test/srptest.c

   1 /*
   2  * Copyright 2011-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /*
  11  * SRP is deprecated, so we're going to have to use some deprecated APIs in
  12  * order to test it.
  13  */
  14 #define OPENSSL_SUPPRESS_DEPRECATED
  15
  16 #include <openssl/opensslconf.h>
  17 # include "testutil.h"
  18
  19 #ifdef OPENSSL_NO_SRP
  20 # include <stdio.h>
  21 #else
  22
  23 # include <openssl/srp.h>
  24 # include <openssl/rand.h>
  25 # include <openssl/err.h>
  26
  27 # define RANDOM_SIZE 32         /* use 256 bits on each side */
  28
  29 static int run_srp(const char *username, const char *client_pass,
  30                    const char *server_pass)
  31 {
  32     int ret = 0;
  33     BIGNUM *s = NULL;
  34     BIGNUM *v = NULL;
  35     BIGNUM *a = NULL;
  36     BIGNUM *b = NULL;
  37     BIGNUM *u = NULL;
  38     BIGNUM *x = NULL;
  39     BIGNUM *Apub = NULL;
  40     BIGNUM *Bpub = NULL;
  41     BIGNUM *Kclient = NULL;
  42     BIGNUM *Kserver = NULL;
  43     unsigned char rand_tmp[RANDOM_SIZE];
  44     /* use builtin 1024-bit params */
  45     const SRP_gN *GN;
  46
  47     if (!TEST_ptr(GN = SRP_get_default_gN("1024")))
  48         return 0;
  49
  50     /* Set up server's password entry */
  51     if (!TEST_true(SRP_create_verifier_BN(username, server_pass,
  52                                           &s, &v, GN->N, GN->g)))
  53         goto end;
  54
  55     test_output_bignum("N", GN->N);
  56     test_output_bignum("g", GN->g);
  57     test_output_bignum("Salt", s);
  58     test_output_bignum("Verifier", v);
  59
  60     /* Server random */
  61     RAND_bytes(rand_tmp, sizeof(rand_tmp));
  62     b = BN_bin2bn(rand_tmp, sizeof(rand_tmp), NULL);
  63     if (!TEST_BN_ne_zero(b))
  64         goto end;
  65     test_output_bignum("b", b);
  66
  67     /* Server's first message */
  68     Bpub = SRP_Calc_B(b, GN->N, GN->g, v);
  69     test_output_bignum("B", Bpub);
  70
  71     if (!TEST_true(SRP_Verify_B_mod_N(Bpub, GN->N)))
  72         goto end;
  73
  74     /* Client random */
  75     RAND_bytes(rand_tmp, sizeof(rand_tmp));
  76     a = BN_bin2bn(rand_tmp, sizeof(rand_tmp), NULL);
  77     if (!TEST_BN_ne_zero(a))
  78         goto end;
  79     test_output_bignum("a", a);
  80
  81     /* Client's response */
  82     Apub = SRP_Calc_A(a, GN->N, GN->g);
  83     test_output_bignum("A", Apub);
  84
  85     if (!TEST_true(SRP_Verify_A_mod_N(Apub, GN->N)))
  86         goto end;
  87
  88     /* Both sides calculate u */
  89     u = SRP_Calc_u(Apub, Bpub, GN->N);
  90
  91     /* Client's key */
  92     x = SRP_Calc_x(s, username, client_pass);
  93     Kclient = SRP_Calc_client_key(GN->N, Bpub, GN->g, x, a, u);
  94     test_output_bignum("Client's key", Kclient);
  95
  96     /* Server's key */
  97     Kserver = SRP_Calc_server_key(Apub, v, u, b, GN->N);
  98     test_output_bignum("Server's key", Kserver);
  99
 100     if (!TEST_BN_eq(Kclient, Kserver))
 101         goto end;
 102
 103     ret = 1;
 104
 105 end:
 106     BN_clear_free(Kclient);
 107     BN_clear_free(Kserver);
 108     BN_clear_free(x);
 109     BN_free(u);
 110     BN_free(Apub);
 111     BN_clear_free(a);
 112     BN_free(Bpub);
 113     BN_clear_free(b);
 114     BN_free(s);
 115     BN_clear_free(v);
 116
 117     return ret;
 118 }
 119
 120 static int check_bn(const char *name, const BIGNUM *bn, const char *hexbn)
 121 {
 122     BIGNUM *tmp = NULL;
 123     int r;
 124
 125     if (!TEST_true(BN_hex2bn(&tmp, hexbn)))
 126         return 0;
 127
 128     if (BN_cmp(bn, tmp) != 0)
 129         TEST_error("unexpected %s value", name);
 130     r = TEST_BN_eq(bn, tmp);
 131     BN_free(tmp);
 132     return r;
 133 }
 134
 135 /* SRP test vectors from RFC5054 */
 136 static int run_srp_kat(void)
 137 {
 138     int ret = 0;
 139     BIGNUM *s = NULL;
 140     BIGNUM *v = NULL;
 141     BIGNUM *a = NULL;
 142     BIGNUM *b = NULL;
 143     BIGNUM *u = NULL;
 144     BIGNUM *x = NULL;
 145     BIGNUM *Apub = NULL;
 146     BIGNUM *Bpub = NULL;
 147     BIGNUM *Kclient = NULL;
 148     BIGNUM *Kserver = NULL;
 149     /* use builtin 1024-bit params */
 150     const SRP_gN *GN;
 151
 152     if (!TEST_ptr(GN = SRP_get_default_gN("1024")))
 153         goto err;
 154     BN_hex2bn(&s, "BEB25379D1A8581EB5A727673A2441EE");
 155     /* Set up server's password entry */
 156     if (!TEST_true(SRP_create_verifier_BN("alice", "password123", &s, &v, GN->N,
 157                                           GN->g)))
 158         goto err;
 159
 160     TEST_info("checking v");
 161     if (!TEST_true(check_bn("v", v,
 162                  "7E273DE8696FFC4F4E337D05B4B375BEB0DDE1569E8FA00A9886D812"
 163                  "9BADA1F1822223CA1A605B530E379BA4729FDC59F105B4787E5186F5"
 164                  "C671085A1447B52A48CF1970B4FB6F8400BBF4CEBFBB168152E08AB5"
 165                  "EA53D15C1AFF87B2B9DA6E04E058AD51CC72BFC9033B564E26480D78"
 166                  "E955A5E29E7AB245DB2BE315E2099AFB")))
 167         goto err;
 168     TEST_note("    okay");
 169
 170     /* Server random */
 171     BN_hex2bn(&b, "E487CB59D31AC550471E81F00F6928E01DDA08E974A004F49E61F5D1"
 172                   "05284D20");
 173
 174     /* Server's first message */
 175     Bpub = SRP_Calc_B(b, GN->N, GN->g, v);
 176     if (!TEST_true(SRP_Verify_B_mod_N(Bpub, GN->N)))
 177         goto err;
 178
 179     TEST_info("checking B");
 180     if (!TEST_true(check_bn("B", Bpub,
 181                   "BD0C61512C692C0CB6D041FA01BB152D4916A1E77AF46AE105393011"
 182                   "BAF38964DC46A0670DD125B95A981652236F99D9B681CBF87837EC99"
 183                   "6C6DA04453728610D0C6DDB58B318885D7D82C7F8DEB75CE7BD4FBAA"
 184                   "37089E6F9C6059F388838E7A00030B331EB76840910440B1B27AAEAE"
 185                   "EB4012B7D7665238A8E3FB004B117B58")))
 186         goto err;
 187     TEST_note("    okay");
 188
 189     /* Client random */
 190     BN_hex2bn(&a, "60975527035CF2AD1989806F0407210BC81EDC04E2762A56AFD529DD"
 191                   "DA2D4393");
 192
 193     /* Client's response */
 194     Apub = SRP_Calc_A(a, GN->N, GN->g);
 195     if (!TEST_true(SRP_Verify_A_mod_N(Apub, GN->N)))
 196         goto err;
 197
 198     TEST_info("checking A");
 199     if (!TEST_true(check_bn("A", Apub,
 200                   "61D5E490F6F1B79547B0704C436F523DD0E560F0C64115BB72557EC4"
 201                   "4352E8903211C04692272D8B2D1A5358A2CF1B6E0BFCF99F921530EC"
 202                   "8E39356179EAE45E42BA92AEACED825171E1E8B9AF6D9C03E1327F44"
 203                   "BE087EF06530E69F66615261EEF54073CA11CF5858F0EDFDFE15EFEA"
 204                   "B349EF5D76988A3672FAC47B0769447B")))
 205         goto err;
 206     TEST_note("    okay");
 207
 208     /* Both sides calculate u */
 209     u = SRP_Calc_u(Apub, Bpub, GN->N);
 210
 211     if (!TEST_true(check_bn("u", u,
 212                     "CE38B9593487DA98554ED47D70A7AE5F462EF019")))
 213         goto err;
 214
 215     /* Client's key */
 216     x = SRP_Calc_x(s, "alice", "password123");
 217     Kclient = SRP_Calc_client_key(GN->N, Bpub, GN->g, x, a, u);
 218     TEST_info("checking client's key");
 219     if (!TEST_true(check_bn("Client's key", Kclient,
 220                   "B0DC82BABCF30674AE450C0287745E7990A3381F63B387AAF271A10D"
 221                   "233861E359B48220F7C4693C9AE12B0A6F67809F0876E2D013800D6C"
 222                   "41BB59B6D5979B5C00A172B4A2A5903A0BDCAF8A709585EB2AFAFA8F"
 223                   "3499B200210DCC1F10EB33943CD67FC88A2F39A4BE5BEC4EC0A3212D"
 224                   "C346D7E474B29EDE8A469FFECA686E5A")))
 225         goto err;
 226     TEST_note("    okay");
 227
 228     /* Server's key */
 229     Kserver = SRP_Calc_server_key(Apub, v, u, b, GN->N);
 230     TEST_info("checking server's key");
 231     if (!TEST_true(check_bn("Server's key", Kserver,
 232                   "B0DC82BABCF30674AE450C0287745E7990A3381F63B387AAF271A10D"
 233                   "233861E359B48220F7C4693C9AE12B0A6F67809F0876E2D013800D6C"
 234                   "41BB59B6D5979B5C00A172B4A2A5903A0BDCAF8A709585EB2AFAFA8F"
 235                   "3499B200210DCC1F10EB33943CD67FC88A2F39A4BE5BEC4EC0A3212D"
 236                   "C346D7E474B29EDE8A469FFECA686E5A")))
 237         goto err;
 238     TEST_note("    okay");
 239
 240     ret = 1;
 241
 242 err:
 243     BN_clear_free(Kclient);
 244     BN_clear_free(Kserver);
 245     BN_clear_free(x);
 246     BN_free(u);
 247     BN_free(Apub);
 248     BN_clear_free(a);
 249     BN_free(Bpub);
 250     BN_clear_free(b);
 251     BN_free(s);
 252     BN_clear_free(v);
 253
 254     return ret;
 255 }
 256
 257 static int run_srp_tests(void)
 258 {
 259     /* "Negative" test, expect a mismatch */
 260     TEST_info("run_srp: expecting a mismatch");
 261     if (!TEST_false(run_srp("alice", "password1", "password2")))
 262         return 0;
 263
 264     /* "Positive" test, should pass */
 265     TEST_info("run_srp: expecting a match");
 266     if (!TEST_true(run_srp("alice", "password", "password")))
 267         return 0;
 268
 269     return 1;
 270 }
 271 #endif
 272
 273 int setup_tests(void)
 274 {
 275 #ifdef OPENSSL_NO_SRP
 276     printf("No SRP support\n");
 277 #else
 278     ADD_TEST(run_srp_tests);
 279     ADD_TEST(run_srp_kat);
 280 #endif
 281     return 1;
 282 }