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/*
Copyright Suzhou Tongji Fintech Research Institute 2017 All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package sm3
import (
"encoding/binary"
"hash"
)
type SM3 struct {
digest [8]uint32 // digest represents the partial evaluation of V
length uint64 // length of the message
unhandleMsg []byte // uint8 //
}
func (sm3 *SM3) ff0(x, y, z uint32) uint32 { return x ^ y ^ z }
func (sm3 *SM3) ff1(x, y, z uint32) uint32 { return (x & y) | (x & z) | (y & z) }
func (sm3 *SM3) gg0(x, y, z uint32) uint32 { return x ^ y ^ z }
func (sm3 *SM3) gg1(x, y, z uint32) uint32 { return (x & y) | (^x & z) }
func (sm3 *SM3) p0(x uint32) uint32 { return x ^ sm3.leftRotate(x, 9) ^ sm3.leftRotate(x, 17) }
func (sm3 *SM3) p1(x uint32) uint32 { return x ^ sm3.leftRotate(x, 15) ^ sm3.leftRotate(x, 23) }
func (sm3 *SM3) leftRotate(x uint32, i uint32) uint32 { return (x<<(i%32) | x>>(32-i%32)) }
func (sm3 *SM3) pad() []byte {
msg := sm3.unhandleMsg
msg = append(msg, 0x80) // Append '1'
blockSize := 64 // Append until the resulting message length (in bits) is congruent to 448 (mod 512)
for len(msg)%blockSize != 56 {
msg = append(msg, 0x00)
}
// append message length
msg = append(msg, uint8(sm3.length>>56&0xff))
msg = append(msg, uint8(sm3.length>>48&0xff))
msg = append(msg, uint8(sm3.length>>40&0xff))
msg = append(msg, uint8(sm3.length>>32&0xff))
msg = append(msg, uint8(sm3.length>>24&0xff))
msg = append(msg, uint8(sm3.length>>16&0xff))
msg = append(msg, uint8(sm3.length>>8&0xff))
msg = append(msg, uint8(sm3.length>>0&0xff))
if len(msg)%64 != 0 {
panic("------SM3 Pad: error msgLen =")
}
return msg
}
func (sm3 *SM3) update(msg []byte, nblocks int) {
var w [68]uint32
var w1 [64]uint32
a, b, c, d, e, f, g, h := sm3.digest[0], sm3.digest[1], sm3.digest[2], sm3.digest[3], sm3.digest[4], sm3.digest[5], sm3.digest[6], sm3.digest[7]
for len(msg) >= 64 {
for i := 0; i < 16; i++ {
w[i] = binary.BigEndian.Uint32(msg[4*i : 4*(i+1)])
}
for i := 16; i < 68; i++ {
w[i] = sm3.p1(w[i-16]^w[i-9]^sm3.leftRotate(w[i-3], 15)) ^ sm3.leftRotate(w[i-13], 7) ^ w[i-6]
}
for i := 0; i < 64; i++ {
w1[i] = w[i] ^ w[i+4]
}
A, B, C, D, E, F, G, H := a, b, c, d, e, f, g, h
for i := 0; i < 16; i++ {
SS1 := sm3.leftRotate(sm3.leftRotate(A, 12)+E+sm3.leftRotate(0x79cc4519, uint32(i)), 7)
SS2 := SS1 ^ sm3.leftRotate(A, 12)
TT1 := sm3.ff0(A, B, C) + D + SS2 + w1[i]
TT2 := sm3.gg0(E, F, G) + H + SS1 + w[i]
D = C
C = sm3.leftRotate(B, 9)
B = A
A = TT1
H = G
G = sm3.leftRotate(F, 19)
F = E
E = sm3.p0(TT2)
}
for i := 16; i < 64; i++ {
SS1 := sm3.leftRotate(sm3.leftRotate(A, 12)+E+sm3.leftRotate(0x7a879d8a, uint32(i)), 7)
SS2 := SS1 ^ sm3.leftRotate(A, 12)
TT1 := sm3.ff1(A, B, C) + D + SS2 + w1[i]
TT2 := sm3.gg1(E, F, G) + H + SS1 + w[i]
D = C
C = sm3.leftRotate(B, 9)
B = A
A = TT1
H = G
G = sm3.leftRotate(F, 19)
F = E
E = sm3.p0(TT2)
}
a ^= A
b ^= B
c ^= C
d ^= D
e ^= E
f ^= F
g ^= G
h ^= H
msg = msg[64:]
}
sm3.digest[0], sm3.digest[1], sm3.digest[2], sm3.digest[3], sm3.digest[4], sm3.digest[5], sm3.digest[6], sm3.digest[7] = a, b, c, d, e, f, g, h
}
func New() hash.Hash {
var sm3 SM3
sm3.Reset()
return &sm3
}
// BlockSize, required by the hash.Hash interface.
// BlockSize returns the hash's underlying block size.
// The Write method must be able to accept any amount
// of data, but it may operate more efficiently if all writes
// are a multiple of the block size.
func (sm3 *SM3) BlockSize() int { return 64 }
// Size, required by the hash.Hash interface.
// Size returns the number of bytes Sum will return.
func (sm3 *SM3) Size() int { return 32 }
// Reset clears the internal state by zeroing bytes in the state buffer.
// This can be skipped for a newly-created hash state; the default zero-allocated state is correct.
func (sm3 *SM3) Reset() {
// Reset digest
sm3.digest[0] = 0x7380166f
sm3.digest[1] = 0x4914b2b9
sm3.digest[2] = 0x172442d7
sm3.digest[3] = 0xda8a0600
sm3.digest[4] = 0xa96f30bc
sm3.digest[5] = 0x163138aa
sm3.digest[6] = 0xe38dee4d
sm3.digest[7] = 0xb0fb0e4e
sm3.length = 0 // Reset numberic states
sm3.unhandleMsg = []byte{}
}
// Write, required by the hash.Hash interface.
// Write (via the embedded io.Writer interface) adds more data to the running hash.
// It never returns an error.
func (sm3 *SM3) Write(p []byte) (int, error) {
toWrite := len(p)
sm3.length += uint64(len(p) * 8)
msg := append(sm3.unhandleMsg, p...)
nblocks := len(msg) / sm3.BlockSize()
sm3.update(msg, nblocks)
// Update unhandleMsg
sm3.unhandleMsg = msg[nblocks*sm3.BlockSize():]
return toWrite, nil
}
// Sum, required by the hash.Hash interface.
// Sum appends the current hash to b and returns the resulting slice.
// It does not change the underlying hash state.
func (sm3 *SM3) Sum(in []byte) []byte {
sm3.Write(in)
msg := sm3.pad()
// Finialize
sm3.update(msg, len(msg)/sm3.BlockSize())
// save hash to in
needed := sm3.Size()
if cap(in)-len(in) < needed {
newIn := make([]byte, len(in), len(in)+needed)
copy(newIn, in)
in = newIn
}
out := in[len(in) : len(in)+needed]
for i := 0; i < 8; i++ {
binary.BigEndian.PutUint32(out[i*4:], sm3.digest[i])
}
return out
}
func Sm3Sum(data []byte) []byte {
var sm3 SM3
sm3.Reset()
sm3.Write(data)
return sm3.Sum(nil)
}
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