/
check.go
71 lines (58 loc) · 1.79 KB
/
check.go
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package main
import (
"bytes"
"fmt"
"golang.org/x/crypto/openpgp"
"golang.org/x/crypto/openpgp/armor"
"golang.org/x/crypto/openpgp/packet"
"io"
"io/ioutil"
"os"
)
func exitOnError(err error, where string) {
if err != nil {
fmt.Fprintf(os.Stderr, "ERROR upon %s:\n%v\n", where, err)
os.Exit(1)
}
}
func main() {
var pubFile *os.File
var err error
if len(os.Args) != 3 {
fmt.Fprintf(os.Stderr, "Usage: %s <signature file> <public key file>\n", os.Args[0])
os.Exit(0)
}
sigFile, err := os.Open(os.Args[1])
exitOnError(err, "opening signature file")
sigBytes, err := ioutil.ReadAll(sigFile)
exitOnError(err, "reading stdin")
var entityList openpgp.EntityList
entityList = []*openpgp.Entity{}
pubFile, err = os.Open(os.Args[2])
exitOnError(err, "opening public key")
pubBytes, err := ioutil.ReadAll(pubFile)
exitOnError(err, fmt.Sprintf("reading from public key"))
pubFile.Close()
var pubReader *packet.Reader
block, err := armor.Decode(bytes.NewReader(pubBytes))
if err == nil {
pubReader = packet.NewReader(block.Body)
} else if err == io.EOF {
pubReader = packet.NewReader(bytes.NewReader(pubBytes))
} else {
exitOnError(err, fmt.Sprintf("decoding public key"))
}
pubEntity, err := openpgp.ReadEntity(pubReader)
exitOnError(err, fmt.Sprintf("reading entity from public key"))
entityList = append(entityList, pubEntity)
stdinBytes, err := ioutil.ReadAll(os.Stdin)
exitOnError(err, "reading stdin")
signer, err := openpgp.CheckArmoredDetachedSignature(entityList, bytes.NewReader(stdinBytes), bytes.NewReader(sigBytes))
if err == io.EOF {
signer, err = openpgp.CheckDetachedSignature(entityList, bytes.NewReader(stdinBytes), bytes.NewReader(sigBytes))
exitOnError(err, "verifying data")
} else {
exitOnError(err, "verifying armored data")
}
fmt.Println(signer)
}