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sm4: fix bug

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Sun Yimin 2023-06-05 14:46:59 +08:00 committed by GitHub
parent 57d800767b
commit 83849d33cf
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 2 additions and 3 deletions
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5
sm4/block.go
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@ -70,7 +70,7 @@ func encryptBlockGo(xk []uint32, dst, src []byte) {
// Key expansion algorithm. // Key expansion algorithm.
func expandKeyGo(key []byte, enc, dec []uint32) { func expandKeyGo(key []byte, enc, dec []uint32) {
// Encryption key setup. // Encryption key setup.
enc = enc[:rounds-1] enc = enc[:rounds]
var i int var i int
var mk [4]uint32 var mk [4]uint32
var k [rounds + 4]uint32 var k [rounds + 4]uint32
@ -85,7 +85,6 @@ func expandKeyGo(key []byte, enc, dec []uint32) {
mk[3] = binary.BigEndian.Uint32(key[12:]) mk[3] = binary.BigEndian.Uint32(key[12:])
k[3] = mk[3] ^ fk[3] k[3] = mk[3] ^ fk[3]
_ = enc[rounds-1]
for i = 0; i < rounds; i++ { for i = 0; i < rounds; i++ {
k[i+4] = k[i] ^ t2(k[i+1]^k[i+2]^k[i+3]^ck[i]) k[i+4] = k[i] ^ t2(k[i+1]^k[i+2]^k[i+3]^ck[i])
enc[i] = k[i+4] enc[i] = k[i+4]
@ -96,7 +95,7 @@ func expandKeyGo(key []byte, enc, dec []uint32) {
return return
} }
dec = dec[:rounds-1] dec = dec[:rounds]
for i = 0; i < rounds; i++ { for i = 0; i < rounds; i++ {
dec[i] = enc[rounds-1-i] dec[i] = enc[rounds-1-i]
} }