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82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
/*
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* Copyright (c) 2012 Tim Ruehsen
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* Copyright (c) 2015-2022 Free Software Foundation, Inc.
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*
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* This file is part of libwget.
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*
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* Libwget is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Libwget is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with libwget. If not, see <https://www.gnu.org/licenses/>.
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*
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*
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* Digest/hash helper routines
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*
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* 21.12.2012 Tim Ruehsen created
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*
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*/
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#include <config.h>
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#include <stddef.h>
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#include <wget.h>
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#include "private.h"
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/**
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* \file
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* \brief Hash convenience functions
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* \defgroup libwget-hash Hash convenience functions
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* @{
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*
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* Provides Hash helper functions
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*/
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/**
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* \param[in] algorithm The hash algorithm to use
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* \param[out] out Output string buffer
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* \param[in] outsize Size of output string buffer
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* \param[in] fmt Printf-like format specifier
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* \param[in] ... List of arguments
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*
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* Calculate the hash from the string generated via the
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* printf-style \p fmt and the following arguments and place it as hexadecimal string
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* into \p out.
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*
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* The ideal length of \p out would be wget_hash_get_len(type) * 2 + 1.
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*/
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void wget_hash_printf_hex(wget_digest_algorithm algorithm, char *out, size_t outsize, const char *fmt, ...)
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{
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char *plaintext = NULL;
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va_list args;
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size_t len;
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va_start(args, fmt);
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len = wget_vasprintf(&plaintext, fmt, args);
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va_end(args);
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if (plaintext) {
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unsigned char digest[wget_hash_get_len(algorithm)];
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int rc;
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if ((rc = wget_hash_fast(algorithm, plaintext, len, digest)) == 0) {
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wget_memtohex(digest, sizeof(digest), out, outsize);
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} else {
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*out = 0;
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error_printf(_("Failed to hash (%d)\n"), rc);
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}
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xfree(plaintext);
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}
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}
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/**@}*/
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