isBlockCipherPadding

1 import dcrypt.blockcipher.padding.pkcs7;
2 import dcrypt.blockcipher.aes;
3 
4 PaddedBufferedBlockCipher!(AES, PKCS7Pad) c;
5 
6 immutable ubyte[] key = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];
7 ubyte[] plain = new ubyte[65];
8 ubyte[] output = new ubyte[96];
9 
10 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
11 
12 	plain.length = plainTextLength;
13 
14 	foreach(i,ref b; plain) {
15 		b = cast(ubyte)i;
16 	}
17 
18 	output.length = ((plainTextLength/c.blockSize)+2)*c.blockSize; // next even block size
19 
20 	c.start(true, key);
21 
22 	size_t len = c.processBytes(plain, output);
23 	len += c.doFinal(output[len..$]);
24 	output = output[0..len]; // crop slice to its size
25 
26 	ubyte[] cipher = output.dup;
27 	output[] = 0;
28 	c.start(false, key);
29 	len = c.processBytes(cipher, output);
30 	len += c.doFinal(output[len..$]);
31 
32 	assert(len == plain.length, "length does not match");
33 	assert(output[0..len] == plain, "decrypted ciphertext is not equal to original plaintext");
34 }