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#![no_std] extern crate byteorder; mod ops; use byteorder::{ ByteOrder, LittleEndian }; pub use ops::Hc128Rng; /// ``` /// use hc128::HC128; /// let mut output = [0; 64]; /// /// let mut key = [0; 16]; /// key[0] = 0x80; /// HC128::new(&key, &[0; 16]).process(&[0; 64], &mut output); /// assert_eq!( /// output[..32], /// [ /// 0x37, 0x86, 0x02, 0xB9, 0x8F, 0x32, 0xA7, 0x48, 0x47, 0x51, 0x56, 0x54, 0xAE, 0x0D, 0xE7, 0xED, /// 0x8F, 0x72, 0xBC, 0x34, 0x77, 0x6A, 0x06, 0x51, 0x03, 0xE5, 0x15, 0x95, 0x52, 0x1F, 0xFE, 0x47 /// ] /// ); /// assert_eq!( /// output[32..], /// [ /// 0xF9, 0xAF, 0x0A, 0x4C, 0xB4, 0x79, 0x99, 0xCF, 0xA2, 0x6D, 0x33, 0xBF, 0x80, 0x95, 0x45, 0x98, /// 0x9D, 0x53, 0xDE, 0xBF, 0xE7, 0xA9, 0xEF, 0xD8, 0xB9, 0x10, 0x9C, 0xA6, 0xEF, 0xAD, 0xDF, 0x83 /// ] /// ); /// /// HC128::new( /// &[0x0F, 0x62, 0xB5, 0x08, 0x5B, 0xAE, 0x01, 0x54, 0xA7, 0xFA, 0x4D, 0xA0, 0xF3, 0x46, 0x99, 0xEC], /// &[0x28, 0x8F, 0xF6, 0x5D, 0xC4, 0x2B, 0x92, 0xF9, 0x60, 0xC7, 0x2E, 0x95, 0xFC, 0x63, 0xCA, 0x31] /// ).process(&[0; 32], &mut output); /// assert_eq!( /// output[..32], /// [ /// 0x1C, 0xD8, 0xAE, 0xDD, 0xFE, 0x52, 0xE2, 0x17, 0xE8, 0x35, 0xD0, 0xB7, 0xE8, 0x4E, 0x29, 0x22, /// 0xD0, 0x4B, 0x1A, 0xDB, 0xCA, 0x53, 0xC4, 0x52, 0x2B, 0x1A, 0xA6, 0x04, 0xC4, 0x28, 0x56, 0xA9 /// ] /// ); /// /// let output = HC128::new( /// &[0x0F, 0x62, 0xB5, 0x08, 0x5B, 0xAE, 0x01, 0x54, 0xA7, 0xFA, 0x4D, 0xA0, 0xF3, 0x46, 0x99, 0xEC], /// &[0x28, 0x8F, 0xF6, 0x5D, 0xC4, 0x2B, 0x92, 0xF9, 0x60, 0xC7, 0x2E, 0x95, 0xFC, 0x63, 0xCA, 0x31] /// ).skip(65472).take(32).collect::<Vec<u8>>(); /// assert_eq!( /// output, /// [ /// 0xBB, 0x59, 0x9F, 0x93, 0xF4, 0xF2, 0x44, 0xD7, 0x17, 0xCA, 0x98, 0x18, 0x21, 0x2B, 0x06, 0xD5, /// 0x6D, 0x99, 0xAD, 0x4C, 0xA1, 0xF7, 0x87, 0x25, 0xDB, 0xA8, 0x9E, 0xA1, 0xD1, 0xF0, 0x5B, 0x27 /// ] /// ); /// /// let mut output = [0; 32]; /// let mut cipher = HC128::new( /// &[0x0F, 0x62, 0xB5, 0x08, 0x5B, 0xAE, 0x01, 0x54, 0xA7, 0xFA, 0x4D, 0xA0, 0xF3, 0x46, 0x99, 0xEC], /// &[0x28, 0x8F, 0xF6, 0x5D, 0xC4, 0x2B, 0x92, 0xF9, 0x60, 0xC7, 0x2E, 0x95, 0xFC, 0x63, 0xCA, 0x31] /// ); /// cipher.process(&[0; 11], &mut output[..11]); /// cipher.process(&[0; 21], &mut output[11..]); /// assert_eq!( /// output, /// [ /// 0x1C, 0xD8, 0xAE, 0xDD, 0xFE, 0x52, 0xE2, 0x17, 0xE8, 0x35, 0xD0, 0xB7, 0xE8, 0x4E, 0x29, 0x22, /// 0xD0, 0x4B, 0x1A, 0xDB, 0xCA, 0x53, 0xC4, 0x52, 0x2B, 0x1A, 0xA6, 0x04, 0xC4, 0x28, 0x56, 0xA9 /// ] /// ); /// ``` #[derive(Clone)] pub struct HC128 { inner: Hc128Rng, buff: u32, count: usize } impl HC128 { pub fn new(key: &[u8], iv: &[u8]) -> HC128 { let mut w = [0; 1280]; for i in 0..4 { w[i] = LittleEndian::read_u32(&key[(i * 4)..((i + 1) * 4)]); w[i + 8] = LittleEndian::read_u32(&iv[(i * 4)..((i + 1) * 4)]); w[i + 4] = w[i]; w[i + 8 + 4] = w[i + 8]; } HC128 { inner: Hc128Rng::with_w(&mut w), buff: 0, count: 0 } } pub fn process(&mut self, input: &[u8], output: &mut [u8]) { let mut pos = 0; if self.count != 0 && input.len() >= self.count { pos += self.count; for (i, b) in self.take(pos).enumerate() { output[i] = input[i] ^ b; } } while pos + 4 <= input.len() { LittleEndian::write_u32( &mut output[pos..pos + 4], LittleEndian::read_u32(&input[pos..pos + 4]) ^ self.inner.gen() ); pos += 4; } for b in self.take(input.len() - pos) { output[pos] = input[pos] ^ b; pos += 1; } } } impl Iterator for HC128 { type Item = u8; fn next(&mut self) -> Option<Self::Item> { if self.count == 0 { self.buff = self.inner.gen(); self.count = 4; } let output = (self.buff & 0xff) as u8; self.buff >>= 8; self.count -= 1; Some(output) } }