import "crypto/des"

func ExampleNewTripleDESCipher() {
	// NewTripleDESCipher can also be used when EDE2 is required by
	// duplicating the first 8 bytes of the 16-byte key.
	ede2Key := []byte("example key 1234")

	var tripleDESKey []byte
	tripleDESKey = append(tripleDESKey, ede2Key[:16]...)
	tripleDESKey = append(tripleDESKey, ede2Key[:8]...)

	_, err := des.NewTripleDESCipher(tripleDESKey)
	if err != nil {
		panic(err)
	}

}

// A tripleDESCipher is an instance of TripleDES encryption.
type tripleDESCipher struct {
	cipher1, cipher2, cipher3 desCipher
}

// NewTripleDESCipher creates and returns a new [cipher.Block].
func NewTripleDESCipher(key []byte) (cipher.Block, error) {
	if len(key) != 24 {
		return nil, KeySizeError(len(key))
	}

	c := new(tripleDESCipher)
	c.cipher1.generateSubkeys(key[:8])

		c, _ := des.NewTripleDESCipher(tt.key)
		out := make([]byte, len(tt.in))
		c.Encrypt(out, tt.in)

		if !bytes.Equal(out, tt.out) {
			t.Errorf("#%d: result: %x want: %x", i, out, tt.out)
		}
	}
}

func TestDecryptTripleDES(t *testing.T) {
	for i, tt := range encryptTripleDESTests {
		c, _ := des.NewTripleDESCipher(tt.key)

		plain := make([]byte, len(tt.in))

	cipher:     PEMCipherDES,
	name:       "DES-CBC",
	cipherFunc: des.NewCipher,
	keySize:    8,
	blockSize:  des.BlockSize,
}, {
	cipher:     PEMCipher3DES,
	name:       "DES-EDE3-CBC",
	cipherFunc: des.NewTripleDESCipher,
	keySize:    24,
	blockSize:  des.BlockSize,
}, {
	cipher:     PEMCipherAES128,
	name:       "AES-128-CBC",
	cipherFunc: aes.NewCipher,
	keySize:    16,
	blockSize:  aes.BlockSize,
}, {

	}
	return false
}

func cipherRC4(key, iv []byte, isRead bool) any {
	cipher, _ := rc4.NewCipher(key)
	return cipher
}

func cipher3DES(key, iv []byte, isRead bool) any {
	block, _ := des.NewTripleDESCipher(key)
	if isRead {
		return cipher.NewCBCDecrypter(block, iv)
	}
	return cipher.NewCBCEncrypter(block, iv)
}

func cipherAES(key, iv []byte, isRead bool) any {
	block, _ := aes.NewCipher(key)

		{"StreamWriter.W", Field, 0},
	},
	"crypto/des": {
		{"(KeySizeError).Error", Method, 0},
		{"BlockSize", Const, 0},
		{"KeySizeError", Type, 0},
		{"NewCipher", Func, 0},
		{"NewTripleDESCipher", Func, 0},
	},
	"crypto/dsa": {
		{"ErrInvalidPublicKey", Var, 0},
		{"GenerateKey", Func, 0},
		{"GenerateParameters", Func, 0},
		{"L1024N160", Const, 0},
		{"L2048N224", Const, 0},

pkg crypto/cipher, type StreamWriter struct, W io.Writer
pkg crypto/des, const BlockSize ideal-int
pkg crypto/des, func NewCipher([]uint8) (cipher.Block, error)
pkg crypto/des, func NewTripleDESCipher([]uint8) (cipher.Block, error)
pkg crypto/des, method (KeySizeError) Error() string
pkg crypto/des, type KeySizeError int
pkg crypto/dsa, const L1024N160 ParameterSizes
pkg crypto/dsa, const L2048N224 ParameterSizes