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Add SHA256 fingerprint utils and helpers (#41)

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wussler 2020-04-07 14:59:25 +02:00 • committed by GitHub
parent c8b7e87135
commit 3c79f40acb
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GPG key ID: 4AEE18F83AFDEB23
8 changed files with 88 additions and 3 deletions
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24
crypto/key.go
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@ -3,6 +3,7 @@ package crypto
import (
"bytes"
"crypto"
"crypto/sha256"
"encoding/hex"
"fmt"
"io"
@ -14,9 +15,9 @@ import (
"github.com/ProtonMail/gopenpgp/v2/constants"
"github.com/pkg/errors"
"golang.org/x/crypto/openpgp"
openpgp "golang.org/x/crypto/openpgp"
xarmor "golang.org/x/crypto/openpgp/armor"
"golang.org/x/crypto/openpgp/packet"
packet "golang.org/x/crypto/openpgp/packet"
)
// Key contains a single private or public key
@ -321,8 +322,27 @@ func (key *Key) GetFingerprint() string {
return hex.EncodeToString(key.entity.PrimaryKey.Fingerprint[:])
}
// GetSHA256Fingerprints computes the SHA256 fingerprints of the key and subkeys
func (key *Key) GetSHA256Fingerprints() (fingerprints []string) {
fingerprints = append(fingerprints, hex.EncodeToString(getSHA256FingerprintBytes(key.entity.PrimaryKey)))
for _, sub := range key.entity.Subkeys {
fingerprints = append(fingerprints, hex.EncodeToString(getSHA256FingerprintBytes(sub.PublicKey)))
}
return
}
// --- Internal methods
// getSHA256FingerprintBytes computes the SHA256 fingerprint of a public key object
func getSHA256FingerprintBytes(pk *packet.PublicKey) []byte {
fingerPrint := sha256.New()
// Hashing can't return an error, and has already been done when parsing the key,
// hence the error is nil
_ = pk.SerializeForHash(fingerPrint)
return fingerPrint.Sum(nil)
}
// readFrom reads unarmored and armored keys from r and adds them to the keyring.
func (key *Key) readFrom(r io.Reader, armored bool) error {
var err error