/
ssh_sign.go
38 lines (35 loc) · 1.2 KB
/
ssh_sign.go
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package ssh_jwt
import (
"encoding/base64"
"fmt"
"github.com/42wim/sshsig"
"golang.org/x/crypto/ssh/agent"
"strings"
)
func SignSSH(signingString, namespace, authorizedKey string, a agent.Agent) (string, error) {
if a == nil {
return "", fmt.Errorf("no SSH agent")
}
sig, err := sshsig.SignWithAgent([]byte(authorizedKey), a, strings.NewReader(signingString), namespace)
if err != nil {
return "", err
}
sigStr := strings.ReplaceAll(string(sig), "\n", "")
sigStr = strings.TrimPrefix(sigStr, "-----BEGIN SSH SIGNATURE-----")
sigStr = strings.TrimSuffix(sigStr, "-----END SSH SIGNATURE-----")
var sigDec []byte
sigDec, err = base64.StdEncoding.DecodeString(sigStr)
if err != nil {
return "", err
}
sigEnc := base64.RawURLEncoding.EncodeToString(sigDec)
return sigEnc, nil
}
func VerifySSHSignature(signingString, signature, namespace, authorizedKey string) error {
sigBytes, err := base64.RawURLEncoding.DecodeString(signature)
if err != nil {
return err
}
sigStr := "-----BEGIN SSH SIGNATURE-----\n" + base64.StdEncoding.EncodeToString(sigBytes) + "\n-----END SSH SIGNATURE-----\n"
return sshsig.Verify(strings.NewReader(signingString), []byte(sigStr), []byte(authorizedKey), namespace)
}