The PEM format is a standard certificate format that is Base64 encoded.
An example of a PEM-format certificate is as follows:
-----BEGIN CERTIFICATE----- MIIDojCCAwugAwIBAgIJAMLM0CJRzPyzMA0GCSqGSIb3DQEBBQUAMIGTMQswCQYD VQQGEwJVUzETMBEGA1UECBMKQ2FsaWZvcm5pYTESMBAGA1UEBxMJUGFsbyBBbHRv MS8wLQYDVQQKEyZWTXdhcmUsIEluYy4gLSBXb3Jrc3RhdGlvbiBTU0wgVGVzdGlu ZzEqMCgGA1UEAxMhV29ya3N0YXRpb24gQ2VydGlmaWNhdGUgQXV0aG9yaXR5MB4X DTExMDcxNTAyMjY0OFoXDTE1MDcxNDAyMjY0OFowgZMxCzAJBgNVBAYTAlVTMRMw EQYDVQQIEwpDYWxpZm9ybmlhMRIwEAYDVQQHEwlQYWxvIEFsdG8xLzAtBgNVBAoT JlZNd2FyZSwgSW5jLiAtIFdvcmtzdGF0aW9uIFNTTCBUZXN0aW5nMSowKAYDVQQD EyFXb3Jrc3RhdGlvbiBDZXJ0aWZpY2F0ZSBBdXRob3JpdHkwgZ8wDQYJKoZIhvcN AQEBBQADgY0AMIGJAoGBAL/tBlngiEkCK7ssCBe8lZ30FlIHmpECmwEm3AaID1C0 lncb+LdRt2AmmQiknXBPxGBGyRNRNnashrzp1XXR/wL2b2AybT7NX+P/XSH2srDb cGGCTNa/bwh/ArcirTLCjRwY55lAAH9xwzortRYR84IBJQpHzxcopTSI9o4ZVIqx AgMBAAGjgfswgfgwHQYDVR0OBBYEFMoT527dtvlgR1EzYK4EnQHS6T2ZMIHIBgNV HSMEgcAwgb2AFMoT527dtvlgR1EzYK4EnQHS6T2ZoYGZpIGWMIGTMQswCQYDVQQG EwJVUzETMBEGA1UECBMKQ2FsaWZvcm5pYTESMBAGA1UEBxMJUGFsbyBBbHRvMS8w LQYDVQQKEyZWTXdhcmUsIEluYy4gLSBXb3Jrc3RhdGlvbiBTU0wgVGVzdGluZzEq MCgGA1UEAxMhV29ya3N0YXRpb24gQ2VydGlmaWNhdGUgQXV0aG9yaXR5ggkAwszQ IlHM/LMwDAYDVR0TBAUwAwEB/zANBgkqhkiG9w0BAQUFAAOBgQBcoiwDWGWXzI+j 0gG/7BNzpNHzR1RGAF4nB9JrnCYWvB313kgYDMHogfiAoQchsu/py/OYBYVRjjFJ YVaTJ7DVl/3Gpk3+tcdJfEmqIz76PVWfWbTnhuJEMYrMM4W06B/K2cs24bkZtcXQ h8b4FYTVCg/l6TP5SWgei4VWgRfxgA== -----END CERTIFICATE-----
When you create a trusted certificates list, you concatenate multiple PEM-format certificates into a single file. Line endings are auto-detected. The following example shows the format of a concatenated certificates list that contains two certificates.
-----BEGIN CERTIFICATE----- <base64 content here> -----END CERTIFICATE----- -----BEGIN CERTIFICATE----- <base64 content here> -----END CERTIFICATE-----