h1emu-core 1.2.3

Utility library used in h1emu.
Documentation 
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use wasm_bindgen::prelude::*;

#[wasm_bindgen]
pub struct RC4 {
    s: [u8; 256],
    i: u8,
    j: u8,
}

#[wasm_bindgen]
impl RC4 {
    #[wasm_bindgen(constructor)]
    pub fn initialize(given_key: Vec<u8>) -> RC4 {
        let mut rc4 = RC4 {
            s: [0; 256],
            i: 0,
            j: 0,
        };

        for k in 0..256 {
            rc4.s[k] = k as u8;
        }

        let mut l: u8 = 0;
        for k in 0..=255 {
            l = l
                .wrapping_add(given_key[(k % given_key.len() as u8) as usize])
                .wrapping_add(rc4.s[k as usize]);
            rc4.s.swap(k.into(), l as usize);
        }
        rc4
    }

    #[wasm_bindgen]
    pub fn encrypt(&mut self, mut data: Vec<u8>) -> Vec<u8> {
        for k in 0..data.len() {
            self.i = self.i.wrapping_add(1);
            let i = self.i as usize;
            self.j = self.j.wrapping_add(self.s[i]);
            let j = self.j as usize;

            self.s.swap(i, j);
            let si = self.s[i];
            let sj = self.s[j];
            data[k] ^= self.s[si.wrapping_add(sj) as usize];
        }

        data
    }

    #[wasm_bindgen]
    pub fn decrypt(&mut self, data: Vec<u8>) -> Vec<u8> {
        self.encrypt(data)
    }
}

#[cfg(test)]
mod tests {

    #[test]
    fn rc4_create_key() {
        let key: [u8; 16] = [
            23, 189, 8, 107, 27, 148, 240, 47, 240, 236, 83, 215, 99, 88, 155, 95,
        ];
        let rc4_obj = super::RC4::initialize(key.to_vec());
        assert_eq!(
            rc4_obj.s,
            [
                23, 213, 73, 77, 20, 5, 162, 252, 41, 184, 123, 134, 148, 219, 211, 96, 111, 61,
                87, 43, 18, 76, 179, 120, 232, 239, 46, 79, 143, 66, 230, 100, 80, 62, 146, 13,
                112, 58, 60, 149, 19, 190, 9, 249, 12, 48, 255, 182, 25, 54, 30, 103, 246, 191,
                229, 75, 129, 136, 144, 63, 70, 107, 215, 166, 231, 6, 155, 206, 81, 251, 248, 101,
                28, 74, 159, 40, 127, 183, 31, 78, 130, 4, 164, 132, 243, 220, 177, 45, 24, 124,
                114, 221, 122, 225, 247, 57, 72, 3, 242, 108, 109, 178, 90, 133, 67, 224, 150, 188,
                16, 0, 235, 119, 71, 22, 55, 222, 140, 39, 65, 99, 53, 44, 10, 153, 141, 92, 173,
                84, 189, 217, 156, 218, 201, 117, 93, 193, 145, 181, 195, 192, 98, 11, 165, 154,
                33, 152, 32, 34, 203, 228, 104, 56, 126, 194, 175, 38, 142, 110, 214, 223, 254,
                202, 69, 205, 198, 170, 86, 244, 118, 1, 29, 212, 227, 157, 185, 147, 27, 196, 89,
                105, 253, 174, 168, 68, 208, 102, 187, 26, 216, 138, 180, 226, 137, 94, 161, 200,
                176, 113, 139, 245, 91, 240, 95, 204, 8, 47, 241, 209, 158, 52, 50, 131, 128, 21,
                238, 51, 2, 88, 35, 116, 42, 250, 64, 15, 85, 83, 163, 14, 106, 207, 59, 37, 234,
                237, 171, 167, 236, 97, 160, 233, 82, 36, 151, 186, 121, 172, 115, 199, 197, 17,
                135, 169, 49, 7, 210, 125
            ]
        )
    }
    #[test]
    fn rc4_enc() {
        let key: [u8; 16] = [
            23, 189, 8, 107, 27, 148, 240, 47, 240, 236, 83, 215, 99, 88, 155, 95,
        ];
        let data: [u8; 34] = [
            5, 1, 0, 0, 0, 0, 0, 0, 0, 21, 0, 0, 0, 2, 1, 0, 0, 0, 3, 0, 0, 0, 1, 0, 0, 0, 4, 0, 0,
            0, 116, 101, 115, 116,
        ];
        let mut rc4_obj = super::RC4::initialize(key.to_vec());
        let data_result = rc4_obj.encrypt(data.to_vec());
        assert_eq!(
            data_result,
            [
                174, 183, 184, 67, 241, 64, 165, 4, 140, 6, 35, 87, 102, 206, 169, 26, 83, 24, 215,
                183, 41, 116, 190, 249, 143, 205, 14, 169, 236, 237, 190, 129, 81, 214
            ]
        )
    }
}