37 lines
1.1 KiB
Go
37 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 (
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"crypto/aes"
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)
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// PadBlock pads a string of bytes less than 16 bytes long to a full block size
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// by appending a one bit followed by zero bits. This is the padding function
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// used in RFCs 4493 and 5297.
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func PadBlock(block []byte) []byte {
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blockLen := len(block)
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if blockLen >= aes.BlockSize {
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panic("PadBlock input must be less than 16 bytes.")
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}
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result := make([]byte, aes.BlockSize)
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copy(result, block)
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result[blockLen] = 0x80
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return result
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}
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