/
pgp.go
55 lines (48 loc) · 1.49 KB
/
pgp.go
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// signFile reads the contents of an input file and signs it (in armored format)
// with the key provided, placing the signature into the output file.
package build
import (
"bytes"
"fmt"
"os"
"golang.org/x/crypto/openpgp"
)
// PGPSignFile parses a PGP private key from the specified string and creates a
// signature file into the output parameter of the input file.
//
// Note, this method assumes a single key will be container in the pgpkey arg,
// furthermore that it is in armored format.
func PGPSignFile(input string, output string, pgpkey string) error {
// Parse the keyring and make sure we only have a single private key in it
keys, err := openpgp.ReadArmoredKeyRing(bytes.NewBufferString(pgpkey))
if err != nil {
return err
}
if len(keys) != 1 {
return fmt.Errorf("key count mismatch: have %d, want %d", len(keys), 1)
}
// Create the input and output streams for signing
in, err := os.Open(input)
if err != nil {
return err
}
defer in.Close()
out, err := os.Create(output)
if err != nil {
return err
}
defer out.Close()
// Generate the signature and return
return openpgp.ArmoredDetachSign(out, keys[0], in, nil)
}
// PGPKeyID parses an armored key and returns the key ID.
func PGPKeyID(pgpkey string) (string, error) {
keys, err := openpgp.ReadArmoredKeyRing(bytes.NewBufferString(pgpkey))
if err != nil {
return "", err
}
if len(keys) != 1 {
return "", fmt.Errorf("key count mismatch: have %d, want %d", len(keys), 1)
}
return keys[0].PrimaryKey.KeyIdString(), nil
}