libidav/crypto.c

Thu, 15 Oct 2015 15:01:50 +0200

author
Mike Becker <universe@uap-core.de>
date
Thu, 15 Oct 2015 15:01:50 +0200
changeset 169
08adb4f87160
parent 155
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child 183
c238e0017257
permissions
-rw-r--r--

more updates to ucx

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
75
56962faf2b42 copyright update
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4 * Copyright 2015 Olaf Wintermann. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include <stdio.h>
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30 #include <stdlib.h>
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31 #include <string.h>
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32 #include <openssl/rand.h>
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33
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34 #include <libidav/utils.h>
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35 #include "crypto.h"
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36
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37 AESDecrypter* aes_decrypter_new(DavKey *key, void *stream, dav_write_func write_func) {
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38 AESDecrypter *dec = malloc(sizeof(AESDecrypter));
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39 SHA256_Init(&dec->sha256);
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40 dec->stream = stream;
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41 dec->write = write_func;
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42 dec->key = key;
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43 dec->init = 0;
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44 dec->ivpos = 0;
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45
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46 return dec;
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47 }
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48
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49 void aes_decrypter_init(AESDecrypter *dec) {
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50 EVP_CIPHER_CTX_init(&dec->ctx);
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51 dec->init = 1;
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52 if(dec->key->type == DAV_KEY_AES128) {
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53 EVP_DecryptInit_ex(
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54 &dec->ctx,
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55 EVP_aes_128_cbc(),
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56 NULL,
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57 dec->key->data,
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58 dec->ivtmp);
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59 } else if(dec->key->type == DAV_KEY_AES256) {
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60 EVP_DecryptInit_ex(
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61 &dec->ctx,
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62 EVP_aes_256_cbc(),
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63 NULL,
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64 dec->key->data,
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65 dec->ivtmp);
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66 } else {
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67 fprintf(stderr, "unknown key type\n");
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68 exit(-1);
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69 }
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70 }
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71
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72 size_t aes_write(const void *buf, size_t s, size_t n, AESDecrypter *dec) {
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73 int len = s*n;
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74 if(!dec->init) {
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75 size_t n = 16 - dec->ivpos;
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76 size_t cp = n > len ? len : n;
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77 memcpy(dec->ivtmp + dec->ivpos, buf, cp);
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78 dec->ivpos += cp;
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79 if(dec->ivpos >= 16) {
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80 aes_decrypter_init(dec);
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81 }
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82 if(len == cp) {
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83 return len;
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84 } else {
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85 buf = (char*)buf + cp;
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86 len -= cp;
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87 }
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88 }
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89
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90 int outlen = len + 16;
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91 unsigned char *out = malloc(outlen);
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92 EVP_DecryptUpdate(&dec->ctx, out, &len, buf, len);
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93 ssize_t wlen = dec->write(out, 1, len, dec->stream);
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94 SHA256_Update(&dec->sha256, out, wlen);
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95 free(out);
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96 return (s*n) / s;
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97 }
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98
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99 void aes_decrypter_close(AESDecrypter *dec) {
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100 void *out = malloc(128);
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101 int len = 0;
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102 EVP_DecryptFinal_ex(&dec->ctx, out, &len);
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103 dec->write(out, 1, len, dec->stream);
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104 free(out);
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105 EVP_CIPHER_CTX_cleanup(&dec->ctx);
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106 free(dec);
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107 }
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108
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109
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110 AESEncrypter* aes_encrypter_new(DavKey *key, void *stream, dav_read_func read_func) {
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111 unsigned char *iv = malloc(16);
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112 if(!RAND_bytes(iv, 16)) {
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113 free(iv);
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114 return NULL;
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115 }
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116
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117 AESEncrypter *enc = malloc(sizeof(AESEncrypter));
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118 SHA256_Init(&enc->sha256);
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119 enc->stream = stream;
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120 enc->read = read_func;
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121 enc->tmp = NULL;
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122 enc->tmplen = 0;
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123 enc->tmpoff = 0;
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124 enc->end = 0;
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125 enc->iv = iv;
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126 enc->ivlen = 16;
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127
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128 EVP_CIPHER_CTX_init(&enc->ctx);
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129 if(key->type == DAV_KEY_AES128) {
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130 EVP_EncryptInit_ex(&enc->ctx, EVP_aes_128_cbc(), NULL, key->data, enc->iv);
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131 } else if(key->type == DAV_KEY_AES256) {
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132 EVP_EncryptInit_ex(&enc->ctx, EVP_aes_256_cbc(), NULL, key->data, enc->iv);
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133 } else {
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134 fprintf(stderr, "unknown key type\n");
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135 exit(-1);
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136 }
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137 return enc;
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138 }
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139
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140 size_t aes_read(void *buf, size_t s, size_t n, AESEncrypter *enc) {
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141 size_t len = s*n;
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142 if(enc->tmp) {
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143 size_t tmp_diff = enc->tmplen - enc->tmpoff;
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144 size_t cp_len = tmp_diff > len ? len : tmp_diff;
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145 memcpy(buf, enc->tmp + enc->tmpoff, cp_len);
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146 enc->tmpoff += cp_len;
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147 if(enc->tmpoff >= enc->tmplen) {
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148 free(enc->tmp);
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149 enc->tmp = NULL;
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150 enc->tmplen = 0;
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151 enc->tmpoff = 0;
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152 }
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153 return cp_len / s;
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154 }
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155
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diff changeset
156 if(enc->end) {
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diff changeset
157 return 0;
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158 }
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159
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160 void *in = malloc(len);
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161 size_t in_len = enc->read(in, 1, len, enc->stream);
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162
150
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diff changeset
163 SHA256_Update(&enc->sha256, in, in_len);
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diff changeset
164
40
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165 unsigned char *out = NULL;
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166 int outlen = 0;
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167 size_t ivl = enc->ivlen;
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168 if(in_len != 0) {
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169 outlen = len + 16;
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170 out = malloc(outlen + ivl);
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171 if(enc->iv) {
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172 memcpy(out, enc->iv, ivl);
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173 }
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174 EVP_EncryptUpdate(&enc->ctx, out + ivl, &outlen, in, in_len);
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175 free(in);
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176 } else {
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177 out = malloc(16);
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178 EVP_EncryptFinal_ex(&enc->ctx, out, &outlen);
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179 enc->end = 1;
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diff changeset
180 free(in);
40
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181 }
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diff changeset
182 enc->tmp = (char*)out;
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183 enc->tmplen = outlen + ivl;
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184 enc->tmpoff = 0;
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185
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186 if(enc->iv) {
150
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diff changeset
187 free(enc->iv);
40
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188 enc->iv = NULL;
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189 enc->ivlen = 0;
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190 }
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191
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192 return aes_read(buf, s, n, enc);
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193 }
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194
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195 void aes_encrypter_close(AESEncrypter *enc) {
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diff changeset
196 if(enc->tmp) {
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197 free(enc->tmp);
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198 }
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diff changeset
199 if(enc->iv) {
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200 free(enc->iv);
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diff changeset
201 }
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202 EVP_CIPHER_CTX_cleanup(&enc->ctx);
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203 free(enc);
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204 }
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205
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206
150
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diff changeset
207 char* aes_encrypt(char *in, size_t len, DavKey *key) {
43
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diff changeset
208 unsigned char iv[16];
40
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diff changeset
209 if(!RAND_bytes(iv, 16)) {
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210 return NULL;
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211 }
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212
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213 EVP_CIPHER_CTX ctx;
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214 EVP_CIPHER_CTX_init(&ctx);
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diff changeset
215 if(key->type == DAV_KEY_AES128) {
43
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diff changeset
216 EVP_EncryptInit_ex(
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diff changeset
217 &ctx,
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diff changeset
218 EVP_aes_128_cbc(),
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diff changeset
219 NULL,
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diff changeset
220 (unsigned char*)key->data,
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diff changeset
221 iv);
40
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diff changeset
222 } else if(key->type == DAV_KEY_AES256) {
43
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diff changeset
223 EVP_EncryptInit_ex(
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parents: 40
diff changeset
224 &ctx,
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diff changeset
225 EVP_aes_256_cbc(),
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parents: 40
diff changeset
226 NULL,
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diff changeset
227 (unsigned char*)key->data,
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diff changeset
228 iv);
40
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diff changeset
229 } else {
150
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diff changeset
230 EVP_CIPHER_CTX_cleanup(&ctx);
40
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diff changeset
231 return NULL;
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parents:
diff changeset
232 }
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parents:
diff changeset
233
150
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diff changeset
234 //int len = strlen(in);
40
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diff changeset
235 int buflen = len + 64;
43
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diff changeset
236 unsigned char *buf = calloc(1, buflen);
40
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parents:
diff changeset
237 memcpy(buf, iv, 16);
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parents:
diff changeset
238
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parents:
diff changeset
239 int l = buflen - 16;
43
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diff changeset
240 EVP_EncryptUpdate(&ctx, buf + 16, &l, (unsigned char*)in, len);
40
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parents:
diff changeset
241
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parents:
diff changeset
242 int f = 0;
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parents:
diff changeset
243 EVP_EncryptFinal_ex(&ctx, buf + 16 + l, &f);
43
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parents: 40
diff changeset
244 char *out = util_base64encode((char*)buf, 16 + l + f);
40
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parents:
diff changeset
245 free(buf);
150
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diff changeset
246 EVP_CIPHER_CTX_cleanup(&ctx);
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diff changeset
247
40
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parents:
diff changeset
248 return out;
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parents:
diff changeset
249 }
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parents:
diff changeset
250
150
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diff changeset
251 char* aes_decrypt(char *in, size_t *length, DavKey *key) {
40
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parents:
diff changeset
252 int len;
43
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diff changeset
253 unsigned char *buf = (unsigned char*)util_base64decode_len(in, &len);
40
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parents:
diff changeset
254
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parents:
diff changeset
255 EVP_CIPHER_CTX ctx;
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parents:
diff changeset
256 EVP_CIPHER_CTX_init(&ctx);
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parents:
diff changeset
257 if(key->type == DAV_KEY_AES128) {
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parents:
diff changeset
258 EVP_DecryptInit_ex(
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parents:
diff changeset
259 &ctx,
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parents:
diff changeset
260 EVP_aes_128_cbc(),
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parents:
diff changeset
261 NULL,
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parents:
diff changeset
262 key->data,
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parents:
diff changeset
263 buf);
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parents:
diff changeset
264 } else if(key->type == DAV_KEY_AES256) {
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parents:
diff changeset
265 EVP_DecryptInit_ex(
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parents:
diff changeset
266 &ctx,
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parents:
diff changeset
267 EVP_aes_256_cbc(),
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parents:
diff changeset
268 NULL,
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parents:
diff changeset
269 key->data,
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parents:
diff changeset
270 buf);
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parents:
diff changeset
271 } else {
150
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diff changeset
272 EVP_CIPHER_CTX_cleanup(&ctx);
40
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diff changeset
273 return NULL;
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parents:
diff changeset
274 }
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parents:
diff changeset
275
43
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diff changeset
276 unsigned char *out = malloc(len + 1);
40
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parents:
diff changeset
277 int outlen = len;
43
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diff changeset
278 unsigned char *in_buf = buf + 16;
40
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parents:
diff changeset
279 int inlen = len - 16;
43
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diff changeset
280 int f = 0;
40
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parents:
diff changeset
281
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parents:
diff changeset
282 EVP_DecryptUpdate(&ctx, out, &outlen, in_buf, inlen);
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parents:
diff changeset
283 EVP_DecryptFinal_ex(&ctx, out + outlen, &f);
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parents:
diff changeset
284 out[outlen + f] = '\0';
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parents:
diff changeset
285 free(buf);
150
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diff changeset
286 EVP_CIPHER_CTX_cleanup(&ctx);
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diff changeset
287
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diff changeset
288 *length = outlen + f;
43
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diff changeset
289 return (char*)out;
40
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parents:
diff changeset
290 }
150
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diff changeset
291
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diff changeset
292
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diff changeset
293 void dav_get_hash(SHA256_CTX *sha256, char *buf) {
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parents: 75
diff changeset
294 #ifdef __sun
155
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parents: 150
diff changeset
295 SHA256Final((unsigned char*)buf, sha256);
150
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diff changeset
296 #else
155
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parents: 150
diff changeset
297 SHA256_Final((unsigned char*)buf, sha256);
150
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diff changeset
298 #endif
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diff changeset
299 }

mercurial