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annotate libtomcrypt/demos/ltcrypt.c @ 1607:0bdbb9ecc403

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avoid leak of ecdh public key
author Matt Johnston <matt@ucc.asn.au>
date Thu, 08 Mar 2018 23:51:33 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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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204 /* git commit: $Format:%H$ */
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205 /* commit time: $Format:%ai$ */