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/*
* Copyright (c) 2012 Tim Ruehsen
* Copyright (c) 2015-2024 Free Software Foundation, Inc.
*
* This file is part of libwget.
*
* Libwget is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Libwget is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with libwget. If not, see <https://www.gnu.org/licenses/>.
*
*
* Digest/hash helper routines
*
* 21.12.2012 Tim Ruehsen created
*
*/
#include <config.h>
#include <stddef.h>
#include <wget.h>
#include "private.h"
/**
* \file
* \brief Hash convenience functions
* \defgroup libwget-hash Hash convenience functions
* @{
*
* Provides Hash helper functions
*/
/**
* \param[in] algorithm The hash algorithm to use
* \param[out] out Output string buffer
* \param[in] outsize Size of output string buffer
* \param[in] fmt Printf-like format specifier
* \param[in] ... List of arguments
*
* Calculate the hash from the string generated via the
* printf-style \p fmt and the following arguments and place it as hexadecimal string
* into \p out.
*
* The ideal length of \p out would be wget_hash_get_len(type) * 2 + 1.
*/
void wget_hash_printf_hex(wget_digest_algorithm algorithm, char *out, size_t outsize, const char *fmt, ...)
{
char *plaintext = NULL;
va_list args;
size_t len;
va_start(args, fmt);
len = wget_vasprintf(&plaintext, fmt, args);
va_end(args);
if (!plaintext)
return;
unsigned char tmp[256], *digest = tmp;
size_t digestlen = wget_hash_get_len(algorithm);
if (digestlen > sizeof(tmp)) {
digest = wget_malloc(digestlen);
}
if (digest) {
int rc;
if ((rc = wget_hash_fast(algorithm, plaintext, len, digest)) == 0) {
wget_memtohex(digest, digestlen, out, outsize);
} else {
*out = 0;
error_printf(_("Failed to hash (%d)\n"), rc);
}
if (digest != tmp)
xfree(digest);
} else {
error_printf(_("%s: Failed to malloc %zu bytes\n"), __func__, digestlen);
}
xfree(plaintext);
}
/**@}*/
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