xref: /openssl/test/srptest.c (revision a28d06f3)
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 
run_srp(const char * username,const char * client_pass,const char * server_pass)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 
check_bn(const char * name,const BIGNUM * bn,const char * hexbn)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 */
run_srp_kat(void)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 
run_srp_tests(void)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 
setup_tests(void)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 }
283