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Like AES-GCM and AES-CCM, the macOS build uses OpenSSL for the implementation. Co-authored-by: Adeel Mujahid <3840695+am11@users.noreply.github.com>
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| Original file line number | Diff line number | Diff line change |
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@@ -2,3 +2,4 @@ | |
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| #cmakedefine01 HAVE_OPENSSL_EC2M | ||
| #cmakedefine01 HAVE_OPENSSL_ALPN | ||
| #cmakedefine01 HAVE_OPENSSL_CHACHA20POLY1305 | ||
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136 changes: 136 additions & 0 deletions
136
...ecurity.Cryptography.Algorithms/src/System/Security/Cryptography/ChaCha20Poly1305.Unix.cs
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| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
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| using System.Diagnostics; | ||
| using System.Diagnostics.CodeAnalysis; | ||
| using Microsoft.Win32.SafeHandles; | ||
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| namespace System.Security.Cryptography | ||
| { | ||
| public sealed partial class ChaCha20Poly1305 | ||
| { | ||
| public static bool IsSupported { get; } = Interop.Crypto.EvpChaCha20Poly1305() != IntPtr.Zero; | ||
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| private SafeEvpCipherCtxHandle _ctxHandle; | ||
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| [MemberNotNull(nameof(_ctxHandle))] | ||
| private void ImportKey(ReadOnlySpan<byte> key) | ||
| { | ||
| _ctxHandle = Interop.Crypto.EvpCipherCreatePartial(GetCipher(key.Length * 8)); | ||
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| Interop.Crypto.CheckValidOpenSslHandle(_ctxHandle); | ||
| Interop.Crypto.EvpCipherSetKeyAndIV( | ||
| _ctxHandle, | ||
| key, | ||
| Span<byte>.Empty, | ||
| Interop.Crypto.EvpCipherDirection.NoChange); | ||
| } | ||
|
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| private void EncryptCore( | ||
| ReadOnlySpan<byte> nonce, | ||
| ReadOnlySpan<byte> plaintext, | ||
| Span<byte> ciphertext, | ||
| Span<byte> tag, | ||
| ReadOnlySpan<byte> associatedData = default) | ||
| { | ||
| Interop.Crypto.EvpCipherSetKeyAndIV( | ||
| _ctxHandle, | ||
| Span<byte>.Empty, | ||
| nonce, | ||
| Interop.Crypto.EvpCipherDirection.Encrypt); | ||
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| if (associatedData.Length != 0) | ||
| { | ||
| if (!Interop.Crypto.EvpCipherUpdate(_ctxHandle, Span<byte>.Empty, out _, associatedData)) | ||
| { | ||
| throw Interop.Crypto.CreateOpenSslCryptographicException(); | ||
| } | ||
| } | ||
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| if (!Interop.Crypto.EvpCipherUpdate(_ctxHandle, ciphertext, out int ciphertextBytesWritten, plaintext)) | ||
| { | ||
| throw Interop.Crypto.CreateOpenSslCryptographicException(); | ||
| } | ||
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| if (!Interop.Crypto.EvpCipherFinalEx( | ||
| _ctxHandle, | ||
| ciphertext.Slice(ciphertextBytesWritten), | ||
| out int bytesWritten)) | ||
| { | ||
| throw Interop.Crypto.CreateOpenSslCryptographicException(); | ||
| } | ||
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| ciphertextBytesWritten += bytesWritten; | ||
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| if (ciphertextBytesWritten != ciphertext.Length) | ||
| { | ||
| Debug.Fail($"ChaCha20Poly1305 encrypt wrote {ciphertextBytesWritten} of {ciphertext.Length} bytes."); | ||
| throw new CryptographicException(); | ||
| } | ||
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| Interop.Crypto.EvpCipherGetAeadTag(_ctxHandle, tag); | ||
| } | ||
|
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| private void DecryptCore( | ||
| ReadOnlySpan<byte> nonce, | ||
| ReadOnlySpan<byte> ciphertext, | ||
| ReadOnlySpan<byte> tag, | ||
| Span<byte> plaintext, | ||
| ReadOnlySpan<byte> associatedData) | ||
| { | ||
| Interop.Crypto.EvpCipherSetKeyAndIV( | ||
| _ctxHandle, | ||
| ReadOnlySpan<byte>.Empty, | ||
| nonce, | ||
| Interop.Crypto.EvpCipherDirection.Decrypt); | ||
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| if (associatedData.Length != 0) | ||
| { | ||
| if (!Interop.Crypto.EvpCipherUpdate(_ctxHandle, Span<byte>.Empty, out _, associatedData)) | ||
| { | ||
| throw Interop.Crypto.CreateOpenSslCryptographicException(); | ||
| } | ||
| } | ||
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| if (!Interop.Crypto.EvpCipherUpdate(_ctxHandle, plaintext, out int plaintextBytesWritten, ciphertext)) | ||
| { | ||
| throw Interop.Crypto.CreateOpenSslCryptographicException(); | ||
| } | ||
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| Interop.Crypto.EvpCipherSetAeadTag(_ctxHandle, tag); | ||
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| if (!Interop.Crypto.EvpCipherFinalEx( | ||
| _ctxHandle, | ||
| plaintext.Slice(plaintextBytesWritten), | ||
| out int bytesWritten)) | ||
| { | ||
| CryptographicOperations.ZeroMemory(plaintext); | ||
| throw new CryptographicException(SR.Cryptography_AuthTagMismatch); | ||
| } | ||
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| plaintextBytesWritten += bytesWritten; | ||
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| if (plaintextBytesWritten != plaintext.Length) | ||
| { | ||
| Debug.Fail($"ChaCha20Poly1305 decrypt wrote {plaintextBytesWritten} of {plaintext.Length} bytes."); | ||
| throw new CryptographicException(); | ||
| } | ||
| } | ||
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| private static IntPtr GetCipher(int keySizeInBits) | ||
| { | ||
| switch (keySizeInBits) | ||
| { | ||
| case 256: return Interop.Crypto.EvpChaCha20Poly1305(); | ||
| default: | ||
| Debug.Fail("Key size should already be validated"); | ||
| return IntPtr.Zero; | ||
| } | ||
| } | ||
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| public void Dispose() | ||
| { | ||
| _ctxHandle.Dispose(); | ||
| } | ||
| } | ||
| } |
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