privateKey 
  The contents of the private key in PEM-encoded format.
The regex pattern used to validate this parameter is a string of characters consisting of the following:
- Any printable ASCII character ranging from the space character ( - \u0020) through the end of the ASCII character range
- The printable characters in the Basic Latin and Latin-1 Supplement character set (through - \u00FF)
- The special characters tab ( - \u0009), line feed (- \u000A), and carriage return (- \u000D)