/
aeslight.go
246 lines (211 loc) · 11.3 KB
/
aeslight.go
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/*
AES_128_Transform
Based on code from rijndael-alg-fst (see below and aeslight.c.source),
transpiled by c2go version: v0.25.2 Dubnium 2018-06-29
If you have found any issues, please raise an issue at:
https://github.com/elliotchance/c2go/
*/
package smartcrypto
import (
"unsafe"
)
type u8 uint8
type u32 uint32
var rcon = []u32{
0x01000000, 0x02000000, 0x04000000, 0x08000000,
0x10000000, 0x20000000, 0x40000000, 0x80000000,
0x1B000000, 0x36000000,
// for 128-bit blocks, Rijndael never uses more than 10 rcon values
}
/**
* rijndael-alg-fst.h
*
* @version 3.0 (December 2000)
*
* Optimised ANSI C code for the Rijndael cipher (now AES)
*
* @author Vincent Rijmen <vincent.rijmen@esat.kuleuven.ac.be>
* @author Antoon Bosselaers <antoon.bosselaers@esat.kuleuven.ac.be>
* @author Paulo Barreto <paulo.barreto@terra.com.br>
*
* This code is hereby placed in the public domain.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ''AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
func getu32(data *u8) u32 {
return u32(u8(*(data)))<<24 ^
u32(u8(*((*u8)(unsafe.Pointer(uintptr(unsafe.Pointer((data))) + 1)))))<<16 ^
u32(u8(*((*u8)(unsafe.Pointer(uintptr(unsafe.Pointer((data))) + 2)))))<<8 ^
u32(u8(*((*u8)(unsafe.Pointer(uintptr(unsafe.Pointer((data))) + 3)))))
}
func putu32(data *u8, n u32) {
*(data) = u8(n >> 24)
*((*u8)(unsafe.Pointer(uintptr(unsafe.Pointer(data)) + 1))) = u8(n >> 16)
*((*u8)(unsafe.Pointer(uintptr(unsafe.Pointer(data)) + 2))) = u8(n >> 8)
*((*u8)(unsafe.Pointer(uintptr(unsafe.Pointer(data)) + 3))) = u8(n)
}
/**
* Expand the cipher key into the encryption key schedule.
* Code transpiled by c2go, and cleaned up (Mikael).
*
* @return the number of rounds for the given cipher key size.
*/
func rijndaelKeySetupEncTransform(nr int, rk *u32, cipherKey *u8) int {
var temp u32
var pData unsafe.Pointer
//rk[0] = GETU32(cipherKey );
*rk = getu32(cipherKey)
//rk[1] = GETU32(cipherKey + 4);
pData = unsafe.Pointer(uintptr(unsafe.Pointer(cipherKey)) + 1*4)
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 1*4))) = getu32((*u8)(pData))
//rk[2] = GETU32(cipherKey + 8);
pData = unsafe.Pointer(uintptr(unsafe.Pointer(cipherKey)) + 2*4)
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 2*4))) = getu32((*u8)(pData))
//rk[3] = GETU32(cipherKey + 12);
pData = unsafe.Pointer(uintptr(unsafe.Pointer(cipherKey)) + 3*4)
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 3*4))) = getu32((*u8)(pData))
pTe4 := &te4[0]
pRcon := &rcon[0]
i := 0
for {
temp = *((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 3*4)))
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 4*4))) = *rk ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(pTe4)) + (uintptr)(int32(temp>>16&0xff))*4)))&u32(0xff000000) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(pTe4)) + (uintptr)(int32(temp>>8&0xff))*4)))&u32(0xff0000) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(pTe4)) + (uintptr)(int32(temp&0xff))*4)))&u32(0xff00) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(pTe4)) + (uintptr)(int32(temp>>24))*4)))&u32(0xff) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(pRcon)) + (uintptr)(i)*4)))
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 5*4))) = *((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 1*4))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 4*4)))
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 6*4))) = *((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 2*4))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 5*4)))
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 7*4))) = *((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 3*4))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 6*4)))
i++
if i == nr {
return nr
}
rk = ((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + (uintptr)(4*4))))
}
}
/*
* Code transpiled by c2go, and cleaned up (Mikael).
* Modified, usable for nr = 3 only.
*/
func rijndaelEncrypt3(rk *u32, pt *u8, ct *u8) {
const nr = 3
var s0 u32
var s1 u32
var s2 u32
var s3 u32
var t0 u32
var t1 u32
var t2 u32
var t3 u32
var pData unsafe.Pointer
// Init
// s0 = GETU32(pt ) ^ rk[0];
s0 = getu32(pt) ^ *rk
// s1 = GETU32(pt + 4) ^ rk[1];
pData = unsafe.Pointer(uintptr(unsafe.Pointer(pt)) + 1*4)
s1 = getu32((*u8)(pData)) ^ *((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 1*4)))
// s2 = GETU32(pt + 8) ^ rk[2];
pData = unsafe.Pointer(uintptr(unsafe.Pointer(pt)) + 2*4)
s2 = getu32((*u8)(pData)) ^ *((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 2*4)))
// s3 = GETU32(pt + 12) ^ rk[3];
pData = unsafe.Pointer(uintptr(unsafe.Pointer(pt)) + 3*4)
s3 = getu32((*u8)(pData)) ^ *((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 3*4)))
// Round 1
t0 = *((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te0[0])) + (uintptr)((s0>>24)*4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te1[0])) + (uintptr((s1>>16)&0xff) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te2[0])) + (uintptr((s2>>8)&0xff) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te3[0])) + (uintptr((s3 & 0xff)) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 4*4)))
t1 = *((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te0[0])) + (uintptr)((s1>>24)*4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te1[0])) + (uintptr((s2>>16)&0xff) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te2[0])) + (uintptr((s3>>8)&0xff) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te3[0])) + (uintptr((s0 & 0xff)) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 5*4)))
t2 = *((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te0[0])) + (uintptr)((s2>>24)*4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te1[0])) + (uintptr((s3>>16)&0xff) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te2[0])) + (uintptr((s0>>8)&0xff) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te3[0])) + (uintptr((s1 & 0xff)) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 6*4)))
t3 = *((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te0[0])) + (uintptr)((s3>>24)*4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te1[0])) + (uintptr((s0>>16)&0xff) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te2[0])) + (uintptr((s1>>8)&0xff) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te3[0])) + (uintptr((s2 & 0xff)) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 7*4)))
// Round 2
s0 = *((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te0[0])) + (uintptr)((t0>>24)*4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te1[0])) + (uintptr((t1>>16)&0xff) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te2[0])) + (uintptr((t2>>8)&0xff) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te3[0])) + (uintptr((t3 & 0xff)) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 8*4)))
s1 = *((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te0[0])) + (uintptr)((t1>>24)*4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te1[0])) + (uintptr((t2>>16)&0xff) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te2[0])) + (uintptr((t3>>8)&0xff) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te3[0])) + (uintptr((t0 & 0xff)) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 9*4)))
s2 = *((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te0[0])) + (uintptr)((t2>>24)*4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te1[0])) + (uintptr((t3>>16)&0xff) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te2[0])) + (uintptr((t0>>8)&0xff) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te3[0])) + (uintptr((t1 & 0xff)) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 10*4)))
s3 = *((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te0[0])) + (uintptr)((t3>>24)*4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te1[0])) + (uintptr((t0>>16)&0xff) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te2[0])) + (uintptr((t1>>8)&0xff) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te3[0])) + (uintptr((t2 & 0xff)) * 4)))) ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 11*4)))
rk = ((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + (uintptr)(nr<<2)*4)))
if nr == 3 { // (always)
var pCt *u8
// Round 3
t0 = *((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te4[0])) + (uintptr)((s0>>24)*4))))&0xff000000 ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te4[0])) + (uintptr)(((s1>>16)&0xff)*4))))&0xff0000 ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te4[0])) + (uintptr)(((s2>>8)&0xff)*4))))&0xff00 ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te4[0])) + (uintptr)((s3&0xff)*4))))&0xff ^
*rk
putu32(ct, t0)
t1 = *((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te4[0])) + (uintptr)((s1>>24)*4))))&0xff000000 ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te4[0])) + (uintptr)(((s2>>16)&0xff)*4))))&0xff0000 ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te4[0])) + (uintptr)(((s3>>8)&0xff)*4))))&0xff00 ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te4[0])) + (uintptr)((s0&0xff)*4))))&0xff ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 1*4)))
pCt = (*u8)(unsafe.Pointer(uintptr(unsafe.Pointer(ct)) + 1*4))
putu32(pCt, t1)
t2 = *((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te4[0])) + (uintptr)((s2>>24)*4))))&0xff000000 ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te4[0])) + (uintptr)(((s3>>16)&0xff)*4))))&0xff0000 ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te4[0])) + (uintptr)(((s0>>8)&0xff)*4))))&0xff00 ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te4[0])) + (uintptr)((s1&0xff)*4))))&0xff ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 2*4)))
pCt = (*u8)(unsafe.Pointer(uintptr(unsafe.Pointer(ct)) + 2*4))
putu32(pCt, t2)
t3 = *((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te4[0])) + (uintptr)((s3>>24)*4))))&0xff000000 ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te4[0])) + (uintptr)(((s0>>16)&0xff)*4))))&0xff0000 ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te4[0])) + (uintptr)(((s1>>8)&0xff)*4))))&0xff00 ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(&te4[0])) + (uintptr)((s2&0xff)*4))))&0xff ^
*((*u32)(unsafe.Pointer(uintptr(unsafe.Pointer(rk)) + 3*4)))
pCt = (*u8)(unsafe.Pointer(uintptr(unsafe.Pointer(ct)) + 3*4))
putu32(pCt, t3)
}
}
func aes128transform(nr int, key *uint8, plainText *uint8, cipherText *uint8) {
const aes128rounds = 10
rk := make([]u32, 4*(aes128rounds+1))
rijndaelKeySetupEncTransform(nr, &rk[0], (*u8)(unsafe.Pointer(key)))
rijndaelEncrypt3(&rk[0], (*u8)(unsafe.Pointer(plainText)), (*u8)(unsafe.Pointer(cipherText)))
for i := range rk {
rk[i] = 0
}
}