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Monorepo for Tangled
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1.1 kB · 42 lines
Go
at ci
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import ( "bytes" "crypto/sha256" "encoding/base64" "fmt"
"github.com/hiddeco/sshsig" "golang.org/x/crypto/ssh")
func VerifySignature(pubKey, signature, payload []byte) (error, bool) { pub, _, _, _, err := ssh.ParseAuthorizedKey(pubKey) if err != nil { return fmt.Errorf("failed to parse public key: %w", err), false }
sig, err := sshsig.Unarmor(signature) if err != nil { return fmt.Errorf("failed to parse signature: %w", err), false }
buf := bytes.NewBuffer(payload) // we use sha-512 because ed25519 keys require it internally; rsa keys support // multiple algorithms but sha-512 is most secure, and git's ssh signing defaults // to sha-512 for all key types anyway. err = sshsig.Verify(buf, sig, pub, sshsig.HashSHA512, "git")
return err, err == nil}
// SSHFingerprint computes the fingerprint of the supplied ssh pubkey.func SSHFingerprint(pubKey string) (string, error) { pk, _, _, _, err := ssh.ParseAuthorizedKey([]byte(pubKey)) if err != nil { return "", err }
hash := sha256.Sum256(pk.Marshal()) return "SHA256:" + base64.StdEncoding.EncodeToString(hash[:]), nil}