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annotate demos/encrypt.c @ 0:d7da3b1e1540 libtomcrypt

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put back the 0.95 makefile which was inadvertently merged over
author Matt Johnston <matt@ucc.asn.au>
date Mon, 31 May 2004 18:21:40 +0000
parents
children 1c15b283127b
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0
d7da3b1e1540 put back the 0.95 makefile which was inadvertently merged over
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1 /* encrypt V1.1 Fri Oct 18 04:28:03 NZDT 2002 */
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2 /* File de/encryption, using libtomcrypt */
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3 /* Written by Daniel Richards <[email protected]> */
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4 /* Help from Tom St Denis with various bits */
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5 /* This code is public domain, no rights reserved. */
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6 /* Encrypts by default, -d flag enables decryption */
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7 /* ie: ./encrypt blowfish story.txt story.ct */
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8 /* ./encrypt -d blowfish story.ct story.pt */
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9
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10 #include <mycrypt.h>
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11
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12 int errno;
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13
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14 int usage(char *name)
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15 {
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16 int x;
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17
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18 printf("Usage: %s [-d](ecrypt) cipher infile outfile\nCiphers:\n", name);
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19 for (x = 0; cipher_descriptor[x].name != NULL; x++) {
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20 printf("%s\n",cipher_descriptor[x].name);
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21 }
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22 exit(1);
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23 }
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24
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25 void register_algs(void)
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26 {
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27 int x;
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28
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29 #ifdef RIJNDAEL
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30 register_cipher (&aes_desc);
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31 #endif
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32 #ifdef BLOWFISH
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33 register_cipher (&blowfish_desc);
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34 #endif
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35 #ifdef XTEA
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36 register_cipher (&xtea_desc);
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37 #endif
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38 #ifdef RC5
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39 register_cipher (&rc5_desc);
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40 #endif
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41 #ifdef RC6
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42 register_cipher (&rc6_desc);
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43 #endif
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44 #ifdef SAFERP
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45 register_cipher (&saferp_desc);
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46 #endif
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47 #ifdef TWOFISH
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48 register_cipher (&twofish_desc);
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49 #endif
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50 #ifdef SAFER
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51 register_cipher (&safer_k64_desc);
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52 register_cipher (&safer_sk64_desc);
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53 register_cipher (&safer_k128_desc);
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54 register_cipher (&safer_sk128_desc);
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55 #endif
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56 #ifdef RC2
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57 register_cipher (&rc2_desc);
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58 #endif
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59 #ifdef DES
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60 register_cipher (&des_desc);
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61 register_cipher (&des3_desc);
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62 #endif
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63 #ifdef CAST5
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64 register_cipher (&cast5_desc);
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65 #endif
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66 #ifdef NOEKEON
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67 register_cipher (&noekeon_desc);
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68 #endif
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69 #ifdef SKIPJACK
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70 register_cipher (&skipjack_desc);
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71 #endif
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72
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73 if (register_hash(&sha256_desc) == -1) {
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74 printf("Error registering SHA256\n");
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75 exit(-1);
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76 }
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77
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78 if (register_prng(&yarrow_desc) == -1) {
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79 printf("Error registering yarrow PRNG\n");
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80 exit(-1);
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81 }
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82
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83 if (register_prng(&sprng_desc) == -1) {
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84 printf("Error registering sprng PRNG\n");
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85 exit(-1);
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86 }
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87 }
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88
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89 int main(int argc, char *argv[])
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90 {
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91 unsigned char plaintext[512],ciphertext[512];
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92 unsigned char tmpkey[512], key[MAXBLOCKSIZE], IV[MAXBLOCKSIZE];
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93 unsigned char inbuf[512]; /* i/o block size */
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94 unsigned long outlen, y, ivsize, x, decrypt;
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95 symmetric_CTR ctr;
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96 int cipher_idx, hash_idx, ks;
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97 char *infile, *outfile, *cipher;
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98 prng_state prng;
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99 FILE *fdin, *fdout;
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100
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101 /* register algs, so they can be printed */
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102 register_algs();
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103
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104 if (argc < 4) {
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105 return usage(argv[0]);
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106 }
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107
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108 if (!strcmp(argv[1], "-d")) {
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109 decrypt = 1;
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110 cipher = argv[2];
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111 infile = argv[3];
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112 outfile = argv[4];
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113 } else {
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114 decrypt = 0;
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115 cipher = argv[1];
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116 infile = argv[2];
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117 outfile = argv[3];
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118 }
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119
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120 /* file handles setup */
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121 fdin = fopen(infile,"rb");
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122 if (fdin == NULL) {
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123 perror("Can't open input for reading");
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124 exit(-1);
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125 }
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126
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127 fdout = fopen(outfile,"wb");
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128 if (fdout == NULL) {
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129 perror("Can't open output for writing");
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130 exit(-1);
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131 }
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132
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133 cipher_idx = find_cipher(cipher);
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134 if (cipher_idx == -1) {
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135 printf("Invalid cipher entered on command line.\n");
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136 exit(-1);
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137 }
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138
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139 hash_idx = find_hash("sha256");
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140 if (hash_idx == -1) {
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141 printf("SHA256 not found...?\n");
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142 exit(-1);
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143 }
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144
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145 ivsize = cipher_descriptor[cipher_idx].block_length;
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146 ks = hash_descriptor[hash_idx].hashsize;
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147 if (cipher_descriptor[cipher_idx].keysize(&ks) != CRYPT_OK) {
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148 printf("Invalid keysize???\n");
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149 exit(-1);
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150 }
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151
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152 printf("\nEnter key: ");
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153 fgets((char *)tmpkey,sizeof(tmpkey), stdin);
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154 outlen = sizeof(key);
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155 if ((errno = hash_memory(hash_idx,tmpkey,strlen((char *)tmpkey),key,&outlen)) != CRYPT_OK) {
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156 printf("Error hashing key: %s\n", error_to_string(errno));
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157 exit(-1);
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158 }
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159
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160 if (decrypt) {
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161 /* Need to read in IV */
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162 if (fread(IV,1,ivsize,fdin) != ivsize) {
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163 printf("Error reading IV from input.\n");
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164 exit(-1);
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165 }
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166
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167 if ((errno = ctr_start(cipher_idx,IV,key,ks,0,&ctr)) != CRYPT_OK) {
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168 printf("ctr_start error: %s\n",error_to_string(errno));
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169 exit(-1);
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170 }
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171
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172 /* IV done */
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173 do {
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174 y = fread(inbuf,1,sizeof(inbuf),fdin);
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175
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176 if ((errno = ctr_decrypt(inbuf,plaintext,y,&ctr)) != CRYPT_OK) {
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177 printf("ctr_decrypt error: %s\n", error_to_string(errno));
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178 exit(-1);
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179 }
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180
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181 if (fwrite(plaintext,1,y,fdout) != y) {
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182 printf("Error writing to file.\n");
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183 exit(-1);
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184 }
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185 } while (y == sizeof(inbuf));
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186 fclose(fdin);
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187 fclose(fdout);
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188
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189 } else { /* encrypt */
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190 /* Setup yarrow for random bytes for IV */
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191
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192 if ((errno = rng_make_prng(128, find_prng("yarrow"), &prng, NULL)) != CRYPT_OK) {
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193 printf("Error setting up PRNG, %s\n", error_to_string(errno));
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194 }
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195
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196 /* You can use rng_get_bytes on platforms that support it */
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197 /* x = rng_get_bytes(IV,ivsize,NULL);*/
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198 x = yarrow_read(IV,ivsize,&prng);
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199 if (x != ivsize) {
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200 printf("Error reading PRNG for IV required.\n");
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diff changeset
201 exit(-1);
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diff changeset
202 }
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diff changeset
203
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204 if (fwrite(IV,1,ivsize,fdout) != ivsize) {
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205 printf("Error writing IV to output.\n");
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206 exit(-1);
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207 }
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208
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209 if ((errno = ctr_start(cipher_idx,IV,key,ks,0,&ctr)) != CRYPT_OK) {
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diff changeset
210 printf("ctr_start error: %s\n",error_to_string(errno));
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diff changeset
211 exit(-1);
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diff changeset
212 }
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diff changeset
213
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diff changeset
214 do {
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diff changeset
215 y = fread(inbuf,1,sizeof(inbuf),fdin);
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diff changeset
216
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217 if ((errno = ctr_encrypt(inbuf,ciphertext,y,&ctr)) != CRYPT_OK) {
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diff changeset
218 printf("ctr_encrypt error: %s\n", error_to_string(errno));
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diff changeset
219 exit(-1);
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diff changeset
220 }
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diff changeset
221
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diff changeset
222 if (fwrite(ciphertext,1,y,fdout) != y) {
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diff changeset
223 printf("Error writing to output.\n");
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diff changeset
224 exit(-1);
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diff changeset
225 }
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diff changeset
226 } while (y == sizeof(inbuf));
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diff changeset
227 fclose(fdout);
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diff changeset
228 fclose(fdin);
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diff changeset
229 }
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230 return 0;
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diff changeset
231 }