34 lines
1.1 KiB
Go
34 lines
1.1 KiB
Go
// Copyright 2012 Aaron Jacobs. All Rights Reserved.
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// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package common
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import "log"
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// Xor computes `a XOR b`, as defined by RFC 4493. dst, a, and b must all have
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// the same length.
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func Xor(dst []byte, a []byte, b []byte) {
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// TODO(jacobsa): Consider making this a helper function with known sizes
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// where it is most hot, then even trying to inline it entirely.
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if len(dst) != len(a) || len(a) != len(b) {
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log.Panicf("Bad buffer lengths: %d, %d, %d", len(dst), len(a), len(b))
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}
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for i, _ := range a {
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dst[i] = a[i] ^ b[i]
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}
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}
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