1 | /*
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2 | * Copyright 2018-2020 The OpenSSL Project Authors. All Rights Reserved.
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3 | *
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4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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5 | * this file except in compliance with the License. You can obtain a copy
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6 | * in the file LICENSE in the source distribution or at
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7 | * https://www.openssl.org/source/license.html
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8 | */
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9 |
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10 | /*
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11 | * DSA low level APIs are deprecated for public use, but still ok for
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12 | * internal use.
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13 | */
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14 | #include "internal/deprecated.h"
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15 |
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16 | #include <stdlib.h>
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17 | #include <string.h>
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18 |
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19 | #include "testutil.h"
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20 |
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21 | #include <openssl/evp.h>
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22 | #include <openssl/err.h>
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23 | #include <openssl/rand.h>
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24 |
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25 | #ifndef OPENSSL_NO_DSA
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26 | #include <openssl/dsa.h>
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27 |
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28 | static DSA *dsakey;
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29 |
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30 | /*
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31 | * These parameters are from test/recipes/04-test_pem_data/dsaparam.pem,
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32 | * converted using dsaparam -C
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33 | */
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34 | static DSA *load_dsa_params(void)
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35 | {
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36 | static unsigned char dsap_2048[] = {
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37 | 0xAE, 0x35, 0x7D, 0x4E, 0x1D, 0x96, 0xE2, 0x9F, 0x00, 0x96,
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38 | 0x60, 0x5A, 0x6E, 0x4D, 0x07, 0x8D, 0xA5, 0x7C, 0xBC, 0xF9,
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39 | 0xAD, 0xD7, 0x9F, 0xD5, 0xE9, 0xEE, 0xA6, 0x33, 0x51, 0xDE,
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40 | 0x7B, 0x72, 0xD2, 0x75, 0xAA, 0x71, 0x77, 0xF1, 0x63, 0xFB,
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41 | 0xB6, 0xEC, 0x5A, 0xBA, 0x0D, 0x72, 0xA2, 0x1A, 0x1C, 0x64,
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42 | 0xB8, 0xE5, 0x89, 0x09, 0x6D, 0xC9, 0x6F, 0x0B, 0x7F, 0xD2,
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43 | 0xCE, 0x9F, 0xEF, 0x87, 0x5A, 0xB6, 0x67, 0x2F, 0xEF, 0xEE,
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44 | 0xEB, 0x59, 0xF5, 0x5E, 0xFF, 0xA8, 0x28, 0x84, 0x9E, 0x5B,
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45 | 0x37, 0x09, 0x11, 0x80, 0x7C, 0x08, 0x5C, 0xD5, 0xE1, 0x48,
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46 | 0x4B, 0xD2, 0x68, 0xFB, 0x3F, 0x9F, 0x2B, 0x6B, 0x6C, 0x0D,
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47 | 0x48, 0x1B, 0x1A, 0x80, 0xC2, 0xEB, 0x11, 0x1B, 0x37, 0x79,
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48 | 0xD6, 0x8C, 0x8B, 0x72, 0x3E, 0x67, 0xA5, 0x05, 0x0E, 0x41,
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49 | 0x8A, 0x9E, 0x35, 0x50, 0xB4, 0xD2, 0x40, 0x27, 0x6B, 0xFD,
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50 | 0xE0, 0x64, 0x6B, 0x5B, 0x38, 0x42, 0x94, 0xB5, 0x49, 0xDA,
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51 | 0xEF, 0x6E, 0x78, 0x37, 0xCD, 0x30, 0x89, 0xC3, 0x45, 0x50,
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52 | 0x7B, 0x9C, 0x8C, 0xE7, 0x1C, 0x98, 0x70, 0x71, 0x5D, 0x79,
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53 | 0x5F, 0xEF, 0xE8, 0x94, 0x85, 0x53, 0x3E, 0xEF, 0xA3, 0x2C,
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54 | 0xCE, 0x1A, 0xAB, 0x7D, 0xD6, 0x5E, 0x14, 0xCD, 0x51, 0x54,
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55 | 0x89, 0x9D, 0x77, 0xE4, 0xF8, 0x22, 0xF0, 0x35, 0x10, 0x75,
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56 | 0x05, 0x71, 0x51, 0x4F, 0x8C, 0x4C, 0x5C, 0x0D, 0x2C, 0x2C,
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57 | 0xBE, 0x6C, 0x34, 0xEE, 0x12, 0x82, 0x87, 0x03, 0x19, 0x06,
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58 | 0x12, 0xA8, 0xAA, 0xF4, 0x0D, 0x3C, 0x49, 0xCC, 0x70, 0x5A,
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59 | 0xD8, 0x32, 0xEE, 0x32, 0x50, 0x85, 0x70, 0xE8, 0x18, 0xFD,
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60 | 0x74, 0x80, 0x53, 0x32, 0x57, 0xEE, 0x50, 0xC9, 0xAE, 0xEB,
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61 | 0xAE, 0xB6, 0x22, 0x32, 0x16, 0x6B, 0x8C, 0x59, 0xDA, 0xEE,
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62 | 0x1D, 0x33, 0xDF, 0x4C, 0xA2, 0x3D
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63 | };
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64 | static unsigned char dsaq_2048[] = {
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65 | 0xAD, 0x2D, 0x6E, 0x17, 0xB0, 0xF3, 0xEB, 0xC7, 0xB8, 0xEE,
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66 | 0x95, 0x78, 0xF2, 0x17, 0xF5, 0x33, 0x01, 0x67, 0xBC, 0xDE,
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67 | 0x93, 0xFF, 0xEE, 0x40, 0xE8, 0x7F, 0xF1, 0x93, 0x6D, 0x4B,
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68 | 0x87, 0x13
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69 | };
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70 | static unsigned char dsag_2048[] = {
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71 | 0x66, 0x6F, 0xDA, 0x63, 0xA5, 0x8E, 0xD2, 0x4C, 0xD5, 0x45,
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72 | 0x2D, 0x76, 0x5D, 0x5F, 0xCD, 0x4A, 0xB4, 0x1A, 0x42, 0x35,
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73 | 0x86, 0x3A, 0x6F, 0xA9, 0xFA, 0x27, 0xAB, 0xDE, 0x03, 0x21,
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74 | 0x36, 0x0A, 0x07, 0x29, 0xC9, 0x2F, 0x6D, 0x49, 0xA8, 0xF7,
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75 | 0xC6, 0xF4, 0x92, 0xD7, 0x73, 0xC1, 0xD8, 0x76, 0x0E, 0x61,
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76 | 0xA7, 0x0B, 0x6E, 0x96, 0xB8, 0xC8, 0xCB, 0x38, 0x35, 0x12,
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77 | 0x20, 0x79, 0xA5, 0x08, 0x28, 0x35, 0x5C, 0xBC, 0x52, 0x16,
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78 | 0xAF, 0x52, 0xBA, 0x0F, 0xC3, 0xB1, 0x63, 0x12, 0x27, 0x0B,
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79 | 0x74, 0xA4, 0x47, 0x43, 0xD6, 0x30, 0xB8, 0x9C, 0x2E, 0x40,
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80 | 0x14, 0xCD, 0x99, 0x7F, 0xE8, 0x8E, 0x37, 0xB0, 0xA9, 0x3F,
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81 | 0x54, 0xE9, 0x66, 0x22, 0x61, 0x4C, 0xF8, 0x49, 0x03, 0x57,
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82 | 0x14, 0x32, 0x1D, 0x37, 0x3D, 0xE2, 0x92, 0xF8, 0x8E, 0xA0,
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83 | 0x6A, 0x66, 0x63, 0xF0, 0xB0, 0x6E, 0x07, 0x2B, 0x3D, 0xBF,
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84 | 0xD0, 0x84, 0x6A, 0xAA, 0x1F, 0x30, 0x77, 0x65, 0xE5, 0xFC,
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85 | 0xF5, 0xEC, 0x55, 0xCE, 0x73, 0xDB, 0xBE, 0xA7, 0x8D, 0x3A,
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86 | 0x9F, 0x7A, 0xED, 0x4F, 0xAF, 0xA2, 0x80, 0x4C, 0x30, 0x9E,
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87 | 0x28, 0x49, 0x65, 0x40, 0xF0, 0x03, 0x45, 0x56, 0x99, 0xA2,
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88 | 0x93, 0x1B, 0x9C, 0x46, 0xDE, 0xBD, 0xA8, 0xAB, 0x5F, 0x90,
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89 | 0x3F, 0xB7, 0x3F, 0xD4, 0x6F, 0x8D, 0x5A, 0x30, 0xE1, 0xD4,
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90 | 0x63, 0x3A, 0x6A, 0x7C, 0x8F, 0x24, 0xFC, 0xD9, 0x14, 0x28,
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91 | 0x09, 0xE4, 0x84, 0x4E, 0x17, 0x43, 0x56, 0xB8, 0xD4, 0x4B,
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92 | 0xA2, 0x29, 0x45, 0xD3, 0x13, 0xF0, 0xC2, 0x76, 0x9B, 0x01,
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93 | 0xA0, 0x80, 0x6E, 0x93, 0x63, 0x5E, 0x87, 0x24, 0x20, 0x2A,
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94 | 0xFF, 0xBB, 0x9F, 0xA8, 0x99, 0x6C, 0xA7, 0x9A, 0x00, 0xB9,
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95 | 0x7D, 0xDA, 0x66, 0xC9, 0xC0, 0x72, 0x72, 0x22, 0x0F, 0x1A,
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96 | 0xCC, 0x23, 0xD9, 0xB7, 0x5F, 0x1B
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97 | };
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98 | DSA *dsa = DSA_new();
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99 | BIGNUM *p, *q, *g;
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100 |
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101 | if (dsa == NULL)
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102 | return NULL;
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103 | if (!DSA_set0_pqg(dsa, p = BN_bin2bn(dsap_2048, sizeof(dsap_2048), NULL),
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104 | q = BN_bin2bn(dsaq_2048, sizeof(dsaq_2048), NULL),
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105 | g = BN_bin2bn(dsag_2048, sizeof(dsag_2048), NULL))) {
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106 | DSA_free(dsa);
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107 | BN_free(p);
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108 | BN_free(q);
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109 | BN_free(g);
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110 | return NULL;
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111 | }
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112 | return dsa;
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113 | }
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114 |
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115 | static int genkeys(void)
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116 | {
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117 | if (!TEST_ptr(dsakey = load_dsa_params()))
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118 | return 0;
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119 |
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120 | if (!TEST_int_eq(DSA_generate_key(dsakey), 1))
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121 | return 0;
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122 |
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123 | return 1;
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124 | }
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125 |
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126 | static int sign_and_verify(int len)
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127 | {
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128 | /*
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129 | * Per FIPS 186-4, the hash is recommended to be the same length as q.
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130 | * If the hash is longer than q, the leftmost N bits are used; if the hash
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131 | * is shorter, then we left-pad (see appendix C.2.1).
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132 | */
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133 | size_t sigLength;
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134 | int digestlen = BN_num_bytes(DSA_get0_q(dsakey));
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135 | int ok = 0;
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136 |
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137 | unsigned char *dataToSign = OPENSSL_malloc(len);
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138 | unsigned char *paddedData = OPENSSL_malloc(digestlen);
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139 | unsigned char *signature = NULL;
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140 | EVP_PKEY_CTX *ctx = NULL;
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141 | EVP_PKEY *pkey = NULL;
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142 |
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143 | if (!TEST_ptr(dataToSign) ||
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144 | !TEST_ptr(paddedData) ||
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145 | !TEST_int_eq(RAND_bytes(dataToSign, len), 1))
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146 | goto end;
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147 |
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148 | memset(paddedData, 0, digestlen);
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149 | if (len > digestlen)
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150 | memcpy(paddedData, dataToSign, digestlen);
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151 | else
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152 | memcpy(paddedData + digestlen - len, dataToSign, len);
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153 |
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154 | if (!TEST_ptr(pkey = EVP_PKEY_new()))
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155 | goto end;
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156 | EVP_PKEY_set1_DSA(pkey, dsakey);
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157 |
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158 | if (!TEST_ptr(ctx = EVP_PKEY_CTX_new(pkey, NULL)))
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159 | goto end;
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160 | if (!TEST_int_eq(EVP_PKEY_sign_init(ctx), 1))
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161 | goto end;
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162 |
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163 | if (EVP_PKEY_sign(ctx, NULL, &sigLength, dataToSign, len) != 1) {
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164 | TEST_error("Failed to get signature length, len=%d", len);
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165 | goto end;
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166 | }
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167 |
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168 | if (!TEST_ptr(signature = OPENSSL_malloc(sigLength)))
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169 | goto end;
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170 |
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171 | if (EVP_PKEY_sign(ctx, signature, &sigLength, dataToSign, len) != 1) {
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172 | TEST_error("Failed to sign, len=%d", len);
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173 | goto end;
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174 | }
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175 |
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176 | /* Check that the signature is okay via the EVP interface */
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177 | if (!TEST_int_eq(EVP_PKEY_verify_init(ctx), 1))
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178 | goto end;
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179 |
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180 | /* ... using the same data we just signed */
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181 | if (EVP_PKEY_verify(ctx, signature, sigLength, dataToSign, len) != 1) {
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182 | TEST_error("EVP verify with unpadded length %d failed\n", len);
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183 | goto end;
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184 | }
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185 |
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186 | /* ... padding/truncating the data to the appropriate digest size */
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187 | if (EVP_PKEY_verify(ctx, signature, sigLength, paddedData, digestlen) != 1) {
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188 | TEST_error("EVP verify with length %d failed\n", len);
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189 | goto end;
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190 | }
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191 |
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192 | /* Verify again using the raw DSA interface */
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193 | if (DSA_verify(0, dataToSign, len, signature, sigLength, dsakey) != 1) {
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194 | TEST_error("Verification with unpadded data failed, len=%d", len);
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195 | goto end;
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196 | }
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197 |
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198 | if (DSA_verify(0, paddedData, digestlen, signature, sigLength, dsakey) != 1) {
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199 | TEST_error("verify with length %d failed\n", len);
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200 | goto end;
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201 | }
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202 |
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203 | ok = 1;
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204 | end:
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205 | EVP_PKEY_CTX_free(ctx);
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206 | EVP_PKEY_free(pkey);
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207 |
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208 | OPENSSL_free(signature);
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209 | OPENSSL_free(paddedData);
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210 | OPENSSL_free(dataToSign);
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211 |
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212 | return ok;
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213 | }
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214 |
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215 | static int dsa_exact_size_test(void) {
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216 | /*
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217 | * For a 2048-bit p, q should be either 224 or 256 bits per the table in
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218 | * FIPS 186-4 4.2.
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219 | */
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220 |
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221 | return sign_and_verify(224 / 8) && sign_and_verify(256 / 8);
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222 | }
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223 |
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224 | static int dsa_small_digest_test(void) {
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225 | return sign_and_verify(16) && sign_and_verify(1);
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226 | }
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227 |
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228 | static int dsa_large_digest_test(void) {
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229 | return sign_and_verify(33) && sign_and_verify(64);
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230 | }
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231 |
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232 | void cleanup_tests(void)
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233 | {
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234 | DSA_free(dsakey);
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235 | }
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236 |
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237 | #endif /* OPENSSL_NO_DSA */
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238 |
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239 | int setup_tests(void)
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240 | {
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241 | #ifndef OPENSSL_NO_DSA
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242 | if (!genkeys())
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243 | return 0;
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244 |
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245 | ADD_TEST(dsa_exact_size_test);
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246 | ADD_TEST(dsa_small_digest_test);
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247 | ADD_TEST(dsa_large_digest_test);
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248 | #endif
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249 | return 1;
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250 | }
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251 |
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