/* $OpenBSD: tls_prf.c,v 1.11 2024/07/16 14:38:59 jsing Exp $ */
/*
 * Copyright (c) 2017 Joel Sing <jsing@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <err.h>

#include "ssl_local.h"

int tls1_PRF(SSL *s, const unsigned char *secret, size_t secret_len,
    const void *seed1, size_t seed1_len, const void *seed2, size_t seed2_len,
    const void *seed3, size_t seed3_len, const void *seed4, size_t seed4_len,
    const void *seed5, size_t seed5_len, unsigned char *out, size_t out_len);

#define TLS_PRF_OUT_LEN 128

struct tls_prf_test {
        const unsigned char *desc;
        const SSL_METHOD *(*ssl_method)(void);
        const uint16_t cipher_value;
        const unsigned char out[TLS_PRF_OUT_LEN];
};

static const struct tls_prf_test tls_prf_tests[] = {
        {
                .desc = "SHA256",
                .ssl_method = TLSv1_2_method,
                .cipher_value = 0x0033,
                .out = {
                         0x37, 0xa7, 0x06, 0x71, 0x6e, 0x19, 0x19, 0xda,
                         0x23, 0x8c, 0xcc, 0xb4, 0x2f, 0x31, 0x64, 0x9d,
                         0x05, 0x29, 0x1c, 0x33, 0x7e, 0x09, 0x1b, 0x0c,
                         0x0e, 0x23, 0xc1, 0xb0, 0x40, 0xcc, 0x31, 0xf7,
                         0x55, 0x66, 0x68, 0xd9, 0xa8, 0xae, 0x74, 0x75,
                         0xf3, 0x46, 0xe9, 0x3a, 0x54, 0x9d, 0xe0, 0x8b,
                         0x7e, 0x6c, 0x63, 0x1c, 0xfa, 0x2f, 0xfd, 0xc9,
                         0xd3, 0xf1, 0xd3, 0xfe, 0x7b, 0x9e, 0x14, 0x95,
                         0xb5, 0xd0, 0xad, 0x9b, 0xee, 0x78, 0x8c, 0x83,
                         0x18, 0x58, 0x7e, 0xa2, 0x23, 0xc1, 0x8b, 0x62,
                         0x94, 0x12, 0xcb, 0xb6, 0x60, 0x69, 0x32, 0xfe,
                         0x98, 0x0e, 0x93, 0xb0, 0x8e, 0x5c, 0xfb, 0x6e,
                         0xdb, 0x9a, 0xc2, 0x9f, 0x8c, 0x5c, 0x43, 0x19,
                         0xeb, 0x4a, 0x52, 0xad, 0x62, 0x2b, 0xdd, 0x9f,
                         0xa3, 0x74, 0xa6, 0x96, 0x61, 0x4d, 0x98, 0x40,
                         0x63, 0xa6, 0xd4, 0xbb, 0x17, 0x11, 0x75, 0xed,
                },
        },
        {
                .desc = "SHA384",
                .ssl_method = TLSv1_2_method,
                .cipher_value = 0x009d,
                .out = {
                         0x00, 0x93, 0xc3, 0xfd, 0xa7, 0xbb, 0xdc, 0x5b,
                         0x13, 0x3a, 0xe6, 0x8b, 0x1b, 0xac, 0xf3, 0xfb,
                         0x3c, 0x9a, 0x78, 0xf6, 0x19, 0xf0, 0x13, 0x0f,
                         0x0d, 0x01, 0x9d, 0xdf, 0x0a, 0x28, 0x38, 0xce,
                         0x1a, 0x9b, 0x43, 0xbe, 0x56, 0x12, 0xa7, 0x16,
                         0x58, 0xe1, 0x8a, 0xe4, 0xc5, 0xbb, 0x10, 0x4c,
                         0x3a, 0xf3, 0x7f, 0xd3, 0xdb, 0xe4, 0xe0, 0x3d,
                         0xcc, 0x83, 0xca, 0xf0, 0xf9, 0x69, 0xcc, 0x70,
                         0x83, 0x32, 0xf6, 0xfc, 0x81, 0x80, 0x02, 0xe8,
                         0x31, 0x1e, 0x7c, 0x3b, 0x34, 0xf7, 0x34, 0xd1,
                         0xcf, 0x2a, 0xc4, 0x36, 0x2f, 0xe9, 0xaa, 0x7f,
                         0x6d, 0x1f, 0x5e, 0x0e, 0x39, 0x05, 0x15, 0xe1,
                         0xa2, 0x9a, 0x4d, 0x97, 0x8c, 0x62, 0x46, 0xf1,
                         0x87, 0x65, 0xd8, 0xe9, 0x14, 0x11, 0xa6, 0x48,
                         0xd7, 0x0e, 0x6e, 0x70, 0xad, 0xfb, 0x3f, 0x36,
                         0x05, 0x76, 0x4b, 0xe4, 0x28, 0x50, 0x4a, 0xf2,
                },
        },
};

#define N_TLS_PRF_TESTS \
    (sizeof(tls_prf_tests) / sizeof(*tls_prf_tests))

#define TLS_PRF_SEED1   "tls prf seed 1"
#define TLS_PRF_SEED2   "tls prf seed 2"
#define TLS_PRF_SEED3   "tls prf seed 3"
#define TLS_PRF_SEED4   "tls prf seed 4"
#define TLS_PRF_SEED5   "tls prf seed 5"
#define TLS_PRF_SECRET  "tls prf secretz"

static void
hexdump(const unsigned char *buf, size_t len)
{
        size_t i;

        for (i = 1; i <= len; i++)
                fprintf(stderr, " 0x%02hhx,%s", buf[i - 1], i % 8 ? "" : "\n");

        fprintf(stderr, "\n");
}

static int
do_tls_prf_test(int test_no, const struct tls_prf_test *tpt)
{
        unsigned char *out = NULL;
        const SSL_CIPHER *cipher;
        SSL_CTX *ssl_ctx = NULL;
        SSL *ssl = NULL;
        int failure = 1;
        int len;

        fprintf(stderr, "Test %d - %s\n", test_no, tpt->desc);

        if ((out = malloc(TLS_PRF_OUT_LEN)) == NULL)
                errx(1, "failed to allocate out");

        if ((ssl_ctx = SSL_CTX_new(tpt->ssl_method())) == NULL)
                errx(1, "failed to create SSL context");
        if ((ssl = SSL_new(ssl_ctx)) == NULL)
                errx(1, "failed to create SSL context");

        if ((cipher = ssl3_get_cipher_by_value(tpt->cipher_value)) == NULL) {
                fprintf(stderr, "FAIL: no cipher %hx\n", tpt->cipher_value);
                goto failure;
        }

        ssl->s3->hs.cipher = cipher;

        for (len = 1; len <= TLS_PRF_OUT_LEN; len++) {
                memset(out, 'A', TLS_PRF_OUT_LEN);

                if (tls1_PRF(ssl, TLS_PRF_SECRET, sizeof(TLS_PRF_SECRET),
                    TLS_PRF_SEED1, sizeof(TLS_PRF_SEED1), TLS_PRF_SEED2,
                    sizeof(TLS_PRF_SEED2), TLS_PRF_SEED3, sizeof(TLS_PRF_SEED3),
                    TLS_PRF_SEED4, sizeof(TLS_PRF_SEED4), TLS_PRF_SEED5,
                    sizeof(TLS_PRF_SEED5), out, len) != 1) {
                        fprintf(stderr, "FAIL: tls_PRF failed for len %d\n",
                            len);
                        goto failure;
                }

                if (memcmp(out, tpt->out, len) != 0) {
                        fprintf(stderr, "FAIL: tls_PRF output differs for "
                            "len %d\n", len);
                        fprintf(stderr, "output:\n");
                        hexdump(out, TLS_PRF_OUT_LEN);
                        fprintf(stderr, "test data:\n");
                        hexdump(tpt->out, TLS_PRF_OUT_LEN);
                        fprintf(stderr, "\n");
                        goto failure;
                }
        }

        failure = 0;

 failure:
        SSL_free(ssl);
        SSL_CTX_free(ssl_ctx);

        free(out);

        return failure;
}

int
main(int argc, char **argv)
{
        int failed = 0;
        size_t i;

        SSL_library_init();
        SSL_load_error_strings();

        for (i = 0; i < N_TLS_PRF_TESTS; i++)
                failed |= do_tls_prf_test(i, &tls_prf_tests[i]);

        return failed;
}