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/* Copyright 2015 OpenMarket Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef UTILITY_HH_
#define UTILITY_HH_
#include "olm/error.h"
#include <cstddef>
#include <cstdint>
struct _olm_ed25519_public_key;
namespace olm {
struct Utility {
Utility();
OlmErrorCode last_error;
/** The length of a SHA-256 hash in bytes. */
std::size_t sha256_length();
/** Compute a SHA-256 hash. Returns the length of the SHA-256 hash in bytes
* on success. Returns std::size_t(-1) on failure. On failure last_error
* will be set with an error code. If the output buffer was too small then
* last error will be OUTPUT_BUFFER_TOO_SMALL. */
std::size_t sha256(
std::uint8_t const * input, std::size_t input_length,
std::uint8_t * output, std::size_t output_length
);
/** Verify a ed25519 signature. Returns std::size_t(0) on success. Returns
* std::size_t(-1) on failure or if the signature was invalid. On failure
* last_error will be set with an error code. If the signature was too short
* or was not a valid signature then last_error will be BAD_MESSAGE_MAC. */
std::size_t ed25519_verify(
_olm_ed25519_public_key const & key,
std::uint8_t const * message, std::size_t message_length,
std::uint8_t const * signature, std::size_t signature_length
);
};
} // namespace olm
#endif /* UTILITY_HH_ */
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