Mercurial > dropbear
annotate libtomcrypt/src/pk/rsa/rsa_import.c @ 1625:79eef94ccea9
Split ChanType closehandler() and cleanup() so that dbclient doesn't
lose exit status messages
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 14 Nov 2018 22:57:56 +0800 |
parents | 6dba84798cd5 |
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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 rsa_import.c |
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13 Import a PKCS RSA key, Tom St Denis |
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14 */ |
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15 |
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16 #ifdef LTC_MRSA |
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17 |
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18 /** |
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19 Import an RSAPublicKey or RSAPrivateKey [two-prime only, only support >= 1024-bit keys, defined in PKCS #1 v2.1] |
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20 @param in The packet to import from |
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21 @param inlen It's length (octets) |
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22 @param key [out] Destination for newly imported key |
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23 @return CRYPT_OK if successful, upon error allocated memory is freed |
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24 */ |
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25 int rsa_import(const unsigned char *in, unsigned long inlen, rsa_key *key) |
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26 { |
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27 int err; |
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28 void *zero; |
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29 unsigned char *tmpbuf=NULL; |
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30 unsigned long tmpbuf_len; |
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31 |
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32 LTC_ARGCHK(in != NULL); |
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33 LTC_ARGCHK(key != NULL); |
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34 LTC_ARGCHK(ltc_mp.name != NULL); |
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35 |
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36 /* init key */ |
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37 if ((err = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ, |
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38 &key->dP, &key->qP, &key->p, &key->q, NULL)) != CRYPT_OK) { |
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39 return err; |
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40 } |
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41 |
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42 /* see if the OpenSSL DER format RSA public key will work */ |
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43 tmpbuf_len = inlen; |
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44 tmpbuf = XCALLOC(1, tmpbuf_len); |
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45 if (tmpbuf == NULL) { |
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46 err = CRYPT_MEM; |
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47 goto LBL_ERR; |
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48 } |
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49 |
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50 err = der_decode_subject_public_key_info(in, inlen, |
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51 PKA_RSA, tmpbuf, &tmpbuf_len, |
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52 LTC_ASN1_NULL, NULL, 0); |
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53 |
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54 if (err == CRYPT_OK) { /* SubjectPublicKeyInfo format */ |
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55 |
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56 /* now it should be SEQUENCE { INTEGER, INTEGER } */ |
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57 if ((err = der_decode_sequence_multi(tmpbuf, tmpbuf_len, |
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58 LTC_ASN1_INTEGER, 1UL, key->N, |
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59 LTC_ASN1_INTEGER, 1UL, key->e, |
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60 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { |
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61 goto LBL_ERR; |
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62 } |
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63 key->type = PK_PUBLIC; |
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64 err = CRYPT_OK; |
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65 goto LBL_FREE; |
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66 } |
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67 |
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68 /* not SSL public key, try to match against PKCS #1 standards */ |
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69 err = der_decode_sequence_multi(in, inlen, LTC_ASN1_INTEGER, 1UL, key->N, |
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70 LTC_ASN1_EOL, 0UL, NULL); |
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71 |
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72 if (err != CRYPT_OK && err != CRYPT_INPUT_TOO_LONG) { |
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73 goto LBL_ERR; |
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74 } |
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75 |
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76 if (mp_cmp_d(key->N, 0) == LTC_MP_EQ) { |
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77 if ((err = mp_init(&zero)) != CRYPT_OK) { |
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78 goto LBL_ERR; |
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79 } |
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80 /* it's a private key */ |
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81 if ((err = der_decode_sequence_multi(in, inlen, |
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82 LTC_ASN1_INTEGER, 1UL, zero, |
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83 LTC_ASN1_INTEGER, 1UL, key->N, |
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84 LTC_ASN1_INTEGER, 1UL, key->e, |
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85 LTC_ASN1_INTEGER, 1UL, key->d, |
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86 LTC_ASN1_INTEGER, 1UL, key->p, |
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87 LTC_ASN1_INTEGER, 1UL, key->q, |
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88 LTC_ASN1_INTEGER, 1UL, key->dP, |
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89 LTC_ASN1_INTEGER, 1UL, key->dQ, |
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90 LTC_ASN1_INTEGER, 1UL, key->qP, |
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91 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { |
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92 mp_clear(zero); |
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93 goto LBL_ERR; |
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94 } |
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95 mp_clear(zero); |
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96 key->type = PK_PRIVATE; |
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97 } else if (mp_cmp_d(key->N, 1) == LTC_MP_EQ) { |
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98 /* we don't support multi-prime RSA */ |
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99 err = CRYPT_PK_INVALID_TYPE; |
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100 goto LBL_ERR; |
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101 } else { |
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102 /* it's a public key and we lack e */ |
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103 if ((err = der_decode_sequence_multi(in, inlen, |
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104 LTC_ASN1_INTEGER, 1UL, key->N, |
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105 LTC_ASN1_INTEGER, 1UL, key->e, |
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106 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { |
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107 goto LBL_ERR; |
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108 } |
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109 key->type = PK_PUBLIC; |
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110 } |
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111 err = CRYPT_OK; |
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112 goto LBL_FREE; |
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113 |
285
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114 LBL_ERR: |
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115 mp_clear_multi(key->d, key->e, key->N, key->dQ, key->dP, key->qP, key->p, key->q, NULL); |
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116 |
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117 LBL_FREE: |
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118 if (tmpbuf != NULL) |
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119 XFREE(tmpbuf); |
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120 |
285
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121 return err; |
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122 } |
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123 |
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124 #endif /* LTC_MRSA */ |
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125 |
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126 |
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127 /* ref: $Format:%D$ */ |
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128 /* git commit: $Format:%H$ */ |
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129 /* commit time: $Format:%ai$ */ |