Mercurial > dropbear
annotate libtomcrypt/src/pk/dsa/dsa_export.c @ 1902:4a6725ac957c
Revert "Don't include sk keys at all in KEX list"
This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72.
The sk algorithms need to remain in the sigalgs list so that they
are included in the server-sig-algs ext-info message sent by
the server. RFC8308 for server-sig-algs requires that all algorithms are
listed (though OpenSSH client 8.4p1 tested doesn't require that)
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 24 Mar 2022 13:42:08 +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: $Format:%ai$ */ |