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December 20, 2017 16:38
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// rustc aes_decrypt.rs -o aes_decrypt | |
// ./aes_decrypt | |
#[cfg_attr(rustfmt, rustfmt_skip)] | |
static S: [u8; 16 * 16] = [ | |
0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, | |
0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, | |
0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, | |
0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, | |
0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, | |
0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, | |
0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, | |
0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, | |
0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, | |
0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, | |
0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, | |
0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, | |
0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, | |
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, | |
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, | |
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 | |
]; | |
#[cfg_attr(rustfmt, rustfmt_skip)] | |
static SInv: [u8; 16 * 16] = [ | |
0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb, | |
0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb, | |
0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e, | |
0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25, | |
0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92, | |
0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84, | |
0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06, | |
0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b, | |
0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73, | |
0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e, | |
0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b, | |
0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4, | |
0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f, | |
0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef, | |
0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61, | |
0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d | |
]; | |
fn s_box(s: &[u8; 16 * 16], input: u8) -> u8 { | |
let x = (input >> 4) & 0xF; | |
let y = input & 0xF; | |
s[x as usize * 16 + y as usize] | |
} | |
fn g(x: u32, rc: u8) -> u32 { | |
let mut y = [0u8; 4]; | |
y[3] = ((x >> 24) & 0xFF) as _; | |
y[0] = ((x >> 16) & 0xFF) as _; | |
y[1] = ((x >> 8) & 0xFF) as _; | |
y[2] = (x & 0xFF) as _; | |
for a in &mut y { | |
*a = s_box(&S, *a); | |
} | |
(y[3] as u32) | (y[2] as u32) << 8 | (y[1] as u32) << 16 | ((y[0] ^ rc) as u32) << 24 | |
} | |
fn aes_keygen_128(input: [u32; 4], rc: u8) -> [u32; 4] { | |
let mut out = [0u32; 4]; | |
out[0] = input[0] ^ g(input[3], rc); | |
out[1] = input[1] ^ out[0]; | |
out[2] = input[2] ^ out[1]; | |
out[3] = input[3] ^ out[2]; | |
out | |
} | |
fn key_add(a: &[u32; 4], b: &[u32; 4]) -> [u32; 4] { | |
let mut ret = [0; 4]; | |
for (x, (y, z)) in ret.iter_mut().zip(a.iter().zip(b.iter())) { | |
*x = y ^ z; | |
} | |
ret | |
} | |
macro_rules! bit_set{ | |
($i:expr, $x:expr, $v:expr) => { | |
$x ^= ($v & 1) << $i; | |
} | |
} | |
macro_rules! bit_get{ | |
($i:expr, $v:expr) => { | |
{($v & (1 << $i)) >> $i} | |
} | |
} | |
// * (x) mod P(x) | |
fn mul_x(i: u8) -> u8 { | |
let mut ret = i << 1; | |
bit_set!(4, ret, bit_get!(7, i)); | |
bit_set!(3, ret, bit_get!(7, i)); | |
bit_set!(1, ret, bit_get!(7, i)); | |
bit_set!(0, ret, bit_get!(7, i)); | |
ret | |
} | |
// * (x^2) mod P(x) | |
fn mul_x_pow_2(i: u8) -> u8 { | |
let mut ret = i << 2; | |
bit_set!(5, ret, bit_get!(7, i)); | |
bit_set!(4, ret, bit_get!(7, i) ^ bit_get!(6, i)); | |
bit_set!(3, ret, bit_get!(6, i)); | |
bit_set!(2, ret, bit_get!(7, i)); | |
bit_set!(1, ret, bit_get!(7, i) ^ bit_get!(6, i)); | |
bit_set!(0, ret, bit_get!(6, i)); | |
ret | |
} | |
// * (x^3) mod P(x) | |
fn mul_x_pow_3(i: u8) -> u8 { | |
let mut ret = i << 3; | |
bit_set!(6, ret, bit_get!(7, i)); | |
bit_set!(5, ret, bit_get!(7, i) ^ bit_get!(6, i)); | |
bit_set!(4, ret, bit_get!(6, i) ^ bit_get!(5, i)); | |
bit_set!(3, ret, bit_get!(7, i) ^ bit_get!(5, i)); | |
bit_set!(2, ret, bit_get!(7, i) ^ bit_get!(6, i)); | |
bit_set!(1, ret, bit_get!(6, i) ^ bit_get!(5, i)); | |
bit_set!(0, ret, bit_get!(5, i)); | |
ret | |
} | |
// * (x^3 + 1) | |
fn mul9(i: u8) -> u8 { | |
mul_x_pow_3(i) ^ i | |
} | |
// * (x^3 + x + 1) | |
fn mulb(i: u8) -> u8 { | |
mul_x_pow_3(i) ^ mul_x(i) ^ i | |
} | |
// * (x^3 + x^2 + 1) | |
fn muld(i: u8) -> u8 { | |
mul_x_pow_3(i) ^ mul_x_pow_2(i) ^ i | |
} | |
// * (x^3 + x^2 + x) | |
fn mule(i: u8) -> u8 { | |
mul_x_pow_3(i) ^ mul_x_pow_2(i) ^ mul_x(i) | |
} | |
fn mix_columns(i: u32) -> u32 { | |
let mut ret = 0; | |
let i0 = ((i >> 24) & 0xFF) as u8; | |
let i1 = ((i >> 16) & 0xFF) as u8; | |
let i2 = ((i >> 8) & 0xFF) as u8; | |
let i3 = ((i >> 0) & 0xFF) as u8; | |
ret |= ((mule(i0) ^ mulb(i1) ^ muld(i2) ^ mul9(i3)) as u32) << 24; | |
ret |= ((mul9(i0) ^ mule(i1) ^ mulb(i2) ^ muld(i3)) as u32) << 16; | |
ret |= ((muld(i0) ^ mul9(i1) ^ mule(i2) ^ mulb(i3)) as u32) << 8; | |
ret |= ((mulb(i0) ^ muld(i1) ^ mul9(i2) ^ mule(i3)) as u32) << 0; | |
ret | |
} | |
macro_rules! shift { | |
(@left, $v:expr, $i:expr) => { | |
($v & 0xFF) << $i | |
}; | |
(@right, $v:expr, $i:expr) => { | |
($v >> $i) & 0xFF | |
}; | |
} | |
fn inv_shift_rows(i: &[u32; 4]) -> [u32; 4] { | |
let mut ret = [0; 4]; | |
// first row | |
ret[0] |= shift!(@left, shift!(@right, i[0], 24), 24); | |
ret[1] |= shift!(@left, shift!(@right, i[1], 24), 24); | |
ret[2] |= shift!(@left, shift!(@right, i[2], 24), 24); | |
ret[3] |= shift!(@left, shift!(@right, i[3], 24), 24); | |
// second row | |
ret[0] |= shift!(@left, shift!(@right, i[3], 16), 16); | |
ret[1] |= shift!(@left, shift!(@right, i[0], 16), 16); | |
ret[2] |= shift!(@left, shift!(@right, i[1], 16), 16); | |
ret[3] |= shift!(@left, shift!(@right, i[2], 16), 16); | |
// third row | |
ret[0] |= shift!(@left, shift!(@right, i[2], 8), 8); | |
ret[1] |= shift!(@left, shift!(@right, i[3], 8), 8); | |
ret[2] |= shift!(@left, shift!(@right, i[0], 8), 8); | |
ret[3] |= shift!(@left, shift!(@right, i[1], 8), 8); | |
// fourth row | |
ret[0] |= shift!(@left, shift!(@right, i[1], 0), 0); | |
ret[1] |= shift!(@left, shift!(@right, i[2], 0), 0); | |
ret[2] |= shift!(@left, shift!(@right, i[3], 0), 0); | |
ret[3] |= shift!(@left, shift!(@right, i[0], 0), 0); | |
ret | |
} | |
fn inv_sbox(i: &[u32; 4]) -> [u32; 4] { | |
let mut ret = [0; 4]; | |
for (r, &i) in ret.iter_mut().zip(i.iter()) { | |
*r |= shift!(@left, s_box(&SInv, shift!(@right, i, 24) as u8) as u32, 24); | |
*r |= shift!(@left, s_box(&SInv, shift!(@right, i, 16) as u8) as u32, 16); | |
*r |= shift!(@left, s_box(&SInv, shift!(@right, i, 8) as u8) as u32, 8); | |
*r |= shift!(@left, s_box(&SInv, shift!(@right, i, 0) as u8) as u32, 0); | |
} | |
ret | |
} | |
fn print(text: &str, a: &[u32]) { | |
println!("\\text{{{}}} &= ", text); | |
println!("\\left( \\begin{{matrix}}"); | |
print!("{:02X} & ", shift!(@right, a[0], 24)); | |
print!("{:02X} & ", shift!(@right, a[1], 24)); | |
print!("{:02X} & ", shift!(@right, a[2], 24)); | |
println!("{:02X} \\\\ ", shift!(@right, a[3], 24)); | |
print!("{:02X} & ", shift!(@right, a[0], 16)); | |
print!("{:02X} & ", shift!(@right, a[1], 16)); | |
print!("{:02X} & ", shift!(@right, a[2], 16)); | |
println!("{:02X} \\\\ ", shift!(@right, a[3], 16)); | |
print!("{:02X} & ", shift!(@right, a[0], 8)); | |
print!("{:02X} & ", shift!(@right, a[1], 8)); | |
print!("{:02X} & ", shift!(@right, a[2], 8)); | |
println!("{:02X} \\\\ ", shift!(@right, a[3], 8)); | |
print!("{:02X} & ", shift!(@right, a[0], 0)); | |
print!("{:02X} & ", shift!(@right, a[1], 0)); | |
print!("{:02X} & ", shift!(@right, a[2], 0)); | |
println!("{:02X} \\\\ ", shift!(@right, a[3], 0)); | |
println!("\\end{{matrix}} \\right)"); | |
println!("\\\\"); | |
} | |
fn main() { | |
let round_input = [0x54015CFC, 0x8752C1E6, 0x61EF26F9, 0xE2A6E5D4]; | |
let k0 = [0xF2A02596, 0x96EF693C, 0xA7102B8D, 0xB5253A3F]; | |
let k1 = aes_keygen_128(k0, 0b1); | |
println!("$"); | |
println!("\\begin{{aligned}}[t]"); | |
print("$k_1$", &k1); | |
let after_key_add = key_add(&round_input, &k1); | |
print("Zustand nach dem Key Addition Layer $k_1$", &after_key_add); | |
let after_mix_columns = [ | |
mix_columns(after_key_add[0]), | |
mix_columns(after_key_add[1]), | |
mix_columns(after_key_add[2]), | |
mix_columns(after_key_add[3]), | |
]; | |
print( | |
"Zustand nach dem inversen MixColumns Layer", | |
&after_mix_columns, | |
); | |
let after_shift_rows = inv_shift_rows(&after_mix_columns); | |
print( | |
"Zustand nach dem inversen ShiftRows Layer", | |
&after_shift_rows, | |
); | |
let after_inv_sbox = inv_sbox(&after_shift_rows); | |
print( | |
"Zustand nach der inversen Byte Substitution", | |
&after_inv_sbox, | |
); | |
let after_final_add = key_add(&after_inv_sbox, &k0); | |
print( | |
"Zustand nach dem Key Addition Layer $k_0$", | |
&after_final_add, | |
); | |
print("AES Klartext", &after_final_add); | |
println!("\\end{{aligned}}"); | |
println!("$"); | |
} |
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