feistel0 decrypt
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@ -123,6 +123,50 @@ pub fn encrypt(plaintext: u32, keys: Vec<u16>, verbose: bool) -> u32 {
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return ciphertext;
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}
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#[test]
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/// test the block decryption against the given value
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fn test_decrypt() {
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let keys = key_scheduler(0x1337);
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let plaintext = 0xb00b00;
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let ciphertext = encrypt(plaintext, keys.clone(), true);
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let deciphertext = decrypt(ciphertext, keys.clone(), true);
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assert_eq!(ciphertext, deciphertext);
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}
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/// decrypt a given plaintext with a given key vec
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pub fn decrypt(ciphertext: u32, mut keys: Vec<u16>, verbose: bool) -> u32 {
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assert_eq!(keys.len(), ROUNDS as usize);
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let mut lef: u16 = ((ciphertext & 0xffff0000) >> 16).try_into().expect("boom");
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let mut rig: u16 = ((ciphertext & 0x0000ffff) >> 0).try_into().expect("boom");
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if verbose {
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println!("input:\n{:08x}\n{:04x}\n {:04x}", ciphertext, lef, rig);
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}
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// swap lef rig
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let tmp = rig;
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rig = lef;
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lef = tmp;
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// reverse keys
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keys.reverse();
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// do the thing
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encrypt(ciphertext, keys, verbose);
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// swap lef rig back
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let tmp = rig;
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rig = lef;
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lef = tmp;
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let mut plaintext: u32 = 0;
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plaintext |= (lef as u32) << 16;
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plaintext |= rig as u32;
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if verbose {
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println!("returning plaintext:\n{:08x}", plaintext);
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}
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return plaintext;
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}
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/// returns the value of the sbox for any input
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///
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/// max index is 0xf
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@ -220,7 +220,7 @@ pub fn main() {
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println!("{}", result)
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}
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else {
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println!("result is {} ({:016x})", result, result)
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println!("result is {} ({:08x})", result, result)
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}
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}
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}
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