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using System;
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namespace Renci.SshNet.Security.Cryptography
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{
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/// <summary>
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/// Base class for symmetric cipher implementations.
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/// </summary>
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public abstract class SymmetricCipher : Cipher
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{
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/// <summary>
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/// Gets the key.
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/// </summary>
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protected byte[] Key { get; private set; }
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/// <summary>
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/// Initializes a new instance of the <see cref="SymmetricCipher"/> class.
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/// </summary>
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/// <param name="key">The key.</param>
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/// <exception cref="ArgumentNullException"><paramref name="key"/> is <c>null</c>.</exception>
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protected SymmetricCipher(byte[] key)
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{
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if (key == null)
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throw new ArgumentNullException("key");
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Key = key;
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}
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/// <summary>
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/// Encrypts the specified region of the input byte array and copies the encrypted data to the specified region of the output byte array.
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/// </summary>
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/// <param name="inputBuffer">The input data to encrypt.</param>
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/// <param name="inputOffset">The offset into the input byte array from which to begin using data.</param>
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/// <param name="inputCount">The number of bytes in the input byte array to use as data.</param>
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/// <param name="outputBuffer">The output to which to write encrypted data.</param>
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/// <param name="outputOffset">The offset into the output byte array from which to begin writing data.</param>
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/// <returns>
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/// The number of bytes encrypted.
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/// </returns>
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public abstract int EncryptBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset);
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/// <summary>
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/// Decrypts the specified region of the input byte array and copies the decrypted data to the specified region of the output byte array.
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/// </summary>
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/// <param name="inputBuffer">The input data to decrypt.</param>
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/// <param name="inputOffset">The offset into the input byte array from which to begin using data.</param>
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/// <param name="inputCount">The number of bytes in the input byte array to use as data.</param>
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/// <param name="outputBuffer">The output to which to write decrypted data.</param>
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/// <param name="outputOffset">The offset into the output byte array from which to begin writing data.</param>
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/// <returns>
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/// The number of bytes decrypted.
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/// </returns>
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public abstract int DecryptBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset);
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}
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}
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