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allow to use input iv. 在工具函数SM4Cbc中，允许使用通过形参输入的iv，以支持并行调用。（兼容使用全局变量IV的情况） #200

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allow to use input iv. 在工具函数SM4Cbc中，允许使用通过形参输入的iv，以支持并行调用。（兼容使用全局变量IV的情况） #200

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11 changes: 9 additions & 2 deletions sm4/sm4.go
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Original file line number Diff line number Diff line change
Expand Up @@ -299,7 +299,7 @@ func SetIV(iv []byte) error {
return nil
}

func Sm4Cbc(key []byte, in []byte, mode bool) (out []byte, err error) {
func Sm4Cbc(key []byte, in []byte, mode bool, ivInput ...[]byte) (out []byte, err error) {
if len(key) != BlockSize {
return nil, errors.New("SM4: invalid key size " + strconv.Itoa(len(key)))
}
Expand All @@ -310,7 +310,14 @@ func Sm4Cbc(key []byte, in []byte, mode bool) (out []byte, err error) {
inData = in
}
iv := make([]byte, BlockSize)
copy(iv, IV)
if ivInput != nil {
if len(ivInput[0]) != BlockSize {
return nil, errors.New("SM4: invalid iv size")
}
copy(iv, ivInput[0])
} else {
copy(iv, IV)
}
out = make([]byte, len(inData))
c, err := NewCipher(key)
if err != nil {
Expand Down