Initialize AES S-Box directly
This commit is contained in:
parent
aab8f99dd4
commit
1ce9bff7d3
SSH key fingerprint:
SHA256:OLTRf6Fl87G52SiR7sWLGNzlJt4WOX+tfI2yxo0z7xk
116
aes/const.go
116
aes/const.go
|
|
@ -14,9 +14,21 @@
|
|||
package aes
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"math/bits"
|
||||
)
|
||||
|
||||
// This file generates AES constants - 8720 bytes of initialized data.
|
||||
|
||||
// https://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
|
||||
|
||||
// AES is based on the mathematical behavior of binary polynomials
|
||||
// (polynomials over GF(2)) modulo the irreducible polynomial x⁸ + x⁴ + x³ + x + 1.
|
||||
// Addition of these binary polynomials corresponds to binary xor.
|
||||
// Reducing mod poly corresponds to binary xor with poly every
|
||||
// time a 0x100 bit appears.
|
||||
const poly = 1<<8 | 1<<4 | 1<<3 | 1<<1 | 1<<0 // x⁸ + x⁴ + x³ + x + 1
|
||||
|
||||
// Multiply b and c as GF(2) polynomials modulo poly
|
||||
func mul(b, c uint32) uint32 {
|
||||
i := b
|
||||
|
|
@ -40,78 +52,48 @@ func mul(b, c uint32) uint32 {
|
|||
return s
|
||||
}
|
||||
|
||||
// This file contains AES constants - 8720 bytes of initialized data.
|
||||
// sbox0 FIPS-197 Figure 7. S-box substitution values generation
|
||||
var sbox0 = func() (sbox [256]byte) {
|
||||
var p, q uint8 = 1, 1
|
||||
for {
|
||||
/* multiply p by 3 */
|
||||
if p&0x80 != 0 {
|
||||
p ^= (p << 1) ^ 0x1b
|
||||
} else {
|
||||
p ^= p << 1
|
||||
}
|
||||
|
||||
// https://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
|
||||
/* divide q by 3 (equals multiplication by 0xf6) */
|
||||
q ^= q << 1
|
||||
q ^= q << 2
|
||||
q ^= q << 4
|
||||
if q&0x80 != 0 {
|
||||
q ^= 0x09
|
||||
}
|
||||
|
||||
// AES is based on the mathematical behavior of binary polynomials
|
||||
// (polynomials over GF(2)) modulo the irreducible polynomial x⁸ + x⁴ + x³ + x + 1.
|
||||
// Addition of these binary polynomials corresponds to binary xor.
|
||||
// Reducing mod poly corresponds to binary xor with poly every
|
||||
// time a 0x100 bit appears.
|
||||
const poly = 1<<8 | 1<<4 | 1<<3 | 1<<1 | 1<<0 // x⁸ + x⁴ + x³ + x + 1
|
||||
/* compute the affine transformation */
|
||||
xformed := q ^ bits.RotateLeft8(q, 1) ^ bits.RotateLeft8(q, 2) ^ bits.RotateLeft8(q, 3) ^ bits.RotateLeft8(q, 4)
|
||||
sbox[p] = xformed ^ 0x63
|
||||
|
||||
// Powers of x mod poly in GF(2).
|
||||
var powx = [16]byte{
|
||||
0x01,
|
||||
0x02,
|
||||
0x04,
|
||||
0x08,
|
||||
0x10,
|
||||
0x20,
|
||||
0x40,
|
||||
0x80,
|
||||
0x1b,
|
||||
0x36,
|
||||
0x6c,
|
||||
0xd8,
|
||||
0xab,
|
||||
0x4d,
|
||||
0x9a,
|
||||
0x2f,
|
||||
}
|
||||
if p == 1 {
|
||||
break
|
||||
}
|
||||
}
|
||||
|
||||
// FIPS-197 Figure 7. S-box substitution values in hexadecimal format.
|
||||
var sbox0 = [256]byte{
|
||||
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,
|
||||
}
|
||||
/* 0 is a special case since it has no inverse */
|
||||
sbox[0] = 0x63
|
||||
return sbox
|
||||
}()
|
||||
|
||||
// FIPS-197 Figure 14. Inverse S-box substitution values in hexadecimal format.
|
||||
var sbox1 = [256]byte{
|
||||
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,
|
||||
}
|
||||
// sbox1 FIPS-197 Figure 14. Inverse S-box substitution values generation
|
||||
var sbox1 = func() (isbox [256]byte) {
|
||||
for i := range sbox0 {
|
||||
isbox[i] = uint8(bytes.IndexByte(sbox0[:], uint8(i)))
|
||||
}
|
||||
return isbox
|
||||
}()
|
||||
|
||||
// Lookup tables for encryption.
|
||||
// encLut Lookup tables for encryption.
|
||||
var encLut = func() (te [4][256]uint32) {
|
||||
for i := 0; i < 256; i++ {
|
||||
s := uint32(sbox0[i])
|
||||
|
|
@ -127,7 +109,7 @@ var encLut = func() (te [4][256]uint32) {
|
|||
return te
|
||||
}()
|
||||
|
||||
// Lookup tables for decryption.
|
||||
// decLut Lookup tables for decryption.
|
||||
var decLut = func() (td [4][256]uint32) {
|
||||
for i := 0; i < 256; i++ {
|
||||
s := uint32(sbox1[i])
|
||||
|
|
|
|||
Loading…
Reference in a new issue