1 /*
2 * Copyright 2018-2020 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 * DSA low level APIs are deprecated for public use, but still ok for
12 * internal use.
13 */
14 #include "internal/deprecated.h"
15
16 #include <stdlib.h>
17 #include <string.h>
18
19 #include "testutil.h"
20
21 #include <openssl/evp.h>
22 #include <openssl/err.h>
23 #include <openssl/rand.h>
24
25 #ifndef OPENSSL_NO_DSA
26 #include <openssl/dsa.h>
27
28 static DSA *dsakey;
29
30 /*
31 * These parameters are from test/recipes/04-test_pem_data/dsaparam.pem,
32 * converted using dsaparam -C
33 */
load_dsa_params(void)34 static DSA *load_dsa_params(void)
35 {
36 static unsigned char dsap_2048[] = {
37 0xAE, 0x35, 0x7D, 0x4E, 0x1D, 0x96, 0xE2, 0x9F, 0x00, 0x96,
38 0x60, 0x5A, 0x6E, 0x4D, 0x07, 0x8D, 0xA5, 0x7C, 0xBC, 0xF9,
39 0xAD, 0xD7, 0x9F, 0xD5, 0xE9, 0xEE, 0xA6, 0x33, 0x51, 0xDE,
40 0x7B, 0x72, 0xD2, 0x75, 0xAA, 0x71, 0x77, 0xF1, 0x63, 0xFB,
41 0xB6, 0xEC, 0x5A, 0xBA, 0x0D, 0x72, 0xA2, 0x1A, 0x1C, 0x64,
42 0xB8, 0xE5, 0x89, 0x09, 0x6D, 0xC9, 0x6F, 0x0B, 0x7F, 0xD2,
43 0xCE, 0x9F, 0xEF, 0x87, 0x5A, 0xB6, 0x67, 0x2F, 0xEF, 0xEE,
44 0xEB, 0x59, 0xF5, 0x5E, 0xFF, 0xA8, 0x28, 0x84, 0x9E, 0x5B,
45 0x37, 0x09, 0x11, 0x80, 0x7C, 0x08, 0x5C, 0xD5, 0xE1, 0x48,
46 0x4B, 0xD2, 0x68, 0xFB, 0x3F, 0x9F, 0x2B, 0x6B, 0x6C, 0x0D,
47 0x48, 0x1B, 0x1A, 0x80, 0xC2, 0xEB, 0x11, 0x1B, 0x37, 0x79,
48 0xD6, 0x8C, 0x8B, 0x72, 0x3E, 0x67, 0xA5, 0x05, 0x0E, 0x41,
49 0x8A, 0x9E, 0x35, 0x50, 0xB4, 0xD2, 0x40, 0x27, 0x6B, 0xFD,
50 0xE0, 0x64, 0x6B, 0x5B, 0x38, 0x42, 0x94, 0xB5, 0x49, 0xDA,
51 0xEF, 0x6E, 0x78, 0x37, 0xCD, 0x30, 0x89, 0xC3, 0x45, 0x50,
52 0x7B, 0x9C, 0x8C, 0xE7, 0x1C, 0x98, 0x70, 0x71, 0x5D, 0x79,
53 0x5F, 0xEF, 0xE8, 0x94, 0x85, 0x53, 0x3E, 0xEF, 0xA3, 0x2C,
54 0xCE, 0x1A, 0xAB, 0x7D, 0xD6, 0x5E, 0x14, 0xCD, 0x51, 0x54,
55 0x89, 0x9D, 0x77, 0xE4, 0xF8, 0x22, 0xF0, 0x35, 0x10, 0x75,
56 0x05, 0x71, 0x51, 0x4F, 0x8C, 0x4C, 0x5C, 0x0D, 0x2C, 0x2C,
57 0xBE, 0x6C, 0x34, 0xEE, 0x12, 0x82, 0x87, 0x03, 0x19, 0x06,
58 0x12, 0xA8, 0xAA, 0xF4, 0x0D, 0x3C, 0x49, 0xCC, 0x70, 0x5A,
59 0xD8, 0x32, 0xEE, 0x32, 0x50, 0x85, 0x70, 0xE8, 0x18, 0xFD,
60 0x74, 0x80, 0x53, 0x32, 0x57, 0xEE, 0x50, 0xC9, 0xAE, 0xEB,
61 0xAE, 0xB6, 0x22, 0x32, 0x16, 0x6B, 0x8C, 0x59, 0xDA, 0xEE,
62 0x1D, 0x33, 0xDF, 0x4C, 0xA2, 0x3D
63 };
64 static unsigned char dsaq_2048[] = {
65 0xAD, 0x2D, 0x6E, 0x17, 0xB0, 0xF3, 0xEB, 0xC7, 0xB8, 0xEE,
66 0x95, 0x78, 0xF2, 0x17, 0xF5, 0x33, 0x01, 0x67, 0xBC, 0xDE,
67 0x93, 0xFF, 0xEE, 0x40, 0xE8, 0x7F, 0xF1, 0x93, 0x6D, 0x4B,
68 0x87, 0x13
69 };
70 static unsigned char dsag_2048[] = {
71 0x66, 0x6F, 0xDA, 0x63, 0xA5, 0x8E, 0xD2, 0x4C, 0xD5, 0x45,
72 0x2D, 0x76, 0x5D, 0x5F, 0xCD, 0x4A, 0xB4, 0x1A, 0x42, 0x35,
73 0x86, 0x3A, 0x6F, 0xA9, 0xFA, 0x27, 0xAB, 0xDE, 0x03, 0x21,
74 0x36, 0x0A, 0x07, 0x29, 0xC9, 0x2F, 0x6D, 0x49, 0xA8, 0xF7,
75 0xC6, 0xF4, 0x92, 0xD7, 0x73, 0xC1, 0xD8, 0x76, 0x0E, 0x61,
76 0xA7, 0x0B, 0x6E, 0x96, 0xB8, 0xC8, 0xCB, 0x38, 0x35, 0x12,
77 0x20, 0x79, 0xA5, 0x08, 0x28, 0x35, 0x5C, 0xBC, 0x52, 0x16,
78 0xAF, 0x52, 0xBA, 0x0F, 0xC3, 0xB1, 0x63, 0x12, 0x27, 0x0B,
79 0x74, 0xA4, 0x47, 0x43, 0xD6, 0x30, 0xB8, 0x9C, 0x2E, 0x40,
80 0x14, 0xCD, 0x99, 0x7F, 0xE8, 0x8E, 0x37, 0xB0, 0xA9, 0x3F,
81 0x54, 0xE9, 0x66, 0x22, 0x61, 0x4C, 0xF8, 0x49, 0x03, 0x57,
82 0x14, 0x32, 0x1D, 0x37, 0x3D, 0xE2, 0x92, 0xF8, 0x8E, 0xA0,
83 0x6A, 0x66, 0x63, 0xF0, 0xB0, 0x6E, 0x07, 0x2B, 0x3D, 0xBF,
84 0xD0, 0x84, 0x6A, 0xAA, 0x1F, 0x30, 0x77, 0x65, 0xE5, 0xFC,
85 0xF5, 0xEC, 0x55, 0xCE, 0x73, 0xDB, 0xBE, 0xA7, 0x8D, 0x3A,
86 0x9F, 0x7A, 0xED, 0x4F, 0xAF, 0xA2, 0x80, 0x4C, 0x30, 0x9E,
87 0x28, 0x49, 0x65, 0x40, 0xF0, 0x03, 0x45, 0x56, 0x99, 0xA2,
88 0x93, 0x1B, 0x9C, 0x46, 0xDE, 0xBD, 0xA8, 0xAB, 0x5F, 0x90,
89 0x3F, 0xB7, 0x3F, 0xD4, 0x6F, 0x8D, 0x5A, 0x30, 0xE1, 0xD4,
90 0x63, 0x3A, 0x6A, 0x7C, 0x8F, 0x24, 0xFC, 0xD9, 0x14, 0x28,
91 0x09, 0xE4, 0x84, 0x4E, 0x17, 0x43, 0x56, 0xB8, 0xD4, 0x4B,
92 0xA2, 0x29, 0x45, 0xD3, 0x13, 0xF0, 0xC2, 0x76, 0x9B, 0x01,
93 0xA0, 0x80, 0x6E, 0x93, 0x63, 0x5E, 0x87, 0x24, 0x20, 0x2A,
94 0xFF, 0xBB, 0x9F, 0xA8, 0x99, 0x6C, 0xA7, 0x9A, 0x00, 0xB9,
95 0x7D, 0xDA, 0x66, 0xC9, 0xC0, 0x72, 0x72, 0x22, 0x0F, 0x1A,
96 0xCC, 0x23, 0xD9, 0xB7, 0x5F, 0x1B
97 };
98 DSA *dsa = DSA_new();
99 BIGNUM *p, *q, *g;
100
101 if (dsa == NULL)
102 return NULL;
103 if (!DSA_set0_pqg(dsa, p = BN_bin2bn(dsap_2048, sizeof(dsap_2048), NULL),
104 q = BN_bin2bn(dsaq_2048, sizeof(dsaq_2048), NULL),
105 g = BN_bin2bn(dsag_2048, sizeof(dsag_2048), NULL))) {
106 DSA_free(dsa);
107 BN_free(p);
108 BN_free(q);
109 BN_free(g);
110 return NULL;
111 }
112 return dsa;
113 }
114
genkeys(void)115 static int genkeys(void)
116 {
117 if (!TEST_ptr(dsakey = load_dsa_params()))
118 return 0;
119
120 if (!TEST_int_eq(DSA_generate_key(dsakey), 1))
121 return 0;
122
123 return 1;
124 }
125
sign_and_verify(int len)126 static int sign_and_verify(int len)
127 {
128 /*
129 * Per FIPS 186-4, the hash is recommended to be the same length as q.
130 * If the hash is longer than q, the leftmost N bits are used; if the hash
131 * is shorter, then we left-pad (see appendix C.2.1).
132 */
133 size_t sigLength;
134 int digestlen = BN_num_bytes(DSA_get0_q(dsakey));
135 int ok = 0;
136
137 unsigned char *dataToSign = OPENSSL_malloc(len);
138 unsigned char *paddedData = OPENSSL_malloc(digestlen);
139 unsigned char *signature = NULL;
140 EVP_PKEY_CTX *ctx = NULL;
141 EVP_PKEY *pkey = NULL;
142
143 if (!TEST_ptr(dataToSign) || !TEST_ptr(paddedData) || !TEST_int_eq(RAND_bytes(dataToSign, len), 1))
144 goto end;
145
146 memset(paddedData, 0, digestlen);
147 if (len > digestlen)
148 memcpy(paddedData, dataToSign, digestlen);
149 else
150 memcpy(paddedData + digestlen - len, dataToSign, len);
151
152 if (!TEST_ptr(pkey = EVP_PKEY_new()))
153 goto end;
154 EVP_PKEY_set1_DSA(pkey, dsakey);
155
156 if (!TEST_ptr(ctx = EVP_PKEY_CTX_new(pkey, NULL)))
157 goto end;
158 if (!TEST_int_eq(EVP_PKEY_sign_init(ctx), 1))
159 goto end;
160
161 if (EVP_PKEY_sign(ctx, NULL, &sigLength, dataToSign, len) != 1) {
162 TEST_error("Failed to get signature length, len=%d", len);
163 goto end;
164 }
165
166 if (!TEST_ptr(signature = OPENSSL_malloc(sigLength)))
167 goto end;
168
169 if (EVP_PKEY_sign(ctx, signature, &sigLength, dataToSign, len) != 1) {
170 TEST_error("Failed to sign, len=%d", len);
171 goto end;
172 }
173
174 /* Check that the signature is okay via the EVP interface */
175 if (!TEST_int_eq(EVP_PKEY_verify_init(ctx), 1))
176 goto end;
177
178 /* ... using the same data we just signed */
179 if (EVP_PKEY_verify(ctx, signature, sigLength, dataToSign, len) != 1) {
180 TEST_error("EVP verify with unpadded length %d failed\n", len);
181 goto end;
182 }
183
184 /* ... padding/truncating the data to the appropriate digest size */
185 if (EVP_PKEY_verify(ctx, signature, sigLength, paddedData, digestlen) != 1) {
186 TEST_error("EVP verify with length %d failed\n", len);
187 goto end;
188 }
189
190 /* Verify again using the raw DSA interface */
191 if (DSA_verify(0, dataToSign, len, signature, sigLength, dsakey) != 1) {
192 TEST_error("Verification with unpadded data failed, len=%d", len);
193 goto end;
194 }
195
196 if (DSA_verify(0, paddedData, digestlen, signature, sigLength, dsakey) != 1) {
197 TEST_error("verify with length %d failed\n", len);
198 goto end;
199 }
200
201 ok = 1;
202 end:
203 EVP_PKEY_CTX_free(ctx);
204 EVP_PKEY_free(pkey);
205
206 OPENSSL_free(signature);
207 OPENSSL_free(paddedData);
208 OPENSSL_free(dataToSign);
209
210 return ok;
211 }
212
dsa_exact_size_test(void)213 static int dsa_exact_size_test(void)
214 {
215 /*
216 * For a 2048-bit p, q should be either 224 or 256 bits per the table in
217 * FIPS 186-4 4.2.
218 */
219
220 return sign_and_verify(224 / 8) && sign_and_verify(256 / 8);
221 }
222
dsa_small_digest_test(void)223 static int dsa_small_digest_test(void)
224 {
225 return sign_and_verify(16) && sign_and_verify(1);
226 }
227
dsa_large_digest_test(void)228 static int dsa_large_digest_test(void)
229 {
230 return sign_and_verify(33) && sign_and_verify(64);
231 }
232
cleanup_tests(void)233 void cleanup_tests(void)
234 {
235 DSA_free(dsakey);
236 }
237
238 #endif /* OPENSSL_NO_DSA */
239
setup_tests(void)240 int setup_tests(void)
241 {
242 #ifndef OPENSSL_NO_DSA
243 if (!genkeys())
244 return 0;
245
246 ADD_TEST(dsa_exact_size_test);
247 ADD_TEST(dsa_small_digest_test);
248 ADD_TEST(dsa_large_digest_test);
249 #endif
250 return 1;
251 }
252