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zuc 128 stream cipher
This commit is contained in:
Emman
parent
e95fc0c08a
commit
133077a4b2
150
zuc/core.go
Normal file
150
zuc/core.go
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package zuc
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import (
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"encoding/binary"
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"fmt"
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"math/bits"
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)
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// constant D
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var kd = [16]uint32{
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0x44D7, 0x26BC, 0x626B, 0x135E, 0x5789, 0x35E2, 0x7135, 0x09AF,
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0x4D78, 0x2F13, 0x6BC4, 0x1AF1, 0x5E26, 0x3C4D, 0x789A, 0x47AC,
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}
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var sbox0 = [256]byte{
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0x3e, 0x72, 0x5b, 0x47, 0xca, 0xe0, 0x00, 0x33, 0x04, 0xd1, 0x54, 0x98, 0x09, 0xb9, 0x6d, 0xcb,
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0x7b, 0x1b, 0xf9, 0x32, 0xaf, 0x9d, 0x6a, 0xa5, 0xb8, 0x2d, 0xfc, 0x1d, 0x08, 0x53, 0x03, 0x90,
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0x4d, 0x4e, 0x84, 0x99, 0xe4, 0xce, 0xd9, 0x91, 0xdd, 0xb6, 0x85, 0x48, 0x8b, 0x29, 0x6e, 0xac,
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0xcd, 0xc1, 0xf8, 0x1e, 0x73, 0x43, 0x69, 0xc6, 0xb5, 0xbd, 0xfd, 0x39, 0x63, 0x20, 0xd4, 0x38,
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0x76, 0x7d, 0xb2, 0xa7, 0xcf, 0xed, 0x57, 0xc5, 0xf3, 0x2c, 0xbb, 0x14, 0x21, 0x06, 0x55, 0x9b,
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0xe3, 0xef, 0x5e, 0x31, 0x4f, 0x7f, 0x5a, 0xa4, 0x0d, 0x82, 0x51, 0x49, 0x5f, 0xba, 0x58, 0x1c,
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0x4a, 0x16, 0xd5, 0x17, 0xa8, 0x92, 0x24, 0x1f, 0x8c, 0xff, 0xd8, 0xae, 0x2e, 0x01, 0xd3, 0xad,
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0x3b, 0x4b, 0xda, 0x46, 0xeb, 0xc9, 0xde, 0x9a, 0x8f, 0x87, 0xd7, 0x3a, 0x80, 0x6f, 0x2f, 0xc8,
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0xb1, 0xb4, 0x37, 0xf7, 0x0a, 0x22, 0x13, 0x28, 0x7c, 0xcc, 0x3c, 0x89, 0xc7, 0xc3, 0x96, 0x56,
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0x07, 0xbf, 0x7e, 0xf0, 0x0b, 0x2b, 0x97, 0x52, 0x35, 0x41, 0x79, 0x61, 0xa6, 0x4c, 0x10, 0xfe,
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0xbc, 0x26, 0x95, 0x88, 0x8a, 0xb0, 0xa3, 0xfb, 0xc0, 0x18, 0x94, 0xf2, 0xe1, 0xe5, 0xe9, 0x5d,
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0xd0, 0xdc, 0x11, 0x66, 0x64, 0x5c, 0xec, 0x59, 0x42, 0x75, 0x12, 0xf5, 0x74, 0x9c, 0xaa, 0x23,
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0x0e, 0x86, 0xab, 0xbe, 0x2a, 0x02, 0xe7, 0x67, 0xe6, 0x44, 0xa2, 0x6c, 0xc2, 0x93, 0x9f, 0xf1,
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0xf6, 0xfa, 0x36, 0xd2, 0x50, 0x68, 0x9e, 0x62, 0x71, 0x15, 0x3d, 0xd6, 0x40, 0xc4, 0xe2, 0x0f,
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0x8e, 0x83, 0x77, 0x6b, 0x25, 0x05, 0x3f, 0x0c, 0x30, 0xea, 0x70, 0xb7, 0xa1, 0xe8, 0xa9, 0x65,
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0x8d, 0x27, 0x1a, 0xdb, 0x81, 0xb3, 0xa0, 0xf4, 0x45, 0x7a, 0x19, 0xdf, 0xee, 0x78, 0x34, 0x60,
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}
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var sbox1 = [256]byte{
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0x55, 0xc2, 0x63, 0x71, 0x3b, 0xc8, 0x47, 0x86, 0x9f, 0x3c, 0xda, 0x5b, 0x29, 0xaa, 0xfd, 0x77,
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0x8c, 0xc5, 0x94, 0x0c, 0xa6, 0x1a, 0x13, 0x00, 0xe3, 0xa8, 0x16, 0x72, 0x40, 0xf9, 0xf8, 0x42,
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0x44, 0x26, 0x68, 0x96, 0x81, 0xd9, 0x45, 0x3e, 0x10, 0x76, 0xc6, 0xa7, 0x8b, 0x39, 0x43, 0xe1,
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0x3a, 0xb5, 0x56, 0x2a, 0xc0, 0x6d, 0xb3, 0x05, 0x22, 0x66, 0xbf, 0xdc, 0x0b, 0xfa, 0x62, 0x48,
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0xdd, 0x20, 0x11, 0x06, 0x36, 0xc9, 0xc1, 0xcf, 0xf6, 0x27, 0x52, 0xbb, 0x69, 0xf5, 0xd4, 0x87,
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0x7f, 0x84, 0x4c, 0xd2, 0x9c, 0x57, 0xa4, 0xbc, 0x4f, 0x9a, 0xdf, 0xfe, 0xd6, 0x8d, 0x7a, 0xeb,
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0x2b, 0x53, 0xd8, 0x5c, 0xa1, 0x14, 0x17, 0xfb, 0x23, 0xd5, 0x7d, 0x30, 0x67, 0x73, 0x08, 0x09,
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0xee, 0xb7, 0x70, 0x3f, 0x61, 0xb2, 0x19, 0x8e, 0x4e, 0xe5, 0x4b, 0x93, 0x8f, 0x5d, 0xdb, 0xa9,
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0xad, 0xf1, 0xae, 0x2e, 0xcb, 0x0d, 0xfc, 0xf4, 0x2d, 0x46, 0x6e, 0x1d, 0x97, 0xe8, 0xd1, 0xe9,
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0x4d, 0x37, 0xa5, 0x75, 0x5e, 0x83, 0x9e, 0xab, 0x82, 0x9d, 0xb9, 0x1c, 0xe0, 0xcd, 0x49, 0x89,
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0x01, 0xb6, 0xbd, 0x58, 0x24, 0xa2, 0x5f, 0x38, 0x78, 0x99, 0x15, 0x90, 0x50, 0xb8, 0x95, 0xe4,
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0xd0, 0x91, 0xc7, 0xce, 0xed, 0x0f, 0xb4, 0x6f, 0xa0, 0xcc, 0xf0, 0x02, 0x4a, 0x79, 0xc3, 0xde,
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0xa3, 0xef, 0xea, 0x51, 0xe6, 0x6b, 0x18, 0xec, 0x1b, 0x2c, 0x80, 0xf7, 0x74, 0xe7, 0xff, 0x21,
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0x5a, 0x6a, 0x54, 0x1e, 0x41, 0x31, 0x92, 0x35, 0xc4, 0x33, 0x07, 0x0a, 0xba, 0x7e, 0x0e, 0x34,
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0x88, 0xb1, 0x98, 0x7c, 0xf3, 0x3d, 0x60, 0x6c, 0x7b, 0xca, 0xd3, 0x1f, 0x32, 0x65, 0x04, 0x28,
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0x64, 0xbe, 0x85, 0x9b, 0x2f, 0x59, 0x8a, 0xd7, 0xb0, 0x25, 0xac, 0xaf, 0x12, 0x03, 0xe2, 0xf2,
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}
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type zucState32 struct {
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lfsr [16]uint32 // linear feedback shift register
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r1 uint32
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r2 uint32
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}
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func (s *zucState32) bitReconstruction() []uint32 {
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result := make([]uint32, 4)
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result[0] = ((s.lfsr[15] & 0x7FFF8000) << 1) | (s.lfsr[14] & 0xFFFF)
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result[1] = ((s.lfsr[11] & 0xFFFF) << 16) | (s.lfsr[9] >> 15)
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result[2] = ((s.lfsr[7] & 0xFFFF) << 16) | (s.lfsr[5] >> 15)
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result[3] = ((s.lfsr[2] & 0xFFFF) << 16) | (s.lfsr[0] >> 15)
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return result
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}
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func l1(x uint32) uint32 {
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return x ^ bits.RotateLeft32(x, 2) ^ bits.RotateLeft32(x, 10) ^ bits.RotateLeft32(x, 18) ^ bits.RotateLeft32(x, 24)
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}
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func l2(x uint32) uint32 {
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return x ^ bits.RotateLeft32(x, 8) ^ bits.RotateLeft32(x, 14) ^ bits.RotateLeft32(x, 22) ^ bits.RotateLeft32(x, 30)
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}
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func (s *zucState32) f32(x0, x1, x2 uint32) uint32 {
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w := s.r1 ^ x0 + s.r2
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w1 := s.r1 + x1
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w2 := s.r2 ^ x2
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u := l1((w1 << 16) | (w2 >> 16))
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v := l2((w2 << 16) | (w1 >> 16))
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s.r1 = binary.BigEndian.Uint32([]byte{sbox0[u>>24], sbox1[(u>>16)&0xFF], sbox0[(u>>8)&0xFF], sbox1[u&0xFF]})
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s.r2 = binary.BigEndian.Uint32([]byte{sbox0[v>>24], sbox1[(v>>16)&0xFF], sbox0[(v>>8)&0xFF], sbox1[v&0xFF]})
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return w
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}
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func rotateLeft31(x uint32, k int) uint32 {
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return (x<<k | x>>(31-k)) & 0x7FFFFFFF
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}
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func add31(x, y uint32) uint32 {
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resut := x + y
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return (resut & 0x7FFFFFFF) + (resut >> 31)
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}
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func (s *zucState32) enterInitMode(w uint32) {
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v := s.lfsr[0]
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v = add31(v, rotateLeft31(s.lfsr[0], 8))
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v = add31(v, rotateLeft31(s.lfsr[4], 20))
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v = add31(v, rotateLeft31(s.lfsr[10], 21))
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v = add31(v, rotateLeft31(s.lfsr[13], 17))
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v = add31(v, rotateLeft31(s.lfsr[15], 15))
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v = add31(v, w)
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if v == 0 {
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v = 0x7FFFFFFF
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}
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for i := 0; i < 15; i++ {
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s.lfsr[i] = s.lfsr[i+1]
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}
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s.lfsr[15] = v
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}
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func (s *zucState32) enterWorkMode() {
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s.enterInitMode(0)
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}
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func newZUCState(key, iv []byte) (*zucState32, error) {
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if len(key) != 16 {
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return nil, fmt.Errorf("zuc: invalid key size %d, expect 16 in bytes", len(key))
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}
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if len(iv) != 16 {
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return nil, fmt.Errorf("zuc: invalid iv size %d, expect 16 in bytes", len(iv))
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}
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state := &zucState32{}
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// loading key and iv
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for i := 0; i < 16; i++ {
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state.lfsr[i] = (uint32(key[i]) << 23) | (kd[i] << 8) | uint32(iv[i])
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}
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// initialization
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for i := 0; i < 32; i++ {
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x := state.bitReconstruction()
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w := state.f32(x[0], x[1], x[2])
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state.enterInitMode(w >> 1)
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}
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// work state
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x := state.bitReconstruction()
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state.f32(x[0], x[1], x[2])
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state.enterWorkMode()
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return state, nil
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}
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func (s *zucState32) genKeyword() uint32 {
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x := s.bitReconstruction()
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z := x[3] ^ s.f32(x[0], x[1], x[2])
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s.enterWorkMode()
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return z
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}
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41
zuc/core_test.go
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41
zuc/core_test.go
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@ -0,0 +1,41 @@
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package zuc
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import (
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"testing"
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)
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func Test_genKeyword_case1(t *testing.T) {
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s, _ := newZUCState([]byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0})
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z1 := s.genKeyword()
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if z1 != 0x27bede74 {
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t.Errorf("expected=%x, result=%x\n", 0x27bede74, z1)
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}
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z2 := s.genKeyword()
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if z2 != 0x018082da {
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t.Errorf("expected=%x, result=%x\n", 0x018082da, z2)
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}
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}
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func Test_genKeyword_case2(t *testing.T) {
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s, _ := newZUCState([]byte{255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, []byte{255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255})
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z1 := s.genKeyword()
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if z1 != 0x0657cfa0 {
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t.Errorf("expected=%x, result=%x\n", 0x0657cfa0, z1)
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}
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z2 := s.genKeyword()
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if z2 != 0x7096398b {
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t.Errorf("expected=%x, result=%x\n", 0x7096398b, z2)
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}
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}
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func Test_genKeyword_case3(t *testing.T) {
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s, _ := newZUCState([]byte{0x3d, 0x4c, 0x4b, 0xe9, 0x6a, 0x82, 0xfd, 0xae, 0xb5, 0x8f, 0x64, 0x1d, 0xb1, 0x7b, 0x45, 0x5b}, []byte{0x84, 0x31, 0x9a, 0xa8, 0xde, 0x69, 0x15, 0xca, 0x1f, 0x6b, 0xda, 0x6b, 0xfb, 0xd8, 0xc7, 0x66})
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z1 := s.genKeyword()
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if z1 != 0x14f1c272 {
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t.Errorf("expected=%x, result=%x\n", 0x14f1c272, z1)
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}
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z2 := s.genKeyword()
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if z2 != 0x3279c419 {
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t.Errorf("expected=%x, result=%x\n", 0x3279c419, z2)
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}
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}
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43
zuc/eea.go
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43
zuc/eea.go
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package zuc
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import (
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"crypto/cipher"
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"encoding/binary"
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"github.com/emmansun/gmsm/internal/subtle"
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"github.com/emmansun/gmsm/internal/xor"
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)
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// NewCipher create a stream cipher based on key and iv aguments.
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func NewCipher(key, iv []byte) (cipher.Stream, error) {
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return newZUCState(key, iv)
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}
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// NewEEACipher create a stream cipher based on key, count, bearer and direction arguments according specification.
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func NewEEACipher(key []byte, count, bearer, direction uint32) (cipher.Stream, error) {
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iv := make([]byte, 16)
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binary.BigEndian.PutUint32(iv, count)
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copy(iv[8:12], iv[:4])
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iv[4] = byte(((bearer << 1) | (direction & 1)) << 2)
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iv[12] = iv[4]
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return newZUCState(key, iv)
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}
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func (c *zucState32) XORKeyStream(dst, src []byte) {
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if len(dst) < len(src) {
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panic("zuc: output smaller than input")
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}
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if subtle.InexactOverlap(dst[:len(src)], src) {
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panic("zuc: invalid buffer overlap")
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}
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words := (len(src) + 3) / 4
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var out [4]byte
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for i := 0; i < words; i++ {
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binary.BigEndian.PutUint32(out[:], c.genKeyword())
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xor.XorBytes(dst, src, out[:])
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if i < words-1 {
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dst = dst[4:]
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src = src[4:]
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}
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}
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}
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54
zuc/eea_test.go
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54
zuc/eea_test.go
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package zuc
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import (
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"encoding/hex"
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"testing"
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)
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var zucEEATests = []struct {
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key string
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count uint32
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bearer uint32
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direction uint32
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in string
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out string
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}{
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{
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"173d14ba5003731d7a60049470f00a29",
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0x66035492,
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0xf,
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0,
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"6cf65340735552ab0c9752fa6f9025fe0bd675d9005875b2",
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"a6c85fc66afb8533aafc2518dfe784940ee1e4b030238cc8",
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},
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{
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"e5bd3ea0eb55ade866c6ac58bd54302a",
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0x56823,
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0x18,
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1,
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"14a8ef693d678507bbe7270a7f67ff5006c3525b9807e467c4e56000ba338f5d429559036751822246c80d3b38f07f4be2d8ff5805f5132229bde93bbbdcaf382bf1ee972fbf9977bada8945847a2a6c9ad34a667554e04d1f7fa2c33241bd8f01ba220d",
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"131d43e0dea1be5c5a1bfd971d852cbf712d7b4f57961fea3208afa8bca433f456ad09c7417e58bc69cf8866d1353f74865e80781d202dfb3ecff7fcbc3b190fe82a204ed0e350fc0f6f2613b2f2bca6df5a473a57a4a00d985ebad880d6f23864a07b01",
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},
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}
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func Test_EEA(t *testing.T) {
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for i, test := range zucEEATests {
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key, err := hex.DecodeString(test.key)
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if err != nil {
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t.Error(err)
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}
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c, err := NewEEACipher(key, test.count, test.bearer, test.direction)
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if err != nil {
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t.Error(err)
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}
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in, err := hex.DecodeString(test.in)
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out := make([]byte, len(in))
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if err != nil {
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t.Error(err)
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}
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c.XORKeyStream(out, in)
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if hex.EncodeToString(out) != test.out {
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t.Errorf("case %d, expected=%s, result=%s\n", i+1, test.out, hex.EncodeToString(out))
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}
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}
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}
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