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Cipher.cs
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Cipher.cs
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/*
* Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License
*/
using System;
namespace Tizen.Security.SecureRepository.Crypto
{
/// <summary>
/// This class provides the methods for encrypting and decrypting data.
/// </summary>
/// <since_tizen> 3 </since_tizen>
public class Cipher
{
private readonly CipherParameters _parameters;
/// <summary>
/// A constructor of Cipher that takes the algorithm specific parameters.
/// </summary>
/// <since_tizen> 3 </since_tizen>
/// <param name="parameters">The algorithm specific parameters.</param>
public Cipher(CipherParameters parameters)
{
_parameters = parameters;
}
/// <summary>
/// The algorithm specific parameters.
/// </summary>
/// <since_tizen> 3 </since_tizen>
public CipherParameters Parameters
{
get { return _parameters; }
}
/// <summary>
/// Decrypts data using the selected key and the algorithm.
/// </summary>
/// <since_tizen> 3 </since_tizen>
/// <param name="keyAlias">Alias of the key to be used for decryption.</param>
/// <param name="password">
/// The password used in decrypting a key value. If password of policy is
/// provided in SaveKey(), the same password should be provided.
/// </param>
/// <param name="cipherText">
/// Data to be decrypted (some algorithms may require additional information
/// embedded in encrypted data.AES GCM is an example).
/// </param>
/// <returns>Decrypted data.</returns>
/// <exception cref="ArgumentNullException">
/// The keyAlias or cipherText is null.
/// </exception>
/// <exception cref="ArgumentException">
/// The mandatory algorithm parameter is missing or invalid.
/// The optional algorithm parameter is invalid.
/// </exception>
/// <exception cref="InvalidOperationException">
/// The key-protecting password isn't matched.
/// The key does not exist with the keyAlias.
/// </exception>
/// <remarks>
/// The key type specified by keyAlias should be compatible with the algorithm
/// specified in Parameters.
/// </remarks>
public byte[] Decrypt(string keyAlias, string password, byte[] cipherText)
{
if (keyAlias == null || cipherText == null)
throw new ArgumentNullException("alias and ciphertxt should not be null");
IntPtr ptr = IntPtr.Zero;
try
{
Interop.CheckNThrowException(
Interop.CkmcManager.DecryptData(
Parameters.Ptr, keyAlias, password,
new Interop.CkmcRawBuffer(
new PinnedObject(cipherText), cipherText.Length),
out ptr),
"Failed to decrypt data");
return new SafeRawBufferHandle(ptr).Data;
}
finally
{
if (ptr != IntPtr.Zero)
Interop.CkmcTypes.BufferFree(ptr);
}
}
/// <summary>
/// Encrypts data using selected key and algorithm.
/// </summary>
/// <since_tizen> 3 </since_tizen>
/// <param name="keyAlias">Alias of the key to be used for encryption.</param>
/// <param name="password">
/// The password used in decrypting a key value. If password of policy is
/// provided in SaveKey(), the same password should be provided.
/// </param>
/// <param name="plainText">
/// Data to be encrypted. In case of the AES algorithm, there are no restrictions on
/// the size of data. For RSA, the size must be smaller or equal to (key_size_in
/// bytes - 42). Example: For 1024 RSA key, the maximum data size is
/// 1024/8 - 42 = 86.
/// </param>
/// <returns>Encrypted data.</returns>
/// <exception cref="ArgumentNullException">
/// The keyAlias or plainText is null.
/// </exception>
/// <exception cref="ArgumentException">
/// The mandatory algorithm parameter is missing or invalid.
/// The optional algorithm parameter is invalid.
/// </exception>
/// <exception cref="InvalidOperationException">
/// The key-protecting password isn't matched.
/// The key does not exist with the keyAlias.
/// </exception>
/// <remarks>
/// The key type specified by the keyAlias should be compatible with the algorithm
/// specified in Parameters.
/// </remarks>
public byte[] Encrypt(string keyAlias, string password, byte[] plainText)
{
if (keyAlias == null || plainText == null)
throw new ArgumentNullException("alias or plaintxt should not be null");
IntPtr ptr = IntPtr.Zero;
try
{
Interop.CheckNThrowException(
Interop.CkmcManager.EncryptData(
Parameters.Ptr, keyAlias, password,
new Interop.CkmcRawBuffer(
new PinnedObject(plainText), plainText.Length),
out ptr),
"Failed to encrypt data");
return new SafeRawBufferHandle(ptr).Data;
}
finally
{
if (ptr != IntPtr.Zero)
Interop.CkmcTypes.BufferFree(ptr);
}
}
}
}