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23 lines
500 B
Go
23 lines
500 B
Go
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package sm4
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// xorBytes xors the bytes in a and b. The destination should have enough
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// space, otherwise xorBytes will panic. Returns the number of bytes xor'd.
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func xorBytes(dst, a, b []byte) int {
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n := len(a)
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if len(b) < n {
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n = len(b)
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}
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if n == 0 {
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return 0
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}
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_ = dst[n-1]
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xorBytesSSE2(&dst[0], &a[0], &b[0], n) // amd64 must have SSE2
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return n
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}
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func xorWords(dst, a, b []byte) {
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xorBytes(dst, a, b)
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}
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//go:noescape
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func xorBytesSSE2(dst, a, b *byte, n int)
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