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decrypt.go
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/
decrypt.go
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package commands
import (
"crypto/aes"
"crypto/cipher"
"io"
"log"
"os"
"github.com/urfave/cli"
)
func Decrypt(ctx *cli.Context) (err error) {
key := []byte(ctx.Args().Get(0))
in := ctx.Args().Get(1)
out := ctx.Args().Get(2)
inFile, err := os.Open(in)
if err != nil {
log.Fatalln(err.Error())
return
}
defer inFile.Close()
block, err := aes.NewCipher(key)
if err != nil {
log.Fatalln(err.Error())
return
}
iv := make([]byte, 16)
_, err = inFile.Read(iv)
if err != nil {
log.Fatalln(err.Error())
return
}
stream := cipher.NewOFB(block, iv)
outFile, err := os.OpenFile(out, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
log.Fatalln(err.Error())
return
}
defer outFile.Close()
reader := &cipher.StreamReader{
S: stream,
R: inFile,
}
if _, err := io.Copy(outFile, reader); err != nil {
log.Fatalln(err.Error())
return err
}
return
}