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1 /* crypto/rsa/rsa_pk1.c */ |
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2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
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3 * All rights reserved. |
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4 * |
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5 * This package is an SSL implementation written |
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6 * by Eric Young (eay@cryptsoft.com). |
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7 * The implementation was written so as to conform with Netscapes SSL. |
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8 * |
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9 * This library is free for commercial and non-commercial use as long as |
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10 * the following conditions are aheared to. The following conditions |
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11 * apply to all code found in this distribution, be it the RC4, RSA, |
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12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
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13 * included with this distribution is covered by the same copyright terms |
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14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
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15 * |
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16 * Copyright remains Eric Young's, and as such any Copyright notices in |
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17 * the code are not to be removed. |
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18 * If this package is used in a product, Eric Young should be given attribution |
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19 * as the author of the parts of the library used. |
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20 * This can be in the form of a textual message at program startup or |
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21 * in documentation (online or textual) provided with the package. |
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22 * |
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23 * Redistribution and use in source and binary forms, with or without |
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24 * modification, are permitted provided that the following conditions |
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25 * are met: |
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26 * 1. Redistributions of source code must retain the copyright |
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27 * notice, this list of conditions and the following disclaimer. |
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28 * 2. Redistributions in binary form must reproduce the above copyright |
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29 * notice, this list of conditions and the following disclaimer in the |
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30 * documentation and/or other materials provided with the distribution. |
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31 * 3. All advertising materials mentioning features or use of this software |
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32 * must display the following acknowledgement: |
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33 * "This product includes cryptographic software written by |
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34 * Eric Young (eay@cryptsoft.com)" |
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35 * The word 'cryptographic' can be left out if the rouines from the library |
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36 * being used are not cryptographic related :-). |
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37 * 4. If you include any Windows specific code (or a derivative thereof) from |
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38 * the apps directory (application code) you must include an acknowledgement: |
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39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
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40 * |
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41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
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42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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51 * SUCH DAMAGE. |
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52 * |
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53 * The licence and distribution terms for any publically available version or |
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54 * derivative of this code cannot be changed. i.e. this code cannot simply be |
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55 * copied and put under another distribution licence |
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56 * [including the GNU Public Licence.] |
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57 */ |
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58 |
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59 #include <stdio.h> |
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60 #include "cryptlib.h" |
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61 #include <openssl/bn.h> |
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62 #include <openssl/rsa.h> |
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63 #include <openssl/rand.h> |
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64 |
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65 EXPORT_C int RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen, |
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66 const unsigned char *from, int flen) |
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67 { |
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68 int j; |
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69 unsigned char *p; |
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70 |
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71 if (flen > (tlen-RSA_PKCS1_PADDING_SIZE)) |
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72 { |
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73 RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_1,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); |
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74 return(0); |
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75 } |
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76 |
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77 p=(unsigned char *)to; |
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78 |
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79 *(p++)=0; |
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80 *(p++)=1; /* Private Key BT (Block Type) */ |
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81 |
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82 /* pad out with 0xff data */ |
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83 j=tlen-3-flen; |
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84 memset(p,0xff,j); |
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85 p+=j; |
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86 *(p++)='\0'; |
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87 memcpy(p,from,(unsigned int)flen); |
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88 return(1); |
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89 } |
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90 |
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91 EXPORT_C int RSA_padding_check_PKCS1_type_1(unsigned char *to, int tlen, |
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92 const unsigned char *from, int flen, int num) |
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93 { |
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94 int i,j; |
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95 const unsigned char *p; |
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96 |
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97 p=from; |
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98 if ((num != (flen+1)) || (*(p++) != 01)) |
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99 { |
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100 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BLOCK_TYPE_IS_NOT_01); |
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101 return(-1); |
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102 } |
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103 |
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104 /* scan over padding data */ |
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105 j=flen-1; /* one for type. */ |
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106 for (i=0; i<j; i++) |
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107 { |
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108 if (*p != 0xff) /* should decrypt to 0xff */ |
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109 { |
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110 if (*p == 0) |
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111 { p++; break; } |
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112 else { |
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113 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BAD_FIXED_HEADER_DECRYPT); |
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114 return(-1); |
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115 } |
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116 } |
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117 p++; |
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118 } |
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119 |
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120 if (i == j) |
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121 { |
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122 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_NULL_BEFORE_BLOCK_MISSING); |
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123 return(-1); |
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124 } |
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125 |
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126 if (i < 8) |
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127 { |
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128 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BAD_PAD_BYTE_COUNT); |
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129 return(-1); |
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130 } |
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131 i++; /* Skip over the '\0' */ |
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132 j-=i; |
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133 if (j > tlen) |
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134 { |
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135 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_DATA_TOO_LARGE); |
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136 return(-1); |
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137 } |
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138 memcpy(to,p,(unsigned int)j); |
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139 |
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140 return(j); |
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141 } |
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142 |
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143 EXPORT_C int RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen, |
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144 const unsigned char *from, int flen) |
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145 { |
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146 int i,j; |
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147 unsigned char *p; |
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148 |
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149 if (flen > (tlen-11)) |
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150 { |
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151 RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_2,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); |
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152 return(0); |
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153 } |
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154 |
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155 p=(unsigned char *)to; |
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156 |
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157 *(p++)=0; |
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158 *(p++)=2; /* Public Key BT (Block Type) */ |
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159 |
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160 /* pad out with non-zero random data */ |
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161 j=tlen-3-flen; |
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162 |
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163 if (RAND_bytes(p,j) <= 0) |
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164 return(0); |
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165 for (i=0; i<j; i++) |
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166 { |
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167 if (*p == '\0') |
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168 do { |
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169 if (RAND_bytes(p,1) <= 0) |
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170 return(0); |
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171 } while (*p == '\0'); |
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172 p++; |
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173 } |
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174 |
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175 *(p++)='\0'; |
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176 |
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177 memcpy(p,from,(unsigned int)flen); |
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178 return(1); |
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179 } |
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180 |
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181 EXPORT_C int RSA_padding_check_PKCS1_type_2(unsigned char *to, int tlen, |
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182 const unsigned char *from, int flen, int num) |
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183 { |
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184 int i,j; |
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185 const unsigned char *p; |
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186 |
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187 p=from; |
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188 if ((num != (flen+1)) || (*(p++) != 02)) |
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189 { |
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190 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_BLOCK_TYPE_IS_NOT_02); |
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191 return(-1); |
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192 } |
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193 #ifdef PKCS1_CHECK |
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194 return(num-11); |
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195 #endif |
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196 |
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197 /* scan over padding data */ |
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198 j=flen-1; /* one for type. */ |
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199 for (i=0; i<j; i++) |
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200 if (*(p++) == 0) break; |
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201 |
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202 if (i == j) |
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203 { |
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204 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_NULL_BEFORE_BLOCK_MISSING); |
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205 return(-1); |
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206 } |
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207 |
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208 if (i < 8) |
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209 { |
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210 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_BAD_PAD_BYTE_COUNT); |
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211 return(-1); |
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212 } |
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213 i++; /* Skip over the '\0' */ |
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214 j-=i; |
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215 if (j > tlen) |
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216 { |
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217 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_DATA_TOO_LARGE); |
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218 return(-1); |
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219 } |
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220 memcpy(to,p,(unsigned int)j); |
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221 |
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222 return(j); |
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223 } |
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224 |