Merge pull request #1735 from SgtCoDFish/csi-driver-key-algos

Document new csi-driver feature for custom key algos

Author: cert-manager-prow[bot]

content/docs/usage/csi-driver/README.md

@@ -85,6 +85,9 @@ values available through the cert-manager API. It currently supports the followi
 | `csi.cert-manager.io/issuer-name`       | The Issuer name to sign the certificate request.                                                                               |                                      | `ca-issuer`                      |
 | `csi.cert-manager.io/issuer-kind`       | The Issuer kind to sign the certificate request.                                                                               | `Issuer`                             | `ClusterIssuer`                  |
 | `csi.cert-manager.io/issuer-group`      | The group name the Issuer belongs to.                                                                                          | `cert-manager.io`                    | `out.of.tree.foo`                |
+| `csi.cert-manager.io/key-algorithm`     | Certificate key algorithm, one of "RSA", "ECDSA" and "Ed25519"                                                                 | `RSA`                                | `ECDSA`                          |
+| `csi.cert-manager.io/key-size`          | Size of key to generate. For RSA, between 2048-4096. For ECDSA, must be one of 256, 384 or 521. Ignored for Ed25519.           | `2048` for RSA, `256` for ECDSA      | `4096`                           |
+| `csi.cert-manager.io/key-encoding`      | Format for generated private key; must be one of `PKCS1` and `PKCS8`.                                                          | `PKCS1` for RSA, `PKCS8` otherwise   | `PKCS8`                          |
 | `csi.cert-manager.io/common-name`       | Certificate common name (supports variables).                                                                                  |                                      | `my-cert.foo`                    |
 | `csi.cert-manager.io/dns-names`         | DNS names the certificate will be requested for. At least a DNS Name, IP or URI name must be present (supports variables).     |                                      | `a.b.foo.com,c.d.foo.com`        |
 | `csi.cert-manager.io/ip-sans`           | IP addresses the certificate will be requested for.                                                                            |                                      | `192.0.0.1,192.0.0.2`            |