triple_des_set_key (partial)

func desSetOddParity(key []byte) {
    kOddParity := []byte{
        1, 1, 2, 2, 4, 4, 7, 7, 8, 8, 11, 11, 13, 13, 14,
        14, 16, 16, 19, 19, 21, 21, 22, 22, 25, 25, 26, 26, 28, 28,
        31, 31, 32, 32, 35, 35, 37, 37, 38, 38, 41, 41, 42, 42, 44,
        44, 47, 47, 49, 49, 50, 50, 52, 52, 55, 55, 56, 56, 59, 59,
        61, 61, 62, 62, 64, 64, 67, 67, 69, 69, 70, 70, 73, 73, 74,
        74, 76, 76, 79, 79, 81, 81, 82, 82, 84, 84, 87, 87, 88, 88,
        91, 91, 93, 93, 94, 94, 97, 97, 98, 98, 100, 100, 103, 103, 104,
        104, 107, 107, 109, 109, 110, 110, 112, 112, 115, 115, 117, 117, 118, 118,
        121, 121, 122, 122, 124, 124, 127, 127, 128, 128, 131, 131, 133, 133, 134,
        134, 137, 137, 138, 138, 140, 140, 143, 143, 145, 145, 146, 146, 148, 148,
        151, 151, 152, 152, 155, 155, 157, 157, 158, 158, 161, 161, 162, 162, 164,
        164, 167, 167, 168, 168, 171, 171, 173, 173, 174, 174, 176, 176, 179, 179,
        181, 181, 182, 182, 185, 185, 186, 186, 188, 188, 191, 191, 193, 193, 194,
        194, 196, 196, 199, 199, 200, 200, 203, 203, 205, 205, 206, 206, 208, 208,
        211, 211, 213, 213, 214, 214, 217, 217, 218, 218, 220, 220, 223, 223, 224,
        224, 227, 227, 229, 229, 230, 230, 233, 233, 234, 234, 236, 236, 239, 239,
        241, 241, 242, 242, 244, 244, 247, 247, 248, 248, 251, 251, 253, 253, 254,
        254,
    }

    for i := 0; i < len(key); i++ {
        key[i] = kOddParity[key[i]]
    }
}

func TripleDesSchedule(deskey []byte, key []byte) []byte {
    if len(deskey) != 14 {
        panic("deskey must be 14 bytes")
    }

    tmp := make([]byte, 14)
    copy(tmp, deskey[:])

    for i := 0; i < len(key); i++ {
        tmp[(i % len(tmp))] ^= key[i]
    }

    tripleDesKey := make([]byte, 16)
    tripleDesKey[0] = tmp[0] & 0xfe
    tripleDesKey[1] = ((tmp[0] << 7) | (tmp[1] >> 1)) & 0xfe
    tripleDesKey[2] = ((tmp[1] << 6) | (tmp[2] >> 2)) & 0xfe
    tripleDesKey[3] = ((tmp[2] << 5) | (tmp[3] >> 3)) & 0xfe
    tripleDesKey[4] = ((tmp[3] << 4) | (tmp[4] >> 4)) & 0xfe
    tripleDesKey[5] = ((tmp[4] << 3) | (tmp[5] >> 5)) & 0xfe
    tripleDesKey[6] = ((tmp[5] << 2) | (tmp[6] >> 6)) & 0xfe
    tripleDesKey[7] = tmp[6] << 1
    tripleDesKey[8] = tmp[7] & 0xfe
    tripleDesKey[9] = ((tmp[7] << 7) | (tmp[8] >> 1)) & 0xfe
    tripleDesKey[10] = ((tmp[8] << 6) | (tmp[9] >> 2)) & 0xfe
    tripleDesKey[11] = ((tmp[9] << 5) | (tmp[10] >> 3)) & 0xfe
    tripleDesKey[12] = ((tmp[10] << 4) | (tmp[11] >> 4)) & 0xfe
    tripleDesKey[13] = ((tmp[11] << 3) | (tmp[12] >> 5)) & 0xfe
    tripleDesKey[14] = ((tmp[12] << 2) | (tmp[13] >> 6)) & 0xfe
    tripleDesKey[15] = tmp[13] << 1

    desSetOddParity(tripleDesKey[:8])
    desSetOddParity(tripleDesKey[8:])

    return tripleDesKey
}