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26 lines
627 B
Go
26 lines
627 B
Go
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package cryptoutil
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import (
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"crypto/aes"
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)
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// Returns a new byte array padded with PKCS7 and prepended
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// with empty space of the AES block size (16 bytes) for the IV.
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func padPKCS7WithIV(src []byte) []byte {
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missing := aes.BlockSize - (len(src) % aes.BlockSize)
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newSize := len(src) + aes.BlockSize + missing
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dest := make([]byte, newSize, newSize)
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copy(dest[aes.BlockSize:], src)
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padding := byte(missing)
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for i := newSize - missing; i < newSize; i++ {
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dest[i] = padding
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}
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return dest
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}
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func unpadPKCS7(src []byte) []byte {
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padLen := src[len(src)-1]
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return src[:len(src)-int(padLen)]
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}
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