mirror of
https://github.com/unidoc/unipdf.git
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d605803bd2
* Remove panic on font nil Differences array * Remove unused bcmaps function * Remove panics from the core/security/crypt package * Fix extractor invalid Do operand crash * Fix TTF parser crash for invalid hhea number of hMetrics * Remove ECB crypt panics * Remove standard_r6 panics * Remove panic from render package
75 lines
1.6 KiB
Go
75 lines
1.6 KiB
Go
/*
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* This file is subject to the terms and conditions defined in
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* file 'LICENSE.md', which is part of this source code package.
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*/
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package security
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import (
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"crypto/cipher"
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"github.com/unidoc/unipdf/v3/common"
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)
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// ecb implements an Electronic Codebook encryption mode.
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// This mode is used to compute or validate document permissions for R=6.
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type ecb struct {
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b cipher.Block
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blockSize int
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}
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func newECB(b cipher.Block) *ecb {
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return &ecb{
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b: b,
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blockSize: b.BlockSize(),
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}
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}
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type ecbEncrypter ecb
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func newECBEncrypter(b cipher.Block) cipher.BlockMode {
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return (*ecbEncrypter)(newECB(b))
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}
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func (x *ecbEncrypter) BlockSize() int { return x.blockSize }
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func (x *ecbEncrypter) CryptBlocks(dst, src []byte) {
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if len(src)%x.blockSize != 0 {
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common.Log.Error("ERROR: ECB encrypt: input not full blocks")
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return
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}
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if len(dst) < len(src) {
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common.Log.Error("ERROR: ECB encrypt: output smaller than input")
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return
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}
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for len(src) > 0 {
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x.b.Encrypt(dst, src[:x.blockSize])
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src = src[x.blockSize:]
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dst = dst[x.blockSize:]
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}
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}
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type ecbDecrypter ecb
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func newECBDecrypter(b cipher.Block) cipher.BlockMode {
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return (*ecbDecrypter)(newECB(b))
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}
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func (x *ecbDecrypter) BlockSize() int { return x.blockSize }
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func (x *ecbDecrypter) CryptBlocks(dst, src []byte) {
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if len(src)%x.blockSize != 0 {
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common.Log.Error("ERROR: ECB decrypt: input not full blocks")
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return
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}
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if len(dst) < len(src) {
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common.Log.Error("ERROR: ECB decrypt: output smaller than input")
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return
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}
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for len(src) > 0 {
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x.b.Decrypt(dst, src[:x.blockSize])
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src = src[x.blockSize:]
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dst = dst[x.blockSize:]
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}
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}
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