crypto: add a crypto.des module (#13065)

vlib/crypto/des/des_test.v

@@ -0,0 +1,51 @@
+import crypto.des
+
+const (
+	key = '123456789012345678901234'.bytes()
+	iv  = 'abcdegfh'.bytes()
+	str = 'aaaaaaaa'
+)
+
+fn test_triple_des() {
+	mut src := str.bytes()
+
+	triple_des_en(mut src, key, iv)
+	assert src.hex() == '45902cf00aa1df46'
+
+	triple_des_de(mut src, key, iv)
+	assert src.bytestr() == str
+	println('test_triple_des ok')
+}
+
+fn test_des() {
+	mut src := str.bytes()
+
+	des_en(mut src, key[..8], iv)
+	assert src.hex() == '72dca13c37223cf0'
+
+	des_de(mut src, key[..8], iv)
+	assert src.bytestr() == str
+
+	println('test_des ok')
+}
+
+fn des_en(mut src []byte, key []byte, iv []byte) {
+	block := des.new_cipher(key)
+	block.encrypt(mut src, src.clone())
+}
+
+fn des_de(mut src []byte, key []byte, iv []byte) {
+	block := des.new_cipher(key)
+	block.decrypt(mut src, src.clone())
+}
+
+fn triple_des_en(mut src []byte, key []byte, iv []byte) {
+	block := des.new_triple_des_cipher(key)
+	block.encrypt(mut src, src.clone())
+}
+
+fn triple_des_de(mut src []byte, key []byte, iv []byte) {
+	block := des.new_triple_des_cipher(key)
+	inbuf := src.clone()
+	block.decrypt(mut src, inbuf)
+}