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cipher_ni.go
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cipher_ni.go
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//go:build (amd64 || arm64) && !purego
package sm4
import (
"crypto/cipher"
"github.com/emmansun/gmsm/internal/alias"
)
type sm4CipherNI struct {
sm4Cipher
}
func newCipherNI(key []byte) (cipher.Block, error) {
c := &sm4CipherNIGCM{sm4CipherNI{sm4Cipher{}}}
expandKeyAsm(&key[0], &ck[0], &c.enc[0], &c.dec[0], INST_SM4)
if supportsGFMUL {
return c, nil
}
return &c.sm4CipherNI, nil
}
func (c *sm4CipherNI) Encrypt(dst, src []byte) {
if len(src) < BlockSize {
panic("sm4: input not full block")
}
if len(dst) < BlockSize {
panic("sm4: output not full block")
}
if alias.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
panic("sm4: invalid buffer overlap")
}
encryptBlockAsm(&c.enc[0], &dst[0], &src[0], INST_SM4)
}
func (c *sm4CipherNI) Decrypt(dst, src []byte) {
if len(src) < BlockSize {
panic("sm4: input not full block")
}
if len(dst) < BlockSize {
panic("sm4: output not full block")
}
if alias.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
panic("sm4: invalid buffer overlap")
}
encryptBlockAsm(&c.dec[0], &dst[0], &src[0], INST_SM4)
}