Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/integer/der_decode_integer.c @ 1902:4a6725ac957c

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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>
date Thu, 24 Mar 2022 13:42:08 +0800
parents 6dba84798cd5
children
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285
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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 der_decode_integer.c
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13 ASN.1 DER, decode an integer, Tom St Denis
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14 */
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16
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17 #ifdef LTC_DER
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18
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19 /**
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20 Read a mp_int integer
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21 @param in The DER encoded data
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22 @param inlen Size of DER encoded data
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23 @param num The first mp_int to decode
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24 @return CRYPT_OK if successful
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25 */
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26 int der_decode_integer(const unsigned char *in, unsigned long inlen, void *num)
285
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27 {
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28 unsigned long x, y, z;
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29 int err;
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30
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31 LTC_ARGCHK(num != NULL);
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32 LTC_ARGCHK(in != NULL);
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33
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34 /* min DER INTEGER is 0x02 01 00 == 0 */
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35 if (inlen < (1 + 1 + 1)) {
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36 return CRYPT_INVALID_PACKET;
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37 }
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38
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39 /* ok expect 0x02 when we AND with 0001 1111 [1F] */
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40 x = 0;
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41 if ((in[x++] & 0x1F) != 0x02) {
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42 return CRYPT_INVALID_PACKET;
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43 }
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44
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45 /* now decode the len stuff */
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46 z = in[x++];
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47
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48 if ((z & 0x80) == 0x00) {
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49 /* short form */
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50
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51 /* will it overflow? */
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52 if (x + z > inlen) {
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53 return CRYPT_INVALID_PACKET;
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54 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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55
285
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56 /* no so read it */
382
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57 if ((err = mp_read_unsigned_bin(num, (unsigned char *)in + x, z)) != CRYPT_OK) {
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58 return err;
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59 }
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60 } else {
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61 /* long form */
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62 z &= 0x7F;
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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63
285
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64 /* will number of length bytes overflow? (or > 4) */
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65 if (((x + z) > inlen) || (z > 4) || (z == 0)) {
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66 return CRYPT_INVALID_PACKET;
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67 }
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68
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69 /* now read it in */
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70 y = 0;
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71 while (z--) {
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72 y = ((unsigned long)(in[x++])) | (y << 8);
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73 }
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74
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75 /* now will reading y bytes overrun? */
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76 if ((x + y) > inlen) {
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77 return CRYPT_INVALID_PACKET;
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78 }
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79
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80 /* no so read it */
382
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81 if ((err = mp_read_unsigned_bin(num, (unsigned char *)in + x, y)) != CRYPT_OK) {
285
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82 return err;
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83 }
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84 }
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85
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86 /* see if it's negative */
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87 if (in[x] & 0x80) {
382
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88 void *tmp;
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89 if (mp_init(&tmp) != CRYPT_OK) {
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 return CRYPT_MEM;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
93 if (mp_2expt(tmp, mp_count_bits(num)) != CRYPT_OK || mp_sub(num, tmp, num) != CRYPT_OK) {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
94 mp_clear(tmp);
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 return CRYPT_MEM;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 }
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
97 mp_clear(tmp);
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
98 }
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100 return CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
104 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
105
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
106 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
107 /* 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
108 /* commit time: $Format:%ai$ */