Mercurial > dropbear
view libtomcrypt/src/pk/asn1/der/octet/der_decode_octet_string.c @ 325:0e4f225b7e07
Add -N "no remote command" dbclient option.
Document -N in dbclient.1 and -P in dropbear.8
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Wed, 07 Jun 2006 15:01:20 +0000 |
parents | 1b9e69c058d2 |
children | 0cbe8f6dbf9e |
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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.org */ #include "tomcrypt.h" /** @file der_decode_octet_string.c ASN.1 DER, encode a OCTET STRING, Tom St Denis */ #ifdef LTC_DER /** Store a OCTET STRING @param in The DER encoded OCTET STRING @param inlen The size of the DER OCTET STRING @param out [out] The array of octets stored (one per char) @param outlen [in/out] The number of octets stored @return CRYPT_OK if successful */ int der_decode_octet_string(const unsigned char *in, unsigned long inlen, unsigned char *out, unsigned long *outlen) { unsigned long x, y, len; LTC_ARGCHK(in != NULL); LTC_ARGCHK(out != NULL); LTC_ARGCHK(outlen != NULL); /* must have header at least */ if (inlen < 2) { return CRYPT_INVALID_PACKET; } /* check for 0x04 */ if ((in[0] & 0x1F) != 0x04) { return CRYPT_INVALID_PACKET; } x = 1; /* decode the length */ if (in[x] & 0x80) { /* valid # of bytes in length are 1,2,3 */ y = in[x] & 0x7F; if ((y == 0) || (y > 3) || ((x + y) > inlen)) { return CRYPT_INVALID_PACKET; } /* read the length in */ len = 0; ++x; while (y--) { len = (len << 8) | in[x++]; } } else { len = in[x++] & 0x7F; } /* is it too long? */ if (len > *outlen) { return CRYPT_BUFFER_OVERFLOW; } if (len + x > inlen) { return CRYPT_INVALID_PACKET; } /* read the data */ for (y = 0; y < len; y++) { out[y] = in[x++]; } *outlen = y; return CRYPT_OK; } #endif /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/octet/der_decode_octet_string.c,v $ */ /* $Revision: 1.1 $ */ /* $Date: 2005/05/16 15:08:11 $ */