164 lines
3.5 KiB
Go
164 lines
3.5 KiB
Go
package payload
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import (
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"archive/zip"
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"crypto/cipher"
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"crypto/rand"
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"encoding/json"
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"io"
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"github.com/didiercrunch/filou/contract"
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)
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type BlockModeStream func(block cipher.Block, iv []byte) cipher.Stream
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type Payload struct {
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DataSource io.Reader
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Random io.Reader
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HashMethod Hash
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Block Block
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BlockMode BlockMode
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IV []byte
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Key []byte
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Hash []byte
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}
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func GetDefaultPayload(dataSource io.Reader) *Payload {
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return &Payload{
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DataSource: dataSource,
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Random: rand.Reader,
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HashMethod: SHA512,
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Block: AES256,
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BlockMode: OFB,
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}
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}
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func GetPayload(dataSource io.Reader, acceptedContract *contract.AcceptedContract) (*Payload, error) {
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ret := &Payload{DataSource: dataSource, Random: rand.Reader}
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errs := make([]error, 0)
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var err error
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if ret.HashMethod, err = GetHashByHashName(acceptedContract.Hash); err != nil {
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errs = append(errs, err)
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}
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return ret, nil
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}
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type payloadWriter struct {
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Reader io.Reader
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Pipewriter io.WriteCloser
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ZipWriter *zip.Writer
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}
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func getPayloadWriter() *payloadWriter {
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p := new(payloadWriter)
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p.Reader, p.Pipewriter = io.Pipe()
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p.ZipWriter = zip.NewWriter(p.Pipewriter)
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return p
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}
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func (this *payloadWriter) getDataWriter() (io.Writer, error) {
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return this.ZipWriter.Create("data")
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}
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func (this *payloadWriter) getMetadataWriter() (io.Writer, error) {
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return this.ZipWriter.Create("metadata")
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}
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func (this *payloadWriter) Close() error {
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if err := this.ZipWriter.Close(); err != nil {
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return err
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}
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return this.Pipewriter.Close()
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}
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func (this *Payload) GetMode() string {
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return string(this.BlockMode)
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}
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func (this *Payload) GetHash() []byte {
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return this.Hash
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}
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func (this *Payload) GetKey() []byte {
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return this.Key
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}
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func (this *Payload) GetAlgorithm() string {
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return string(this.Block)
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}
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func (this *Payload) GetHashMethod() string {
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return string(this.HashMethod)
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}
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func (this *Payload) GetPayloadData() (io.Reader, error) {
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pw := getPayloadWriter()
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stream, err := this.getStreamAndCreateMetadata()
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if err != nil {
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return nil, err
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}
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go func(payload *Payload, pw *payloadWriter) {
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if mdw, err := pw.getMetadataWriter(); err != nil {
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panic(err)
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} else if err := payload.writeMetadata(mdw); err != nil {
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panic(err)
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}
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if mw, err := pw.getDataWriter(); err != nil {
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panic(err)
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} else if _, err := io.Copy(mw, payload.DataSource); err != nil {
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panic(err)
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}
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if err := pw.Close(); err != nil {
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panic(err)
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}
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}(this, pw)
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return this.encrypt(pw.Reader, stream)
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}
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func (this *Payload) writeMetadata(w io.Writer) error {
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e := json.NewEncoder(w)
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return e.Encode(this.getMetadata())
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}
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func (this *Payload) getMetadata() *Metadata {
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return &Metadata{IV: this.IV, Key: this.Key}
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}
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func (this *Payload) getStreamAndCreateMetadata() (stream cipher.Stream, err error) {
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var block cipher.Block
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block, this.Key, err = this.Block.CreateBlock(this.Random)
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if err != nil {
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return
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}
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stream, this.IV, err = this.BlockMode.GetCipherStream(block, this.Random)
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return
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}
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func (this *Payload) computeHash(reader io.Reader) (io.Reader, error) {
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readerHash := make(chan []byte)
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read, err := this.HashMethod.HashOnTheWay(reader, readerHash)
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if err != nil {
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return nil, err
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}
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go func(readerHash chan []byte) {
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this.Hash = <-readerHash
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}(readerHash)
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return read, nil
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}
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func (this *Payload) encrypt(reader io.Reader, stream cipher.Stream) (io.Reader, error) {
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ret, writer := io.Pipe()
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go func(stream cipher.Stream) {
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cipherWriter := &cipher.StreamWriter{S: stream, W: writer}
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io.Copy(cipherWriter, reader)
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cipherWriter.Close()
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}(stream)
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return this.computeHash(ret)
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}
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