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/**
* autopasswd – On the fly password generator
*
* Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <passphrase.h>
#include "sha3.h"
/**
* Prompt string that tells you to enter your master passphrase
*/
#ifndef PASSPHRASE_PROMPT_STRING
# define PASSPHRASE_PROMPT_STRING "[autopasswd] Enter master passphrase: "
# warning: you should personalise PASSPHRASE_PROMPT_STRING.
#endif
/**
* Prompt string that tells you to enter site
*/
#ifndef SITE_PROMPT_STRING
# define SITE_PROMPT_STRING "[autopasswd] Enter site: "
#endif
#ifndef KECCAK_OUTPUT
# define KECCAK_OUTPUT 512
#endif
#ifndef KECCAK_BITRATE
# define KECCAK_BITRATE (KECCAK_OUTPUT * 2)
#endif
#ifndef KECCAK_CAPACITY
# define KECCAK_CAPACITY (1600 - KECCAK_BITRATE)
#endif
#ifndef KECCAK_SQUEEZES
# define KECCAK_SQUEEZES 300000
#endif
#define KECCAK_BYTE_OUTPUT ((KECCAK_OUTPUT + 7) / 8)
#ifndef BASE64
# define BASE64 "0123456789qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM,.-="
#endif
int main(int argc, char** argv)
{
size_t ptr = 0;
size_t site_size = 64;
char* site;
char* passphrase;
uint8_t* digest;
char* base64;
size_t ptr64;
/* Read site. */
site = malloc(site_size * sizeof(char));
if (site == NULL)
{
perror(*argv);
return 1;
}
fprintf(stderr, "%s", SITE_PROMPT_STRING);
fflush(stderr);
for (;;)
{
int c = getchar();
if (c == -1)
{
free(site);
return 0;
}
if (c == '\n')
{
*(site + ptr) = 0;
break;
}
*(site + ptr++) = (char)c;
}
/* Disable echoing. (Should be done as soon as possible.) */
passphrase_disable_echo();
/* Initialise Keccak sponge. */
sha3_initialise(KECCAK_BITRATE, KECCAK_CAPACITY, KECCAK_OUTPUT);
/* Read passphrease. */
fprintf(stderr, "%s", PASSPHRASE_PROMPT_STRING);
fflush(stderr);
passphrase = passphrase_read();
if (passphrase == NULL)
{
perror(*argv);
passphrase_reenable_echo();
sha3_dispose();
free(site);
return 1;
}
/* Reset terminal settings. */
passphrase_reenable_echo();
/* Add passphrase to Keccak sponge input. */
sha3_update(passphrase, strlen(passphrase));
/* Clear passphrase from memory. (Should be done as sone as possible.) */
memset(passphrase, 0, strlen(passphrase));
free(passphrase);
/* Add site to Keccak sponge input. */
sha3_digest(site, strlen(site), 0);
/* Release resources. */
free(site);
/* Squeeze that sponge. */
sha3_fastSqueeze(KECCAK_SQUEEZES);
digest = sha3_squeeze();
/* Release resources. */
sha3_dispose();
/* Encode with base64 (no invalid character, shorter than hexadecimal.) */
base64 = malloc((4 * ((KECCAK_BYTE_OUTPUT + 2) / 3) + 2) * sizeof(char));
if (base64 == NULL)
{
perror(*argv);
free(digest);
free(base64);
}
for (ptr = ptr64 = 0; ptr < KECCAK_BYTE_OUTPUT; ptr64 += 4)
{
uint32_t a = ptr < KECCAK_BYTE_OUTPUT ? digest[ptr++] : 0;
uint32_t b = ptr < KECCAK_BYTE_OUTPUT ? digest[ptr++] : 0;
uint32_t c = ptr < KECCAK_BYTE_OUTPUT ? digest[ptr++] : 0;
uint32_t abc = (a << 16) | (b << 8) | (c << 0);
base64[ptr64 | 0] = BASE64[(abc >> (3 * 6)) & 63];
base64[ptr64 | 1] = BASE64[(abc >> (2 * 6)) & 63];
base64[ptr64 | 2] = BASE64[(abc >> (1 * 6)) & 63];
base64[ptr64 | 3] = BASE64[(abc >> (0 * 6)) & 63];
}
if ((KECCAK_BYTE_OUTPUT % 3) == 1) base64[ptr64++] = BASE64[64];
if ((KECCAK_BYTE_OUTPUT % 3) == 2) base64[ptr64++] = BASE64[65];
base64[ptr64++] = 0;
/* Print generated password. */
printf("\033[00m>\033[00;30;40m%s\033[00m<\n", base64);
/* Release resources. */
free(digest);
free(base64);
return 0;
}
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