Strip leading and trailing whitespace from SSH keys in validate_ssh_private_key()
to handle common copy-paste scenarios where hidden newlines cause base64 decoding
failures.
Changes:
- Added data.strip() in validate_ssh_private_key() before calling validate_pem()
- Added test_ssh_key_with_whitespace() to verify keys with leading/trailing
newlines are properly sanitized and validated
This prevents the confusing "HTTP 500: Internal Server Error" and
"binascii.Error: Incorrect padding" errors when users paste SSH keys with
accidental whitespace.
Fixes#14219
Signed-off-by: Joey Washburn <joey@joeywashburn.com>
