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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftCrypto open source project
//
// Copyright (c) 2019 Apple Inc. and the SwiftCrypto project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.md for the list of SwiftCrypto project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
#if CRYPTO_IN_SWIFTPM && !CRYPTO_IN_SWIFTPM_FORCE_BUILD_API
@_exported import CryptoKit
#else
@_implementationOnly import CCryptoBoringSSL
/// A wrapper around BoringSSL's EC_POINT with some lifetime management.
@usableFromInline
class EllipticCurvePoint {
/* private but @usableFromInline */ @usableFromInline var _basePoint: OpaquePointer
@usableFromInline
init(multiplying scalar: ArbitraryPrecisionInteger, on group: BoringSSLEllipticCurveGroup) throws {
self._basePoint = try group.withUnsafeGroupPointer { groupPtr in
guard let basePoint = CCryptoBoringSSL_EC_POINT_new(groupPtr) else {
throw CryptoKitError.internalBoringSSLError()
}
return basePoint
}
try group.withUnsafeGroupPointer { groupPtr in
try scalar.withUnsafeBignumPointer { bigNumPtr in
guard CCryptoBoringSSL_EC_POINT_mul(groupPtr, self._basePoint, bigNumPtr, nil, nil, nil) != 0 else {
throw CryptoKitError.internalBoringSSLError()
}
}
}
}
init(copying pointer: OpaquePointer, on group: BoringSSLEllipticCurveGroup) throws {
self._basePoint = try group.withUnsafeGroupPointer { groupPtr in
guard let basePoint = CCryptoBoringSSL_EC_POINT_dup(pointer, groupPtr) else {
throw CryptoKitError.internalBoringSSLError()
}
return basePoint
}
}
deinit {
CCryptoBoringSSL_EC_POINT_free(self._basePoint)
}
}
// MARK: - Helpers
extension EllipticCurvePoint {
@inlinable
func withPointPointer<T>(_ body: (OpaquePointer) throws -> T) rethrows -> T {
try body(self._basePoint)
}
@usableFromInline
func affineCoordinates(group: BoringSSLEllipticCurveGroup) throws -> (x: ArbitraryPrecisionInteger, y: ArbitraryPrecisionInteger) {
var x = ArbitraryPrecisionInteger()
var y = ArbitraryPrecisionInteger()
try x.withUnsafeMutableBignumPointer { xPtr in
try y.withUnsafeMutableBignumPointer { yPtr in
try group.withUnsafeGroupPointer { groupPtr in
guard CCryptoBoringSSL_EC_POINT_get_affine_coordinates_GFp(groupPtr, self._basePoint, xPtr, yPtr, nil) != 0 else {
throw CryptoKitError.internalBoringSSLError()
}
}
}
}
return (x: x, y: y)
}
}
#endif // CRYPTO_IN_SWIFTPM && !CRYPTO_IN_SWIFTPM_FORCE_BUILD_API
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