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zuc: optimize function call

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Sun Yimin 2022-06-23 15:53:24 +08:00 committed by GitHub
parent b4b9cd07d9
commit 68f38a96af
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 27 additions and 25 deletions
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36
zuc/core.go
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@ -76,15 +76,17 @@ type zucState32 struct {
lfsr [16]uint32 // linear feedback shift register
r1 uint32
r2 uint32
x0 uint32 // Output X0 of the bit reorganization
x1 uint32 // Output X1 of the bit reorganization
x2 uint32 // Output X2 of the bit reorganization
x3 uint32 // Output X3 of the bit reorganization
}
func (s *zucState32) bitReconstruction() []uint32 {
result := make([]uint32, 4)
result[0] = ((s.lfsr[15] & 0x7FFF8000) << 1) | (s.lfsr[14] & 0xFFFF)
result[1] = ((s.lfsr[11] & 0xFFFF) << 16) | (s.lfsr[9] >> 15)
result[2] = ((s.lfsr[7] & 0xFFFF) << 16) | (s.lfsr[5] >> 15)
result[3] = ((s.lfsr[2] & 0xFFFF) << 16) | (s.lfsr[0] >> 15)
return result
func (s *zucState32) bitReorganization() {
s.x0 = ((s.lfsr[15] & 0x7FFF8000) << 1) | (s.lfsr[14] & 0xFFFF)
s.x1 = ((s.lfsr[11] & 0xFFFF) << 16) | (s.lfsr[9] >> 15)
s.x2 = ((s.lfsr[7] & 0xFFFF) << 16) | (s.lfsr[5] >> 15)
s.x3 = ((s.lfsr[2] & 0xFFFF) << 16) | (s.lfsr[0] >> 15)
}
func l1(x uint32) uint32 {
@ -95,10 +97,10 @@ func l2(x uint32) uint32 {
return x ^ bits.RotateLeft32(x, 8) ^ bits.RotateLeft32(x, 14) ^ bits.RotateLeft32(x, 22) ^ bits.RotateLeft32(x, 30)
}
func (s *zucState32) f32(x0, x1, x2 uint32) uint32 {
w := s.r1 ^ x0 + s.r2
w1 := s.r1 + x1
w2 := s.r2 ^ x2
func (s *zucState32) f32() uint32 {
w := s.r1 ^ s.x0 + s.r2
w1 := s.r1 + s.x1
w2 := s.r2 ^ s.x2
u := l1((w1 << 16) | (w2 >> 16))
v := l2((w2 << 16) | (w1 >> 16))
s.r1 = binary.BigEndian.Uint32([]byte{sbox0[u>>24], sbox1[(u>>16)&0xFF], sbox0[(u>>8)&0xFF], sbox1[u&0xFF]})
@ -204,21 +206,21 @@ func newZUCState(key, iv []byte) (*zucState32, error) {
// initialization
for i := 0; i < 32; i++ {
x := state.bitReconstruction()
w := state.f32(x[0], x[1], x[2])
state.bitReorganization()
w := state.f32()
state.enterInitMode(w >> 1)
}
// work state
x := state.bitReconstruction()
state.f32(x[0], x[1], x[2])
state.bitReorganization()
state.f32()
state.enterWorkMode()
return state, nil
}
func (s *zucState32) genKeyword() uint32 {
x := s.bitReconstruction()
z := x[3] ^ s.f32(x[0], x[1], x[2])
s.bitReorganization()
z := s.x3 ^ s.f32()
s.enterWorkMode()
return z
}

8
zuc/eia.go
View File

@ -40,14 +40,14 @@ func NewHash(key, iv []byte) (*ZUC128Mac, error) {
}
// initialization
for i := 0; i < 32; i++ {
x := mac.bitReconstruction()
w := mac.f32(x[0], x[1], x[2])
mac.bitReorganization()
w := mac.f32()
mac.enterInitMode(w >> 1)
}
// work state
x := mac.bitReconstruction()
mac.f32(x[0], x[1], x[2])
mac.bitReorganization()
mac.f32()
mac.enterWorkMode()
mac.initState.r1 = mac.r1

8
zuc/eia256.go
View File

@ -48,14 +48,14 @@ func NewHash256(key, iv []byte, tagSize int) (*ZUC256Mac, error) {
}
// initialization
for i := 0; i < 32; i++ {
x := mac.bitReconstruction()
w := mac.f32(x[0], x[1], x[2])
mac.bitReorganization()
w := mac.f32()
mac.enterInitMode(w >> 1)
}
// work state
x := mac.bitReconstruction()
mac.f32(x[0], x[1], x[2])
mac.bitReorganization()
mac.f32()
mac.enterWorkMode()
mac.initState.r1 = mac.r1