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/* 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.org
*/
#include "tomcrypt.h"
/**
@file der_length_octet_string.c
ASN.1 DER, get length of OCTET STRING, Tom St Denis
*/
#ifdef LTC_DER
/**
Gets length of DER encoding of OCTET STRING
@param noctets The number of octets in the string to encode
@param outlen [out] The length of the DER encoding for the given string
@return CRYPT_OK if successful
*/
int der_length_octet_string(unsigned long noctets, unsigned long *outlen)
{
LTC_ARGCHK(outlen != NULL);
if (noctets < 128) {
/* 04 LL DD DD DD ... */
*outlen = 2 + noctets;
} else if (noctets < 256) {
/* 04 81 LL DD DD DD ... */
*outlen = 3 + noctets;
} else if (noctets < 65536UL) {
/* 04 82 LL LL DD DD DD ... */
*outlen = 4 + noctets;
} else if (noctets < 16777216UL) {
/* 04 83 LL LL LL DD DD DD ... */
*outlen = 5 + noctets;
} else {
return CRYPT_INVALID_ARG;
}
return CRYPT_OK;
}
#endif
/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/octet/der_length_octet_string.c,v $ */
/* $Revision: 1.1 $ */
/* $Date: 2005/05/16 15:08:11 $ */
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