1 | /*
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2 | * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
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3 | *
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4 | * Licensed under the OpenSSL license (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 | #include <stdio.h>
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11 | #include "internal/cryptlib.h"
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12 | #include <openssl/evp.h>
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13 | #include <openssl/objects.h>
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14 | #include <openssl/x509.h>
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15 | #include "internal/evp_int.h"
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16 | #include "evp_locl.h"
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17 |
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18 | static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
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19 | const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey,
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20 | int ver)
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21 | {
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22 | if (ctx->pctx == NULL)
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23 | ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
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24 | if (ctx->pctx == NULL)
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25 | return 0;
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26 |
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27 | if (!(ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)) {
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28 |
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29 | if (type == NULL) {
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30 | int def_nid;
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31 | if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0)
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32 | type = EVP_get_digestbynid(def_nid);
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33 | }
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34 |
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35 | if (type == NULL) {
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36 | EVPerr(EVP_F_DO_SIGVER_INIT, EVP_R_NO_DEFAULT_DIGEST);
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37 | return 0;
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38 | }
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39 | }
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40 |
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41 | if (ver) {
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42 | if (ctx->pctx->pmeth->verifyctx_init) {
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43 | if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <= 0)
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44 | return 0;
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45 | ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX;
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46 | } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0)
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47 | return 0;
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48 | } else {
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49 | if (ctx->pctx->pmeth->signctx_init) {
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50 | if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0)
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51 | return 0;
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52 | ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX;
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53 | } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0)
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54 | return 0;
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55 | }
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56 | if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0)
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57 | return 0;
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58 | if (pctx)
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59 | *pctx = ctx->pctx;
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60 | if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)
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61 | return 1;
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62 | if (!EVP_DigestInit_ex(ctx, type, e))
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63 | return 0;
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64 | return 1;
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65 | }
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66 |
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67 | int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
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68 | const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
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69 | {
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70 | return do_sigver_init(ctx, pctx, type, e, pkey, 0);
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71 | }
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72 |
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73 | int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
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74 | const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
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75 | {
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76 | return do_sigver_init(ctx, pctx, type, e, pkey, 1);
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77 | }
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78 |
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79 | int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
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80 | size_t *siglen)
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81 | {
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82 | int sctx = 0, r = 0;
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83 | EVP_PKEY_CTX *pctx = ctx->pctx;
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84 | if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) {
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85 | if (!sigret)
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86 | return pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
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87 | if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE)
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88 | r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
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89 | else {
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90 | EVP_PKEY_CTX *dctx = EVP_PKEY_CTX_dup(ctx->pctx);
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91 | if (!dctx)
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92 | return 0;
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93 | r = dctx->pmeth->signctx(dctx, sigret, siglen, ctx);
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94 | EVP_PKEY_CTX_free(dctx);
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95 | }
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96 | return r;
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97 | }
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98 | if (pctx->pmeth->signctx)
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99 | sctx = 1;
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100 | else
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101 | sctx = 0;
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102 | if (sigret) {
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103 | unsigned char md[EVP_MAX_MD_SIZE];
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104 | unsigned int mdlen = 0;
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105 | if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
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106 | if (sctx)
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107 | r = ctx->pctx->pmeth->signctx(ctx->pctx, sigret, siglen, ctx);
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108 | else
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109 | r = EVP_DigestFinal_ex(ctx, md, &mdlen);
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110 | } else {
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111 | EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
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112 | if (tmp_ctx == NULL || !EVP_MD_CTX_copy_ex(tmp_ctx, ctx))
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113 | return 0;
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114 | if (sctx)
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115 | r = tmp_ctx->pctx->pmeth->signctx(tmp_ctx->pctx,
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116 | sigret, siglen, tmp_ctx);
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117 | else
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118 | r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
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119 | EVP_MD_CTX_free(tmp_ctx);
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120 | }
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121 | if (sctx || !r)
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122 | return r;
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123 | if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, md, mdlen) <= 0)
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124 | return 0;
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125 | } else {
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126 | if (sctx) {
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127 | if (pctx->pmeth->signctx(pctx, sigret, siglen, ctx) <= 0)
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128 | return 0;
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129 | } else {
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130 | int s = EVP_MD_size(ctx->digest);
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131 | if (s < 0 || EVP_PKEY_sign(pctx, sigret, siglen, NULL, s) <= 0)
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132 | return 0;
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133 | }
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134 | }
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135 | return 1;
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136 | }
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137 |
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138 | int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig,
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139 | size_t siglen)
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140 | {
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141 | unsigned char md[EVP_MAX_MD_SIZE];
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142 | int r = 0;
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143 | unsigned int mdlen = 0;
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144 | int vctx = 0;
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145 |
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146 | if (ctx->pctx->pmeth->verifyctx)
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147 | vctx = 1;
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148 | else
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149 | vctx = 0;
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150 | if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
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151 | if (vctx) {
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152 | r = ctx->pctx->pmeth->verifyctx(ctx->pctx, sig, siglen, ctx);
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153 | } else
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154 | r = EVP_DigestFinal_ex(ctx, md, &mdlen);
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155 | } else {
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156 | EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
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157 | if (tmp_ctx == NULL || !EVP_MD_CTX_copy_ex(tmp_ctx, ctx))
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158 | return -1;
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159 | if (vctx) {
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160 | r = tmp_ctx->pctx->pmeth->verifyctx(tmp_ctx->pctx,
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161 | sig, siglen, tmp_ctx);
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162 | } else
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163 | r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
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164 | EVP_MD_CTX_free(tmp_ctx);
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165 | }
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166 | if (vctx || !r)
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167 | return r;
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168 | return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen);
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169 | }
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