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#include "config.h"
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <openssl/sha.h>
#include <openssl/rand.h>
#define PASSSIZE 4
int uw_hash_blocksize = 32;
static int password[PASSSIZE];
char *uw_sig_file = NULL;
static void random_password() {
if (!RAND_bytes((unsigned char *)password, sizeof password)) {
fprintf(stderr, "Error generating random password\n");
perror("RAND_bytes");
exit(1);
}
}
void uw_init_crypto() {
if (uw_sig_file) {
int fd;
if (access(uw_sig_file, F_OK)) {
random_password();
if ((fd = open(uw_sig_file, O_WRONLY | O_CREAT, 0700)) < 0) {
fprintf(stderr, "Can't open signature file %s\n", uw_sig_file);
perror("open");
exit(1);
}
if (write(fd, &password, sizeof password) != sizeof password) {
fprintf(stderr, "Error writing signature file\n");
exit(1);
}
close(fd);
} else {
if ((fd = open(uw_sig_file, O_RDONLY)) < 0) {
fprintf(stderr, "Can't open signature file %s\n", uw_sig_file);
perror("open");
exit(1);
}
if (read(fd, &password, sizeof password) != sizeof password) {
fprintf(stderr, "Error reading signature file\n");
exit(1);
}
close(fd);
}
} else
random_password();
}
void uw_sign(const char *in, unsigned char *out) {
SHA256_CTX c;
SHA256_Init(&c);
SHA256_Update(&c, password, sizeof password);
SHA256_Update(&c, in, strlen(in));
SHA256_Final(out, &c);
}
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