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zenc.go
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zenc.go
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package zenc
import (
"bytes"
"io"
)
func verifyFileType(header FileHeader) error {
if !bytes.Equal(header.Magic[:], Magic[:]) {
return ErrWrongFileType
}
return nil
}
func verifyChecksum(expected, actual uint32) error {
if expected != actual {
return ErrWrongChecksum
}
return nil
}
// EncryptFile encrypts file using the given password
func EncryptFile(src io.Reader, dst io.Writer, pass string) (err error) {
header := NewFileHeader()
footer := NewFileFooter()
pipeline := NewPipeline()
_, err = header.WriteTo(dst)
if err != nil {
return
}
checksumStage := NewChecksumStage()
pipeline.AddStage(checksumStage)
pipeline.AddStage(NewCryptoStage(pass, header.IV[:]))
pipeline.AddStage(NewChunkStage())
pipeline.AddStage(NewDestStage(dst))
_, err = io.Copy(pipeline, src)
if err != nil {
return
}
err = pipeline.Close()
if err != nil {
return
}
footer.Checksum = checksumStage.Sum
_, err = footer.WriteTo(dst)
return
}
// DecryptFile decrypts file using the given password
func DecryptFile(src io.Reader, dst io.Writer, pass string) (err error) {
header := FileHeader{}
footer := FileFooter{}
pipeline := NewPipeline()
_, err = header.ReadFrom(src)
if err != nil {
return
}
err = verifyFileType(header)
if err != nil {
return
}
checksumStage := NewChecksumStage()
pipeline.AddStage(checksumStage)
pipeline.AddStage(NewCryptoStage(pass, header.IV[:]))
pipeline.AddStage(NewDechunkStage())
pipeline.AddStage(NewSourceStage(src))
_, err = io.Copy(dst, pipeline)
if err != nil {
return
}
err = pipeline.Close()
if err != nil {
return
}
_, err = footer.ReadFrom(src)
if err != nil {
return
}
err = verifyChecksum(footer.Checksum, checksumStage.Sum)
return
}