Mercurial > dropbear
annotate libtomcrypt/demos/openssl-enc.c @ 1938:77bc00dcc19f default tip main master
Bump version to 2022.82
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 01 Apr 2022 14:43:27 +0800 |
parents | 6dba84798cd5 |
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rev | line source |
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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 /* |
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11 * Demo to do the rough equivalent of: |
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12 * |
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13 * openssl enc -aes-256-cbc -pass pass:foobar -in infile -out outfile -p |
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14 * |
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15 * Compilation: |
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16 * |
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17 * $(CC) -I /path/to/headers -L .../libs \ |
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18 * -o openssl-enc \ |
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19 * openssl-enc.c -ltomcrypt |
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20 * |
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21 * Usage: |
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22 * |
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23 * ./openssl-enc <enc|dec> infile outfile "passphrase" [salt] |
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24 * |
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25 * If provided, the salt must be EXACTLY a 16-char hex string. |
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26 * |
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27 * Demo is an example of: |
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28 * |
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29 * - (When decrypting) yanking salt out of the OpenSSL "Salted__..." header |
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30 * - OpenSSL-compatible key derivation (in OpenSSL's modified PKCS#5v1 approach) |
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31 * - Grabbing an Initialization Vector from the key generator |
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32 * - Performing simple block encryption using AES |
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33 * - PKCS#7-type padding (which hopefully can get ripped out of this demo and |
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34 * made a libtomcrypt thing someday). |
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35 * |
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36 * This program is free for all purposes without any express guarantee it |
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37 * works. If you really want to see a license here, assume the WTFPL :-) |
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38 * |
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39 * BJ Black, [email protected], https://wjblack.com |
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40 * |
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41 * BUGS: |
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42 * Passing a password on a command line is a HORRIBLE idea. Don't use |
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43 * this program for serious work! |
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44 */ |
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45 |
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46 #include <tomcrypt.h> |
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47 |
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48 #ifndef LTC_RIJNDAEL |
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49 #error Cannot compile this demo; Rijndael (AES) required |
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50 #endif |
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51 #ifndef LTC_CBC_MODE |
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52 #error Cannot compile this demo; CBC mode required |
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53 #endif |
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54 #ifndef LTC_PKCS_5 |
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55 #error Cannot compile this demo; PKCS5 required |
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56 #endif |
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57 #ifndef LTC_RNG_GET_BYTES |
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58 #error Cannot compile this demo; random generator required |
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59 #endif |
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60 #ifndef LTC_MD5 |
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61 #error Cannot compile this demo; MD5 required |
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62 #endif |
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63 |
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64 /* OpenSSL by default only runs one hash round */ |
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65 #define OPENSSL_ITERATIONS 1 |
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66 /* Use aes-256-cbc, so 256 bits of key, 128 of IV */ |
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67 #define KEY_LENGTH (256>>3) |
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68 #define IV_LENGTH (128>>3) |
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69 /* PKCS#5v1 requires exactly an 8-byte salt */ |
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70 #define SALT_LENGTH 8 |
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71 /* The header OpenSSL puts on an encrypted file */ |
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72 static char salt_header[] = { 'S', 'a', 'l', 't', 'e', 'd', '_', '_' }; |
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73 |
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74 #include <errno.h> |
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75 #include <stdio.h> |
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76 #include <string.h> |
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77 |
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78 /* A simple way to handle the possibility that a block may increase in size |
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79 after padding. */ |
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80 union paddable { |
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81 unsigned char unpad[1024]; |
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82 unsigned char pad[1024+MAXBLOCKSIZE]; |
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83 }; |
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84 |
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85 /* |
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86 * Print usage and exit with a bad status (and perror() if any errno). |
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87 * |
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88 * Input: argv[0] and the error string |
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89 * Output: <no return> |
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90 * Side Effects: print messages and barf (does exit(3)) |
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91 */ |
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92 void barf(const char *pname, const char *err) |
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93 { |
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94 printf("Usage: %s <enc|dec> infile outfile passphrase [salt]\n", pname); |
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95 printf("\n"); |
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96 printf(" # encrypts infile->outfile, random salt\n"); |
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97 printf(" %s enc infile outfile \"passphrase\"\n", pname); |
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98 printf("\n"); |
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99 printf(" # encrypts infile->outfile, salt from cmdline\n"); |
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100 printf(" %s enc infile outfile pass 0123456789abcdef\n", pname); |
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101 printf("\n"); |
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102 printf(" # decrypts infile->outfile, pulls salt from infile\n"); |
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103 printf(" %s dec infile outfile pass\n", pname); |
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104 printf("\n"); |
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105 printf(" # decrypts infile->outfile, salt specified\n"); |
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106 printf(" # (don't try to read the salt from infile)\n"); |
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107 printf(" %s dec infile outfile pass 0123456789abcdef" |
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108 "\n", pname); |
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109 printf("\n"); |
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110 printf("Application Error: %s\n", err); |
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111 if(errno) |
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112 perror(" System Error"); |
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113 exit(-1); |
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114 } |
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115 |
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116 /* |
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117 * Parse a salt value passed in on the cmdline. |
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118 * |
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119 * Input: string passed in and a buf to put it in (exactly 8 bytes!) |
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120 * Output: CRYPT_OK if parsed OK, CRYPT_ERROR if not |
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121 * Side Effects: none |
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122 */ |
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123 int parse_hex_salt(unsigned char *in, unsigned char *out) |
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124 { |
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125 int idx; |
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126 for(idx=0; idx<SALT_LENGTH; idx++) |
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127 if(sscanf((char*)in+idx*2, "%02hhx", out+idx) != 1) |
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128 return CRYPT_ERROR; |
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129 return CRYPT_OK; |
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130 } |
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131 |
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132 /* |
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133 * Parse the Salted__[+8 bytes] from an OpenSSL-compatible file header. |
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134 * |
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135 * Input: file to read from and a to put the salt in (exactly 8 bytes!) |
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136 * Output: CRYPT_OK if parsed OK, CRYPT_ERROR if not |
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137 * Side Effects: infile's read pointer += 16 |
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138 */ |
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139 int parse_openssl_header(FILE *in, unsigned char *out) |
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140 { |
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141 unsigned char tmp[SALT_LENGTH]; |
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142 if(fread(tmp, 1, sizeof(tmp), in) != sizeof(tmp)) |
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143 return CRYPT_ERROR; |
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144 if(memcmp(tmp, salt_header, sizeof(tmp))) |
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145 return CRYPT_ERROR; |
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146 if(fread(tmp, 1, sizeof(tmp), in) != sizeof(tmp)) |
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147 return CRYPT_ERROR; |
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148 memcpy(out, tmp, sizeof(tmp)); |
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149 return CRYPT_OK; |
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150 } |
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151 |
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152 /* |
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153 * Dump a hexed stream of bytes (convenience func). |
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154 * |
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155 * Input: buf to read from, length |
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156 * Output: none |
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157 * Side Effects: bytes printed as a hex blob, no lf at the end |
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158 */ |
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159 void dump_bytes(unsigned char *in, unsigned long len) |
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160 { |
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161 unsigned long idx; |
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162 for(idx=0; idx<len; idx++) |
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163 printf("%02hhX", *(in+idx)); |
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164 } |
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165 |
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166 /* |
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167 * Pad or unpad a message using PKCS#7 padding. |
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168 * Padding will add 1-(blocksize) bytes and unpadding will remove that amount. |
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169 * Set is_padding to 1 to pad, 0 to unpad. |
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170 * |
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171 * Input: paddable buffer, size read, block length of cipher, mode |
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172 * Output: number of bytes after padding resp. after unpadding |
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173 * Side Effects: none |
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174 */ |
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175 size_t pkcs7_pad(union paddable *buf, size_t nb, int block_length, |
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176 int is_padding) |
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177 { |
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178 unsigned char padval; |
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179 off_t idx; |
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180 |
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181 if(is_padding) { |
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182 /* We are PADDING this block (and therefore adding bytes) */ |
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183 /* The pad value in PKCS#7 is the number of bytes remaining in |
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184 the block, so for a 16-byte block and 3 bytes left, it's |
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185 0x030303. In the oddball case where nb is an exact multiple |
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186 multiple of block_length, set the padval to blocksize (i.e. |
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187 add one full block) */ |
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188 padval = (unsigned char) (block_length - (nb % block_length)); |
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189 padval = padval ? padval : block_length; |
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190 |
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191 memset(buf->pad+nb, padval, padval); |
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192 return nb+padval; |
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193 } else { |
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194 /* We are UNPADDING this block (and removing bytes) |
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195 We really just need to verify that the pad bytes are correct, |
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196 so start at the end of the string and work backwards. */ |
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197 |
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198 /* Figure out what the padlength should be by looking at the |
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199 last byte */ |
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200 idx = nb-1; |
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201 padval = buf->pad[idx]; |
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202 |
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203 /* padval must be nonzero and <= block length */ |
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204 if(padval <= 0 || padval > block_length) |
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205 return 0; |
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206 |
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207 /* First byte's accounted for; do the rest */ |
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208 idx--; |
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209 |
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210 while(idx >= (off_t)(nb-padval)) |
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211 if(buf->pad[idx] != padval) |
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212 return 0; |
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213 else |
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214 idx--; |
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215 |
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216 /* If we got here, the pad checked out, so return a smaller |
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217 number of bytes than nb (basically where we left off+1) */ |
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218 return idx+1; |
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219 } |
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220 } |
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221 |
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222 /* |
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223 * Perform an encrypt/decrypt operation to/from files using AES+CBC+PKCS7 pad. |
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224 * Set encrypt to 1 to encrypt, 0 to decrypt. |
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225 * |
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226 * Input: in/out files, key, iv, and mode |
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227 * Output: CRYPT_OK if no error |
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228 * Side Effects: bytes slurped from infile, pushed to outfile, fds updated. |
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229 */ |
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230 int do_crypt(FILE *infd, FILE *outfd, unsigned char *key, unsigned char *iv, |
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231 int encrypt) |
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232 { |
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233 union paddable inbuf, outbuf; |
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234 int cipher, ret; |
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235 symmetric_CBC cbc; |
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236 size_t nb; |
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237 |
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238 /* Register your cipher! */ |
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239 cipher = register_cipher(&aes_desc); |
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240 if(cipher == -1) |
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241 return CRYPT_INVALID_CIPHER; |
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242 |
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243 /* Start a CBC session with cipher/key/val params */ |
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244 ret = cbc_start(cipher, iv, key, KEY_LENGTH, 0, &cbc); |
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245 if( ret != CRYPT_OK ) |
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246 return -1; |
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247 |
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248 do { |
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249 /* Get bytes from the source */ |
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250 nb = fread(inbuf.unpad, 1, sizeof(inbuf.unpad), infd); |
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251 if(!nb) |
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252 return encrypt ? CRYPT_OK : CRYPT_ERROR; |
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253 |
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254 /* Barf if we got a read error */ |
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255 if(ferror(infd)) |
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256 return CRYPT_ERROR; |
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257 |
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258 if(encrypt) { |
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259 /* We're encrypting, so pad first (if at EOF) and then |
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260 crypt */ |
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261 if(feof(infd)) |
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262 nb = pkcs7_pad(&inbuf, nb, |
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263 aes_desc.block_length, 1); |
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264 |
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265 ret = cbc_encrypt(inbuf.pad, outbuf.pad, nb, &cbc); |
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266 if(ret != CRYPT_OK) |
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267 return ret; |
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268 |
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269 } else { |
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270 /* We're decrypting, so decrypt and then unpad if at |
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271 EOF */ |
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272 ret = cbc_decrypt(inbuf.unpad, outbuf.unpad, nb, &cbc); |
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273 if( ret != CRYPT_OK ) |
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274 return ret; |
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275 |
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276 if( feof(infd) ) |
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277 nb = pkcs7_pad(&outbuf, nb, |
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278 aes_desc.block_length, 0); |
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279 if(nb == 0) |
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280 /* The file didn't decrypt correctly */ |
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281 return CRYPT_ERROR; |
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282 |
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283 } |
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284 |
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285 /* Push bytes to outfile */ |
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286 if(fwrite(outbuf.unpad, 1, nb, outfd) != nb) |
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287 return CRYPT_ERROR; |
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288 |
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289 } while(!feof(infd)); |
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290 |
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291 /* Close up */ |
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292 cbc_done(&cbc); |
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293 |
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294 return CRYPT_OK; |
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295 } |
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296 |
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297 /* Convenience macro for the various barfable places below */ |
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298 #define BARF(a) { \ |
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299 if(infd) fclose(infd); \ |
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300 if(outfd) { fclose(outfd); remove(argv[3]); } \ |
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301 barf(argv[0], a); \ |
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302 } |
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303 /* |
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304 * The main routine. Mostly validate cmdline params, open files, run the KDF, |
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305 * and do the crypt. |
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306 */ |
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307 int main(int argc, char *argv[]) { |
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308 unsigned char salt[SALT_LENGTH]; |
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309 FILE *infd = NULL, *outfd = NULL; |
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310 int encrypt = -1; |
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311 int hash = -1; |
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312 int ret; |
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313 unsigned char keyiv[KEY_LENGTH + IV_LENGTH]; |
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314 unsigned long keyivlen = (KEY_LENGTH + IV_LENGTH); |
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315 unsigned char *key, *iv; |
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316 |
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317 /* Check proper number of cmdline args */ |
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318 if(argc < 5 || argc > 6) |
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319 BARF("Invalid number of arguments"); |
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320 |
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321 /* Check proper mode of operation */ |
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322 if (!strncmp(argv[1], "enc", 3)) |
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323 encrypt = 1; |
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324 else if(!strncmp(argv[1], "dec", 3)) |
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325 encrypt = 0; |
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326 else |
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327 BARF("Bad command name"); |
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328 |
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329 /* Check we can open infile/outfile */ |
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330 infd = fopen(argv[2], "rb"); |
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331 if(infd == NULL) |
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332 BARF("Could not open infile"); |
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333 outfd = fopen(argv[3], "wb"); |
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334 if(outfd == NULL) |
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335 BARF("Could not open outfile"); |
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336 |
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337 /* Get the salt from wherever */ |
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338 if(argc == 6) { |
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339 /* User-provided */ |
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340 if(parse_hex_salt((unsigned char*) argv[5], salt) != CRYPT_OK) |
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341 BARF("Bad user-specified salt"); |
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342 } else if(!strncmp(argv[1], "enc", 3)) { |
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343 /* Encrypting; get from RNG */ |
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344 if(rng_get_bytes(salt, sizeof(salt), NULL) != sizeof(salt)) |
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345 BARF("Not enough random data"); |
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346 } else { |
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347 /* Parse from infile (decrypt only) */ |
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348 if(parse_openssl_header(infd, salt) != CRYPT_OK) |
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349 BARF("Invalid OpenSSL header in infile"); |
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350 } |
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351 |
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352 /* Fetch the MD5 hasher for PKCS#5 */ |
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353 hash = register_hash(&md5_desc); |
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354 if(hash == -1) |
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355 BARF("Could not register MD5 hash"); |
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356 |
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357 /* Set things to a sane initial state */ |
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358 zeromem(keyiv, sizeof(keyiv)); |
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359 key = keyiv + 0; /* key comes first */ |
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360 iv = keyiv + KEY_LENGTH; /* iv comes next */ |
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361 |
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362 /* Run the key derivation from the provided passphrase. This gets us |
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363 the key and iv. */ |
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364 ret = pkcs_5_alg1_openssl((unsigned char*)argv[4], strlen(argv[4]), salt, |
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365 OPENSSL_ITERATIONS, hash, keyiv, &keyivlen ); |
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366 if(ret != CRYPT_OK) |
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367 BARF("Could not derive key/iv from passphrase"); |
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368 |
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369 /* Display the salt/key/iv like OpenSSL cmdline does when -p */ |
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370 printf("salt="); dump_bytes(salt, sizeof(salt)); printf("\n"); |
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371 printf("key="); dump_bytes(key, KEY_LENGTH); printf("\n"); |
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372 printf("iv ="); dump_bytes(iv, IV_LENGTH ); printf("\n"); |
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373 |
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374 /* If we're encrypting, write the salt header as OpenSSL does */ |
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375 if(!strncmp(argv[1], "enc", 3)) { |
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376 if(fwrite(salt_header, 1, sizeof(salt_header), outfd) != |
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377 sizeof(salt_header) ) |
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378 BARF("Error writing salt header to outfile"); |
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379 if(fwrite(salt, 1, sizeof(salt), outfd) != sizeof(salt)) |
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380 BARF("Error writing salt to outfile"); |
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381 } |
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382 |
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383 /* At this point, the files are open, the salt has been figured out, |
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384 and we're ready to pump data through crypt. */ |
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385 |
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386 /* Do the crypt operation */ |
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387 if(do_crypt(infd, outfd, key, iv, encrypt) != CRYPT_OK) |
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388 BARF("Error during crypt operation"); |
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389 |
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390 /* Clean up */ |
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391 fclose(infd); fclose(outfd); |
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392 return 0; |
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393 } |
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394 |
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395 /* ref: $Format:%D$ */ |
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396 /* git commit: $Format:%H$ */ |
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397 /* commit time: $Format:%ai$ */ |