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55 lines
1.6 KiB
Go
55 lines
1.6 KiB
Go
package io
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import (
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"crypto/cipher"
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"io"
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)
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// CryptionReader is a general purpose reader that applies a stream cipher on top of a regular reader.
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type CryptionReader struct {
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stream cipher.Stream
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reader io.Reader
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}
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// NewCryptionReader creates a new CryptionReader instance from given stream cipher and reader.
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func NewCryptionReader(stream cipher.Stream, reader io.Reader) *CryptionReader {
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return &CryptionReader{
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stream: stream,
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reader: reader,
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}
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}
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// Read reads blocks from underlying reader, and crypt it. The content of blocks is modified in place.
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func (reader CryptionReader) Read(blocks []byte) (int, error) {
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nBytes, err := reader.reader.Read(blocks)
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if nBytes > 0 {
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reader.stream.XORKeyStream(blocks[:nBytes], blocks[:nBytes])
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}
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return nBytes, err
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}
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// Cryption writer is a general purpose of byte stream writer that applies a stream cipher on top of a regular writer.
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type CryptionWriter struct {
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stream cipher.Stream
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writer io.Writer
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}
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// NewCryptionWriter creates a new CryptionWriter from given stream cipher and writer.
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func NewCryptionWriter(stream cipher.Stream, writer io.Writer) *CryptionWriter {
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return &CryptionWriter{
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stream: stream,
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writer: writer,
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}
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}
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// Crypt crypts the content of blocks without writing them into the underlying writer.
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func (writer CryptionWriter) Crypt(blocks []byte) {
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writer.stream.XORKeyStream(blocks, blocks)
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}
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// Write crypts the content of blocks in place, and then writes the give blocks to underlying writer.
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func (writer CryptionWriter) Write(blocks []byte) (int, error) {
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writer.Crypt(blocks)
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return writer.writer.Write(blocks)
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}
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