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Merge pull request #37 from houseofcat/master
Release v1.2.2
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141 changes: 141 additions & 0 deletions
141
src/HouseofCat.Encryption/AesStreamEncryptionProvider.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| using HouseofCat.Utilities.Errors; | ||
| using System; | ||
| using System.Buffers; | ||
| using System.IO; | ||
| using System.Security.Cryptography; | ||
|
|
||
| namespace HouseofCat.Encryption | ||
| { | ||
| public class AesStreamEncryptionProvider : IStreamEncryptionProvider | ||
| { | ||
| public string Type { get; } | ||
|
|
||
| private readonly ReadOnlyMemory<byte> _key; | ||
| private readonly ArrayPool<byte> _pool = ArrayPool<byte>.Shared; | ||
|
|
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| private readonly CipherMode _cipherMode; | ||
| private readonly PaddingMode _paddingMode; | ||
|
|
||
| public AesStreamEncryptionProvider( | ||
| ReadOnlyMemory<byte> key, | ||
| string hashType, | ||
| CipherMode cipherMode = CipherMode.CBC, | ||
| PaddingMode paddingMode = PaddingMode.PKCS7) | ||
| { | ||
| Guard.AgainstEmpty(key, nameof(key)); | ||
|
|
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| if (!Constants.Aes.ValidKeySizes.Contains(key.Length)) throw new ArgumentException("Keysize is an invalid length."); | ||
| _key = key; | ||
|
|
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| _cipherMode = cipherMode; | ||
| _paddingMode = paddingMode; | ||
|
|
||
| switch (_key.Length) | ||
| { | ||
| case 16: Type = $"AES{_cipherMode}_128"; break; | ||
| case 24: Type = $"AES{_cipherMode}_192"; break; | ||
| case 32: Type = $"AES{_cipherMode}_256"; break; | ||
| } | ||
|
|
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| if (!string.IsNullOrWhiteSpace(hashType)) { Type = $"HOC_{hashType}-{Type}"; } | ||
| } | ||
|
|
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| /// <summary> | ||
| /// Creates a CryptoStream from the input Stream, but with Nonce/IV size and nonce pre-appended to the Stream | ||
| /// before creating the CryptoStream. Primarily designed for FileStreams. | ||
| /// <para> | ||
| /// Byte Structure | ||
| /// </para> | ||
| /// <para> | ||
| /// IV Nonce Length (NL) | ||
| /// [ 0 - 3 ] | ||
| /// </para> | ||
| /// <para> | ||
| /// IV Nonce | ||
| /// [ 3 - (NL) ] | ||
| /// </para> | ||
| /// <para> | ||
| /// CipherText | ||
| /// [ (NL) - n ] | ||
| /// </para> | ||
| /// </summary> | ||
| /// <param name="stream"></param> | ||
| /// <returns></returns> | ||
| public CryptoStream GetEncryptStream(Stream stream, bool leaveOpen = false) | ||
| { | ||
| stream.Seek(0, SeekOrigin.Begin); | ||
|
|
||
| using AesManaged aes = new AesManaged | ||
| { | ||
| Key = _key.ToArray(), | ||
| Mode = _cipherMode, | ||
| Padding = _paddingMode, | ||
| }; | ||
|
|
||
| var nonceSize = aes.BlockSize / 8; | ||
| stream.Write(BitConverter.GetBytes(nonceSize)); | ||
| stream.Write(aes.IV, 0, aes.IV.Length); | ||
|
|
||
| return new CryptoStream( | ||
| stream, | ||
| aes.CreateEncryptor(aes.Key, aes.IV), | ||
| CryptoStreamMode.Write, | ||
| leaveOpen); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Creates a CryptoStream from the input Stream, but with Nonce/IV size and nonce pre-read to the Stream | ||
| /// before creating the CryptoStream. Primarily designed for FileStreams. | ||
| /// <para> | ||
| /// Byte Structure | ||
| /// </para> | ||
| /// <para> | ||
| /// IV Nonce Length (NL) | ||
| /// [ 0 - 3 ] | ||
| /// </para> | ||
| /// <para> | ||
| /// IV Nonce | ||
| /// [ 3 - (NL) ] | ||
| /// </para> | ||
| /// <para> | ||
| /// CipherText | ||
| /// [ (NL) - n ] | ||
| /// </para> | ||
| /// </summary> | ||
| /// <param name="stream"></param> | ||
| /// <returns></returns> | ||
| public CryptoStream GetDecryptStream(Stream stream, bool leaveOpen = false) | ||
| { | ||
| stream.Seek(0, SeekOrigin.Begin); | ||
|
|
||
| using AesManaged aes = new AesManaged | ||
| { | ||
| Key = _key.ToArray(), | ||
| Mode = _cipherMode, | ||
| Padding = _paddingMode, | ||
| }; | ||
|
|
||
| var nonceSizeBytes = _pool.Rent(4); | ||
| stream.Read(nonceSizeBytes, 0, 4); | ||
|
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| var nonceSize = BitConverter.ToInt32(nonceSizeBytes); | ||
| var nonce = _pool.Rent(nonceSize); | ||
|
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| stream.Read(nonce, 0, nonceSize); | ||
|
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| aes.IV = nonce | ||
| .AsSpan() | ||
| .Slice(0, nonceSize) | ||
| .ToArray(); | ||
|
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| _pool.Return(nonceSizeBytes); | ||
| _pool.Return(nonce); | ||
|
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| return new CryptoStream( | ||
| stream, | ||
| aes.CreateDecryptor(aes.Key, aes.IV), | ||
| CryptoStreamMode.Read, | ||
| leaveOpen); | ||
| } | ||
| } | ||
| } |
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