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sm4: fallback ctr change

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Sun Yimin 2025-02-26 10:24:46 +08:00 committed by GitHub
parent 27e7ceacbc
commit 8a25134c82
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1 changed files with 3 additions and 2 deletions
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5
sm4/ctr_cipher_asm.go
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@ -34,17 +34,18 @@ func (c *sm4CipherAsm) NewCTR(iv []byte) cipher.Stream {
} }
s := &ctr{ s := &ctr{
b: c, b: c,
ctr: bytes.Clone(iv), ctr: make([]byte, c.blocksSize),
out: make([]byte, 0, bufSize), out: make([]byte, 0, bufSize),
outUsed: 0, outUsed: 0,
} }
copy(s.ctr, iv)
for i := 1; i < c.batchBlocks; i++ { for i := 1; i < c.batchBlocks; i++ {
s.genCtr(i * BlockSize) s.genCtr(i * BlockSize)
} }
return s return s
} }
func (x *ctr) genCtr(start int) { func (x *ctr) genCtr(start int) {
if start >= BlockSize { if start >= BlockSize {
copy(x.ctr[start:], x.ctr[start-BlockSize:start]) copy(x.ctr[start:], x.ctr[start-BlockSize:start])