Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/integer/der_decode_integer.c @ 1612:470aa609c7e4

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author Matt Johnston <matt@ucc.asn.au>
date Tue, 24 Jul 2018 20:19:05 +0800
parents 6dba84798cd5
children
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rev   line source
285
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diff changeset
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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15
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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 */
382
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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) {
285
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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;
1471
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
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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: $Format:%ai$ */