mirror of
https://github.com/emmansun/gmsm.git
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114 lines
2.8 KiB
Go
114 lines
2.8 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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"github.com/emmansun/gmsm/internal/subtle"
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"golang.org/x/sys/cpu"
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)
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var supportSM4 = cpu.ARM64.HasSM4
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var supportsAES = cpu.X86.HasAES || cpu.ARM64.HasAES
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var supportsGFMUL = cpu.X86.HasPCLMULQDQ || cpu.ARM64.HasPMULL
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var useAVX2 = cpu.X86.HasAVX2 && cpu.X86.HasBMI2
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//go:noescape
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func encryptBlocksAsm(xk *uint32, dst, src []byte)
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//go:noescape
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func encryptBlockAsm(xk *uint32, dst, src *byte)
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//go:noescape
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func expandKeyAsm(key *byte, ck, enc, dec *uint32)
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type sm4CipherAsm struct {
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sm4Cipher
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batchBlocks int
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blocksSize int
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}
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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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blocks := 4
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if useAVX2 {
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blocks = 8
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}
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c := sm4CipherAsm{sm4Cipher{make([]uint32, rounds), make([]uint32, rounds)}, blocks, blocks * BlockSize}
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expandKeyAsm(&key[0], &ck[0], &c.enc[0], &c.dec[0])
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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) Concurrency() int { return c.batchBlocks }
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func (c *sm4CipherAsm) Encrypt(dst, src []byte) {
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if len(src) < BlockSize {
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panic("sm4: input not full block")
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}
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if len(dst) < BlockSize {
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panic("sm4: output not full block")
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}
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if subtle.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
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panic("sm4: invalid buffer overlap")
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}
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encryptBlockAsm(&c.enc[0], &dst[0], &src[0])
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}
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func (c *sm4CipherAsm) EncryptBlocks(dst, src []byte) {
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if len(src) < c.blocksSize {
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panic("sm4: input not full blocks")
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}
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if len(dst) < c.blocksSize {
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panic("sm4: output not full blocks")
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}
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if subtle.InexactOverlap(dst[:c.blocksSize], src[:c.blocksSize]) {
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panic("sm4: invalid buffer overlap")
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}
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encryptBlocksAsm(&c.enc[0], 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("sm4: input not full block")
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}
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if len(dst) < BlockSize {
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panic("sm4: output not full block")
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}
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if subtle.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
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panic("sm4: invalid buffer overlap")
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}
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encryptBlockAsm(&c.dec[0], &dst[0], &src[0])
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}
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func (c *sm4CipherAsm) DecryptBlocks(dst, src []byte) {
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if len(src) < c.blocksSize {
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panic("sm4: input not full blocks")
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}
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if len(dst) < c.blocksSize {
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panic("sm4: output not full blocks")
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}
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if subtle.InexactOverlap(dst[:c.blocksSize], src[:c.blocksSize]) {
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panic("sm4: invalid buffer overlap")
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}
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encryptBlocksAsm(&c.dec[0], 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[0], &ck[0], &enc[0], &dec[0])
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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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