public static unsafe bool TryExportToPem <T>( T arg, string label, TryExportKeyAction <T> exporter, Span <char> destination, out int charsWritten) { int bufferSize = 4096; while (true) { byte[] buffer = CryptoPool.Rent(bufferSize); int bytesWritten = 0; bufferSize = buffer.Length; // Fixed to prevent GC moves. fixed(byte *bufferPtr = buffer) { try { if (exporter(arg, buffer, out bytesWritten)) { Span <byte> writtenSpan = new Span <byte>(buffer, 0, bytesWritten); return(PemEncoding.TryWrite(label, writtenSpan, destination, out charsWritten)); } } finally { CryptoPool.Return(buffer, bytesWritten); } bufferSize = checked (bufferSize * 2); } } }
internal static string CreatePemFromData(string label, ReadOnlyMemory <byte> data) { int pemSize = PemEncoding.GetEncodedSize(label.Length, data.Length); return(string.Create(pemSize, (label, data), static (destination, args) => { (string label, ReadOnlyMemory <byte> data) = args; if (!PemEncoding.TryWrite(label, data.Span, destination, out int charsWritten) || charsWritten != destination.Length) { Debug.Fail("Pre-allocated buffer was not the correct size."); throw new CryptographicException(); } }));
public static unsafe bool TryExportToEncryptedPem <T>( T arg, ReadOnlySpan <char> password, PbeParameters pbeParameters, TryExportEncryptedKeyAction <T> exporter, Span <char> destination, out int charsWritten) { int bufferSize = 4096; while (true) { byte[] buffer = CryptoPool.Rent(bufferSize); int bytesWritten = 0; bufferSize = buffer.Length; // Fixed to prevent GC moves. fixed(byte *bufferPtr = buffer) { try { if (exporter(arg, password, pbeParameters, buffer, out bytesWritten)) { Span <byte> writtenSpan = new Span <byte>(buffer, 0, bytesWritten); return(PemEncoding.TryWrite(PemLabels.EncryptedPkcs8PrivateKey, writtenSpan, destination, out charsWritten)); } } finally { CryptoPool.Return(buffer, bytesWritten); } bufferSize = checked (bufferSize * 2); } } }