crypto: crypto.aes CBC mode moves to crypto.cipher (#13084)

vlib/crypto/cipher/aes_cbc_test.v

@@ -0,0 +1,32 @@
+// Copyright (c) 2019-2022 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+import crypto.aes
+import crypto.cipher
+
+fn test_aes_cbc() {
+	key := '6368616e676520746869732070617373'.bytes()
+	iv := '1234567890123456'.bytes()
+	str := '73c86d43a9d700a253a96c85b0f6b03ac9792e0e757f869cca306bd3cba1c62b'
+
+	mut src := str.bytes()
+
+	aes_cbc_en(mut src, key, iv)
+	assert src.hex() == '20f36e39e6b73a040d3d39445d0282369033693076d1129a68a3364c00a81c508ec06ab94ff5104c321939fbfb9313c549fd68df100a8a23e8006a863733a8fd'
+
+	aes_cbc_de(mut src, key, iv)
+	assert src.bytestr() == str
+	println('test_aes_cbc ok')
+}
+
+fn aes_cbc_en(mut src []byte, key []byte, iv []byte) {
+	block := aes.new_cipher(key)
+	mode := cipher.new_cbc(block, iv)
+	mode.encrypt_blocks(mut src, src.clone())
+}
+
+fn aes_cbc_de(mut src []byte, key []byte, iv []byte) {
+	block := aes.new_cipher(key)
+	mut mode := cipher.new_cbc(block, iv)
+	mode.decrypt_blocks(mut src, src.clone())
+}