70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
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* Copyright (C) 2009 Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "pgp_encoder.h"
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#include <debug.h>
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/**
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* Build a PGPv3 fingerprint
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*/
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static bool build_v3_fingerprint(chunk_t *encoding, va_list args)
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{
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hasher_t *hasher;
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chunk_t n, e;
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if (cred_encoding_args(args, CRED_PART_RSA_MODULUS, &n,
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CRED_PART_RSA_PUB_EXP, &e, CRED_PART_END))
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{
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hasher = lib->crypto->create_hasher(lib->crypto, HASH_MD5);
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if (!hasher)
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{
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DBG1(DBG_LIB, "MD5 hash algorithm not supported, PGP"
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" fingerprinting failed");
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return FALSE;
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}
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/* remove leading zero bytes before hashing modulus and exponent */
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while (n.len > 0 && n.ptr[0] == 0x00)
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{
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n = chunk_skip(n, 1);
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}
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while (e.len > 0 && e.ptr[0] == 0x00)
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{
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e = chunk_skip(e, 1);
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}
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hasher->allocate_hash(hasher, n, NULL);
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hasher->allocate_hash(hasher, e, encoding);
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hasher->destroy(hasher);
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return TRUE;
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}
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return FALSE;
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}
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/**
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* See header.
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*/
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bool pgp_encoder_encode(cred_encoding_type_t type, chunk_t *encoding,
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va_list args)
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{
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switch (type)
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{
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case KEYID_PGPV3:
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return build_v3_fingerprint(encoding, args);
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default:
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return FALSE;
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}
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}
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