312 lines
8.5 KiB
C
312 lines
8.5 KiB
C
/*
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* Copyright 2011-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <openssl/opensslconf.h>
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#ifdef OPENSSL_NO_SRP
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# include <stdio.h>
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int main(int argc, char *argv[])
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{
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printf("No SRP support\n");
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return (0);
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}
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#else
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# include <openssl/srp.h>
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# include <openssl/rand.h>
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# include <openssl/err.h>
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static void showbn(const char *name, const BIGNUM *bn)
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{
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fputs(name, stdout);
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fputs(" = ", stdout);
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BN_print_fp(stdout, bn);
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putc('\n', stdout);
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}
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# define RANDOM_SIZE 32 /* use 256 bits on each side */
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static int run_srp(const char *username, const char *client_pass,
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const char *server_pass)
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{
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int ret = -1;
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BIGNUM *s = NULL;
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BIGNUM *v = NULL;
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BIGNUM *a = NULL;
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BIGNUM *b = NULL;
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BIGNUM *u = NULL;
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BIGNUM *x = NULL;
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BIGNUM *Apub = NULL;
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BIGNUM *Bpub = NULL;
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BIGNUM *Kclient = NULL;
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BIGNUM *Kserver = NULL;
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unsigned char rand_tmp[RANDOM_SIZE];
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/* use builtin 1024-bit params */
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const SRP_gN *GN = SRP_get_default_gN("1024");
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if (GN == NULL) {
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fprintf(stderr, "Failed to get SRP parameters\n");
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return -1;
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}
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/* Set up server's password entry */
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if (!SRP_create_verifier_BN(username, server_pass, &s, &v, GN->N, GN->g)) {
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fprintf(stderr, "Failed to create SRP verifier\n");
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return -1;
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}
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showbn("N", GN->N);
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showbn("g", GN->g);
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showbn("Salt", s);
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showbn("Verifier", v);
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/* Server random */
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RAND_bytes(rand_tmp, sizeof(rand_tmp));
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b = BN_bin2bn(rand_tmp, sizeof(rand_tmp), NULL);
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/* TODO - check b != 0 */
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showbn("b", b);
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/* Server's first message */
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Bpub = SRP_Calc_B(b, GN->N, GN->g, v);
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showbn("B", Bpub);
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if (!SRP_Verify_B_mod_N(Bpub, GN->N)) {
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fprintf(stderr, "Invalid B\n");
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return -1;
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}
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/* Client random */
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RAND_bytes(rand_tmp, sizeof(rand_tmp));
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a = BN_bin2bn(rand_tmp, sizeof(rand_tmp), NULL);
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/* TODO - check a != 0 */
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showbn("a", a);
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/* Client's response */
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Apub = SRP_Calc_A(a, GN->N, GN->g);
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showbn("A", Apub);
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if (!SRP_Verify_A_mod_N(Apub, GN->N)) {
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fprintf(stderr, "Invalid A\n");
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return -1;
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}
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/* Both sides calculate u */
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u = SRP_Calc_u(Apub, Bpub, GN->N);
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/* Client's key */
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x = SRP_Calc_x(s, username, client_pass);
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Kclient = SRP_Calc_client_key(GN->N, Bpub, GN->g, x, a, u);
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showbn("Client's key", Kclient);
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/* Server's key */
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Kserver = SRP_Calc_server_key(Apub, v, u, b, GN->N);
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showbn("Server's key", Kserver);
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if (BN_cmp(Kclient, Kserver) == 0) {
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ret = 0;
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} else {
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fprintf(stderr, "Keys mismatch\n");
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ret = 1;
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}
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BN_clear_free(Kclient);
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BN_clear_free(Kserver);
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BN_clear_free(x);
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BN_free(u);
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BN_free(Apub);
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BN_clear_free(a);
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BN_free(Bpub);
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BN_clear_free(b);
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BN_free(s);
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BN_clear_free(v);
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return ret;
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}
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static int check_bn(const char *name, const BIGNUM *bn, const char *hexbn)
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{
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BIGNUM *tmp = NULL;
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int rv;
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if (BN_hex2bn(&tmp, hexbn) == 0)
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return 0;
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rv = BN_cmp(bn, tmp);
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if (rv == 0) {
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printf("%s = ", name);
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BN_print_fp(stdout, bn);
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printf("\n");
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BN_free(tmp);
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return 1;
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}
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printf("Unexpected %s value\n", name);
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printf("Expecting: ");
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BN_print_fp(stdout, tmp);
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printf("\nReceived: ");
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BN_print_fp(stdout, bn);
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printf("\n");
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BN_free(tmp);
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return 0;
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}
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/* SRP test vectors from RFC5054 */
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static int run_srp_kat(void)
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{
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int ret = 0;
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BIGNUM *s = NULL;
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BIGNUM *v = NULL;
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BIGNUM *a = NULL;
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BIGNUM *b = NULL;
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BIGNUM *u = NULL;
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BIGNUM *x = NULL;
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BIGNUM *Apub = NULL;
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BIGNUM *Bpub = NULL;
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BIGNUM *Kclient = NULL;
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BIGNUM *Kserver = NULL;
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/* use builtin 1024-bit params */
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const SRP_gN *GN = SRP_get_default_gN("1024");
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if (GN == NULL) {
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fprintf(stderr, "Failed to get SRP parameters\n");
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goto err;
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}
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BN_hex2bn(&s, "BEB25379D1A8581EB5A727673A2441EE");
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/* Set up server's password entry */
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if (!SRP_create_verifier_BN("alice", "password123", &s, &v, GN->N,
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GN->g)) {
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fprintf(stderr, "Failed to create SRP verifier\n");
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goto err;
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}
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if (!check_bn("v", v,
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"7E273DE8696FFC4F4E337D05B4B375BEB0DDE1569E8FA00A9886D812"
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"9BADA1F1822223CA1A605B530E379BA4729FDC59F105B4787E5186F5"
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"C671085A1447B52A48CF1970B4FB6F8400BBF4CEBFBB168152E08AB5"
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"EA53D15C1AFF87B2B9DA6E04E058AD51CC72BFC9033B564E26480D78"
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"E955A5E29E7AB245DB2BE315E2099AFB"))
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goto err;
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/* Server random */
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BN_hex2bn(&b, "E487CB59D31AC550471E81F00F6928E01DDA08E974A004F49E61F5D1"
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"05284D20");
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/* Server's first message */
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Bpub = SRP_Calc_B(b, GN->N, GN->g, v);
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if (!SRP_Verify_B_mod_N(Bpub, GN->N)) {
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fprintf(stderr, "Invalid B\n");
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goto err;
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}
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if (!check_bn("B", Bpub,
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"BD0C61512C692C0CB6D041FA01BB152D4916A1E77AF46AE105393011"
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"BAF38964DC46A0670DD125B95A981652236F99D9B681CBF87837EC99"
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"6C6DA04453728610D0C6DDB58B318885D7D82C7F8DEB75CE7BD4FBAA"
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"37089E6F9C6059F388838E7A00030B331EB76840910440B1B27AAEAE"
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"EB4012B7D7665238A8E3FB004B117B58"))
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goto err;
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/* Client random */
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BN_hex2bn(&a, "60975527035CF2AD1989806F0407210BC81EDC04E2762A56AFD529DD"
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"DA2D4393");
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/* Client's response */
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Apub = SRP_Calc_A(a, GN->N, GN->g);
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if (!SRP_Verify_A_mod_N(Apub, GN->N)) {
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fprintf(stderr, "Invalid A\n");
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return -1;
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}
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if (!check_bn("A", Apub,
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"61D5E490F6F1B79547B0704C436F523DD0E560F0C64115BB72557EC4"
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"4352E8903211C04692272D8B2D1A5358A2CF1B6E0BFCF99F921530EC"
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"8E39356179EAE45E42BA92AEACED825171E1E8B9AF6D9C03E1327F44"
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"BE087EF06530E69F66615261EEF54073CA11CF5858F0EDFDFE15EFEA"
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"B349EF5D76988A3672FAC47B0769447B"))
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goto err;
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/* Both sides calculate u */
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u = SRP_Calc_u(Apub, Bpub, GN->N);
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if (!check_bn("u", u, "CE38B9593487DA98554ED47D70A7AE5F462EF019"))
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goto err;
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/* Client's key */
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x = SRP_Calc_x(s, "alice", "password123");
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Kclient = SRP_Calc_client_key(GN->N, Bpub, GN->g, x, a, u);
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if (!check_bn("Client's key", Kclient,
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"B0DC82BABCF30674AE450C0287745E7990A3381F63B387AAF271A10D"
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"233861E359B48220F7C4693C9AE12B0A6F67809F0876E2D013800D6C"
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"41BB59B6D5979B5C00A172B4A2A5903A0BDCAF8A709585EB2AFAFA8F"
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"3499B200210DCC1F10EB33943CD67FC88A2F39A4BE5BEC4EC0A3212D"
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"C346D7E474B29EDE8A469FFECA686E5A"))
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goto err;
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/* Server's key */
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Kserver = SRP_Calc_server_key(Apub, v, u, b, GN->N);
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if (!check_bn("Server's key", Kserver,
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"B0DC82BABCF30674AE450C0287745E7990A3381F63B387AAF271A10D"
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"233861E359B48220F7C4693C9AE12B0A6F67809F0876E2D013800D6C"
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"41BB59B6D5979B5C00A172B4A2A5903A0BDCAF8A709585EB2AFAFA8F"
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"3499B200210DCC1F10EB33943CD67FC88A2F39A4BE5BEC4EC0A3212D"
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"C346D7E474B29EDE8A469FFECA686E5A"))
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goto err;
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ret = 1;
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err:
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BN_clear_free(Kclient);
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BN_clear_free(Kserver);
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BN_clear_free(x);
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BN_free(u);
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BN_free(Apub);
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BN_clear_free(a);
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BN_free(Bpub);
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BN_clear_free(b);
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BN_free(s);
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BN_clear_free(v);
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return ret;
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}
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int main(int argc, char **argv)
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{
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BIO *bio_err;
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bio_err = BIO_new_fp(stderr, BIO_NOCLOSE | BIO_FP_TEXT);
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CRYPTO_set_mem_debug(1);
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CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
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/* "Negative" test, expect a mismatch */
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if (run_srp("alice", "password1", "password2") == 0) {
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fprintf(stderr, "Mismatched SRP run failed\n");
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return 1;
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}
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/* "Positive" test, should pass */
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if (run_srp("alice", "password", "password") != 0) {
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fprintf(stderr, "Plain SRP run failed\n");
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return 1;
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}
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/* KAT from RFC5054: should pass */
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if (run_srp_kat() != 1) {
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fprintf(stderr, "SRP KAT failed\n");
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return 1;
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}
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#ifndef OPENSSL_NO_CRYPTO_MDEBUG
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if (CRYPTO_mem_leaks(bio_err) <= 0)
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return 1;
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#endif
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BIO_free(bio_err);
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return 0;
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}
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#endif
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