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/*-
* Copyright (c) 2021-2024 Ribose Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "defaults.h"
#include "repgp/repgp_def.h"
#include "dsa.h"
#include "ecdsa.h"
#include <cstddef>
namespace pgp {
namespace dsa {
pgp_hash_alg_t
Key::get_min_hash(size_t qsize)
{
/*
* I'm using _broken_ SHA1 here only because
* some old implementations may not understand keys created
* with other hashes. If you're sure we don't have to support
* such implementations, please be my guest and remove it.
*/
return (qsize < 160) ? PGP_HASH_UNKNOWN :
(qsize == 160) ? PGP_HASH_SHA1 :
(qsize <= 224) ? PGP_HASH_SHA224 :
(qsize <= 256) ? PGP_HASH_SHA256 :
(qsize <= 384) ? PGP_HASH_SHA384 :
(qsize <= 512) ? PGP_HASH_SHA512
/*(qsize>512)*/ :
PGP_HASH_UNKNOWN;
}
size_t
Key::choose_qsize(size_t psize)
{
return (psize == 1024) ? 160 : (psize <= 2047) ? 224 : (psize <= 3072) ? 256 : 0;
}
} // namespace dsa
namespace ecdsa {
pgp_hash_alg_t
get_min_hash(pgp_curve_t curve)
{
switch (curve) {
case PGP_CURVE_NIST_P_256:
case PGP_CURVE_BP256:
case PGP_CURVE_P256K1:
return PGP_HASH_SHA256;
case PGP_CURVE_NIST_P_384:
case PGP_CURVE_BP384:
return PGP_HASH_SHA384;
case PGP_CURVE_NIST_P_521:
case PGP_CURVE_BP512:
return PGP_HASH_SHA512;
default:
return PGP_HASH_UNKNOWN;
}
}
} // namespace ecdsa
} // namespace pgp