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subtle: fix generic bug

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Sun Yimin 2022-08-18 15:00:11 +08:00 committed by GitHub
parent 1710bdff4a
commit 6db1b23eb1
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4 changed files with 49 additions and 21 deletions
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20
internal/subtle/xor.go
View File

@ -1,20 +0,0 @@
package subtle
// XORBytes sets dst[i] = x[i] ^ y[i] for all i < n = min(len(x), len(y)),
// returning n, the number of bytes written to dst.
// If dst does not have length at least n,
// XORBytes panics without writing anything to dst.
func XORBytes(dst, x, y []byte) int {
n := len(x)
if len(y) < n {
n = len(y)
}
if n == 0 {
return 0
}
if n > len(dst) {
panic("subtle.XORBytes: dst too short")
}
xorBytes(&dst[0], &x[0], &y[0], n) // arch-specific
return n
}

17
internal/subtle/xor_amd64.go
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@ -7,5 +7,22 @@
package subtle
// XORBytes xors the bytes in a and b. The destination should have enough
// space, otherwise XORBytes will panic. Returns the number of bytes xor'd.
func XORBytes(dst, a, b []byte) int {
n := len(a)
if len(b) < n {
n = len(b)
}
if n == 0 {
return 0
}
if n > len(dst) {
panic("subtle.XORBytes: dst too short")
}
xorBytes(&dst[0], &a[0], &b[0], n) // amd64 must have SSE2
return n
}
//go:noescape
func xorBytes(dst, a, b *byte, n int)

18
internal/subtle/xor_arm64.go
View File

@ -7,5 +7,23 @@
package subtle
// XORBytes xors the bytes in a and b. The destination should have enough
// space, otherwise XORBytes will panic. Returns the number of bytes xor'd.
func XORBytes(dst, a, b []byte) int {
n := len(a)
if len(b) < n {
n = len(b)
}
if n == 0 {
return 0
}
if n > len(dst) {
panic("subtle.XORBytes: dst too short")
}
xorBytes(&dst[0], &a[0], &b[0], n)
return n
}
//go:noescape
func xorBytes(dst, a, b *byte, n int)

15
internal/subtle/xor_generic.go
View File

@ -19,7 +19,20 @@ const supportsUnaligned = runtime.GOARCH == "386" ||
runtime.GOARCH == "ppc64le" ||
runtime.GOARCH == "s390x"
func xorBytes(dst, a, b []byte, n int) int {
// XORBytes xors the bytes in a and b. The destination should have enough
// space, otherwise XORBytes will panic. Returns the number of bytes xor'd.
func XORBytes(dst, a, b []byte) int {
n := len(a)
if len(b) < n {
n = len(b)
}
if n == 0 {
return 0
}
if n > len(dst) {
panic("subtle.XORBytes: dst too short")
}
switch {
case supportsUnaligned:
fastXORBytes(dst, a, b, n)