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/*
hmackeys.c: convenience utility for generating good
HMAC keys.
*/
/* */
/* Copyright (c) 2009, California Institute of Technology. */
/* All rights reserved. */
/* Author: Scott Burleigh, Jet Propulsion Laboratory */
/* */
#include "platform.h"
static int processLine(char *line, int lineLength)
{
char fileName[256];
int fd;
int i;
int val;
unsigned char key[20];
int result = 0;
if (*line == '#') /* Comment. */
{
return 0;
}
if (strcmp(line, "q") == 0)
{
return 1;
}
isprintf(fileName, sizeof fileName, "./%.80s.hmk", line);
fd = iopen(fileName, O_RDWR | O_CREAT, 0777);
if (fd < 0)
{
printf("Can't create file '%s': %s\n", fileName,
system_error_msg());
return -1;
}
for (i = 0; i < 20; i++)
{
val = rand();
key[i] = val & 0xff;
}
if (write(fd, key, 20) < 20)
{
printf("Can't write key to %s: %s\n", fileName,
system_error_msg());
result = -1;
}
close(fd);
return result;
}
int main(int argc, char **argv)
{
char *cmdFileName = (argc > 1 ? argv[1] : NULL);
int cmdFile;
char line[80];
int len;
srand(time(NULL));
if (cmdFileName == NULL) /* Interactive. */
{
cmdFile = fileno(stdin);
while (1)
{
printf(": ");
fflush(stdout);
if (igets(cmdFile, line, sizeof line, &len) == NULL)
{
if (len == 0)
{
break;
}
putErrmsg("igets failed.", NULL);
break; /* Out of loop. */
}
if (len == 0)
{
continue;
}
if (processLine(line, len))
{
break; /* Out of loop. */
}
}
}
else /* Scripted. */
{
cmdFile = iopen(cmdFileName, O_RDONLY, 0777);
if (cmdFile < 0)
{
PERROR("Can't open keynames file");
}
else
{
while (1)
{
if (igets(cmdFile, line, sizeof line, &len)
== NULL)
{
if (len == 0)
{
break; /* Loop. */
}
putErrmsg("igets failed.", NULL);
break; /* Loop. */
}
if (len == 0
|| line [0] == '#') /* Comment.*/
{
continue;
}
if (processLine(line, len))
{
break; /* Out of loop. */
}
}
close(cmdFile);
}
}
PUTS("Stopping hmackeys.");
return 0;
}
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