コード例 #1
0
ファイル: PKCS12.cs プロジェクト: softworkz/Emby
		private SymmetricAlgorithm GetSymmetricAlgorithm (string algorithmOid, byte[] salt, int iterationCount)
		{
			string algorithm = null;
			int keyLength = 8;	// 64 bits (default)
			int ivLength = 8;	// 64 bits (default)

			PKCS12.DeriveBytes pd = new PKCS12.DeriveBytes ();
			pd.Password = _password; 
			pd.Salt = salt;
			pd.IterationCount = iterationCount;

			switch (algorithmOid) {
				case PKCS5.pbeWithMD2AndDESCBC:			// no unit test available
					pd.HashName = "MD2";
					algorithm = "DES";
					break;
				case PKCS5.pbeWithMD5AndDESCBC:			// no unit test available
					pd.HashName = "MD5";
					algorithm = "DES";
					break;
				case PKCS5.pbeWithMD2AndRC2CBC:			// no unit test available
					// TODO - RC2-CBC-Parameter (PKCS5)
					// if missing default to 32 bits !!!
					pd.HashName = "MD2";
					algorithm = "RC2";
					keyLength = 4;		// default
					break;
				case PKCS5.pbeWithMD5AndRC2CBC:			// no unit test available
					// TODO - RC2-CBC-Parameter (PKCS5)
					// if missing default to 32 bits !!!
					pd.HashName = "MD5";
					algorithm = "RC2";
					keyLength = 4;		// default
					break;
				case PKCS5.pbeWithSHA1AndDESCBC: 		// no unit test available
					pd.HashName = "SHA1";
					algorithm = "DES";
					break;
				case PKCS5.pbeWithSHA1AndRC2CBC:		// no unit test available
					// TODO - RC2-CBC-Parameter (PKCS5)
					// if missing default to 32 bits !!!
					pd.HashName = "SHA1";
					algorithm = "RC2";
					keyLength = 4;		// default
					break;
				case PKCS12.pbeWithSHAAnd128BitRC4: 		// no unit test available
					pd.HashName = "SHA1";
					algorithm = "RC4";
					keyLength = 16;
					ivLength = 0;		// N/A
					break;
				case PKCS12.pbeWithSHAAnd40BitRC4: 		// no unit test available
					pd.HashName = "SHA1";
					algorithm = "RC4";
					keyLength = 5;
					ivLength = 0;		// N/A
					break;
				case PKCS12.pbeWithSHAAnd3KeyTripleDESCBC: 
					pd.HashName = "SHA1";
					algorithm = "TripleDES";
					keyLength = 24;
					break;
				case PKCS12.pbeWithSHAAnd2KeyTripleDESCBC:	// no unit test available
					pd.HashName = "SHA1";
					algorithm = "TripleDES";
					keyLength = 16;
					break;
				case PKCS12.pbeWithSHAAnd128BitRC2CBC: 		// no unit test available
					pd.HashName = "SHA1";
					algorithm = "RC2";
					keyLength = 16;
					break;
				case PKCS12.pbeWithSHAAnd40BitRC2CBC: 
					pd.HashName = "SHA1";
					algorithm = "RC2";
					keyLength = 5;
					break;
				default:
					throw new NotSupportedException ("unknown oid " + algorithm);
			}

			SymmetricAlgorithm sa = null;
            sa = SymmetricAlgorithm.Create(algorithm);
            sa.Key = pd.DeriveKey (keyLength);
			// IV required only for block ciphers (not stream ciphers)
			if (ivLength > 0) {
				sa.IV = pd.DeriveIV (ivLength);
				sa.Mode = CipherMode.CBC;
			}
			return sa;
		}