1=pod 2 3=head1 NAME 4 5ossl_punycode_decode, ossl_a2ulabel, ossl_a2ucompare 6- internal punycode-related functions 7 8=head1 SYNOPSIS 9 10 #include "crypto/punycode.h" 11 12 int ossl_punycode_decode(const char *pEncoded, const size_t enc_len, 13 unsigned int *pDecoded, unsigned int *pout_length); 14 15 int ossl_a2ulabel(const char *in, char *out, size_t *outlen); 16 17 int ossl_a2ucompare(const char *a, const char *u); 18 19=head1 DESCRIPTION 20 21PUNYCODE encoding introduced in RFCs 3490-3492 is widely used for 22representation of host names in ASCII-only format. Some specifications, 23such as RFC 8398, require comparison of host names encoded in UTF-8 charset. 24 25ossl_a2ulabel() decodes NUL-terminated hostname from PUNYCODE to UTF-8, 26using a provided buffer for output. 27 28ossl_a2ucompare() accepts two NUL-terminated hostnames, decodes the 1st 29from PUNYCODE to UTF-8 and compares it with the 2nd one as is. 30 31ossl_punycode_decode() decodes one label (one dot-separated part) from 32a hostname, with stripped PUNYCODE marker I<xn-->. 33 34=head1 RETURN VALUES 35 36ossl_a2ulabel() returns 1 on success, 0 on not enough buf passed, 37-1 on invalid PUNYCODE string passed. When valid string is provided, it sets the 38I<*outlen> to the length of required buffer to perform correct decoding. 39 40ossl_a2ucompare() returns 1 on non-equal strings, 0 on equal strings, 41-1 when invalid PUNYCODE string passed. 42 43ossl_punycode_decode() returns 1 on success, 0 on error. On success, 44*pout_length contains the number of codepoints decoded. 45 46=head1 HISTORY 47 48The functions described here were all added in OpenSSL 3.0. 49 50=head1 COPYRIGHT 51 52Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved. 53 54Licensed under the Apache License 2.0 (the "License"). You may not use 55this file except in compliance with the License. You can obtain a copy 56in the file LICENSE in the source distribution or at 57L<https://www.openssl.org/source/license.html>. 58 59=cut 60 61