old_crypto_rs/
null.rs

1use crate::Block;
2
3/// A basic, do-nothing, cipher.
4pub struct NullCipher;
5
6impl NullCipher {
7    /// NewCipher creates a new instance of cipher.Block
8    pub fn new() -> Self {
9        NullCipher
10    }
11}
12
13impl Block for NullCipher {
14    /// BlockSize is part of the interface
15    fn block_size(&self) -> usize {
16        1
17    }
18
19    /// Encrypt is part of the interface
20    fn encrypt(&self, dst: &mut [u8], src: &[u8]) -> usize {
21        dst[..src.len()].copy_from_slice(src);
22        src.len()
23    }
24
25    /// Decrypt is part of the interface
26    fn decrypt(&self, dst: &mut [u8], src: &[u8]) -> usize {
27        dst[..src.len()].copy_from_slice(src);
28        src.len()
29    }
30}
31
32#[cfg(test)]
33mod tests {
34    use super::*;
35
36    #[test]
37    fn test_new_cipher() {
38        let _ = NullCipher::new();
39    }
40
41    #[test]
42    fn test_null_cipher_block_size() {
43        let c = NullCipher::new();
44        assert_eq!(c.block_size(), 1);
45    }
46
47    #[test]
48    fn test_null_cipher_encrypt() {
49        let c = NullCipher::new();
50        let tests = [
51            ("ABCDE", "ABCDE"),
52            ("COUCOU", "COUCOU"),
53        ];
54
55        for (pt, ct) in tests {
56            let plain = pt.as_bytes();
57            let mut cipher = vec![0u8; plain.len()];
58            c.encrypt(&mut cipher, plain);
59            assert_eq!(cipher, ct.as_bytes());
60        }
61    }
62
63    #[test]
64    fn test_null_cipher_decrypt() {
65        let c = NullCipher::new();
66        let tests = [
67            ("ABCDE", "ABCDE"),
68            ("COUCOU", "COUCOU"),
69        ];
70
71        for (pt, ct) in tests {
72            let cipher = ct.as_bytes();
73            let mut plain = vec![0u8; cipher.len()];
74            c.decrypt(&mut plain, cipher);
75            assert_eq!(plain, pt.as_bytes());
76        }
77    }
78}
old_crypto_rs/null.rs

old_crypto_rs/
null.rs
