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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftCrypto open source project
//
// Copyright (c) 2019-2020 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
//
//===----------------------------------------------------------------------===//
import XCTest
#if CRYPTO_IN_SWIFTPM && !CRYPTO_IN_SWIFTPM_FORCE_BUILD_API
// Skip tests that require @testable imports of CryptoKit.
#else
#if !CRYPTO_IN_SWIFTPM_FORCE_BUILD_API
@testable import CryptoKit
#else
@testable import Crypto
#endif
class DERTests: XCTestCase {
func testEncodeDecodeECDSASignature() throws {
let pointSize = self.coordinateSizeForCurve(P256.self)
let r = self.randomBytes(count: pointSize)
let s = self.randomBytes(count: pointSize)
let signature = try orFail { try P256.Signing.ECDSASignature(rawRepresentation: (r + s)) }
XCTAssertEqual(Data(r + s), signature.rawRepresentation)
let der = try orFail { try P256.Signing.ECDSASignature(derRepresentation: signature.derRepresentation) }
XCTAssertEqual(der.rawRepresentation, signature.rawRepresentation)
XCTAssertEqual(der.derRepresentation, signature.derRepresentation)
XCTAssertEqual(der.rawRepresentation.count, 64)
}
func coordinateSizeForCurve<Curve: SupportedCurveDetailsImpl>(_ curve: Curve.Type) -> Int {
#if !CRYPTO_IN_SWIFTPM_FORCE_BUILD_API
return self.coreCryptoCoordinateSizeForCurve(curve)
#else
return self.openSSLCoordinateSizeForCurve(curve)
#endif
}
func randomBytes(count: Int) -> [UInt8] {
#if canImport(Darwin) || os(Linux) || os(Android) || os(Windows)
var rng = SystemRandomNumberGenerator()
return (0..<count).map { _ in rng.next() }
#else
fatalError("No secure random number generator on this platform.")
#endif
}
}
#endif // CRYPTO_IN_SWIFTPM
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