Mercurial > dropbear
annotate rsa.c @ 211:f01f0400314d libtomcrypt
disapproval of revision 6a39eb8b36778460fca83b8149df2a8b6d3327fd
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 06 Jul 2005 13:23:45 +0000 |
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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 * Tom St Denis, [email protected], http://libtomcrypt.org |
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10 */ |
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11 |
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12 /* RSA Code by Tom St Denis */ |
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13 #include "mycrypt.h" |
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14 |
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15 #ifdef MRSA |
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16 |
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17 int rsa_signpad(const unsigned char *in, unsigned long inlen, |
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18 unsigned char *out, unsigned long *outlen) |
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19 { |
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20 unsigned long x, y; |
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21 |
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22 _ARGCHK(in != NULL); |
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23 _ARGCHK(out != NULL); |
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24 _ARGCHK(outlen != NULL); |
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25 |
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26 if (*outlen < (3 * inlen)) { |
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27 return CRYPT_BUFFER_OVERFLOW; |
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28 } |
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29 |
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30 /* check inlen */ |
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31 if (inlen > MAX_RSA_SIZE/8) { |
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32 return CRYPT_PK_INVALID_SIZE; |
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33 } |
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34 |
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35 for (y = x = 0; x < inlen; x++) |
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36 out[y++] = (unsigned char)0xFF; |
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37 for (x = 0; x < inlen; x++) |
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38 out[y++] = in[x]; |
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39 for (x = 0; x < inlen; x++) |
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40 out[y++] = (unsigned char)0xFF; |
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41 *outlen = 3 * inlen; |
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42 return CRYPT_OK; |
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43 } |
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44 |
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45 int rsa_pad(const unsigned char *in, unsigned long inlen, |
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46 unsigned char *out, unsigned long *outlen, |
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47 int wprng, prng_state *prng) |
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48 { |
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49 unsigned char buf[3*(MAX_RSA_SIZE/8)]; |
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50 unsigned long x; |
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51 int err; |
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52 |
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53 _ARGCHK(in != NULL); |
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54 _ARGCHK(out != NULL); |
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55 _ARGCHK(outlen != NULL); |
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56 |
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57 /* is output big enough? */ |
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58 if (*outlen < (3 * inlen)) { |
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59 return CRYPT_BUFFER_OVERFLOW; |
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60 } |
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61 |
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62 /* get random padding required */ |
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63 if ((err = prng_is_valid(wprng)) != CRYPT_OK) { |
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64 return err; |
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65 } |
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66 |
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67 /* check inlen */ |
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68 if (inlen > (MAX_RSA_SIZE/8)) { |
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69 return CRYPT_PK_INVALID_SIZE; |
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70 } |
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71 |
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72 if (prng_descriptor[wprng].read(buf, inlen*2-2, prng) != (inlen*2 - 2)) { |
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73 return CRYPT_ERROR_READPRNG; |
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74 } |
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75 |
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76 /* pad it like a sandwhich |
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77 * |
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78 * Looks like 0xFF R1 M R2 0xFF |
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79 * |
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80 * Where R1/R2 are random and exactly equal to the length of M minus one byte. |
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81 */ |
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82 for (x = 0; x < inlen-1; x++) { |
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83 out[x+1] = buf[x]; |
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84 } |
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85 |
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86 for (x = 0; x < inlen; x++) { |
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87 out[x+inlen] = in[x]; |
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88 } |
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89 |
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90 for (x = 0; x < inlen-1; x++) { |
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91 out[x+inlen+inlen] = buf[x+inlen-1]; |
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92 } |
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93 |
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94 /* last and first bytes are 0xFF */ |
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95 out[0] = out[inlen+inlen+inlen-1] = (unsigned char)0xFF; |
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96 |
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97 /* clear up and return */ |
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98 #ifdef CLEAN_STACK |
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99 zeromem(buf, sizeof(buf)); |
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100 #endif |
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101 *outlen = inlen*3; |
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102 return CRYPT_OK; |
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103 } |
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104 |
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105 int rsa_signdepad(const unsigned char *in, unsigned long inlen, |
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106 unsigned char *out, unsigned long *outlen) |
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107 { |
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108 unsigned long x; |
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109 |
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110 _ARGCHK(in != NULL); |
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111 _ARGCHK(out != NULL); |
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112 _ARGCHK(outlen != NULL); |
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113 |
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114 if (*outlen < inlen/3) { |
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115 return CRYPT_BUFFER_OVERFLOW; |
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116 } |
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117 |
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118 /* check padding bytes */ |
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119 for (x = 0; x < inlen/3; x++) { |
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120 if (in[x] != (unsigned char)0xFF || in[x+(inlen/3)+(inlen/3)] != (unsigned char)0xFF) { |
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121 return CRYPT_INVALID_PACKET; |
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122 } |
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123 } |
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124 for (x = 0; x < inlen/3; x++) { |
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125 out[x] = in[x+(inlen/3)]; |
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126 } |
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127 *outlen = inlen/3; |
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128 return CRYPT_OK; |
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129 } |
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130 |
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131 int rsa_depad(const unsigned char *in, unsigned long inlen, |
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132 unsigned char *out, unsigned long *outlen) |
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133 { |
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134 unsigned long x; |
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135 |
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136 _ARGCHK(in != NULL); |
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137 _ARGCHK(out != NULL); |
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138 _ARGCHK(outlen != NULL); |
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139 |
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140 if (*outlen < inlen/3) { |
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141 return CRYPT_BUFFER_OVERFLOW; |
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142 } |
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143 for (x = 0; x < inlen/3; x++) { |
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144 out[x] = in[x+(inlen/3)]; |
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145 } |
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146 *outlen = inlen/3; |
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147 return CRYPT_OK; |
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148 } |
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149 |
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150 int rsa_export(unsigned char *out, unsigned long *outlen, int type, rsa_key *key) |
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151 { |
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152 unsigned long y, z; |
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153 int err; |
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154 |
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155 _ARGCHK(out != NULL); |
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156 _ARGCHK(outlen != NULL); |
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157 _ARGCHK(key != NULL); |
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158 |
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159 /* can we store the static header? */ |
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160 if (*outlen < (PACKET_SIZE + 1)) { |
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161 return CRYPT_BUFFER_OVERFLOW; |
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162 } |
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163 |
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164 /* type valid? */ |
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165 if (!(key->type == PK_PRIVATE || key->type == PK_PRIVATE_OPTIMIZED) && |
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166 (type == PK_PRIVATE || type == PK_PRIVATE_OPTIMIZED)) { |
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167 return CRYPT_PK_INVALID_TYPE; |
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168 } |
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169 |
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170 /* start at offset y=PACKET_SIZE */ |
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171 y = PACKET_SIZE; |
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172 |
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173 /* output key type */ |
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174 out[y++] = type; |
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175 |
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176 /* output modulus */ |
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177 OUTPUT_BIGNUM(&key->N, out, y, z); |
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178 |
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179 /* output public key */ |
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180 OUTPUT_BIGNUM(&key->e, out, y, z); |
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181 |
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182 if (type == PK_PRIVATE || type == PK_PRIVATE_OPTIMIZED) { |
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183 OUTPUT_BIGNUM(&key->d, out, y, z); |
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184 } |
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185 |
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186 if (type == PK_PRIVATE_OPTIMIZED) { |
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187 OUTPUT_BIGNUM(&key->dQ, out, y, z); |
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188 OUTPUT_BIGNUM(&key->dP, out, y, z); |
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189 OUTPUT_BIGNUM(&key->pQ, out, y, z); |
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190 OUTPUT_BIGNUM(&key->qP, out, y, z); |
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191 OUTPUT_BIGNUM(&key->p, out, y, z); |
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192 OUTPUT_BIGNUM(&key->q, out, y, z); |
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193 } |
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194 |
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195 /* store packet header */ |
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196 packet_store_header(out, PACKET_SECT_RSA, PACKET_SUB_KEY); |
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197 |
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198 /* copy to the user buffer */ |
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199 *outlen = y; |
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200 |
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201 /* clear stack and return */ |
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202 return CRYPT_OK; |
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203 } |
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204 |
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205 int rsa_import(const unsigned char *in, unsigned long inlen, rsa_key *key) |
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206 { |
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207 unsigned long x, y; |
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208 int err; |
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209 |
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210 _ARGCHK(in != NULL); |
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211 _ARGCHK(key != NULL); |
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212 |
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213 /* check length */ |
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214 if (inlen < (1+PACKET_SIZE)) { |
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215 return CRYPT_INVALID_PACKET; |
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216 } |
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217 |
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218 /* test packet header */ |
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219 if ((err = packet_valid_header((unsigned char *)in, PACKET_SECT_RSA, PACKET_SUB_KEY)) != CRYPT_OK) { |
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220 return err; |
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221 } |
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222 |
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223 /* init key */ |
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224 if ((err = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ, &key->dP, &key->qP, |
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225 &key->pQ, &key->p, &key->q, NULL)) != MP_OKAY) { |
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226 return mpi_to_ltc_error(err); |
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227 } |
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228 |
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229 /* get key type */ |
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230 y = PACKET_SIZE; |
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231 key->type = (int)in[y++]; |
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232 |
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233 /* load the modulus */ |
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234 INPUT_BIGNUM(&key->N, in, x, y, inlen); |
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235 |
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236 /* load public exponent */ |
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237 INPUT_BIGNUM(&key->e, in, x, y, inlen); |
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238 |
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239 /* get private exponent */ |
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240 if (key->type == PK_PRIVATE || key->type == PK_PRIVATE_OPTIMIZED) { |
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241 INPUT_BIGNUM(&key->d, in, x, y, inlen); |
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242 } |
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243 |
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244 /* get CRT private data if required */ |
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245 if (key->type == PK_PRIVATE_OPTIMIZED) { |
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246 INPUT_BIGNUM(&key->dQ, in, x, y, inlen); |
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247 INPUT_BIGNUM(&key->dP, in, x, y, inlen); |
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248 INPUT_BIGNUM(&key->pQ, in, x, y, inlen); |
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249 INPUT_BIGNUM(&key->qP, in, x, y, inlen); |
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250 INPUT_BIGNUM(&key->p, in, x, y, inlen); |
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251 INPUT_BIGNUM(&key->q, in, x, y, inlen); |
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252 } |
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253 |
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254 /* free up ram not required */ |
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255 if (key->type != PK_PRIVATE_OPTIMIZED) { |
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256 mp_clear_multi(&key->dQ, &key->dP, &key->pQ, &key->qP, &key->p, &key->q, NULL); |
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257 } |
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258 if (key->type != PK_PRIVATE && key->type != PK_PRIVATE_OPTIMIZED) { |
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259 mp_clear(&key->d); |
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260 } |
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261 |
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262 return CRYPT_OK; |
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263 error: |
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264 mp_clear_multi(&key->d, &key->e, &key->N, &key->dQ, &key->dP, |
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265 &key->pQ, &key->qP, &key->p, &key->q, NULL); |
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266 return err; |
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267 } |
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268 |
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269 #include "rsa_sys.c" |
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270 |
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271 #endif /* RSA */ |
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272 |
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273 |