1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
6 * The library is free for all purposes without any express
9 * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com
14 @file der_decode_object_identifier.c
15 ASN.1 DER, Decode Object Identifier, Tom St Denis
20 Decode OID data and store the array of integers in words
21 @param in The OID DER encoded data
22 @param inlen The length of the OID data
23 @param words [out] The destination of the OID words
24 @param outlen [in/out] The number of OID words
25 @return CRYPT_OK if successful
27 int der_decode_object_identifier(const unsigned char *in, unsigned long inlen,
28 unsigned long *words, unsigned long *outlen)
30 unsigned long x, y, t, len;
32 LTC_ARGCHK(in != NULL);
33 LTC_ARGCHK(words != NULL);
34 LTC_ARGCHK(outlen != NULL);
36 /* header is at least 3 bytes */
38 return CRYPT_INVALID_PACKET;
41 /* must be room for at least two words */
43 return CRYPT_BUFFER_OVERFLOW;
46 /* decode the packet header */
48 if ((in[x++] & 0x1F) != 0x06) {
49 return CRYPT_INVALID_PACKET;
56 if (in[x] < 0x81 || in[x] > 0x82) {
57 return CRYPT_INVALID_PACKET;
62 len = (len << 8) | (unsigned long)in[x++];
66 if (len < 1 || (len + x) > inlen) {
67 return CRYPT_INVALID_PACKET;
74 t = (t << 7) | (in[x] & 0x7F);
75 if (!(in[x++] & 0x80)) {
78 return CRYPT_BUFFER_OVERFLOW;
97 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/object_identifier/der_decode_object_identifier.c,v $ */
98 /* $Revision: 1.5 $ */
99 /* $Date: 2006/11/21 00:18:23 $ */