isBlockCipherPadding

import dcrypt.crypto.padding.pkcs7;
import dcrypt.crypto.engines.aes;

PaddedBufferedBlockCipher!(AES, PKCS7Pad) c;

immutable ubyte[] key = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];
ubyte[] plain = new ubyte[65];
ubyte[] output = new ubyte[96];

foreach(plainTextLength; [0,1,15,16,17,24,31,32,33,63,64,65]) { // some odd number, smaller than one block, larger than two blocks

	plain.length = plainTextLength;

	foreach(i,ref b; plain) {
		b = cast(ubyte)i;
	}

	output.length = ((plainTextLength/c.blockSize)+2)*c.blockSize; // next even block size

	c.start(true, key);

	size_t len = c.processBytes(plain, output);
	len += c.doFinal(output[len..$]);
	output = output[0..len]; // crop slice to its size

	ubyte[] cipher = output.dup;
	output[] = 0;
	c.start(false, key);
	len = c.processBytes(cipher, output);
	len += c.doFinal(output[len..$]);

	assert(len == plain.length, "length does not match");
	assert(output[0..len] == plain, "decrypted ciphertext is not equal to original plaintext");
}