Using Deimos OpenSSL binding

gistfile1.d

import std.stdio;
import std.exception : enforce;
import deimos.openssl.aes;
import deimos.openssl.rand;

void main()
{
	auto message = randBytes(100);
	writeln(message);

	AES_KEY keyEnc;
	AES_KEY keyDec;
	auto userKey = randBytes(32);

	AES_set_encrypt_key(userKey.ptr, 256, &keyEnc);
	AES_set_decrypt_key(userKey.ptr, 256, &keyDec);

	ubyte[AES_BLOCK_SIZE] ivec = randBytes(AES_BLOCK_SIZE);
	auto ivecOrig = ivec.dup;

	auto encrypted = new ubyte[](message.length +
		(message.length % AES_BLOCK_SIZE != 0
			? AES_BLOCK_SIZE - (message.length % AES_BLOCK_SIZE)
			: 0));
	AES_cbc_encrypt(message.ptr, encrypted.ptr, message.length, &keyEnc, ivec.ptr, AES_ENCRYPT);

	auto decrypted = new ubyte[](message.length);
	AES_cbc_encrypt(encrypted.ptr, decrypted.ptr, message.length, &keyDec, ivecOrig.ptr, AES_DECRYPT);

	writeln(encrypted);
	writeln(decrypted);

	enforce(message == decrypted);
}

ubyte[] randBytes(int len) {
	ubyte[] arr;
	arr.length = len;
	RAND_bytes(arr.ptr, len);

	return arr;
}