yaole
71 lines
1.6 KiB
Go
71 lines
1.6 KiB
Go
//go:build amd64 || arm64
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// +build amd64 arm64
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package sm4
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import (
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"crypto/cipher"
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"golang.org/x/sys/cpu"
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"xdx.jelly/xgcl/internal/subtle"
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)
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type sm4CipherAsm struct {
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sm4Cipher
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}
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var supportsAES = cpu.X86.HasAES || cpu.ARM64.HasSM4
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var supportsGFMUL = cpu.X86.HasPCLMULQDQ || cpu.ARM64.HasPMULL
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func newCipher(key []byte) (cipher.Block, error) {
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if !supportsAES {
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return newCipherGeneric(key)
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}
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c := sm4CipherAsm{sm4Cipher{}}
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expandKeyAsm(key, c.encKey[:], c.decKey[:])
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if supportsAES && supportsGFMUL {
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return &sm4CipherGCM{c}, nil
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}
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return &c, nil
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}
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func (c *sm4CipherAsm) BlockSize() int { return BlockSize }
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func (c *sm4CipherAsm) Encrypt(dst, src []byte) {
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if len(src) < BlockSize {
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panic("gcl/sm/sm4/Encrypt: input not full block")
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}
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if len(dst) < BlockSize {
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panic("gcl/sm/sm4/Encrypt: output not full block")
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}
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if subtle.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
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panic("gcl/sm/sm4/Encrypt: invalid buffer overlap")
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}
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encryptBlockAsm(c.encKey[:], dst, src)
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}
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func (c *sm4CipherAsm) Decrypt(dst, src []byte) {
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if len(src) < BlockSize {
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panic("gcl/sm/sm4/Encrypt: input not full block")
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}
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if len(dst) < BlockSize {
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panic("gcl/sm/sm4/Encrypt: output not full block")
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}
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if subtle.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
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panic("gcl/sm/sm4/Encrypt: invalid buffer overlap")
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}
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decryptBlockAsm(c.decKey[:], dst, src)
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}
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// expandKey is used by BenchmarkExpand to ensure that the asm implementation
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// of key expansion is used for the benchmark when it is available.
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func expandKey(key []byte, enc, dec []uint32) {
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if supportsAES {
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expandKeyAsm(key, enc, dec)
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} else {
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expandKeyGo(key, enc, dec)
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}
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}
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