Mercurial > dropbear

annotate libtomcrypt/src/pk/dsa/dsa_import.c @ 1593:c8c20fb57a9a

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Don't read uninitialised value. From https://github.com/libtom/libtommath/commit/1d03522625f46214733e8e143a4765c01fc146f9
author Matt Johnston <matt@ucc.asn.au>
date Mon, 05 Mar 2018 16:50:24 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
285
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diff changeset
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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diff changeset
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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diff changeset
9 #include "tomcrypt.h"
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10
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diff changeset
11 /**
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12 @file dsa_import.c
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13 DSA implementation, import a DSA key, Tom St Denis
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14 */
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15
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f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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16 #ifdef LTC_MDSA
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17
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18 /**
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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19 Import a DSA key
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20 @param in The binary packet to import from
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21 @param inlen The length of the binary packet
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22 @param key [out] Where to store the imported key
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23 @return CRYPT_OK if successful, upon error this function will free all allocated memory
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24 */
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25 int dsa_import(const unsigned char *in, unsigned long inlen, dsa_key *key)
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26 {
1471
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27 int err, stat;
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28 unsigned long zero = 0;
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29 unsigned char* tmpbuf = NULL;
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30 unsigned char flags[1];
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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 (mp_init_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL) != CRYPT_OK) {
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38 return CRYPT_MEM;
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39 }
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40
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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41 /* try to match the old libtomcrypt format */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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42 err = der_decode_sequence_multi(in, inlen, LTC_ASN1_BIT_STRING, 1UL, flags,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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43 LTC_ASN1_EOL, 0UL, NULL);
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44
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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45 if (err == CRYPT_OK || err == CRYPT_INPUT_TOO_LONG) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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46 /* private key */
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47 if (flags[0] == 1) {
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48 if ((err = der_decode_sequence_multi(in, inlen,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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49 LTC_ASN1_BIT_STRING, 1UL, flags,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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50 LTC_ASN1_INTEGER, 1UL, key->g,
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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->y,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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54 LTC_ASN1_INTEGER, 1UL, key->x,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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55 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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56 goto LBL_ERR;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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57 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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58 key->type = PK_PRIVATE;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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59 goto LBL_OK;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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60 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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61 /* public key */
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62 else if (flags[0] == 0) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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63 if ((err = der_decode_sequence_multi(in, inlen,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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64 LTC_ASN1_BIT_STRING, 1UL, flags,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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65 LTC_ASN1_INTEGER, 1UL, key->g,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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66 LTC_ASN1_INTEGER, 1UL, key->p,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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67 LTC_ASN1_INTEGER, 1UL, key->q,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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68 LTC_ASN1_INTEGER, 1UL, key->y,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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69 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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70 goto LBL_ERR;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
71 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
72 key->type = PK_PUBLIC;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
73 goto LBL_OK;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
74 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
75 else {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
76 err = CRYPT_INVALID_PACKET;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
77 goto LBL_ERR;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
78 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
79 }
285
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diff changeset
80 /* get key type */
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diff changeset
81 if ((err = der_decode_sequence_multi(in, inlen,
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
82 LTC_ASN1_SHORT_INTEGER, 1UL, &zero,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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83 LTC_ASN1_INTEGER, 1UL, key->p,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
84 LTC_ASN1_INTEGER, 1UL, key->q,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
85 LTC_ASN1_INTEGER, 1UL, key->g,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
86 LTC_ASN1_INTEGER, 1UL, key->y,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
87 LTC_ASN1_INTEGER, 1UL, key->x,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
88 LTC_ASN1_EOL, 0UL, NULL)) == CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
89
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
90 key->type = PK_PRIVATE;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
91 } else { /* public */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
92 ltc_asn1_list params[3];
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
93 unsigned long tmpbuf_len = inlen;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
94
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
95 LTC_SET_ASN1(params, 0, LTC_ASN1_INTEGER, key->p, 1UL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
96 LTC_SET_ASN1(params, 1, LTC_ASN1_INTEGER, key->q, 1UL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
97 LTC_SET_ASN1(params, 2, LTC_ASN1_INTEGER, key->g, 1UL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
98
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
99 tmpbuf = XCALLOC(1, tmpbuf_len);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
100 if (tmpbuf == NULL) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
101 err = CRYPT_MEM;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
102 goto LBL_ERR;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
103 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
104
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
105 err = der_decode_subject_public_key_info(in, inlen, PKA_DSA,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
106 tmpbuf, &tmpbuf_len,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
107 LTC_ASN1_SEQUENCE, params, 3);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
108 if (err != CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
109 XFREE(tmpbuf);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
110 goto LBL_ERR;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
111 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
112
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
113 if ((err=der_decode_integer(tmpbuf, tmpbuf_len, key->y)) != CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
114 XFREE(tmpbuf);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
115 goto LBL_ERR;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
116 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
117
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
118 XFREE(tmpbuf);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
119 key->type = PK_PUBLIC;
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
120 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
121
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
122 LBL_OK:
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
123 key->qord = mp_unsigned_bin_size(key->q);
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
124
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
125 /* quick p, q, g validation, without primality testing */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
126 if ((err = dsa_int_validate_pqg(key, &stat)) != CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
127 goto LBL_ERR;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
128 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
129 if (stat == 0) {
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
130 err = CRYPT_INVALID_PACKET;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
131 goto LBL_ERR;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
132 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
133 /* validate x, y */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
134 if ((err = dsa_int_validate_xy(key, &stat)) != CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
135 goto LBL_ERR;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
136 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
137 if (stat == 0) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
138 err = CRYPT_INVALID_PACKET;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
139 goto LBL_ERR;
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
140 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
141
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
142 return CRYPT_OK;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
143 LBL_ERR:
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
144 dsa_free(key);
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
145 return err;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
146 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
147
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
148 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
149
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
150 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
151 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
152 /* commit time: $Format:%ai$ */