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35 lines
1.3 KiB
C#
35 lines
1.3 KiB
C#
using Org.BouncyCastle.Crypto.Engines;
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using Org.BouncyCastle.Crypto.Modes;
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using Org.BouncyCastle.Crypto.Parameters;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace HuizhongLibrary
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{
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public class AesGcm
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{
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private static string ALGORITHM = "AES/GCM/NoPadding";
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private static int TAG_LENGTH_BIT = 128;
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private static int NONCE_LENGTH_BYTE = 12;
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public static string AesGcmDecrypt(string key,string associatedData, string nonce, string ciphertext)
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{
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GcmBlockCipher gcmBlockCipher = new GcmBlockCipher(new AesEngine());
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AeadParameters aeadParameters = new AeadParameters(
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new KeyParameter(Encoding.UTF8.GetBytes(key)),
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128,
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Encoding.UTF8.GetBytes(nonce),
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Encoding.UTF8.GetBytes(associatedData));
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gcmBlockCipher.Init(false, aeadParameters);
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byte[] data = Convert.FromBase64String(ciphertext);
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byte[] plaintext = new byte[gcmBlockCipher.GetOutputSize(data.Length)];
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int length = gcmBlockCipher.ProcessBytes(data, 0, data.Length, plaintext, 0);
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gcmBlockCipher.DoFinal(plaintext, length);
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return Encoding.UTF8.GetString(plaintext);
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}
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}
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}
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