• X509: always parse the first cert of a bundle (#1568)
• SSH2: behave like putty with broken publickey auth (#1572)
• SSH2: don't close channel on unexpected response to channel request (#1631)
• RSA: support keys with PSS algorithm identifier (#1584)
• RSA: cleanup RSA PKCS#1 v1.5 signature verification (CVE-2021-30130)
• SFTP/Stream: make it so you can write past the end of a file (#1618)
• SFTP: fix undefined index notice in stream touch() (#1615)
• SFTP: digit only filenames were converted to integers by php (#1623)
• BigInteger: fix issue with toBits on 32-bit PHP 8 installs
• Crypt: use a custom error handler for mcrypt to avoid deprecation errors