srptest.c
/*
* Copyright 2011-2017 The OpenSSL Project Authors. 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 <openssl/opensslconf.h>
# include "testutil.h"
#ifdef OPENSSL_NO_SRP
# include <stdio.h>
#else
# include <openssl/srp.h>
# include <openssl/rand.h>
# include <openssl/err.h>
# define RANDOM_SIZE 32 /* use 256 bits on each side */
static int run_srp(const char *username, const char *client_pass,
const char *server_pass)
{
int ret = 0;
BIGNUM *s = NULL;
BIGNUM *v = NULL;
BIGNUM *a = NULL;
BIGNUM *b = NULL;
BIGNUM *u = NULL;
BIGNUM *x = NULL;
BIGNUM *Apub = NULL;
BIGNUM *Bpub = NULL;
BIGNUM *Kclient = NULL;
BIGNUM *Kserver = NULL;
unsigned char rand_tmp[RANDOM_SIZE];
/* use builtin 1024-bit params */
const SRP_gN *GN;
if (!TEST_ptr(GN = SRP_get_default_gN("1024")))
return 0;
/* Set up server's password entry */
if (!TEST_true(SRP_create_verifier_BN(username, server_pass,
&s, &v, GN->N, GN->g)))
goto end;
test_output_bignum("N", GN->N);
test_output_bignum("g", GN->g);
test_output_bignum("Salt", s);
test_output_bignum("Verifier", v);
/* Server random */
RAND_bytes(rand_tmp, sizeof(rand_tmp));
b = BN_bin2bn(rand_tmp, sizeof(rand_tmp), NULL);
if (!TEST_BN_ne_zero(b))
goto end;
test_output_bignum("b", b);
/* Server's first message */
Bpub = SRP_Calc_B(b, GN->N, GN->g, v);
test_output_bignum("B", Bpub);
if (!TEST_true(SRP_Verify_B_mod_N(Bpub, GN->N)))
goto end;
/* Client random */
RAND_bytes(rand_tmp, sizeof(rand_tmp));
a = BN_bin2bn(rand_tmp, sizeof(rand_tmp), NULL);
if (!TEST_BN_ne_zero(a))
goto end;
test_output_bignum("a", a);
/* Client's response */
Apub = SRP_Calc_A(a, GN->N, GN->g);
test_output_bignum("A", Apub);
if (!TEST_true(SRP_Verify_A_mod_N(Apub, GN->N)))
goto end;
/* Both sides calculate u */
u = SRP_Calc_u(Apub, Bpub, GN->N);
/* Client's key */
x = SRP_Calc_x(s, username, client_pass);
Kclient = SRP_Calc_client_key(GN->N, Bpub, GN->g, x, a, u);
test_output_bignum("Client's key", Kclient);
/* Server's key */
Kserver = SRP_Calc_server_key(Apub, v, u, b, GN->N);
test_output_bignum("Server's key", Kserver);
if (!TEST_BN_eq(Kclient, Kserver))
goto end;
ret = 1;
end:
BN_clear_free(Kclient);
BN_clear_free(Kserver);
BN_clear_free(x);
BN_free(u);
BN_free(Apub);
BN_clear_free(a);
BN_free(Bpub);
BN_clear_free(b);
BN_free(s);
BN_clear_free(v);
return ret;
}
static int check_bn(const char *name, const BIGNUM *bn, const char *hexbn)
{
BIGNUM *tmp = NULL;
int r;
if (!TEST_true(BN_hex2bn(&tmp, hexbn)))
return 0;
if (BN_cmp(bn, tmp) != 0)
TEST_error("unexpected %s value", name);
r = TEST_BN_eq(bn, tmp);
BN_free(tmp);
return r;
}
/* SRP test vectors from RFC5054 */
static int run_srp_kat(void)
{
int ret = 0;
BIGNUM *s = NULL;
BIGNUM *v = NULL;
BIGNUM *a = NULL;
BIGNUM *b = NULL;
BIGNUM *u = NULL;
BIGNUM *x = NULL;
BIGNUM *Apub = NULL;
BIGNUM *Bpub = NULL;
BIGNUM *Kclient = NULL;
BIGNUM *Kserver = NULL;
/* use builtin 1024-bit params */
const SRP_gN *GN;
if (!TEST_ptr(GN = SRP_get_default_gN("1024")))
goto err;
BN_hex2bn(&s, "BEB25379D1A8581EB5A727673A2441EE");
/* Set up server's password entry */
if (!TEST_true(SRP_create_verifier_BN("alice", "password123", &s, &v, GN->N,
GN->g)))
goto err;
TEST_info("checking v");
if (!TEST_true(check_bn("v", v,
"7E273DE8696FFC4F4E337D05B4B375BEB0DDE1569E8FA00A9886D812"
"9BADA1F1822223CA1A605B530E379BA4729FDC59F105B4787E5186F5"
"C671085A1447B52A48CF1970B4FB6F8400BBF4CEBFBB168152E08AB5"
"EA53D15C1AFF87B2B9DA6E04E058AD51CC72BFC9033B564E26480D78"
"E955A5E29E7AB245DB2BE315E2099AFB")))
goto err;
TEST_note(" okay");
/* Server random */
BN_hex2bn(&b, "E487CB59D31AC550471E81F00F6928E01DDA08E974A004F49E61F5D1"
"05284D20");
/* Server's first message */
Bpub = SRP_Calc_B(b, GN->N, GN->g, v);
if (!TEST_true(SRP_Verify_B_mod_N(Bpub, GN->N)))
goto err;
TEST_info("checking B");
if (!TEST_true(check_bn("B", Bpub,
"BD0C61512C692C0CB6D041FA01BB152D4916A1E77AF46AE105393011"
"BAF38964DC46A0670DD125B95A981652236F99D9B681CBF87837EC99"
"6C6DA04453728610D0C6DDB58B318885D7D82C7F8DEB75CE7BD4FBAA"
"37089E6F9C6059F388838E7A00030B331EB76840910440B1B27AAEAE"
"EB4012B7D7665238A8E3FB004B117B58")))
goto err;
TEST_note(" okay");
/* Client random */
BN_hex2bn(&a, "60975527035CF2AD1989806F0407210BC81EDC04E2762A56AFD529DD"
"DA2D4393");
/* Client's response */
Apub = SRP_Calc_A(a, GN->N, GN->g);
if (!TEST_true(SRP_Verify_A_mod_N(Apub, GN->N)))
goto err;
TEST_info("checking A");
if (!TEST_true(check_bn("A", Apub,
"61D5E490F6F1B79547B0704C436F523DD0E560F0C64115BB72557EC4"
"4352E8903211C04692272D8B2D1A5358A2CF1B6E0BFCF99F921530EC"
"8E39356179EAE45E42BA92AEACED825171E1E8B9AF6D9C03E1327F44"
"BE087EF06530E69F66615261EEF54073CA11CF5858F0EDFDFE15EFEA"
"B349EF5D76988A3672FAC47B0769447B")))
goto err;
TEST_note(" okay");
/* Both sides calculate u */
u = SRP_Calc_u(Apub, Bpub, GN->N);
if (!TEST_true(check_bn("u", u,
"CE38B9593487DA98554ED47D70A7AE5F462EF019")))
goto err;
/* Client's key */
x = SRP_Calc_x(s, "alice", "password123");
Kclient = SRP_Calc_client_key(GN->N, Bpub, GN->g, x, a, u);
TEST_info("checking client's key");
if (!TEST_true(check_bn("Client's key", Kclient,
"B0DC82BABCF30674AE450C0287745E7990A3381F63B387AAF271A10D"
"233861E359B48220F7C4693C9AE12B0A6F67809F0876E2D013800D6C"
"41BB59B6D5979B5C00A172B4A2A5903A0BDCAF8A709585EB2AFAFA8F"
"3499B200210DCC1F10EB33943CD67FC88A2F39A4BE5BEC4EC0A3212D"
"C346D7E474B29EDE8A469FFECA686E5A")))
goto err;
TEST_note(" okay");
/* Server's key */
Kserver = SRP_Calc_server_key(Apub, v, u, b, GN->N);
TEST_info("checking server's key");
if (!TEST_true(check_bn("Server's key", Kserver,
"B0DC82BABCF30674AE450C0287745E7990A3381F63B387AAF271A10D"
"233861E359B48220F7C4693C9AE12B0A6F67809F0876E2D013800D6C"
"41BB59B6D5979B5C00A172B4A2A5903A0BDCAF8A709585EB2AFAFA8F"
"3499B200210DCC1F10EB33943CD67FC88A2F39A4BE5BEC4EC0A3212D"
"C346D7E474B29EDE8A469FFECA686E5A")))
goto err;
TEST_note(" okay");
ret = 1;
err:
BN_clear_free(Kclient);
BN_clear_free(Kserver);
BN_clear_free(x);
BN_free(u);
BN_free(Apub);
BN_clear_free(a);
BN_free(Bpub);
BN_clear_free(b);
BN_free(s);
BN_clear_free(v);
return ret;
}
static int run_srp_tests(void)
{
/* "Negative" test, expect a mismatch */
TEST_info("run_srp: expecting a mismatch");
if (!TEST_false(run_srp("alice", "password1", "password2")))
return 0;
/* "Positive" test, should pass */
TEST_info("run_srp: expecting a match");
if (!TEST_true(run_srp("alice", "password", "password")))
return 0;
return 1;
}
#endif
int setup_tests(void)
{
#ifdef OPENSSL_NO_SRP
printf("No SRP support\n");
#else
ADD_TEST(run_srp_tests);
ADD_TEST(run_srp_kat);
#endif
return 1;
}