/* 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://libtomcrypt.com */#include "tomcrypt.h"/**  @file der_encode_utctime.c  ASN.1 DER, encode a  UTCTIME, Tom St Denis*/#ifdef LTC_DERstatic const char *baseten = "0123456789";#define STORE_V(y) \    out[x++] = der_ia5_char_encode(baseten[(y/10) % 10]); \    out[x++] = der_ia5_char_encode(baseten[y % 10]);/**  Encodes a UTC time structure in DER format  @param utctime      The UTC time structure to encode  @param out          The destination of the DER encoding of the UTC time structure  @param outlen       [in/out] The length of the DER encoding  @return CRYPT_OK if successful*/int der_encode_utctime(ltc_utctime *utctime,                        unsigned char *out,   unsigned long *outlen){    unsigned long x, tmplen;    int           err;     LTC_ARGCHK(utctime != NULL);    LTC_ARGCHK(out     != NULL);    LTC_ARGCHK(outlen  != NULL);    if ((err = der_length_utctime(utctime, &tmplen)) != CRYPT_OK) {       return err;    }    if (tmplen > *outlen) {        *outlen = tmplen;        return CRYPT_BUFFER_OVERFLOW;    }        /* store header */    out[0] = 0x17;    /* store values */    x = 2;    STORE_V(utctime->YY);    STORE_V(utctime->MM);    STORE_V(utctime->DD);    STORE_V(utctime->hh);    STORE_V(utctime->mm);    STORE_V(utctime->ss);    if (utctime->off_mm || utctime->off_hh) {       out[x++] = der_ia5_char_encode(utctime->off_dir ? '-' : '+');       STORE_V(utctime->off_hh);       STORE_V(utctime->off_mm);    } else {       out[x++] = der_ia5_char_encode('Z');    }    /* store length */    out[1] = (unsigned char)(x - 2);       /* all good let's return */    *outlen = x;    return CRYPT_OK;}#endif/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/utctime/der_encode_utctime.c,v $ *//* $Revision: 1.9 $ *//* $Date: 2006/12/04 21:34:03 $ */