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annotate libtomcrypt/src/pk/rsa/rsa_import_x509.c @ 1712:d885a77b98e0

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avoid zero length array in base64_decode
author Matt Johnston <matt@ucc.asn.au>
date Wed, 10 Jun 2020 23:26:05 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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 an RSA key from a X.509 certificate, Steffen Jaeckel
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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 RSA key from a X.509 certificate
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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_x509(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 unsigned char *tmpbuf;
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29 unsigned long tmpbuf_len, tmp_inlen;
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30 ltc_asn1_list *decoded_list = NULL, *l;
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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 tmpbuf_len = inlen;
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43 tmpbuf = XCALLOC(1, tmpbuf_len);
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44 if (tmpbuf == NULL) {
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45 err = CRYPT_MEM;
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46 goto LBL_ERR;
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47 }
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48
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49 tmp_inlen = inlen;
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50 if ((err = der_decode_sequence_flexi(in, &tmp_inlen, &decoded_list)) == CRYPT_OK) {
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51 l = decoded_list;
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52 /* Move 2 levels up in the tree
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53 SEQUENCE
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54 SEQUENCE
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55 ...
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56 */
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57 if (l->type == LTC_ASN1_SEQUENCE && l->child) {
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58 l = l->child;
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59 if (l->type == LTC_ASN1_SEQUENCE && l->child) {
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60 l = l->child;
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61
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62 err = CRYPT_ERROR;
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63
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64 /* Move forward in the tree until we find this combination
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65 ...
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66 SEQUENCE
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67 SEQUENCE
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68 OBJECT IDENTIFIER 1.2.840.113549.1.1.1
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69 NULL
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70 BIT STRING
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71 */
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72 do {
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73 /* The additional check for l->data is there to make sure
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74 * we won't try to decode a list that has been 'shrunk'
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75 */
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76 if (l->type == LTC_ASN1_SEQUENCE && l->data && l->child &&
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77 l->child->type == LTC_ASN1_SEQUENCE && l->child->child &&
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78 l->child->child->type == LTC_ASN1_OBJECT_IDENTIFIER && l->child->next &&
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79 l->child->next->type == LTC_ASN1_BIT_STRING) {
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80 err = der_decode_subject_public_key_info(l->data, l->size,
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81 PKA_RSA, tmpbuf, &tmpbuf_len,
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82 LTC_ASN1_NULL, NULL, 0);
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83 if (err == CRYPT_OK) {
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84 /* now it should be SEQUENCE { INTEGER, INTEGER } */
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85 if ((err = der_decode_sequence_multi(tmpbuf, tmpbuf_len,
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86 LTC_ASN1_INTEGER, 1UL, key->N,
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87 LTC_ASN1_INTEGER, 1UL, key->e,
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88 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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89 goto LBL_ERR;
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90 }
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91 key->type = PK_PUBLIC;
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92 err = CRYPT_OK;
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93 goto LBL_FREE;
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94 }
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95 }
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96 l = l->next;
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97 } while(l);
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98 }
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99 }
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100 }
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101
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102
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103 LBL_ERR:
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104 rsa_free(key);
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105
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106 LBL_FREE:
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107 if (decoded_list) der_free_sequence_flexi(decoded_list);
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108 if (tmpbuf != NULL) XFREE(tmpbuf);
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109
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110 return err;
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111 }
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112
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113 #endif /* LTC_MRSA */
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114
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115
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116 /* ref: $Format:%D$ */
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117 /* git commit: $Format:%H$ */
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118 /* commit time: $Format:%ai$ */