Mercurial > dropbear
view libtomcrypt/src/pk/asn1/der/octet/der_encode_octet_string.c @ 556:ccdc4c6183c0
- Payload length doesn't include macsize.
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Sun, 26 Jul 2009 16:11:27 +0000 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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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, [email protected], http://libtomcrypt.com */ #include "tomcrypt.h" /** @file der_encode_octet_string.c ASN.1 DER, encode a OCTET STRING, Tom St Denis */ #ifdef LTC_DER /** Store an OCTET STRING @param in The array of OCTETS to store (one per char) @param inlen The number of OCTETS to store @param out [out] The destination for the DER encoded OCTET STRING @param outlen [in/out] The max size and resulting size of the DER OCTET STRING @return CRYPT_OK if successful */ int der_encode_octet_string(const unsigned char *in, unsigned long inlen, unsigned char *out, unsigned long *outlen) { unsigned long x, y, len; int err; LTC_ARGCHK(in != NULL); LTC_ARGCHK(out != NULL); LTC_ARGCHK(outlen != NULL); /* get the size */ if ((err = der_length_octet_string(inlen, &len)) != CRYPT_OK) { return err; } /* too big? */ if (len > *outlen) { *outlen = len; return CRYPT_BUFFER_OVERFLOW; } /* encode the header+len */ x = 0; out[x++] = 0x04; if (inlen < 128) { out[x++] = (unsigned char)inlen; } else if (inlen < 256) { out[x++] = 0x81; out[x++] = (unsigned char)inlen; } else if (inlen < 65536UL) { out[x++] = 0x82; out[x++] = (unsigned char)((inlen>>8)&255); out[x++] = (unsigned char)(inlen&255); } else if (inlen < 16777216UL) { out[x++] = 0x83; out[x++] = (unsigned char)((inlen>>16)&255); out[x++] = (unsigned char)((inlen>>8)&255); out[x++] = (unsigned char)(inlen&255); } else { return CRYPT_INVALID_ARG; } /* store octets */ for (y = 0; y < inlen; y++) { out[x++] = in[y]; } /* retun length */ *outlen = x; return CRYPT_OK; } #endif /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/octet/der_encode_octet_string.c,v $ */ /* $Revision: 1.4 $ */ /* $Date: 2006/12/04 21:34:03 $ */