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path: root/sig.go
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package main

import (
	"fmt"
	"io/ioutil"

	"dim13.org/signify/ask"
	"dim13.org/signify/file"
	"dim13.org/signify/key"
)

func Sign(msgFile, encFile string, embed bool) error {
	encKey, err := OpenEnc(encFile)
	if err != nil {
		return err
	}
	body, err := ioutil.ReadFile(msgFile)
	if err != nil {
		return err
	}
	sig := encKey.Sign(body)
	sigRaw, err := key.Marshal(sig)
	if err != nil {
		return err
	}
	block := &file.Block{
		Comment: fmt.Sprintf("verify with %s", file.PubName(encFile)),
		Bytes:   sigRaw,
	}
	if embed {
		block.Message = body
	}
	if err := file.EncodeFile(msgFile+".sig", file.SigMode, block); err != nil {
		return err
	}
	return nil
}

func OpenEnc(fname string) (*key.Enc, error) {
	block, err := file.DecodeFile(fname)
	if err != nil {
		return nil, err
	}
	encKey := new(key.Enc)
	if err := key.Unmarshal(block.Bytes, encKey); err != nil {
		return nil, err
	}
	if err := Kdf(encKey, ask.Password); err != nil {
		return nil, err
	}
	if err := encKey.Check(); err != nil {
		return nil, err
	}
	return encKey, nil
}