Mercurial > dropbear
annotate ecc.c @ 768:6e6ce39da2fc ecc
A bit of debugging output
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 09 Apr 2013 22:47:03 +0800 |
parents | e465ed10c51d |
children | 70625eed40c9 |
rev | line source |
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756 | 1 #include "includes.h" |
2 #include "options.h" | |
3 #include "ecc.h" | |
759
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4 #include "dbutil.h" |
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5 #include "bignum.h" |
756 | 6 |
755
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7 #ifdef DROPBEAR_ECC |
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8 |
767
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9 // .dp members are filled out by dropbear_ecc_fill_dp() at startup |
756 | 10 #ifdef DROPBEAR_ECC_256 |
767
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11 struct dropbear_ecc_curve ecc_curve_nistp256 = { |
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12 .ltc_size = 32, |
766 | 13 .hashdesc = &sha256_desc, |
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14 .name = "nistp256" |
756 | 15 }; |
16 #endif | |
17 #ifdef DROPBEAR_ECC_384 | |
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18 struct dropbear_ecc_curve ecc_curve_nistp384 = { |
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19 .ltc_size = 48, |
766 | 20 .hashdesc = &sha384_desc, |
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21 .name = "nistp384" |
756 | 22 }; |
23 #endif | |
757 | 24 #ifdef DROPBEAR_ECC_521 |
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25 struct dropbear_ecc_curve ecc_curve_nistp521 = { |
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26 .ltc_size = 66, |
766 | 27 .hashdesc = &sha512_desc, |
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28 .name = "nistp521" |
756 | 29 }; |
30 #endif | |
31 | |
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32 struct dropbear_ecc_curve *dropbear_ecc_curves[] = { |
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33 #ifdef DROPBEAR_ECC_256 |
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34 &ecc_curve_nistp256, |
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35 #endif |
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36 #ifdef DROPBEAR_ECC_384 |
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37 &ecc_curve_nistp384, |
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38 #endif |
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39 #ifdef DROPBEAR_ECC_521 |
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40 &ecc_curve_nistp521, |
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41 #endif |
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42 NULL |
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43 }; |
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44 |
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45 void dropbear_ecc_fill_dp() { |
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46 struct dropbear_ecc_curve **curve; |
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47 // libtomcrypt guarantees they're ordered by size |
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48 const ltc_ecc_set_type *dp = ltc_ecc_sets; |
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49 for (curve = dropbear_ecc_curves; *curve; curve++) { |
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50 for (;dp->size > 0; dp++) { |
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51 if (dp->size == (*curve)->ltc_size) { |
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52 (*curve)->dp = dp; |
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53 break; |
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54 } |
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55 } |
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56 if (!(*curve)->dp) { |
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57 dropbear_exit("Missing ECC params %s", (*curve)->name); |
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58 } |
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59 } |
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60 } |
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61 |
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62 ecc_key * new_ecc_key(void) { |
765
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63 ecc_key *key = m_malloc(sizeof(*key)); |
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64 key->pubkey.x = m_malloc(sizeof(mp_int)); |
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65 key->pubkey.y = m_malloc(sizeof(mp_int)); |
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66 key->pubkey.z = m_malloc(sizeof(mp_int)); |
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67 key->k = m_malloc(sizeof(mp_int)); |
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68 m_mp_init_multi(key->pubkey.x, key->pubkey.y, key->pubkey.z, key->k, NULL); |
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69 return key; |
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70 } |
756 | 71 |
765
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72 // Copied from libtomcrypt ecc_import.c (version there is static), modified |
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73 // for different mp_int pointer without LTC_SOURCE |
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74 static int ecc_is_point(ecc_key *key) |
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75 { |
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76 mp_int *prime, *b, *t1, *t2; |
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77 int err; |
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78 |
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79 prime = m_malloc(sizeof(mp_int)); |
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80 b = m_malloc(sizeof(mp_int)); |
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81 t1 = m_malloc(sizeof(mp_int)); |
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82 t2 = m_malloc(sizeof(mp_int)); |
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83 |
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84 m_mp_init_multi(prime, b, t1, t2, NULL); |
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85 |
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86 /* load prime and b */ |
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87 if ((err = mp_read_radix(prime, key->dp->prime, 16)) != CRYPT_OK) { goto error; } |
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88 if ((err = mp_read_radix(b, key->dp->B, 16)) != CRYPT_OK) { goto error; } |
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89 |
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90 /* compute y^2 */ |
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91 if ((err = mp_sqr(key->pubkey.y, t1)) != CRYPT_OK) { goto error; } |
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92 |
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93 /* compute x^3 */ |
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94 if ((err = mp_sqr(key->pubkey.x, t2)) != CRYPT_OK) { goto error; } |
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95 if ((err = mp_mod(t2, prime, t2)) != CRYPT_OK) { goto error; } |
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96 if ((err = mp_mul(key->pubkey.x, t2, t2)) != CRYPT_OK) { goto error; } |
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97 |
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98 /* compute y^2 - x^3 */ |
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99 if ((err = mp_sub(t1, t2, t1)) != CRYPT_OK) { goto error; } |
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100 |
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101 /* compute y^2 - x^3 + 3x */ |
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102 if ((err = mp_add(t1, key->pubkey.x, t1)) != CRYPT_OK) { goto error; } |
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103 if ((err = mp_add(t1, key->pubkey.x, t1)) != CRYPT_OK) { goto error; } |
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104 if ((err = mp_add(t1, key->pubkey.x, t1)) != CRYPT_OK) { goto error; } |
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105 if ((err = mp_mod(t1, prime, t1)) != CRYPT_OK) { goto error; } |
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106 while (mp_cmp_d(t1, 0) == LTC_MP_LT) { |
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107 if ((err = mp_add(t1, prime, t1)) != CRYPT_OK) { goto error; } |
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108 } |
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109 while (mp_cmp(t1, prime) != LTC_MP_LT) { |
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110 if ((err = mp_sub(t1, prime, t1)) != CRYPT_OK) { goto error; } |
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111 } |
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112 |
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113 /* compare to b */ |
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114 if (mp_cmp(t1, b) != LTC_MP_EQ) { |
5503e05ab3a4
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115 err = CRYPT_INVALID_PACKET; |
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116 } else { |
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117 err = CRYPT_OK; |
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118 } |
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119 |
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120 error: |
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121 mp_clear_multi(prime, b, t1, t2, NULL); |
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122 m_free(prime); |
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123 m_free(b); |
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124 m_free(t1); |
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125 m_free(t2); |
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126 return err; |
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127 } |
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128 |
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129 /* For the "ephemeral public key octet string" in ECDH (rfc5656 section 4) */ |
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130 void buf_put_ecc_raw_pubkey_string(buffer *buf, ecc_key *key) { |
759
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More changes for KEX and ECDH. Set up hash descriptors, make ECC code work,
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131 unsigned long len = key->dp->size*2 + 1; |
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132 buf_putint(buf, len); |
755
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133 int err = ecc_ansi_x963_export(key, buf_getwriteptr(buf, len), &len); |
b07eb3dc23ec
refactor kexdh code a bit, start working on ecdh etc
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134 if (err != CRYPT_OK) { |
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refactor kexdh code a bit, start working on ecdh etc
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135 dropbear_exit("ECC error"); |
b07eb3dc23ec
refactor kexdh code a bit, start working on ecdh etc
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136 } |
b07eb3dc23ec
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137 buf_incrwritepos(buf, len); |
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refactor kexdh code a bit, start working on ecdh etc
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diff
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138 } |
b07eb3dc23ec
refactor kexdh code a bit, start working on ecdh etc
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139 |
765
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140 /* For the "ephemeral public key octet string" in ECDH (rfc5656 section 4) */ |
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141 ecc_key * buf_get_ecc_raw_pubkey(buffer *buf, const struct dropbear_ecc_curve *curve) { |
5503e05ab3a4
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142 ecc_key *key = NULL; |
5503e05ab3a4
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143 int ret = DROPBEAR_FAILURE; |
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144 const unsigned int size = curve->dp->size; |
768 | 145 unsigned char first; |
146 | |
147 TRACE(("enter buf_get_ecc_raw_pubkey")) | |
148 | |
765
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149 buf_setpos(buf, 0); |
768 | 150 first = buf_getbyte(buf); |
765
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151 if (first == 2 || first == 3) { |
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152 dropbear_log(LOG_WARNING, "Dropbear doesn't support ECC point compression"); |
5503e05ab3a4
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153 return NULL; |
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154 } |
768 | 155 if (first != 4 || buf->len != 1+2*size) { |
156 TRACE(("leave, wrong size")) | |
765
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157 return NULL; |
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158 } |
759
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159 |
765
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160 key = new_ecc_key(); |
5503e05ab3a4
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161 key->dp = curve->dp; |
5503e05ab3a4
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162 |
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163 if (mp_read_unsigned_bin(key->pubkey.x, buf_getptr(buf, size), size) != MP_OKAY) { |
768 | 164 TRACE(("failed to read x")) |
765
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165 goto out; |
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166 } |
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167 buf_incrpos(buf, size); |
759
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More changes for KEX and ECDH. Set up hash descriptors, make ECC code work,
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168 |
765
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169 if (mp_read_unsigned_bin(key->pubkey.y, buf_getptr(buf, size), size) != MP_OKAY) { |
768 | 170 TRACE(("failed to read y")) |
765
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171 goto out; |
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172 } |
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173 buf_incrpos(buf, size); |
757 | 174 |
765
5503e05ab3a4
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175 mp_set(key->pubkey.z, 1); |
757 | 176 |
765
5503e05ab3a4
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177 if (ecc_is_point(key) != CRYPT_OK) { |
768 | 178 TRACE(("failed, not a point")) |
765
5503e05ab3a4
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179 goto out; |
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180 } |
757 | 181 |
182 // SEC1 3.2.3.1 Check that Q != 0 | |
765
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183 if (mp_cmp_d(key->pubkey.x, 0) == LTC_MP_EQ) { |
768 | 184 TRACE(("failed, x == 0")) |
765
5503e05ab3a4
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185 goto out; |
5503e05ab3a4
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186 } |
5503e05ab3a4
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187 if (mp_cmp_d(key->pubkey.y, 0) == LTC_MP_EQ) { |
768 | 188 TRACE(("failed, y == 0")) |
765
5503e05ab3a4
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189 goto out; |
5503e05ab3a4
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190 } |
757 | 191 |
765
5503e05ab3a4
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diff
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192 ret = DROPBEAR_SUCCESS; |
757 | 193 |
765
5503e05ab3a4
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194 out: |
5503e05ab3a4
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195 if (ret == DROPBEAR_FAILURE) { |
5503e05ab3a4
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196 if (key) { |
5503e05ab3a4
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diff
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197 ecc_free(key); |
5503e05ab3a4
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198 m_free(key); |
5503e05ab3a4
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199 key = NULL; |
5503e05ab3a4
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200 } |
5503e05ab3a4
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diff
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|
201 } |
757 | 202 |
765
5503e05ab3a4
- Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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diff
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203 return key; |
757 | 204 |
755
b07eb3dc23ec
refactor kexdh code a bit, start working on ecdh etc
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diff
changeset
|
205 } |
b07eb3dc23ec
refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
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206 |
756 | 207 // a modified version of libtomcrypt's "ecc_shared_secret" to output |
208 // a mp_int instead. | |
209 mp_int * dropbear_ecc_shared_secret(ecc_key *public_key, ecc_key *private_key) | |
210 { | |
765
5503e05ab3a4
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diff
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211 ecc_point *result = NULL; |
5503e05ab3a4
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212 mp_int *prime = NULL, *shared_secret = NULL; |
5503e05ab3a4
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213 int err = DROPBEAR_FAILURE; |
756 | 214 |
215 /* type valid? */ | |
765
5503e05ab3a4
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216 if (private_key->type != PK_PRIVATE) { |
5503e05ab3a4
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217 goto done; |
5503e05ab3a4
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218 } |
756 | 219 |
765
5503e05ab3a4
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220 if (private_key->dp != public_key->dp) { |
5503e05ab3a4
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221 goto done; |
5503e05ab3a4
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222 } |
756 | 223 |
224 /* make new point */ | |
765
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225 result = ltc_ecc_new_point(); |
5503e05ab3a4
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226 if (result == NULL) { |
5503e05ab3a4
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227 goto done; |
5503e05ab3a4
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diff
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228 } |
756 | 229 |
765
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diff
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230 prime = m_malloc(sizeof(*prime)); |
5503e05ab3a4
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diff
changeset
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231 m_mp_init(prime); |
756 | 232 |
765
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233 if (mp_read_radix(prime, (char *)private_key->dp->prime, 16) != CRYPT_OK) { |
5503e05ab3a4
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234 goto done; |
5503e05ab3a4
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Matt Johnston <matt@ucc.asn.au>
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763
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235 } |
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236 if (ltc_mp.ecc_ptmul(private_key->k, &public_key->pubkey, result, prime, 1) != CRYPT_OK) { |
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237 goto done; |
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238 } |
756 | 239 |
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240 err = DROPBEAR_SUCCESS; |
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241 done: |
756 | 242 if (err == DROPBEAR_SUCCESS) { |
763 | 243 shared_secret = m_malloc(sizeof(*shared_secret)); |
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244 m_mp_init(shared_secret); |
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245 mp_copy(result->x, shared_secret); |
756 | 246 } |
247 | |
248 if (prime) { | |
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249 mp_clear(prime); |
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250 m_free(prime); |
756 | 251 } |
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252 if (result) |
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253 { |
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254 ltc_ecc_del_point(result); |
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255 } |
756 | 256 |
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257 if (err == DROPBEAR_FAILURE) { |
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258 dropbear_exit("ECC error"); |
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259 } |
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260 return shared_secret; |
756 | 261 } |
755
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262 |
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263 #endif |