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zuc: eea, fix can't src/dst can't use same buffer issue #169

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This commit is contained in:
emmansun 2023-09-29 09:57:27 +08:00
parent 5b3dfb6fa7
commit 400147ed3c
5 changed files with 23 additions and 42 deletions
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8
zuc/core.go
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@ -237,11 +237,3 @@ func (s *zucState32) genKeywords(words []uint32) {
}
genKeyStream(words, s)
}
func genKeyStreamRev32(keyStream []byte, pState *zucState32) {
for len(keyStream) >= 4 {
z := genKeyword(pState)
binary.BigEndian.PutUint32(keyStream, z)
keyStream = keyStream[4:]
}
}

26
zuc/eea.go
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@ -25,7 +25,21 @@ func NewEEACipher(key []byte, count, bearer, direction uint32) (cipher.Stream, e
return newZUCState(key, iv)
}
func xorKeyStreamGeneric(c *zucState32, dst, src []byte) {
func genKeyStreamRev32Generic(keyStream []byte, pState *zucState32) {
for len(keyStream) >= 4 {
z := genKeyword(pState)
binary.BigEndian.PutUint32(keyStream, z)
keyStream = keyStream[4:]
}
}
func (c *zucState32) XORKeyStream(dst, src []byte) {
if len(dst) < len(src) {
panic("zuc: output smaller than input")
}
if alias.InexactOverlap(dst[:len(src)], src) {
panic("zuc: invalid buffer overlap")
}
words := (len(src) + 3) / 4
rounds := words / RoundWords
var keyBytes [RoundWords * 4]byte
@ -40,13 +54,3 @@ func xorKeyStreamGeneric(c *zucState32, dst, src []byte) {
subtle.XORBytes(dst, src, keyBytes[:])
}
}
func (c *zucState32) XORKeyStream(dst, src []byte) {
if len(dst) < len(src) {
panic("zuc: output smaller than input")
}
if alias.InexactOverlap(dst[:len(src)], src) {
panic("zuc: invalid buffer overlap")
}
xorKeyStream(c, dst, src)
}

22
zuc/eea_asm.go
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@ -3,29 +3,13 @@
package zuc
import (
"github.com/emmansun/gmsm/internal/subtle"
)
//go:noescape
func genKeyStreamRev32Asm(keyStream []byte, pState *zucState32)
func xorKeyStream(c *zucState32, dst, src []byte) {
func genKeyStreamRev32(keyStream []byte, pState *zucState32) {
if supportsAES {
words := len(src) / 4
// handle complete words first
if words > 0 {
dstWords := dst[:words*4]
genKeyStreamRev32Asm(dstWords, c)
subtle.XORBytes(dst, src, dstWords)
}
// handle remain bytes
if words*4 < len(src) {
var singleWord [4]byte
genKeyStreamRev32Asm(singleWord[:], c)
subtle.XORBytes(dst[words*4:], src[words*4:], singleWord[:])
}
genKeyStreamRev32Asm(keyStream, pState)
} else {
xorKeyStreamGeneric(c, dst, src)
genKeyStreamRev32Generic(keyStream, pState)
}
}

4
zuc/eea_generic.go
View File

@ -3,6 +3,6 @@
package zuc
func xorKeyStream(c *zucState32, dst, src []byte) {
xorKeyStreamGeneric(c, dst, src)
func genKeyStreamRev32(keyStream []byte, pState *zucState32) {
genKeyStreamRev32Generic(keyStream, pState)
}

5
zuc/eea_test.go
View File

@ -50,11 +50,12 @@ func Test_EEA(t *testing.T) {
t.Error(err)
}
in, err := hex.DecodeString(test.in)
out := make([]byte, len(in))
if err != nil {
t.Error(err)
}
c.XORKeyStream(out, in)
out := make([]byte, len(in))
copy(out, in)
c.XORKeyStream(out, out)
if hex.EncodeToString(out) != test.out {
t.Errorf("case %d, expected=%s, result=%s\n", i+1, test.out, hex.EncodeToString(out))
}