_SALT, "salt", (size_t)4) <= 0) {
        goto err;
    }
    if (EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_ITER, 2) <= 0) {
        goto err;
    }
    if (EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_MD, EVP_sha256()) <= 0) {
        goto err;
    }
    if (EVP_KDF_derive(kctx, out, sizeof(out)) <= 0) {
        goto err;
    }

    {
        const unsigned char expected[sizeof(out)] = {
            0xae, 0x4d, 0x0c, 0x95, 0xaf, 0x6b, 0x46, 0xd3,
            0x2d, 0x0a, 0xdf, 0xf9, 0x28, 0xf0, 0x6d, 0xd0,
            0x2a, 0x30, 0x3f, 0x8e, 0xf3, 0xc2, 0x51, 0xdf,
            0xd6, 0xe2, 0xd8, 0x5a, 0x95, 0x47, 0x4c, 0x43
        };
        if (memcmp(out, expected, sizeof(expected))) {
            goto err;
        }
    }
    ret = 1;

err:
    if (!ret)
        FIPSerr(FIPS_F_FIPS_SELFTEST_PBKDF2, FIPS_R_SELFTEST_FAILED);
    EVP_KDF_CTX_free(kctx);
    return ret;
}

/* Test vector from RFC 8009 (AES Encryption with HMAC-SHA2 for Kerberos
 * 5) appendix A. */
int FIPS_selftest_kbkdf(void)
{
    int ret = 0;
    EVP_KDF_CTX *kctx;
    char *label = "prf", *prf_input = "test";
    static unsigned char input_key[] = {
        0x37, 0x05, 0xD9, 0x60, 0x80, 0xC1, 0x77, 0x28,
        0xA0, 0xE8, 0x00, 0xEA, 0xB6, 0xE0, 0xD2, 0x3C,
    };
    static unsigned char output[] = {
        0x9D, 0x18, 0x86, 0x16, 0xF6, 0x38, 0x52, 0xFE,
        0x86, 0x91, 0x5B, 0xB8, 0x40, 0xB4, 0xA8, 0x86,
        0xFF, 0x3E, 0x6B, 0xB0, 0xF8, 0x19, 0xB4, 0x9B,
        0x89, 0x33, 0x93, 0xD3, 0x93, 0x85, 0x42, 0x95,
    };
    unsigned char result[sizeof(output)] = { 0 };

    if ((kctx = EVP_KDF_CTX_new_id(EVP_KDF_KB)) == NULL) {
        goto err;
    }
    if (EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_KB_MAC_TYPE, EVP_KDF_KB_MAC_TYPE_HMAC) <= 0) {
        goto err;
    }
    if (EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_MD, EVP_sha256()) <= 0) {
        goto err;
    }
    if (EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_KEY, input_key, sizeof(input_key)) <= 0) {
        goto err;
    }
    if (EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_SALT, label, strlen(label)) <= 0) {
        goto err;
    }
    if (EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_KB_INFO, prf_input, strlen(prf_input)) <= 0) {
        goto err;
    }
    ret = EVP_KDF_derive(kctx, result, sizeof(result)) > 0
        && memcmp(result, output, sizeof(output)) == 0;
err:

    if (!ret)
        FIPSerr(FIPS_F_FIPS_SELFTEST_KBKDF, FIPS_R_SELFTEST_FAILED);
    EVP_KDF_CTX_free(kctx);
    return ret;
}

int FIPS_selftest_kdf(void)
{
    return FIPS_selftest_pbkdf2() && FIPS_selftest_kbkdf();
}

#endif