Read STR, an ASCII-armored OpenPGP packet, and return the corresponding OpenPGP record.

Return two values: the key with FINGERPRINT in KEYRING, and a list of associated packets (user IDs, signatures, etc.). Return #f and the empty list of FINGERPRINT was not found. FINGERPRINT must be a bytevector.

Read from PORT an ASCII-armored detached signature. Return an <openpgp-signature> record or the end-of-file object. Raise an error if the data read from PORT does is invalid or does not correspond to a detached signature.

Read from PORT an OpenPGP keyring in binary format; return a keyring based on all the OpenPGP primary keys that were read. The returned keyring complements KEYRING. LIMIT is the maximum number of keys to read, or -1 if there is no limit.

Read from PORT an ASCII-armored Radix-64 stream, decode it, and return the result as a bytevector as well as the type, a string such as "PGP MESSAGE". Return #f if PORT does not contain a valid Radix-64 stream, and the end-of-file object if the Radix-64 sequence was truncated.