Mercurial > dropbear
annotate libtomcrypt/src/pk/dsa/dsa_export.c @ 1938:77bc00dcc19f default tip main master
Bump version to 2022.82
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 01 Apr 2022 14:43:27 +0800 |
parents | e9dba7abd939 |
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rev | line source |
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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 #include "tomcrypt.h" |
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10 |
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11 /** |
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12 @file dsa_export.c |
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13 DSA implementation, export key, Tom St Denis |
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14 */ |
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15 |
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16 #ifdef LTC_MDSA |
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17 |
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18 /** |
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19 Export a DSA key to a binary packet |
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20 @param out [out] Where to store the packet |
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21 @param outlen [in/out] The max size and resulting size of the packet |
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22 @param type The type of key to export (PK_PRIVATE or PK_PUBLIC) |
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23 @param key The key to export |
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24 @return CRYPT_OK if successful |
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25 */ |
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26 int dsa_export(unsigned char *out, unsigned long *outlen, int type, dsa_key *key) |
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27 { |
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28 unsigned long zero=0; |
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29 int err, std; |
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30 |
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31 LTC_ARGCHK(out != NULL); |
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32 LTC_ARGCHK(outlen != NULL); |
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33 LTC_ARGCHK(key != NULL); |
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34 |
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35 std = type & PK_STD; |
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36 type &= ~PK_STD; |
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37 |
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38 /* can we store the static header? */ |
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39 if (type == PK_PRIVATE && key->type != PK_PRIVATE) { |
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40 return CRYPT_PK_TYPE_MISMATCH; |
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41 } |
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42 |
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43 if (type != PK_PUBLIC && type != PK_PRIVATE) { |
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44 return CRYPT_INVALID_ARG; |
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45 } |
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46 |
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47 if (type == PK_PRIVATE) { |
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48 if (std) { |
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49 return der_encode_sequence_multi(out, outlen, |
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50 LTC_ASN1_SHORT_INTEGER, 1UL, &zero, |
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51 LTC_ASN1_INTEGER, 1UL, key->p, |
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52 LTC_ASN1_INTEGER, 1UL, key->q, |
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53 LTC_ASN1_INTEGER, 1UL, key->g, |
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54 LTC_ASN1_INTEGER, 1UL, key->y, |
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55 LTC_ASN1_INTEGER, 1UL, key->x, |
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56 LTC_ASN1_EOL, 0UL, NULL); |
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57 } |
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58 else { |
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59 unsigned char flags[1]; |
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60 flags[0] = 1; |
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61 return der_encode_sequence_multi(out, outlen, |
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62 LTC_ASN1_BIT_STRING, 1UL, flags, |
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63 LTC_ASN1_INTEGER, 1UL, key->g, |
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64 LTC_ASN1_INTEGER, 1UL, key->p, |
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65 LTC_ASN1_INTEGER, 1UL, key->q, |
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66 LTC_ASN1_INTEGER, 1UL, key->y, |
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67 LTC_ASN1_INTEGER, 1UL, key->x, |
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68 LTC_ASN1_EOL, 0UL, NULL); |
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69 } |
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70 } else { |
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71 if (std) { |
1711 | 72 unsigned long tmplen = (unsigned long)(mp_count_bits(key->y) / 8) + 8; |
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73 unsigned char* tmp = XMALLOC(tmplen); |
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74 ltc_asn1_list int_list[3]; |
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75 |
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76 if (tmp == NULL) { |
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77 return CRYPT_MEM; |
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78 } |
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79 |
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80 err = der_encode_integer(key->y, tmp, &tmplen); |
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81 if (err != CRYPT_OK) { |
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82 goto error; |
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83 } |
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84 |
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85 LTC_SET_ASN1(int_list, 0, LTC_ASN1_INTEGER, key->p, 1UL); |
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86 LTC_SET_ASN1(int_list, 1, LTC_ASN1_INTEGER, key->q, 1UL); |
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87 LTC_SET_ASN1(int_list, 2, LTC_ASN1_INTEGER, key->g, 1UL); |
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88 |
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89 err = der_encode_subject_public_key_info(out, outlen, PKA_DSA, tmp, |
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90 tmplen, LTC_ASN1_SEQUENCE, int_list, |
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91 sizeof(int_list) / sizeof(int_list[0])); |
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92 |
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93 error: |
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94 XFREE(tmp); |
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95 return err; |
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96 } |
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97 else { |
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98 unsigned char flags[1]; |
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99 flags[0] = 0; |
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100 return der_encode_sequence_multi(out, outlen, |
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101 LTC_ASN1_BIT_STRING, 1UL, flags, |
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102 LTC_ASN1_INTEGER, 1UL, key->g, |
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103 LTC_ASN1_INTEGER, 1UL, key->p, |
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104 LTC_ASN1_INTEGER, 1UL, key->q, |
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105 LTC_ASN1_INTEGER, 1UL, key->y, |
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106 LTC_ASN1_EOL, 0UL, NULL); |
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107 } |
285
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108 } |
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109 } |
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110 |
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111 #endif |
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112 |
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113 |
1471
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114 /* ref: $Format:%D$ */ |
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115 /* git commit: $Format:%H$ */ |
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116 /* commit time: $Format:%ai$ */ |