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/*
* Copyright (c) 2019-2020, [Ribose Inc](https://www.ribose.com).
* 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 OWNER 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 <string.h>
#include <assert.h>
#include "defaults.h"
#include "utils.h"
#include "stream-ctx.h"
rnp_result_t
rnp_ctx_t::add_encryption_password(const std::string &password,
pgp_hash_alg_t halg,
pgp_symm_alg_t ealg,
size_t iterations)
{
rnp_symmetric_pass_info_t info = {};
info.s2k.usage = PGP_S2KU_ENCRYPTED_AND_HASHED;
info.s2k.specifier = PGP_S2KS_ITERATED_AND_SALTED;
info.s2k.hash_alg = halg;
ctx->rng.get(info.s2k.salt, sizeof(info.s2k.salt));
if (!iterations) {
iterations = ctx->s2k_iterations(halg);
}
if (!iterations) {
return RNP_ERROR_BAD_PARAMETERS;
}
info.s2k.iterations = pgp_s2k_encode_iterations(iterations);
info.s2k_cipher = ealg;
/* Note: we're relying on the fact that a longer-than-needed key length
* here does not change the entire derived key (it just generates unused
* extra bytes at the end). We derive a key of our maximum supported length,
* which is a bit wasteful.
*
* This is done because we do not yet know what cipher this key will actually
* end up being used with until later.
*
* An alternative would be to keep a list of actual passwords and s2k params,
* and save the key derivation for later.
*/
if (!pgp_s2k_derive_key(&info.s2k, password.c_str(), info.key.data(), info.key.size())) {
return RNP_ERROR_GENERIC;
}
passwords.push_back(info);
return RNP_SUCCESS;
}
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