Mercurial > dropbear

annotate rsa_sys.c @ 192:9cc34777b479 libtomcrypt

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propagate from branch 'au.asn.ucc.matt.ltc-orig' (head 9ba8f01f44320e9cb9f19881105ae84f84a43ea9) to branch 'au.asn.ucc.matt.dropbear.ltc' (head dbf51c569bc34956ad948e4cc87a0eeb2170b768)
author Matt Johnston <matt@ucc.asn.au>
date Sun, 08 May 2005 06:36:47 +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 /* these are smaller routines written by Clay Culver. They do the same function as the rsa_encrypt/decrypt
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13 * except that they are used to RSA encrypt/decrypt a single value and not a packet.
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14 */
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15 int rsa_encrypt_key(const unsigned char *inkey, unsigned long inlen,
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16 unsigned char *outkey, unsigned long *outlen,
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17 prng_state *prng, int wprng, rsa_key *key)
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18 {
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19 unsigned char rsa_in[RSA_STACK], rsa_out[RSA_STACK];
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20 unsigned long x, y, rsa_size;
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21 int err;
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22
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23 _ARGCHK(inkey != NULL);
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24 _ARGCHK(outkey != NULL);
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25 _ARGCHK(outlen != NULL);
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26 _ARGCHK(key != NULL);
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27
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28 /* only allow keys from 64 to 256 bits */
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29 if (inlen < 8 || inlen > 32) {
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30 return CRYPT_INVALID_ARG;
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31 }
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32
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33 /* are the parameters valid? */
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34 if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
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35 return err;
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36 }
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37
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38 /* rsa_pad the symmetric key */
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39 y = (unsigned long)sizeof(rsa_in);
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40 if ((err = rsa_pad(inkey, inlen, rsa_in, &y, wprng, prng)) != CRYPT_OK) {
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41 return CRYPT_ERROR;
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42 }
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43
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44 /* rsa encrypt it */
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45 rsa_size = (unsigned long)sizeof(rsa_out);
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46 if ((err = rsa_exptmod(rsa_in, y, rsa_out, &rsa_size, PK_PUBLIC, key)) != CRYPT_OK) {
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47 return CRYPT_ERROR;
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48 }
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49
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50 /* check size */
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51 if (*outlen < (PACKET_SIZE+4+rsa_size)) {
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52 return CRYPT_BUFFER_OVERFLOW;
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53 }
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54
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55 /* store header */
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56 packet_store_header(outkey, PACKET_SECT_RSA, PACKET_SUB_ENC_KEY);
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57
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58 /* now lets make the header */
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59 y = PACKET_SIZE;
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60
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61 /* store the size of the RSA value */
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62 STORE32L(rsa_size, (outkey+y));
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63 y += 4;
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64
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65 /* store the rsa value */
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66 for (x = 0; x < rsa_size; x++, y++) {
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67 outkey[y] = rsa_out[x];
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68 }
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69
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70 *outlen = y;
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71 #ifdef CLEAN_STACK
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72 /* clean up */
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73 zeromem(rsa_in, sizeof(rsa_in));
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74 zeromem(rsa_out, sizeof(rsa_out));
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75 #endif
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76
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77 return CRYPT_OK;
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78 }
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79
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80 int rsa_decrypt_key(const unsigned char *in, unsigned long inlen,
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81 unsigned char *outkey, unsigned long *keylen,
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82 rsa_key *key)
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83 {
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84 unsigned char sym_key[MAXBLOCKSIZE], rsa_out[RSA_STACK];
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85 unsigned long x, y, z, i, rsa_size;
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86 int err;
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87
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88 _ARGCHK(in != NULL);
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89 _ARGCHK(outkey != NULL);
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90 _ARGCHK(keylen != NULL);
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91 _ARGCHK(key != NULL);
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92
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93 /* right key type? */
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94 if (key->type != PK_PRIVATE && key->type != PK_PRIVATE_OPTIMIZED) {
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95 return CRYPT_PK_NOT_PRIVATE;
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96 }
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97
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98 if (inlen < PACKET_SIZE+4) {
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99 return CRYPT_INVALID_PACKET;
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100 } else {
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101 inlen -= PACKET_SIZE+4;
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102 }
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103
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104 /* check the header */
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105 if ((err = packet_valid_header((unsigned char *)in, PACKET_SECT_RSA, PACKET_SUB_ENC_KEY)) != CRYPT_OK) {
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106 return err;
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107 }
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108
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109 /* grab length of the rsa key */
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110 y = PACKET_SIZE;
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111 LOAD32L(rsa_size, (in+y));
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112 if (inlen < rsa_size) {
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113 return CRYPT_INVALID_PACKET;
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114 } else {
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115 inlen -= rsa_size;
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116 }
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117 y += 4;
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118
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119 /* decrypt it */
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120 x = (unsigned long)sizeof(rsa_out);
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121 if ((err = rsa_exptmod(in+y, rsa_size, rsa_out, &x, PK_PRIVATE, key)) != CRYPT_OK) {
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122 return err;
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123 }
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124 y += rsa_size;
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125
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126 /* depad it */
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127 z = (unsigned long)sizeof(sym_key);
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128 if ((err = rsa_depad(rsa_out, x, sym_key, &z)) != CRYPT_OK) {
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129 return err;
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130 }
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131
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132 /* check size */
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133 if (*keylen < z) {
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134 return CRYPT_BUFFER_OVERFLOW;
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parents:
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135 }
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parents:
diff changeset
136
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parents:
diff changeset
137 for (i = 0; i < z; i++) {
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diff changeset
138 outkey[i] = sym_key[i];
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parents:
diff changeset
139 }
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parents:
diff changeset
140
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parents:
diff changeset
141 #ifdef CLEAN_STACK
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parents:
diff changeset
142 /* clean up */
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parents:
diff changeset
143 zeromem(sym_key, sizeof(sym_key));
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parents:
diff changeset
144 zeromem(rsa_out, sizeof(rsa_out));
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parents:
diff changeset
145 #endif
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diff changeset
146 *keylen = z;
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parents:
diff changeset
147 return CRYPT_OK;
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parents:
diff changeset
148 }
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parents:
diff changeset
149
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diff changeset
150 int rsa_sign_hash(const unsigned char *in, unsigned long inlen,
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diff changeset
151 unsigned char *out, unsigned long *outlen,
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diff changeset
152 rsa_key *key)
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diff changeset
153 {
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diff changeset
154 unsigned long rsa_size, x, y;
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diff changeset
155 unsigned char rsa_in[RSA_STACK], rsa_out[RSA_STACK];
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parents:
diff changeset
156 int err;
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diff changeset
157
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diff changeset
158 _ARGCHK(in != NULL);
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diff changeset
159 _ARGCHK(out != NULL);
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diff changeset
160 _ARGCHK(outlen != NULL);
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diff changeset
161 _ARGCHK(key != NULL);
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diff changeset
162
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diff changeset
163 /* reject nonsense sizes */
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diff changeset
164 if (inlen > (512/3) || inlen < 16) {
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165 return CRYPT_INVALID_ARG;
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166 }
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diff changeset
167
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diff changeset
168 /* type of key? */
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diff changeset
169 if (key->type != PK_PRIVATE && key->type != PK_PRIVATE_OPTIMIZED) {
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diff changeset
170 return CRYPT_PK_NOT_PRIVATE;
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diff changeset
171 }
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diff changeset
172
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diff changeset
173 /* pad it */
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diff changeset
174 x = (unsigned long)sizeof(rsa_out);
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diff changeset
175 if ((err = rsa_signpad(in, inlen, rsa_out, &x)) != CRYPT_OK) {
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parents:
diff changeset
176 return err;
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parents:
diff changeset
177 }
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diff changeset
178
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diff changeset
179 /* sign it */
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diff changeset
180 rsa_size = (unsigned long)sizeof(rsa_in);
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diff changeset
181 if ((err = rsa_exptmod(rsa_out, x, rsa_in, &rsa_size, PK_PRIVATE, key)) != CRYPT_OK) {
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parents:
diff changeset
182 return err;
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parents:
diff changeset
183 }
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parents:
diff changeset
184
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
185 /* check size */
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parents:
diff changeset
186 if (*outlen < (PACKET_SIZE+4+rsa_size)) {
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parents:
diff changeset
187 return CRYPT_BUFFER_OVERFLOW;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
188 }
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diff changeset
189
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
190 /* now lets output the message */
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diff changeset
191 y = PACKET_SIZE;
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diff changeset
192
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diff changeset
193 /* output the len */
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diff changeset
194 STORE32L(rsa_size, (out+y));
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diff changeset
195 y += 4;
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diff changeset
196
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diff changeset
197 /* store the signature */
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diff changeset
198 for (x = 0; x < rsa_size; x++, y++) {
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diff changeset
199 out[y] = rsa_in[x];
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diff changeset
200 }
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diff changeset
201
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diff changeset
202 /* store header */
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parents:
diff changeset
203 packet_store_header(out, PACKET_SECT_RSA, PACKET_SUB_SIGNED);
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diff changeset
204
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diff changeset
205 #ifdef CLEAN_STACK
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diff changeset
206 /* clean up */
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diff changeset
207 zeromem(rsa_in, sizeof(rsa_in));
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diff changeset
208 zeromem(rsa_out, sizeof(rsa_out));
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parents:
diff changeset
209 #endif
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diff changeset
210 *outlen = y;
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diff changeset
211 return CRYPT_OK;
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parents:
diff changeset
212 }
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diff changeset
213
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diff changeset
214 int rsa_verify_hash(const unsigned char *sig, unsigned long siglen,
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parents:
diff changeset
215 const unsigned char *md, int *stat, rsa_key *key)
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parents:
diff changeset
216 {
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diff changeset
217 unsigned long rsa_size, x, y, z;
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parents:
diff changeset
218 unsigned char rsa_in[RSA_STACK], rsa_out[RSA_STACK];
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parents:
diff changeset
219 int err;
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diff changeset
220
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diff changeset
221 _ARGCHK(sig != NULL);
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diff changeset
222 _ARGCHK(md != NULL);
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diff changeset
223 _ARGCHK(stat != NULL);
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diff changeset
224 _ARGCHK(key != NULL);
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parents:
diff changeset
225
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diff changeset
226 /* always be incorrect by default */
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parents:
diff changeset
227 *stat = 0;
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diff changeset
228
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diff changeset
229 if (siglen < PACKET_SIZE+4) {
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parents:
diff changeset
230 return CRYPT_INVALID_PACKET;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
231 } else {
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
232 siglen -= PACKET_SIZE+4;
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diff changeset
233 }
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diff changeset
234
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
235 /* verify header */
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parents:
diff changeset
236 if ((err = packet_valid_header((unsigned char *)sig, PACKET_SECT_RSA, PACKET_SUB_SIGNED)) != CRYPT_OK) {
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parents:
diff changeset
237 return err;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
239
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
240 /* get the len */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
241 y = PACKET_SIZE;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242 LOAD32L(rsa_size, (sig+y));
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parents:
diff changeset
243 if (siglen < rsa_size) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244 return CRYPT_INVALID_PACKET;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
245 } else {
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
246 siglen -= rsa_size;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
247 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
248 y += 4;
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parents:
diff changeset
249
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
250 /* exptmod it */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
251 x = (unsigned long)sizeof(rsa_out);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
252 if ((err = rsa_exptmod(sig+y, rsa_size, rsa_out, &x, PK_PUBLIC, key)) != CRYPT_OK) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
253 return err;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
254 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255 y += rsa_size;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
256
d7da3b1e1540 put back the 0.95 makefile which was inadvertently merged over
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
257 /* depad it */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
258 z = (unsigned long)sizeof(rsa_in);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
259 if ((err = rsa_signdepad(rsa_out, x, rsa_in, &z)) != CRYPT_OK) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
260 return err;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
261 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
262
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
263 /* check? */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
264 if (memcmp(rsa_in, md, (size_t)z) == 0) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
265 *stat = 1;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
266 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
267
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
268 #ifdef CLEAN_STACK
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parents:
diff changeset
269 zeromem(rsa_in, sizeof(rsa_in));
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
270 zeromem(rsa_out, sizeof(rsa_out));
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
271 #endif
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
272 return CRYPT_OK;
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Matt Johnston <matt@ucc.asn.au>
parents:
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273 }
d7da3b1e1540 put back the 0.95 makefile which was inadvertently merged over
Matt Johnston <matt@ucc.asn.au>
parents:
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