What Are Private TLS Keys?
When uploading your own TLS certificates to ngrok, you must also upload a private key.
You can do so with the private_key_pem field when uploading a TLS certificate with the API.
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Accepted formats
ngrok accepts the following private key formats:
- RSA, in either
PKCS#1orPKCS#8form. - ECDSA, in either
SEC 1orPKCS#8form. - Ed25519, in PKCS#8 form.
Regardless of the format you choose, the private key must be formatted as ASN.1 DER, encoded as PEM.
Encryption
ngrok will not accept any private keys that are encrypted (e.g. with DES).
ngrok encrypts your uploaded private keys at rest with NaCL.