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annotate rsa.c @ 89:cecb105ff479 libtomcrypt

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Fix for big-endian load/store macros
author Matt Johnston <matt@ucc.asn.au>
date Fri, 03 Sep 2004 08:31:12 +0000
parents d7da3b1e1540
children
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0
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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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diff changeset
141 return CRYPT_BUFFER_OVERFLOW;
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142 }
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diff changeset
143 for (x = 0; x < inlen/3; x++) {
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diff changeset
144 out[x] = in[x+(inlen/3)];
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145 }
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diff changeset
146 *outlen = inlen/3;
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diff changeset
147 return CRYPT_OK;
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diff changeset
148 }
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149
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diff changeset
150 int rsa_export(unsigned char *out, unsigned long *outlen, int type, rsa_key *key)
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diff changeset
151 {
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diff changeset
152 unsigned long y, z;
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diff changeset
153 int err;
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154
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155 _ARGCHK(out != NULL);
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diff changeset
156 _ARGCHK(outlen != NULL);
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diff changeset
157 _ARGCHK(key != NULL);
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diff changeset
158
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159 /* can we store the static header? */
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diff changeset
160 if (*outlen < (PACKET_SIZE + 1)) {
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161 return CRYPT_BUFFER_OVERFLOW;
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162 }
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diff changeset
163
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diff changeset
164 /* type valid? */
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diff changeset
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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diff changeset
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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diff changeset
172
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173 /* output key type */
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diff changeset
174 out[y++] = type;
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diff changeset
175
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diff changeset
176 /* output modulus */
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diff changeset
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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diff changeset
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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diff changeset
183 OUTPUT_BIGNUM(&key->d, out, y, z);
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184 }
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185
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diff changeset
186 if (type == PK_PRIVATE_OPTIMIZED) {
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diff changeset
187 OUTPUT_BIGNUM(&key->dQ, out, y, z);
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diff changeset
188 OUTPUT_BIGNUM(&key->dP, out, y, z);
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diff changeset
189 OUTPUT_BIGNUM(&key->pQ, out, y, z);
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diff changeset
190 OUTPUT_BIGNUM(&key->qP, out, y, z);
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diff changeset
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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diff changeset
194
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diff changeset
195 /* store packet header */
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diff changeset
196 packet_store_header(out, PACKET_SECT_RSA, PACKET_SUB_KEY);
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diff changeset
197
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diff changeset
198 /* copy to the user buffer */
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diff changeset
199 *outlen = y;
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diff changeset
200
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diff changeset
201 /* clear stack and return */
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diff changeset
202 return CRYPT_OK;
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diff changeset
203 }
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diff changeset
204
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diff changeset
205 int rsa_import(const unsigned char *in, unsigned long inlen, rsa_key *key)
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diff changeset
206 {
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diff changeset
207 unsigned long x, y;
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diff changeset
208 int err;
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209
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diff changeset
210 _ARGCHK(in != NULL);
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diff changeset
211 _ARGCHK(key != NULL);
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diff changeset
212
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diff changeset
213 /* check length */
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diff changeset
214 if (inlen < (1+PACKET_SIZE)) {
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215 return CRYPT_INVALID_PACKET;
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diff changeset
216 }
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diff changeset
217
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diff changeset
218 /* test packet header */
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diff changeset
219 if ((err = packet_valid_header((unsigned char *)in, PACKET_SECT_RSA, PACKET_SUB_KEY)) != CRYPT_OK) {
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diff changeset
220 return err;
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diff changeset
221 }
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diff changeset
222
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diff changeset
223 /* init key */
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diff changeset
224 if ((err = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ, &key->dP, &key->qP,
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diff changeset
225 &key->pQ, &key->p, &key->q, NULL)) != MP_OKAY) {
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diff changeset
226 return mpi_to_ltc_error(err);
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diff changeset
227 }
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diff changeset
228
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diff changeset
229 /* get key type */
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diff changeset
230 y = PACKET_SIZE;
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diff changeset
231 key->type = (int)in[y++];
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diff changeset
232
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diff changeset
233 /* load the modulus */
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diff changeset
234 INPUT_BIGNUM(&key->N, in, x, y, inlen);
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diff changeset
235
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diff changeset
236 /* load public exponent */
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diff changeset
237 INPUT_BIGNUM(&key->e, in, x, y, inlen);
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diff changeset
238
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diff changeset
239 /* get private exponent */
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diff changeset
240 if (key->type == PK_PRIVATE || key->type == PK_PRIVATE_OPTIMIZED) {
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diff changeset
241 INPUT_BIGNUM(&key->d, in, x, y, inlen);
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diff changeset
242 }
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parents:
diff changeset
243
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diff changeset
244 /* get CRT private data if required */
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diff changeset
245 if (key->type == PK_PRIVATE_OPTIMIZED) {
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parents:
diff changeset
246 INPUT_BIGNUM(&key->dQ, in, x, y, inlen);
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diff changeset
247 INPUT_BIGNUM(&key->dP, in, x, y, inlen);
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diff changeset
248 INPUT_BIGNUM(&key->pQ, in, x, y, inlen);
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diff changeset
249 INPUT_BIGNUM(&key->qP, in, x, y, inlen);
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diff changeset
250 INPUT_BIGNUM(&key->p, in, x, y, inlen);
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diff changeset
251 INPUT_BIGNUM(&key->q, in, x, y, inlen);
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diff changeset
252 }
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diff changeset
253
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parents:
diff changeset
254 /* free up ram not required */
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parents:
diff changeset
255 if (key->type != PK_PRIVATE_OPTIMIZED) {
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parents:
diff changeset
256 mp_clear_multi(&key->dQ, &key->dP, &key->pQ, &key->qP, &key->p, &key->q, NULL);
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diff changeset
257 }
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diff changeset
258 if (key->type != PK_PRIVATE && key->type != PK_PRIVATE_OPTIMIZED) {
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parents:
diff changeset
259 mp_clear(&key->d);
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parents:
diff changeset
260 }
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diff changeset
261
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diff changeset
262 return CRYPT_OK;
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diff changeset
263 error:
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diff changeset
264 mp_clear_multi(&key->d, &key->e, &key->N, &key->dQ, &key->dP,
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parents:
diff changeset
265 &key->pQ, &key->qP, &key->p, &key->q, NULL);
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parents:
diff changeset
266 return err;
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parents:
diff changeset
267 }
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diff changeset
268
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parents:
diff changeset
269 #include "rsa_sys.c"
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diff changeset
270
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diff changeset
271 #endif /* RSA */
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272
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diff changeset
273