Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/object_identifier/der_decode_object_identifier.c @ 404:a588558bfc94

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Fix potential null pointer dereference found by Klokwork
author Matt Johnston <matt@ucc.asn.au>
date Sat, 03 Feb 2007 09:58:14 +0000
parents 1b9e69c058d2
children 0cbe8f6dbf9e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 * Tom St Denis, [email protected], http://libtomcrypt.org
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file der_decode_object_identifier.c
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15 ASN.1 DER, Decode Object Identifier, Tom St Denis
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16 */
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17
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18 #ifdef LTC_DER
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19 /**
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20 Decode OID data and store the array of integers in words
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21 @param in The OID DER encoded data
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22 @param inlen The length of the OID data
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23 @param words [out] The destination of the OID words
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24 @param outlen [in/out] The number of OID words
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25 @return CRYPT_OK if successful
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26 */
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27 int der_decode_object_identifier(const unsigned char *in, unsigned long inlen,
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28 unsigned long *words, unsigned long *outlen)
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29 {
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30 unsigned long x, y, t, len;
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31
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32 LTC_ARGCHK(in != NULL);
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33 LTC_ARGCHK(words != NULL);
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34 LTC_ARGCHK(outlen != NULL);
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35
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36 /* header is at least 3 bytes */
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37 if (inlen < 3) {
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38 return CRYPT_INVALID_PACKET;
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39 }
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40
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41 /* must be room for at least two words */
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42 if (*outlen < 2) {
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43 return CRYPT_BUFFER_OVERFLOW;
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44 }
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45
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46 /* decode the packet header */
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47 x = 0;
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48 if ((in[x++] & 0x1F) != 0x06) {
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49 return CRYPT_INVALID_PACKET;
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50 }
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51
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52 /* get the length */
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53 if (in[x] < 128) {
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54 len = in[x++];
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55 } else {
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56 if (in[x] < 0x81 || in[x] > 0x82) {
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57 return CRYPT_INVALID_PACKET;
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58 }
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59 y = in[x++] & 0x7F;
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60 len = 0;
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61 while (y--) {
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62 len = (len << 8) | (unsigned long)in[x++];
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63 }
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64 }
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65
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66 if (len < 1 || (len + x) > inlen) {
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67 return CRYPT_INVALID_PACKET;
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68 }
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69
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70 /* decode word1 and word2 */
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71 --len;
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72 t = in[x++];
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73 words[0] = t/40;
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74 words[1] = t%40;
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75
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76 /* decode rest */
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77 y = 2;
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78 t = 0;
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79 while (len--) {
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80 t = (t << 7) | (in[x] & 0x7F);
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81 if (!(in[x++] & 0x80)) {
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82 /* store t */
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83 if (y >= *outlen) {
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84 return CRYPT_BUFFER_OVERFLOW;
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85 }
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86 words[y++] = t;
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87 t = 0;
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88 }
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89 }
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90
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 *outlen = y;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 return CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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96
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/object_identifier/der_decode_object_identifier.c,v $ */
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 /* $Revision: 1.1 $ */
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 /* $Date: 2005/05/16 15:08:11 $ */