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block.go
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package seed
// Common functions
func getB0(a uint32) uint32 { return 0x000000ff & (a) }
func getB1(a uint32) uint32 { return 0x000000ff & (a >> 8) }
func getB2(a uint32) uint32 { return 0x000000ff & (a >> 16) }
func getB3(a uint32) uint32 { return 0x000000ff & (a >> 24) }
// SEED round function
func seedRound(l0, l1, r0, r1, k *[]uint32) {
var t0, t1 uint32
var t00, t11 uint64
// F-function
t0 = (*r0)[0] ^ (*k)[0]
t1 = (*r1)[0] ^ (*k)[1]
t1 ^= t0
if t0 < 0 {
t00 = uint64(t0&0x7fffffff | 0x80000000)
} else {
t00 = uint64(t0)
}
t1 = ss0[getB0(t1)] ^ ss1[getB1(t1)] ^ ss2[getB2(t1)] ^ ss3[getB3(t1)]
if t1 < 0 {
t11 = uint64(t1&0x7fffffff | 0x80000000)
} else {
t11 = uint64(t1)
}
t00 += t11
t0 = ss0[getB0(uint32(t00))] ^ ss1[getB1(uint32(t00))] ^ ss2[getB2(uint32(t00))] ^ ss3[getB3(uint32(t00))]
if t0 < 0 {
t00 = uint64(t0&0x7fffffff | 0x80000000)
} else {
t00 = uint64(t0)
}
t11 += t00
t1 = ss0[getB0(uint32(t11))] ^ ss1[getB1(uint32(t11))] ^ ss2[getB2(uint32(t11))] ^ ss3[getB3(uint32(t11))]
if t1 < 0 {
t11 = uint64(t1&0x7fffffff | 0x80000000)
} else {
t11 = uint64(t1)
}
t00 += t11
// output of F function is added to left-side variable
(*l0)[0] ^= uint32(t00)
(*l1)[0] ^= uint32(t11)
}
func seedEncrypt(pdwRoundKey []uint32, dst, src []byte) {
l0, l1, r0, r1 := []uint32{0x0}, []uint32{0x0}, []uint32{0x0}, []uint32{0x0}
k := make([]uint32, 2)
nCount := 0
// Set up input values for encryption
l0[0] = (uint32(src[0]) & 0x000000ff)
l0[0] = ((l0[0]) << 8) ^ (uint32(src[1]) & 0x000000ff)
l0[0] = ((l0[0]) << 8) ^ (uint32(src[2]) & 0x000000ff)
l0[0] = ((l0[0]) << 8) ^ (uint32(src[3]) & 0x000000ff)
l1[0] = (uint32(src[4]) & 0x000000ff)
l1[0] = ((l1[0]) << 8) ^ (uint32(src[5]) & 0x000000ff)
l1[0] = ((l1[0]) << 8) ^ (uint32(src[6]) & 0x000000ff)
l1[0] = ((l1[0]) << 8) ^ (uint32(src[7]) & 0x000000ff)
r0[0] = (uint32(src[8]) & 0x000000ff)
r0[0] = ((r0[0]) << 8) ^ (uint32(src[9]) & 0x000000ff)
r0[0] = ((r0[0]) << 8) ^ (uint32(src[10]) & 0x000000ff)
r0[0] = ((r0[0]) << 8) ^ (uint32(src[11]) & 0x000000ff)
r1[0] = (uint32(src[12]) & 0x000000ff)
r1[0] = ((r1[0]) << 8) ^ (uint32(src[13]) & 0x000000ff)
r1[0] = ((r1[0]) << 8) ^ (uint32(src[14]) & 0x000000ff)
r1[0] = ((r1[0]) << 8) ^ (uint32(src[15]) & 0x000000ff)
k[0] = pdwRoundKey[nCount]
nCount++
k[1] = pdwRoundKey[nCount]
nCount++
seedRound(&l0, &l1, &r0, &r1, &k) // 1
k[0] = pdwRoundKey[nCount]
nCount++
k[1] = pdwRoundKey[nCount]
nCount++
seedRound(&r0, &r1, &l0, &l1, &k) // 2
k[0] = pdwRoundKey[nCount]
nCount++
k[1] = pdwRoundKey[nCount]
nCount++
seedRound(&l0, &l1, &r0, &r1, &k) // 3
k[0] = pdwRoundKey[nCount]
nCount++
k[1] = pdwRoundKey[nCount]
nCount++
seedRound(&r0, &r1, &l0, &l1, &k) // 4
k[0] = pdwRoundKey[nCount]
nCount++
k[1] = pdwRoundKey[nCount]
nCount++
seedRound(&l0, &l1, &r0, &r1, &k) // 5
k[0] = pdwRoundKey[nCount]
nCount++
k[1] = pdwRoundKey[nCount]
nCount++
seedRound(&r0, &r1, &l0, &l1, &k) // 6
k[0] = pdwRoundKey[nCount]
nCount++
k[1] = pdwRoundKey[nCount]
nCount++
seedRound(&l0, &l1, &r0, &r1, &k) // 7
k[0] = pdwRoundKey[nCount]
nCount++
k[1] = pdwRoundKey[nCount]
nCount++
seedRound(&r0, &r1, &l0, &l1, &k) // 8
k[0] = pdwRoundKey[nCount]
nCount++
k[1] = pdwRoundKey[nCount]
nCount++
seedRound(&l0, &l1, &r0, &r1, &k) // 9
k[0] = pdwRoundKey[nCount]
nCount++
k[1] = pdwRoundKey[nCount]
nCount++
seedRound(&r0, &r1, &l0, &l1, &k) // 10
k[0] = pdwRoundKey[nCount]
nCount++
k[1] = pdwRoundKey[nCount]
nCount++
seedRound(&l0, &l1, &r0, &r1, &k) // 11
k[0] = pdwRoundKey[nCount]
nCount++
k[1] = pdwRoundKey[nCount]
nCount++
seedRound(&r0, &r1, &l0, &l1, &k) // 12
k[0] = pdwRoundKey[nCount]
nCount++
k[1] = pdwRoundKey[nCount]
nCount++
seedRound(&l0, &l1, &r0, &r1, &k) // 13
k[0] = pdwRoundKey[nCount]
nCount++
k[1] = pdwRoundKey[nCount]
nCount++
seedRound(&r0, &r1, &l0, &l1, &k) // 14
k[0] = pdwRoundKey[nCount]
nCount++
k[1] = pdwRoundKey[nCount]
nCount++
seedRound(&l0, &l1, &r0, &r1, &k) // 15
k[0] = pdwRoundKey[nCount]
nCount++
k[1] = pdwRoundKey[nCount]
seedRound(&r0, &r1, &l0, &l1, &k) // 16
// Copying output values from last round to outData
for i := 0; i < 4; i++ {
dst[i] = byte((r0[0] >> uint32(8*(3-i))) & 0xff)
dst[4+i] = byte((r1[0] >> uint32(8*(3-i))) & 0xff)
dst[8+i] = byte((l0[0] >> uint32(8*(3-i))) & 0xff)
dst[12+i] = byte((l1[0] >> uint32(8*(3-i))) & 0xff)
}
return
}
// Same as encrypt, except that round keys are applied in reverse order
func seedDecrypt(pdwRoundKey []uint32, dst []byte, src []byte) {
l0, l1, r0, r1 := []uint32{0x0}, []uint32{0x0}, []uint32{0x0}, []uint32{0x0}
k := make([]uint32, 2)
nCount := 31
// Set up input values for decryption
l0[0] = (uint32(src[0]) & 0x000000ff)
l0[0] = ((l0[0]) << 8) ^ (uint32(src[1]) & 0x000000ff)
l0[0] = ((l0[0]) << 8) ^ (uint32(src[2]) & 0x000000ff)
l0[0] = ((l0[0]) << 8) ^ (uint32(src[3]) & 0x000000ff)
l1[0] = (uint32(src[4]) & 0x000000ff)
l1[0] = ((l1[0]) << 8) ^ (uint32(src[5]) & 0x000000ff)
l1[0] = ((l1[0]) << 8) ^ (uint32(src[6]) & 0x000000ff)
l1[0] = ((l1[0]) << 8) ^ (uint32(src[7]) & 0x000000ff)
r0[0] = (uint32(src[8]) & 0x000000ff)
r0[0] = ((r0[0]) << 8) ^ (uint32(src[9]) & 0x000000ff)
r0[0] = ((r0[0]) << 8) ^ (uint32(src[10]) & 0x000000ff)
r0[0] = ((r0[0]) << 8) ^ (uint32(src[11]) & 0x000000ff)
r1[0] = (uint32(src[12]) & 0x000000ff)
r1[0] = ((r1[0]) << 8) ^ (uint32(src[13]) & 0x000000ff)
r1[0] = ((r1[0]) << 8) ^ (uint32(src[14]) & 0x000000ff)
r1[0] = ((r1[0]) << 8) ^ (uint32(src[15]) & 0x000000ff)
k[1] = pdwRoundKey[nCount]
nCount--
k[0] = pdwRoundKey[nCount]
nCount--
seedRound(&l0, &l1, &r0, &r1, &k) // 1
k[1] = pdwRoundKey[nCount]
nCount--
k[0] = pdwRoundKey[nCount]
nCount--
seedRound(&r0, &r1, &l0, &l1, &k) // 2
k[1] = pdwRoundKey[nCount]
nCount--
k[0] = pdwRoundKey[nCount]
nCount--
seedRound(&l0, &l1, &r0, &r1, &k) // 3
k[1] = pdwRoundKey[nCount]
nCount--
k[0] = pdwRoundKey[nCount]
nCount--
seedRound(&r0, &r1, &l0, &l1, &k) // 4
k[1] = pdwRoundKey[nCount]
nCount--
k[0] = pdwRoundKey[nCount]
nCount--
seedRound(&l0, &l1, &r0, &r1, &k) // 5
k[1] = pdwRoundKey[nCount]
nCount--
k[0] = pdwRoundKey[nCount]
nCount--
seedRound(&r0, &r1, &l0, &l1, &k) // 6
k[1] = pdwRoundKey[nCount]
nCount--
k[0] = pdwRoundKey[nCount]
nCount--
seedRound(&l0, &l1, &r0, &r1, &k) // 7
k[1] = pdwRoundKey[nCount]
nCount--
k[0] = pdwRoundKey[nCount]
nCount--
seedRound(&r0, &r1, &l0, &l1, &k) // 8
k[1] = pdwRoundKey[nCount]
nCount--
k[0] = pdwRoundKey[nCount]
nCount--
seedRound(&l0, &l1, &r0, &r1, &k) // 9
k[1] = pdwRoundKey[nCount]
nCount--
k[0] = pdwRoundKey[nCount]
nCount--
seedRound(&r0, &r1, &l0, &l1, &k) // 10
k[1] = pdwRoundKey[nCount]
nCount--
k[0] = pdwRoundKey[nCount]
nCount--
seedRound(&l0, &l1, &r0, &r1, &k) // 11
k[1] = pdwRoundKey[nCount]
nCount--
k[0] = pdwRoundKey[nCount]
nCount--
seedRound(&r0, &r1, &l0, &l1, &k) // 12
k[1] = pdwRoundKey[nCount]
nCount--
k[0] = pdwRoundKey[nCount]
nCount--
seedRound(&l0, &l1, &r0, &r1, &k) // 13
k[1] = pdwRoundKey[nCount]
nCount--
k[0] = pdwRoundKey[nCount]
nCount--
seedRound(&r0, &r1, &l0, &l1, &k) // 14
k[1] = pdwRoundKey[nCount]
nCount--
k[0] = pdwRoundKey[nCount]
nCount--
seedRound(&l0, &l1, &r0, &r1, &k) // 15
k[1] = pdwRoundKey[nCount]
nCount--
k[0] = pdwRoundKey[nCount]
seedRound(&r0, &r1, &l0, &l1, &k) // 16
// Copy output values from last round to outData
for i := 0; i < 4; i++ {
dst[i] = byte((r0[0] >> uint32(8*(3-i))) & 0xff)
dst[4+i] = byte((r1[0] >> uint32(8*(3-i))) & 0xff)
dst[8+i] = byte((l0[0] >> uint32(8*(3-i))) & 0xff)
dst[12+i] = byte((l1[0] >> uint32(8*(3-i))) & 0xff)
}
return
}
// Functions for Key schedule
func encRoundKeyUpdate0(k, a, b, c, d *[]uint32, z int) {
var t0, _, t00, t11 uint32
t0 = (*a)[0]
(*a)[0] = ((((*a)[0]) >> 8) & 0x00ffffff) ^ ((*b)[0] << 24)
(*b)[0] = ((((*b)[0]) >> 8) & 0x00ffffff) ^ (t0 << 24)
t00 = ((*a)[0]) + ((*c)[0]) - (kc[z])
t11 = ((*b)[0]) + (kc[z]) - ((*d)[0])
(*k)[0] = ss0[getB0(uint32(t00))] ^ ss1[getB1(uint32(t00))] ^ ss2[getB2(uint32(t00))] ^ ss3[getB3(uint32(t00))]
(*k)[1] = ss0[getB0(uint32(t11))] ^ ss1[getB1(uint32(t11))] ^ ss2[getB2(uint32(t11))] ^ ss3[getB3(uint32(t11))]
}
func encRoundKeyUpdate1(k, a, b, c, d *[]uint32, z int) {
var t0, _, t00, t11 uint32
t0 = (*c)[0]
(*c)[0] = (((*c)[0]) << 8) ^ ((((*d)[0]) >> 24) & 0x000000ff)
(*d)[0] = (((*d)[0]) << 8) ^ ((t0 >> 24) & 0x000000ff)
t00 = ((*a)[0]) + ((*c)[0]) - (kc[z])
t11 = ((*b)[0]) + (kc[z]) - ((*d)[0])
(*k)[0] = ss0[getB0(uint32(t00))] ^ ss1[getB1(uint32(t00))] ^ ss2[getB2(uint32(t00))] ^ ss3[getB3(uint32(t00))]
(*k)[1] = ss0[getB0(uint32(t11))] ^ ss1[getB1(uint32(t11))] ^ ss2[getB2(uint32(t11))] ^ ss3[getB3(uint32(t11))]
}
// Key Schedule
func seedRoundKey(pbUserKey []byte) []uint32 {
a, b, c, d, k := make([]uint32, 1), make([]uint32, 1), make([]uint32, 1), make([]uint32, 1), make([]uint32, 2)
var t0, t1 uint32
nCount := 2
// Set up input values for Key Schedule
a[0] = (uint32(pbUserKey[0]) & 0x000000ff)
a[0] = (a[0] << 8) ^ (uint32(pbUserKey[1]) & 0x000000ff)
a[0] = (a[0] << 8) ^ (uint32(pbUserKey[2]) & 0x000000ff)
a[0] = (a[0] << 8) ^ (uint32(pbUserKey[3]) & 0x000000ff)
b[0] = (uint32(pbUserKey[4]) & 0x000000ff)
b[0] = (b[0] << 8) ^ (uint32(pbUserKey[5]) & 0x000000ff)
b[0] = (b[0] << 8) ^ (uint32(pbUserKey[6]) & 0x000000ff)
b[0] = (b[0] << 8) ^ (uint32(pbUserKey[7]) & 0x000000ff)
c[0] = (uint32(pbUserKey[8]) & 0x000000ff)
c[0] = (c[0] << 8) ^ (uint32(pbUserKey[9]) & 0x000000ff)
c[0] = (c[0] << 8) ^ (uint32(pbUserKey[10]) & 0x000000ff)
c[0] = (c[0] << 8) ^ (uint32(pbUserKey[11]) & 0x000000ff)
d[0] = (uint32(pbUserKey[12]) & 0x000000ff)
d[0] = (d[0] << 8) ^ (uint32(pbUserKey[13]) & 0x000000ff)
d[0] = (d[0] << 8) ^ (uint32(pbUserKey[14]) & 0x000000ff)
d[0] = (d[0] << 8) ^ (uint32(pbUserKey[15]) & 0x000000ff)
t0 = (a[0]) + (c[0]) - (kc[0])
t1 = (b[0]) - (d[0]) + (kc[0])
pdwRoundKey := make([]uint32, 32)
pdwRoundKey[0] = ss0[getB0(uint32(t0))] ^ ss1[getB1(uint32(t0))] ^ ss2[getB2(uint32(t0))] ^ ss3[getB3(uint32(t0))]
pdwRoundKey[1] = ss0[getB0(uint32(t1))] ^ ss1[getB1(uint32(t1))] ^ ss2[getB2(uint32(t1))] ^ ss3[getB3(uint32(t1))]
encRoundKeyUpdate0(&k, &a, &b, &c, &d, 1)
pdwRoundKey[nCount] = k[0]
nCount++
pdwRoundKey[nCount] = k[1]
nCount++
encRoundKeyUpdate1(&k, &a, &b, &c, &d, 2)
pdwRoundKey[nCount] = k[0]
nCount++
pdwRoundKey[nCount] = k[1]
nCount++
encRoundKeyUpdate0(&k, &a, &b, &c, &d, 3)
pdwRoundKey[nCount] = k[0]
nCount++
pdwRoundKey[nCount] = k[1]
nCount++
encRoundKeyUpdate1(&k, &a, &b, &c, &d, 4)
pdwRoundKey[nCount] = k[0]
nCount++
pdwRoundKey[nCount] = k[1]
nCount++
encRoundKeyUpdate0(&k, &a, &b, &c, &d, 5)
pdwRoundKey[nCount] = k[0]
nCount++
pdwRoundKey[nCount] = k[1]
nCount++
encRoundKeyUpdate1(&k, &a, &b, &c, &d, 6)
pdwRoundKey[nCount] = k[0]
nCount++
pdwRoundKey[nCount] = k[1]
nCount++
encRoundKeyUpdate0(&k, &a, &b, &c, &d, 7)
pdwRoundKey[nCount] = k[0]
nCount++
pdwRoundKey[nCount] = k[1]
nCount++
encRoundKeyUpdate1(&k, &a, &b, &c, &d, 8)
pdwRoundKey[nCount] = k[0]
nCount++
pdwRoundKey[nCount] = k[1]
nCount++
encRoundKeyUpdate0(&k, &a, &b, &c, &d, 9)
pdwRoundKey[nCount] = k[0]
nCount++
pdwRoundKey[nCount] = k[1]
nCount++
encRoundKeyUpdate1(&k, &a, &b, &c, &d, 10)
pdwRoundKey[nCount] = k[0]
nCount++
pdwRoundKey[nCount] = k[1]
nCount++
encRoundKeyUpdate0(&k, &a, &b, &c, &d, 11)
pdwRoundKey[nCount] = k[0]
nCount++
pdwRoundKey[nCount] = k[1]
nCount++
encRoundKeyUpdate1(&k, &a, &b, &c, &d, 12)
pdwRoundKey[nCount] = k[0]
nCount++
pdwRoundKey[nCount] = k[1]
nCount++
encRoundKeyUpdate0(&k, &a, &b, &c, &d, 13)
pdwRoundKey[nCount] = k[0]
nCount++
pdwRoundKey[nCount] = k[1]
nCount++
encRoundKeyUpdate1(&k, &a, &b, &c, &d, 14)
pdwRoundKey[nCount] = k[0]
nCount++
pdwRoundKey[nCount] = k[1]
nCount++
encRoundKeyUpdate0(&k, &a, &b, &c, &d, 15)
pdwRoundKey[nCount] = k[0]
nCount++
pdwRoundKey[nCount] = k[1]
return pdwRoundKey
}