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231 lines
9.1 KiB
Go
231 lines
9.1 KiB
Go
// Package zuc handle shangmi zuc stream cipher.
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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 for ZUC-128
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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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// constant D-0 for ZUC-256
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var zuc256_d0 = [16]byte{
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0x22, 0x2F, 0x24, 0x2A, 0x6D, 0x40, 0x40, 0x40,
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0x40, 0x40, 0x40, 0x40, 0x40, 0x52, 0x10, 0x30,
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}
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var zuc256_d = [][16]byte{
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{
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0x22, 0x2F, 0x25, 0x2A, 0x6D, 0x40, 0x40, 0x40,
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0x40, 0x40, 0x40, 0x40, 0x40, 0x52, 0x10, 0x30,
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},
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{
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0x23, 0x2F, 0x24, 0x2A, 0x6D, 0x40, 0x40, 0x40,
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0x40, 0x40, 0x40, 0x40, 0x40, 0x52, 0x10, 0x30,
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},
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{
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0x23, 0x2F, 0x25, 0x2A, 0x6D, 0x40, 0x40, 0x40,
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0x40, 0x40, 0x40, 0x40, 0x40, 0x52, 0x10, 0x30,
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},
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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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x0 uint32 // Output X0 of the bit reorganization
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x1 uint32 // Output X1 of the bit reorganization
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x2 uint32 // Output X2 of the bit reorganization
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x3 uint32 // Output X3 of the bit reorganization
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}
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func (s *zucState32) bitReorganization() {
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s.x0 = ((s.lfsr[15] & 0x7FFF8000) << 1) | (s.lfsr[14] & 0xFFFF)
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s.x1 = ((s.lfsr[11] & 0xFFFF) << 16) | (s.lfsr[9] >> 15)
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s.x2 = ((s.lfsr[7] & 0xFFFF) << 16) | (s.lfsr[5] >> 15)
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s.x3 = ((s.lfsr[2] & 0xFFFF) << 16) | (s.lfsr[0] >> 15)
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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() uint32 {
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w := s.r1 ^ s.x0 + s.r2
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w1 := s.r1 + s.x1
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w2 := s.r2 ^ s.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 := uint64(s.lfsr[15])<<15 + uint64(s.lfsr[13])<<17 + uint64(s.lfsr[10])<<21 + uint64(s.lfsr[4])<<20 + uint64(s.lfsr[0])<<8 + uint64(s.lfsr[0])
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v = (v & 0x7FFFFFFF) + (v >> 31)
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t := add31(uint32(v), w)
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if t == 0 {
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t = 0x7FFFFFFF
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}
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var temp [16]uint32
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copy(temp[:], s.lfsr[1:])
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copy(s.lfsr[:], temp[:])
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s.lfsr[15] = t
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}
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func (s *zucState32) enterWorkMode() {
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v := uint64(s.lfsr[15])<<15 + uint64(s.lfsr[13])<<17 + uint64(s.lfsr[10])<<21 + uint64(s.lfsr[4])<<20 + uint64(s.lfsr[0])<<8 + uint64(s.lfsr[0])
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v = (v & 0x7FFFFFFF) + (v >> 31)
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if v == 0 {
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v = 0x7FFFFFFF
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}
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var temp [16]uint32
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copy(temp[:], s.lfsr[1:])
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copy(s.lfsr[:], temp[:])
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s.lfsr[15] = uint32(v)
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}
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func makeFieldValue3(a, b, c uint32) uint32 {
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return (a << 23) | (b << 8) | c
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}
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func makeFieldValue4(a, b, c, d uint32) uint32 {
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return (a << 23) | (b << 16) | (c << 8) | d
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}
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func (s *zucState32) loadKeyIV16(key, iv []byte) {
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for i := 0; i < 16; i++ {
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s.lfsr[i] = makeFieldValue3(uint32(key[i]), kd[i], uint32(iv[i]))
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}
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}
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func (s *zucState32) loadKeyIV32(key, iv, d []byte) {
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iv17 := iv[17] >> 2
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iv18 := ((iv[17] & 0x3) << 4) | (iv[18] >> 4)
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iv19 := ((iv[18] & 0xf) << 2) | (iv[19] >> 6)
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iv20 := iv[19] & 0x3f
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iv21 := iv[20] >> 2
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iv22 := ((iv[20] & 0x3) << 4) | (iv[21] >> 4)
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iv23 := ((iv[21] & 0xf) << 2) | (iv[22] >> 6)
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iv24 := iv[22] & 0x3f
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s.lfsr[0] = makeFieldValue4(uint32(key[0]), uint32(d[0]), uint32(key[21]), uint32(key[16]))
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s.lfsr[1] = makeFieldValue4(uint32(key[1]), uint32(d[1]), uint32(key[22]), uint32(key[17]))
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s.lfsr[2] = makeFieldValue4(uint32(key[2]), uint32(d[2]), uint32(key[23]), uint32(key[18]))
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s.lfsr[3] = makeFieldValue4(uint32(key[3]), uint32(d[3]), uint32(key[24]), uint32(key[19]))
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s.lfsr[4] = makeFieldValue4(uint32(key[4]), uint32(d[4]), uint32(key[25]), uint32(key[20]))
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s.lfsr[5] = makeFieldValue4(uint32(iv[0]), uint32(d[5]|iv17), uint32(key[5]), uint32(key[26]))
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s.lfsr[6] = makeFieldValue4(uint32(iv[1]), uint32(d[6]|iv18), uint32(key[6]), uint32(key[27]))
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s.lfsr[7] = makeFieldValue4(uint32(iv[10]), uint32(d[7]|iv19), uint32(key[7]), uint32(iv[2]))
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s.lfsr[8] = makeFieldValue4(uint32(key[8]), uint32(d[8]|iv20), uint32(iv[3]), uint32(iv[11]))
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s.lfsr[9] = makeFieldValue4(uint32(key[9]), uint32(d[9]|iv21), uint32(iv[12]), uint32(iv[4]))
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s.lfsr[10] = makeFieldValue4(uint32(iv[5]), uint32(d[10]|iv22), uint32(key[10]), uint32(key[28]))
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s.lfsr[11] = makeFieldValue4(uint32(key[11]), uint32(d[11]|iv23), uint32(iv[6]), uint32(iv[13]))
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s.lfsr[12] = makeFieldValue4(uint32(key[12]), uint32(d[12]|iv24), uint32(iv[7]), uint32(iv[14]))
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s.lfsr[13] = makeFieldValue4(uint32(key[13]), uint32(d[13]), uint32(iv[15]), uint32(iv[8]))
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s.lfsr[14] = makeFieldValue4(uint32(key[14]), uint32(d[14]|(key[31]>>4)), uint32(iv[16]), uint32(iv[9]))
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s.lfsr[15] = makeFieldValue4(uint32(key[15]), uint32(d[15]|(key[31]&0x0f)), uint32(key[30]), uint32(key[29]))
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}
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func newZUCState(key, iv []byte) (*zucState32, error) {
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k := len(key)
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ivLen := len(iv)
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state := &zucState32{}
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switch k {
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default:
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return nil, fmt.Errorf("zuc: invalid key size %d, we support 16/32 now", k)
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case 16: // ZUC-128
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if ivLen != 16 {
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return nil, fmt.Errorf("zuc: invalid iv size %d, expect 16 in bytes", ivLen)
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}
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state.loadKeyIV16(key, iv)
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case 32: // ZUC-256
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if ivLen != 23 {
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return nil, fmt.Errorf("zuc: invalid iv size %d, expect 23 in bytes", ivLen)
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}
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state.loadKeyIV32(key, iv, zuc256_d0[:])
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}
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// initialization
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for i := 0; i < 32; i++ {
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state.bitReorganization()
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w := state.f32()
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state.enterInitMode(w >> 1)
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}
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// work state
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state.bitReorganization()
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state.f32()
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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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return genKeyword(s)
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}
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func (s *zucState32) genKeywords(words []uint32) {
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if len(words) == 0 {
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return
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}
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genKeyStream(words, s)
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}
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