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 #ifdef OPENSSL_NO_SRP
  12
  13 # include <stdio.h>
  14
  15 int main(int argc, char *argv[])
  16 {
  17     printf("No SRP support\n");
  18     return (0);
  19 }
  20
  21 #else
  22
  23 # include <openssl/srp.h>
  24 # include <openssl/rand.h>
  25 # include <openssl/err.h>
  26
  27 static void showbn(const char *name, const BIGNUM *bn)
  28 {
  29     fputs(name, stdout);
  30     fputs(" = ", stdout);
  31     BN_print_fp(stdout, bn);
  32     putc('\n', stdout);
  33 }
  34
  35 # define RANDOM_SIZE 32         /* use 256 bits on each side */
  36
  37 static int run_srp(const char *username, const char *client_pass,
  38                    const char *server_pass)
  39 {
  40     int ret = -1;
  41     BIGNUM *s = NULL;
  42     BIGNUM *v = NULL;
  43     BIGNUM *a = NULL;
  44     BIGNUM *b = NULL;
  45     BIGNUM *u = NULL;
  46     BIGNUM *x = NULL;
  47     BIGNUM *Apub = NULL;
  48     BIGNUM *Bpub = NULL;
  49     BIGNUM *Kclient = NULL;
  50     BIGNUM *Kserver = NULL;
  51     unsigned char rand_tmp[RANDOM_SIZE];
  52     /* use builtin 1024-bit params */
  53     const SRP_gN *GN = SRP_get_default_gN("1024");
  54
  55     if (GN == NULL) {
  56         fprintf(stderr, "Failed to get SRP parameters\n");
  57         return -1;
  58     }
  59     /* Set up server's password entry */
  60     if (!SRP_create_verifier_BN(username, server_pass, &s, &v, GN->N, GN->g)) {
  61         fprintf(stderr, "Failed to create SRP verifier\n");
  62         return -1;
  63     }
  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     /* TODO - check b != 0 */
  74     showbn("b", b);
  75
  76     /* Server's first message */
  77     Bpub = SRP_Calc_B(b, GN->N, GN->g, v);
  78     showbn("B", Bpub);
  79
  80     if (!SRP_Verify_B_mod_N(Bpub, GN->N)) {
  81         fprintf(stderr, "Invalid B\n");
  82         return -1;
  83     }
  84
  85     /* Client random */
  86     RAND_bytes(rand_tmp, sizeof(rand_tmp));
  87     a = BN_bin2bn(rand_tmp, sizeof(rand_tmp), NULL);
  88     /* TODO - check a != 0 */
  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 (!SRP_Verify_A_mod_N(Apub, GN->N)) {
  96         fprintf(stderr, "Invalid A\n");
  97         return -1;
  98     }
  99
 100     /* Both sides calculate u */
 101     u = SRP_Calc_u(Apub, Bpub, GN->N);
 102
 103     /* Client's key */
 104     x = SRP_Calc_x(s, username, client_pass);
 105     Kclient = SRP_Calc_client_key(GN->N, Bpub, GN->g, x, a, u);
 106     showbn("Client's key", Kclient);
 107
 108     /* Server's key */
 109     Kserver = SRP_Calc_server_key(Apub, v, u, b, GN->N);
 110     showbn("Server's key", Kserver);
 111
 112     if (BN_cmp(Kclient, Kserver) == 0) {
 113         ret = 0;
 114     } else {
 115         fprintf(stderr, "Keys mismatch\n");
 116         ret = 1;
 117     }
 118
 119     BN_clear_free(Kclient);
 120     BN_clear_free(Kserver);
 121     BN_clear_free(x);
 122     BN_free(u);
 123     BN_free(Apub);
 124     BN_clear_free(a);
 125     BN_free(Bpub);
 126     BN_clear_free(b);
 127     BN_free(s);
 128     BN_clear_free(v);
 129
 130     return ret;
 131 }
 132
 133 static int check_bn(const char *name, const BIGNUM *bn, const char *hexbn)
 134 {
 135     BIGNUM *tmp = NULL;
 136     int rv;
 137     if (BN_hex2bn(&tmp, hexbn) == 0)
 138         return 0;
 139     rv = BN_cmp(bn, tmp);
 140     if (rv == 0) {
 141         printf("%s = ", name);
 142         BN_print_fp(stdout, bn);
 143         printf("\n");
 144         BN_free(tmp);
 145         return 1;
 146     }
 147     printf("Unexpected %s value\n", name);
 148     printf("Expecting: ");
 149     BN_print_fp(stdout, tmp);
 150     printf("\nReceived: ");
 151     BN_print_fp(stdout, bn);
 152     printf("\n");
 153     BN_free(tmp);
 154     return 0;
 155 }
 156
 157 /* SRP test vectors from RFC5054 */
 158 static int run_srp_kat(void)
 159 {
 160     int ret = 0;
 161     BIGNUM *s = NULL;
 162     BIGNUM *v = NULL;
 163     BIGNUM *a = NULL;
 164     BIGNUM *b = NULL;
 165     BIGNUM *u = NULL;
 166     BIGNUM *x = NULL;
 167     BIGNUM *Apub = NULL;
 168     BIGNUM *Bpub = NULL;
 169     BIGNUM *Kclient = NULL;
 170     BIGNUM *Kserver = NULL;
 171     /* use builtin 1024-bit params */
 172     const SRP_gN *GN = SRP_get_default_gN("1024");
 173
 174     if (GN == NULL) {
 175         fprintf(stderr, "Failed to get SRP parameters\n");
 176         goto err;
 177     }
 178     BN_hex2bn(&s, "BEB25379D1A8581EB5A727673A2441EE");
 179     /* Set up server's password entry */
 180     if (!SRP_create_verifier_BN("alice", "password123", &s, &v, GN->N,
 181                                 GN->g)) {
 182         fprintf(stderr, "Failed to create SRP verifier\n");
 183         goto err;
 184     }
 185
 186     if (!check_bn("v", v,
 187                  "7E273DE8696FFC4F4E337D05B4B375BEB0DDE1569E8FA00A9886D812"
 188                  "9BADA1F1822223CA1A605B530E379BA4729FDC59F105B4787E5186F5"
 189                  "C671085A1447B52A48CF1970B4FB6F8400BBF4CEBFBB168152E08AB5"
 190                  "EA53D15C1AFF87B2B9DA6E04E058AD51CC72BFC9033B564E26480D78"
 191                  "E955A5E29E7AB245DB2BE315E2099AFB"))
 192         goto err;
 193
 194     /* Server random */
 195     BN_hex2bn(&b, "E487CB59D31AC550471E81F00F6928E01DDA08E974A004F49E61F5D1"
 196                   "05284D20");
 197
 198     /* Server's first message */
 199     Bpub = SRP_Calc_B(b, GN->N, GN->g, v);
 200
 201     if (!SRP_Verify_B_mod_N(Bpub, GN->N)) {
 202         fprintf(stderr, "Invalid B\n");
 203         goto err;
 204     }
 205
 206     if (!check_bn("B", Bpub,
 207                   "BD0C61512C692C0CB6D041FA01BB152D4916A1E77AF46AE105393011"
 208                   "BAF38964DC46A0670DD125B95A981652236F99D9B681CBF87837EC99"
 209                   "6C6DA04453728610D0C6DDB58B318885D7D82C7F8DEB75CE7BD4FBAA"
 210                   "37089E6F9C6059F388838E7A00030B331EB76840910440B1B27AAEAE"
 211                   "EB4012B7D7665238A8E3FB004B117B58"))
 212         goto err;
 213
 214     /* Client random */
 215     BN_hex2bn(&a, "60975527035CF2AD1989806F0407210BC81EDC04E2762A56AFD529DD"
 216                   "DA2D4393");
 217
 218     /* Client's response */
 219     Apub = SRP_Calc_A(a, GN->N, GN->g);
 220
 221     if (!SRP_Verify_A_mod_N(Apub, GN->N)) {
 222         fprintf(stderr, "Invalid A\n");
 223         return -1;
 224     }
 225
 226     if (!check_bn("A", Apub,
 227                   "61D5E490F6F1B79547B0704C436F523DD0E560F0C64115BB72557EC4"
 228                   "4352E8903211C04692272D8B2D1A5358A2CF1B6E0BFCF99F921530EC"
 229                   "8E39356179EAE45E42BA92AEACED825171E1E8B9AF6D9C03E1327F44"
 230                   "BE087EF06530E69F66615261EEF54073CA11CF5858F0EDFDFE15EFEA"
 231                   "B349EF5D76988A3672FAC47B0769447B"))
 232         goto err;
 233
 234     /* Both sides calculate u */
 235     u = SRP_Calc_u(Apub, Bpub, GN->N);
 236
 237     if (!check_bn("u", u, "CE38B9593487DA98554ED47D70A7AE5F462EF019"))
 238         goto err;
 239
 240     /* Client's key */
 241     x = SRP_Calc_x(s, "alice", "password123");
 242     Kclient = SRP_Calc_client_key(GN->N, Bpub, GN->g, x, a, u);
 243     if (!check_bn("Client's key", Kclient,
 244                   "B0DC82BABCF30674AE450C0287745E7990A3381F63B387AAF271A10D"
 245                   "233861E359B48220F7C4693C9AE12B0A6F67809F0876E2D013800D6C"
 246                   "41BB59B6D5979B5C00A172B4A2A5903A0BDCAF8A709585EB2AFAFA8F"
 247                   "3499B200210DCC1F10EB33943CD67FC88A2F39A4BE5BEC4EC0A3212D"
 248                   "C346D7E474B29EDE8A469FFECA686E5A"))
 249         goto err;
 250     /* Server's key */
 251     Kserver = SRP_Calc_server_key(Apub, v, u, b, GN->N);
 252     if (!check_bn("Server's key", Kserver,
 253                   "B0DC82BABCF30674AE450C0287745E7990A3381F63B387AAF271A10D"
 254                   "233861E359B48220F7C4693C9AE12B0A6F67809F0876E2D013800D6C"
 255                   "41BB59B6D5979B5C00A172B4A2A5903A0BDCAF8A709585EB2AFAFA8F"
 256                   "3499B200210DCC1F10EB33943CD67FC88A2F39A4BE5BEC4EC0A3212D"
 257                   "C346D7E474B29EDE8A469FFECA686E5A"))
 258         goto err;
 259
 260     ret = 1;
 261
 262     err:
 263     BN_clear_free(Kclient);
 264     BN_clear_free(Kserver);
 265     BN_clear_free(x);
 266     BN_free(u);
 267     BN_free(Apub);
 268     BN_clear_free(a);
 269     BN_free(Bpub);
 270     BN_clear_free(b);
 271     BN_free(s);
 272     BN_clear_free(v);
 273
 274     return ret;
 275 }
 276
 277 int main(int argc, char **argv)
 278 {
 279     BIO *bio_err;
 280     bio_err = BIO_new_fp(stderr, BIO_NOCLOSE | BIO_FP_TEXT);
 281
 282     CRYPTO_set_mem_debug(1);
 283     CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
 284
 285
 286     /* "Negative" test, expect a mismatch */
 287     if (run_srp("alice", "password1", "password2") == 0) {
 288         fprintf(stderr, "Mismatched SRP run failed\n");
 289         return 1;
 290     }
 291
 292     /* "Positive" test, should pass */
 293     if (run_srp("alice", "password", "password") != 0) {
 294         fprintf(stderr, "Plain SRP run failed\n");
 295         return 1;
 296     }
 297
 298     /* KAT from RFC5054: should pass */
 299     if (run_srp_kat() != 1) {
 300         fprintf(stderr, "SRP KAT failed\n");
 301         return 1;
 302     }
 303
 304 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
 305     if (CRYPTO_mem_leaks(bio_err) <= 0)
 306         return 1;
 307 #endif
 308     BIO_free(bio_err);
 309
 310     return 0;
 311 }
 312 #endif