test/srptest.c

   1 /*
   2  * Copyright 2011-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (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 #include <openssl/opensslconf.h>
  11 # include "testutil.h"
  12
  13 #ifdef OPENSSL_NO_SRP
  14 # include <stdio.h>
  15 #else
  16
  17 # include <openssl/srp.h>
  18 # include <openssl/rand.h>
  19 # include <openssl/err.h>
  20
  21 static void showbn(const char *name, const BIGNUM *bn)
  22 {
  23     BIO *b;
  24     const char *text;
  25
  26     if (!TEST_ptr(b = BIO_new(BIO_s_mem())))
  27         return;
  28     BIO_write(b, name, strlen(name));
  29     BIO_write(b, " = ", 3);
  30     BN_print(b, bn);
  31     BIO_write(b, "\0", 1);
  32     BIO_get_mem_data(b, &text);
  33     TEST_info("%s", text);
  34     BIO_free(b);
  35 }
  36
  37 # define RANDOM_SIZE 32         /* use 256 bits on each side */
  38
  39 static int run_srp(const char *username, const char *client_pass,
  40                    const char *server_pass)
  41 {
  42     int ret = 0;
  43     BIGNUM *s = NULL;
  44     BIGNUM *v = NULL;
  45     BIGNUM *a = NULL;
  46     BIGNUM *b = NULL;
  47     BIGNUM *u = NULL;
  48     BIGNUM *x = NULL;
  49     BIGNUM *Apub = NULL;
  50     BIGNUM *Bpub = NULL;
  51     BIGNUM *Kclient = NULL;
  52     BIGNUM *Kserver = NULL;
  53     unsigned char rand_tmp[RANDOM_SIZE];
  54     /* use builtin 1024-bit params */
  55     const SRP_gN *GN;
  56
  57     if (!TEST_ptr(GN = SRP_get_default_gN("1024")))
  58         return 0;
  59
  60     /* Set up server's password entry */
  61     if (!TEST_true(SRP_create_verifier_BN(username, server_pass,
  62                                           &s, &v, GN->N, GN->g)))
  63         goto end;
  64
  65     showbn("N", GN->N);
  66     showbn("g", GN->g);
  67     showbn("Salt", s);
  68     showbn("Verifier", v);
  69
  70     /* Server random */
  71     RAND_bytes(rand_tmp, sizeof(rand_tmp));
  72     b = BN_bin2bn(rand_tmp, sizeof(rand_tmp), NULL);
  73     if (!TEST_BN_ne_zero(b))
  74         goto end;
  75     showbn("b", b);
  76
  77     /* Server's first message */
  78     Bpub = SRP_Calc_B(b, GN->N, GN->g, v);
  79     showbn("B", Bpub);
  80
  81     if (!TEST_true(SRP_Verify_B_mod_N(Bpub, GN->N)))
  82         goto end;
  83
  84     /* Client random */
  85     RAND_bytes(rand_tmp, sizeof(rand_tmp));
  86     a = BN_bin2bn(rand_tmp, sizeof(rand_tmp), NULL);
  87     if (!TEST_BN_ne_zero(a))
  88         goto end;
  89     showbn("a", a);
  90
  91     /* Client's response */
  92     Apub = SRP_Calc_A(a, GN->N, GN->g);
  93     showbn("A", Apub);
  94
  95     if (!TEST_true(SRP_Verify_A_mod_N(Apub, GN->N)))
  96         goto end;
  97
  98     /* Both sides calculate u */
  99     u = SRP_Calc_u(Apub, Bpub, GN->N);
 100
 101     /* Client's key */
 102     x = SRP_Calc_x(s, username, client_pass);
 103     Kclient = SRP_Calc_client_key(GN->N, Bpub, GN->g, x, a, u);
 104     showbn("Client's key", Kclient);
 105
 106     /* Server's key */
 107     Kserver = SRP_Calc_server_key(Apub, v, u, b, GN->N);
 108     showbn("Server's key", Kserver);
 109
 110     if (!TEST_BN_eq(Kclient, Kserver))
 111         goto end;
 112
 113     ret = 1;
 114
 115 end:
 116     BN_clear_free(Kclient);
 117     BN_clear_free(Kserver);
 118     BN_clear_free(x);
 119     BN_free(u);
 120     BN_free(Apub);
 121     BN_clear_free(a);
 122     BN_free(Bpub);
 123     BN_clear_free(b);
 124     BN_free(s);
 125     BN_clear_free(v);
 126
 127     return ret;
 128 }
 129
 130 static int check_bn(const char *name, const BIGNUM *bn, const char *hexbn)
 131 {
 132     BIGNUM *tmp = NULL;
 133     int r;
 134
 135     if (!TEST_true(BN_hex2bn(&tmp, hexbn)))
 136         return 0;
 137
 138     if (BN_cmp(bn, tmp) != 0)
 139         TEST_error("unexpected %s value", name);
 140     r = TEST_BN_eq(bn, tmp);
 141     BN_free(tmp);
 142     return r;
 143 }
 144
 145 /* SRP test vectors from RFC5054 */
 146 static int run_srp_kat(void)
 147 {
 148     int ret = 0;
 149     BIGNUM *s = NULL;
 150     BIGNUM *v = NULL;
 151     BIGNUM *a = NULL;
 152     BIGNUM *b = NULL;
 153     BIGNUM *u = NULL;
 154     BIGNUM *x = NULL;
 155     BIGNUM *Apub = NULL;
 156     BIGNUM *Bpub = NULL;
 157     BIGNUM *Kclient = NULL;
 158     BIGNUM *Kserver = NULL;
 159     /* use builtin 1024-bit params */
 160     const SRP_gN *GN;
 161
 162     if (!TEST_ptr(GN = SRP_get_default_gN("1024")))
 163         goto err;
 164     BN_hex2bn(&s, "BEB25379D1A8581EB5A727673A2441EE");
 165     /* Set up server's password entry */
 166     if (!TEST_true(SRP_create_verifier_BN("alice", "password123", &s, &v, GN->N,
 167                                 GN->g)))
 168         goto err;
 169
 170     if (!TEST_true(check_bn("v", v,
 171                  "7E273DE8696FFC4F4E337D05B4B375BEB0DDE1569E8FA00A9886D812"
 172                  "9BADA1F1822223CA1A605B530E379BA4729FDC59F105B4787E5186F5"
 173                  "C671085A1447B52A48CF1970B4FB6F8400BBF4CEBFBB168152E08AB5"
 174                  "EA53D15C1AFF87B2B9DA6E04E058AD51CC72BFC9033B564E26480D78"
 175                  "E955A5E29E7AB245DB2BE315E2099AFB")))
 176         goto err;
 177
 178     /* Server random */
 179     BN_hex2bn(&b, "E487CB59D31AC550471E81F00F6928E01DDA08E974A004F49E61F5D1"
 180                   "05284D20");
 181
 182     /* Server's first message */
 183     Bpub = SRP_Calc_B(b, GN->N, GN->g, v);
 184     if (!TEST_true(SRP_Verify_B_mod_N(Bpub, GN->N)))
 185         goto err;
 186
 187     if (!TEST_true(check_bn("B", Bpub,
 188                   "BD0C61512C692C0CB6D041FA01BB152D4916A1E77AF46AE105393011"
 189                   "BAF38964DC46A0670DD125B95A981652236F99D9B681CBF87837EC99"
 190                   "6C6DA04453728610D0C6DDB58B318885D7D82C7F8DEB75CE7BD4FBAA"
 191                   "37089E6F9C6059F388838E7A00030B331EB76840910440B1B27AAEAE"
 192                   "EB4012B7D7665238A8E3FB004B117B58")))
 193         goto err;
 194
 195     /* Client random */
 196     BN_hex2bn(&a, "60975527035CF2AD1989806F0407210BC81EDC04E2762A56AFD529DD"
 197                   "DA2D4393");
 198
 199     /* Client's response */
 200     Apub = SRP_Calc_A(a, GN->N, GN->g);
 201     if (!TEST_true(SRP_Verify_A_mod_N(Apub, GN->N)))
 202         goto err;
 203
 204     if (!TEST_true(check_bn("A", Apub,
 205                   "61D5E490F6F1B79547B0704C436F523DD0E560F0C64115BB72557EC4"
 206                   "4352E8903211C04692272D8B2D1A5358A2CF1B6E0BFCF99F921530EC"
 207                   "8E39356179EAE45E42BA92AEACED825171E1E8B9AF6D9C03E1327F44"
 208                   "BE087EF06530E69F66615261EEF54073CA11CF5858F0EDFDFE15EFEA"
 209                   "B349EF5D76988A3672FAC47B0769447B")))
 210         goto err;
 211
 212     /* Both sides calculate u */
 213     u = SRP_Calc_u(Apub, Bpub, GN->N);
 214
 215     if (!TEST_true(check_bn("u", u,
 216                     "CE38B9593487DA98554ED47D70A7AE5F462EF019")))
 217         goto err;
 218
 219     /* Client's key */
 220     x = SRP_Calc_x(s, "alice", "password123");
 221     Kclient = SRP_Calc_client_key(GN->N, Bpub, GN->g, x, a, u);
 222     if (!TEST_true(check_bn("Client's key", Kclient,
 223                   "B0DC82BABCF30674AE450C0287745E7990A3381F63B387AAF271A10D"
 224                   "233861E359B48220F7C4693C9AE12B0A6F67809F0876E2D013800D6C"
 225                   "41BB59B6D5979B5C00A172B4A2A5903A0BDCAF8A709585EB2AFAFA8F"
 226                   "3499B200210DCC1F10EB33943CD67FC88A2F39A4BE5BEC4EC0A3212D"
 227                   "C346D7E474B29EDE8A469FFECA686E5A")))
 228         goto err;
 229
 230     /* Server's key */
 231     Kserver = SRP_Calc_server_key(Apub, v, u, b, GN->N);
 232     if (!TEST_true(check_bn("Server's key", Kserver,
 233                   "B0DC82BABCF30674AE450C0287745E7990A3381F63B387AAF271A10D"
 234                   "233861E359B48220F7C4693C9AE12B0A6F67809F0876E2D013800D6C"
 235                   "41BB59B6D5979B5C00A172B4A2A5903A0BDCAF8A709585EB2AFAFA8F"
 236                   "3499B200210DCC1F10EB33943CD67FC88A2F39A4BE5BEC4EC0A3212D"
 237                   "C346D7E474B29EDE8A469FFECA686E5A")))
 238         goto err;
 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     if (!TEST_false(run_srp("alice", "password1", "password2")))
 261         return 0;
 262
 263     /* "Positive" test, should pass */
 264     if (!TEST_true(run_srp("alice", "password", "password")))
 265         return 0;
 266
 267     return 1;
 268 }
 269 #endif
 270
 271 void register_tests(void)
 272 {
 273 #ifdef OPENSSL_NO_SRP
 274     printf("No SRP support\n");
 275 #else
 276     ADD_TEST(run_srp_tests);
 277     ADD_TEST(run_srp_kat);
 278 #endif
 279 }