Read a narinfo from PORT. If URL is true, it must be a string used to build full URIs from relative URIs found while reading PORT. When SIZE is true, read at most SIZE bytes from PORT; otherwise, read as much as possible.

No authentication and authorization checks are performed here!

Return true if NARINFO1 and NARINFO2 are equivalent--i.e., if they describe the same store item. This ignores unnecessary metadata such as the Nar URL.

Return the sorted list of "preferred" nar URIs from NARINFO (preferred comes first) where each entry is a tuple containing: the URI, its compression method (a string), and the compressed file size.

When FAST-DECOMPRESSION? is true, prefer substitutes with faster decompression (typically zstd) rather than substitutes with a higher compression ratio (typically lzip).

Select the "best" URI to download NARINFO's nar, and return three values: the URI, its compression method (a string), and the compressed file size.

When FAST-DECOMPRESSION? is true, prefer substitutes with faster decompression (typically zstd) rather than substitutes with a higher compression ratio (typically lzip).

Return the external representation of NARINFO.

Write NARINFO to PORT.

If the string HASH denotes a sha256 hash, return it as a bytevector. Otherwise return #f.

Return two values: the first key with ID in KEYRING, and a list of associated packets (user IDs, signatures, etc.). Return #f and the empty list of ID was not found. ID must be the 64-bit key ID of the key, an integer.

Return a string representing BV, a bytevector, in the conventional OpenPGP hexadecimal format for fingerprints.

Verify that the data read from DATAPORT matches SIG, an <openpgp-signature>. Fetch the public key of the issuer of SIG from KEYRING, a keyring as returned by 'get-openpgp-keyring'. Return two values: a status symbol, such as 'bad-signature or 'missing-key, and additional info, such as the issuer's OpenPGP public key extracted from KEYRING.