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annotate libtomcrypt/demos/ltcrypt.c @ 1663:c795520269f9

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Fallback for key gen without hard link support (#89) Add a non-atomic fallback for key generation on platforms where link() is not permitted (such as most stock Android installs) or on filesystems without hard link support (such as FAT).
author Matt Robinson <git@nerdoftheherd.com>
date Sat, 14 Mar 2020 14:37:35 +0000
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1471
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 */
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9
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10 /* encrypt V1.1 Fri Oct 18 04:28:03 NZDT 2002 */
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11 /* File de/encryption, using libtomcrypt */
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12 /* Written by Daniel Richards <[email protected]> */
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13 /* Help from Tom St Denis with various bits */
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14 /* This code is public domain, no rights reserved. */
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15 /* Encrypts by default, -d flag enables decryption */
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16 /* ie: ./encrypt blowfish story.txt story.ct */
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17 /* ./encrypt -d blowfish story.ct story.pt */
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18
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19 #include <tomcrypt.h>
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20
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21 int usage(char *name)
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22 {
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23 int x;
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24
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25 printf("Usage encrypt: %s cipher infile outfile\n", name);
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26 printf("Usage decrypt: %s -d cipher infile outfile\n", name);
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27 printf("Usage test: %s -t cipher\nCiphers:\n", name);
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28 for (x = 0; cipher_descriptor[x].name != NULL; x++) {
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29 printf("%s\n",cipher_descriptor[x].name);
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30 }
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31 exit(1);
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32 }
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33
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34 int main(int argc, char *argv[])
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35 {
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36 unsigned char plaintext[512],ciphertext[512];
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37 unsigned char tmpkey[512], key[MAXBLOCKSIZE], IV[MAXBLOCKSIZE];
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38 unsigned char inbuf[512]; /* i/o block size */
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39 unsigned long outlen, y, ivsize, x, decrypt;
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40 symmetric_CTR ctr;
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41 int cipher_idx, hash_idx, ks;
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42 char *infile, *outfile, *cipher;
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43 prng_state prng;
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44 FILE *fdin, *fdout;
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45 int err;
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46
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47 /* register algs, so they can be printed */
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48 register_all_ciphers();
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49 register_all_hashes();
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50 register_all_prngs();
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51
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52 if (argc < 4) {
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53 if ((argc > 2) && (!strcmp(argv[1], "-t"))) {
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54 cipher = argv[2];
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55 cipher_idx = find_cipher(cipher);
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56 if (cipher_idx == -1) {
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57 printf("Invalid cipher %s entered on command line.\n", cipher);
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58 exit(-1);
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59 } /* if */
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60 if (cipher_descriptor[cipher_idx].test)
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61 {
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62 if (cipher_descriptor[cipher_idx].test() != CRYPT_OK)
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63 {
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64 printf("Error when testing cipher %s.\n", cipher);
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65 exit(-1);
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66 }
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67 else
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68 {
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69 printf("Testing cipher %s succeeded.\n", cipher);
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70 exit(0);
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71 } /* if ... else */
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72 } /* if */
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73 }
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74 return usage(argv[0]);
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75 }
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76
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77 if (!strcmp(argv[1], "-d")) {
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78 decrypt = 1;
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79 cipher = argv[2];
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80 infile = argv[3];
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81 outfile = argv[4];
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82 } else {
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83 decrypt = 0;
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84 cipher = argv[1];
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85 infile = argv[2];
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86 outfile = argv[3];
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87 }
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88
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89 /* file handles setup */
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90 fdin = fopen(infile,"rb");
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91 if (fdin == NULL) {
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92 perror("Can't open input for reading");
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93 exit(-1);
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94 }
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95
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96 fdout = fopen(outfile,"wb");
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97 if (fdout == NULL) {
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98 perror("Can't open output for writing");
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99 exit(-1);
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100 }
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101
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102 cipher_idx = find_cipher(cipher);
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103 if (cipher_idx == -1) {
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104 printf("Invalid cipher entered on command line.\n");
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105 exit(-1);
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106 }
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107
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108 hash_idx = find_hash("sha256");
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109 if (hash_idx == -1) {
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110 printf("LTC_SHA256 not found...?\n");
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111 exit(-1);
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112 }
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113
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114 ivsize = cipher_descriptor[cipher_idx].block_length;
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115 ks = hash_descriptor[hash_idx].hashsize;
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116 if (cipher_descriptor[cipher_idx].keysize(&ks) != CRYPT_OK) {
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117 printf("Invalid keysize???\n");
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118 exit(-1);
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119 }
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120
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121 printf("\nEnter key: ");
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122 if(fgets((char *)tmpkey,sizeof(tmpkey), stdin) == NULL)
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123 exit(-1);
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124 outlen = sizeof(key);
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125 if ((err = hash_memory(hash_idx,tmpkey,strlen((char *)tmpkey),key,&outlen)) != CRYPT_OK) {
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126 printf("Error hashing key: %s\n", error_to_string(err));
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127 exit(-1);
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128 }
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129
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130 if (decrypt) {
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131 /* Need to read in IV */
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132 if (fread(IV,1,ivsize,fdin) != ivsize) {
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133 printf("Error reading IV from input.\n");
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134 exit(-1);
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135 }
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136
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137 if ((err = ctr_start(cipher_idx,IV,key,ks,0,CTR_COUNTER_LITTLE_ENDIAN,&ctr)) != CRYPT_OK) {
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138 printf("ctr_start error: %s\n",error_to_string(err));
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139 exit(-1);
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140 }
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141
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142 /* IV done */
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143 do {
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144 y = fread(inbuf,1,sizeof(inbuf),fdin);
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145
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146 if ((err = ctr_decrypt(inbuf,plaintext,y,&ctr)) != CRYPT_OK) {
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147 printf("ctr_decrypt error: %s\n", error_to_string(err));
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148 exit(-1);
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149 }
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150
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151 if (fwrite(plaintext,1,y,fdout) != y) {
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152 printf("Error writing to file.\n");
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153 exit(-1);
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154 }
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155 } while (y == sizeof(inbuf));
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156 fclose(fdin);
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157 fclose(fdout);
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158
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159 } else { /* encrypt */
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160 /* Setup yarrow for random bytes for IV */
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161
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162 if ((err = rng_make_prng(128, find_prng("yarrow"), &prng, NULL)) != CRYPT_OK) {
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163 printf("Error setting up PRNG, %s\n", error_to_string(err));
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164 }
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165
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166 /* You can use rng_get_bytes on platforms that support it */
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167 /* x = rng_get_bytes(IV,ivsize,NULL);*/
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168 x = yarrow_read(IV,ivsize,&prng);
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169 if (x != ivsize) {
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170 printf("Error reading PRNG for IV required.\n");
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171 exit(-1);
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172 }
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173
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174 if (fwrite(IV,1,ivsize,fdout) != ivsize) {
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175 printf("Error writing IV to output.\n");
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176 exit(-1);
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177 }
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178
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179 if ((err = ctr_start(cipher_idx,IV,key,ks,0,CTR_COUNTER_LITTLE_ENDIAN,&ctr)) != CRYPT_OK) {
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180 printf("ctr_start error: %s\n",error_to_string(err));
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181 exit(-1);
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182 }
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183
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184 do {
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185 y = fread(inbuf,1,sizeof(inbuf),fdin);
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186
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187 if ((err = ctr_encrypt(inbuf,ciphertext,y,&ctr)) != CRYPT_OK) {
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188 printf("ctr_encrypt error: %s\n", error_to_string(err));
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189 exit(-1);
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190 }
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191
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192 if (fwrite(ciphertext,1,y,fdout) != y) {
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193 printf("Error writing to output.\n");
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194 exit(-1);
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195 }
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196 } while (y == sizeof(inbuf));
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197 fclose(fdout);
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198 fclose(fdin);
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199 }
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200 return 0;
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201 }
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202
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203 /* ref: $Format:%D$ */
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diff changeset
204 /* git commit: $Format:%H$ */
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205 /* commit time: $Format:%ai$ */