diff options
Diffstat (limited to 'core/lib/libtomcrypt/src/pk/asn1/der/utctime/der_decode_utctime.c')
| -rw-r--r-- | core/lib/libtomcrypt/src/pk/asn1/der/utctime/der_decode_utctime.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/core/lib/libtomcrypt/src/pk/asn1/der/utctime/der_decode_utctime.c b/core/lib/libtomcrypt/src/pk/asn1/der/utctime/der_decode_utctime.c new file mode 100644 index 0000000..328051d --- /dev/null +++ b/core/lib/libtomcrypt/src/pk/asn1/der/utctime/der_decode_utctime.c @@ -0,0 +1,156 @@ +/* + * Copyright (c) 2001-2007, Tom St Denis + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtom.org + */ +#include "tomcrypt.h" + +/** + @file der_decode_utctime.c + ASN.1 DER, decode a UTCTIME, Tom St Denis +*/ + +#ifdef LTC_DER + +static int char_to_int(unsigned char x) +{ + switch (x) { + case '0': return 0; + case '1': return 1; + case '2': return 2; + case '3': return 3; + case '4': return 4; + case '5': return 5; + case '6': return 6; + case '7': return 7; + case '8': return 8; + case '9': return 9; + default: + return 100; + } + return 100; +} + +#define DECODE_V(y, max) \ + y = char_to_int(buf[x])*10 + char_to_int(buf[x+1]); \ + if (y >= max) return CRYPT_INVALID_PACKET; \ + x += 2; + +/** + Decodes a UTC time structure in DER format (reads all 6 valid encoding formats) + @param in Input buffer + @param inlen Length of input buffer in octets + @param out [out] Destination of UTC time structure + @return CRYPT_OK if successful +*/ +int der_decode_utctime(const unsigned char *in, unsigned long *inlen, + ltc_utctime *out) +{ + unsigned char buf[32]; + unsigned long x; + int y; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(inlen != NULL); + LTC_ARGCHK(out != NULL); + + /* check header */ + if (*inlen < 2UL || (in[1] >= sizeof(buf)) || ((in[1] + 2UL) > *inlen)) { + return CRYPT_INVALID_PACKET; + } + + /* decode the string */ + for (x = 0; x < in[1]; x++) { + y = der_ia5_value_decode(in[x+2]); + if (y == -1) { + return CRYPT_INVALID_PACKET; + } + buf[x] = y; + } + *inlen = 2 + x; + + + /* possible encodings are +YYMMDDhhmmZ +YYMMDDhhmm+hh'mm' +YYMMDDhhmm-hh'mm' +YYMMDDhhmmssZ +YYMMDDhhmmss+hh'mm' +YYMMDDhhmmss-hh'mm' + + So let's do a trivial decode upto [including] mm + */ + + x = 0; + DECODE_V(out->YY, 100); + DECODE_V(out->MM, 13); + DECODE_V(out->DD, 32); + DECODE_V(out->hh, 24); + DECODE_V(out->mm, 60); + + /* clear timezone and seconds info */ + out->off_dir = out->off_hh = out->off_mm = out->ss = 0; + + /* now is it Z, +, - or 0-9 */ + if (buf[x] == 'Z') { + return CRYPT_OK; + } else if (buf[x] == '+' || buf[x] == '-') { + out->off_dir = (buf[x++] == '+') ? 0 : 1; + DECODE_V(out->off_hh, 24); + DECODE_V(out->off_mm, 60); + return CRYPT_OK; + } + + /* decode seconds */ + DECODE_V(out->ss, 60); + + /* now is it Z, +, - */ + if (buf[x] == 'Z') { + return CRYPT_OK; + } else if (buf[x] == '+' || buf[x] == '-') { + out->off_dir = (buf[x++] == '+') ? 0 : 1; + DECODE_V(out->off_hh, 24); + DECODE_V(out->off_mm, 60); + return CRYPT_OK; + } else { + return CRYPT_INVALID_PACKET; + } +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/utctime/der_decode_utctime.c,v $ */ +/* $Revision: 1.9 $ */ +/* $Date: 2006/12/28 01:27:24 $ */ |