Annotation of embedaddon/strongswan/src/libstrongswan/plugins/pgp/pgp_encoder.c, revision 1.1
1.1 ! misho 1: /*
! 2: * Copyright (C) 2009 Martin Willi
! 3: * HSR Hochschule fuer Technik Rapperswil
! 4: *
! 5: * This program is free software; you can redistribute it and/or modify it
! 6: * under the terms of the GNU General Public License as published by the
! 7: * Free Software Foundation; either version 2 of the License, or (at your
! 8: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
! 9: *
! 10: * This program is distributed in the hope that it will be useful, but
! 11: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
! 12: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
! 13: * for more details.
! 14: */
! 15:
! 16: #include "pgp_encoder.h"
! 17:
! 18: #include <library.h>
! 19: #include <utils/debug.h>
! 20:
! 21: /**
! 22: * Build a PGPv3 fingerprint
! 23: */
! 24: static bool build_v3_fingerprint(chunk_t *encoding, va_list args)
! 25: {
! 26: hasher_t *hasher;
! 27: chunk_t n, e;
! 28:
! 29: if (cred_encoding_args(args, CRED_PART_RSA_MODULUS, &n,
! 30: CRED_PART_RSA_PUB_EXP, &e, CRED_PART_END))
! 31: {
! 32: hasher = lib->crypto->create_hasher(lib->crypto, HASH_MD5);
! 33: if (!hasher)
! 34: {
! 35: DBG1(DBG_LIB, "MD5 hash algorithm not supported, PGP"
! 36: " fingerprinting failed");
! 37: return FALSE;
! 38: }
! 39: /* remove leading zero bytes before hashing modulus and exponent */
! 40: while (n.len > 0 && n.ptr[0] == 0x00)
! 41: {
! 42: n = chunk_skip(n, 1);
! 43: }
! 44: while (e.len > 0 && e.ptr[0] == 0x00)
! 45: {
! 46: e = chunk_skip(e, 1);
! 47: }
! 48: if (!hasher->allocate_hash(hasher, n, NULL) ||
! 49: !hasher->allocate_hash(hasher, e, encoding))
! 50: {
! 51: hasher->destroy(hasher);
! 52: return FALSE;
! 53: }
! 54: hasher->destroy(hasher);
! 55: return TRUE;
! 56: }
! 57: return FALSE;
! 58: }
! 59:
! 60: /**
! 61: * See header.
! 62: */
! 63: bool pgp_encoder_encode(cred_encoding_type_t type, chunk_t *encoding,
! 64: va_list args)
! 65: {
! 66: switch (type)
! 67: {
! 68: case KEYID_PGPV3:
! 69: return build_v3_fingerprint(encoding, args);
! 70: default:
! 71: return FALSE;
! 72: }
! 73: }
! 74:
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