adamc@1268: #include "config.h"
adamc@1268: 
adam@1368: #include <stdlib.h>
adam@1368: #include <unistd.h>
adam@1368: #include <sys/types.h>
adam@1368: #include <sys/stat.h>
adamc@1145: #include <fcntl.h>
adam@1368: #include <stdio.h>
adam@1368: #include <string.h>
adamc@1104: 
adam@1368: #include <openssl/sha.h>
adam@2105: #include <openssl/rand.h>
adam@1368: 
adamc@1104: #define PASSSIZE 4
adamc@1104: 
adam@1368: int uw_hash_blocksize = 32;
adamc@1104: 
adamc@1104: static int password[PASSSIZE];
adamc@1104: 
adamc@1145: char *uw_sig_file = NULL;
adamc@1145: 
adamc@1145: static void random_password() {
adam@2105:   if (!RAND_bytes((unsigned char *)password, sizeof password)) {
adam@2105:     fprintf(stderr, "Error generating random password\n");
adam@2105:     perror("RAND_bytes");
adam@2105:     exit(1);
adam@2105:   }
adamc@1145: }
adamc@1145: 
adamc@1104: void uw_init_crypto() {
adamc@1145:   if (uw_sig_file) {
adamc@1145:     int fd;
adamc@1145: 
adamc@1155:     if (access(uw_sig_file, F_OK)) {
adamc@1145:       random_password();
adamc@1145:       
adamc@1145:       if ((fd = open(uw_sig_file, O_WRONLY | O_CREAT, 0700)) < 0) {
adamc@1145:         fprintf(stderr, "Can't open signature file %s\n", uw_sig_file);
adamc@1145:         perror("open");
adamc@1145:         exit(1);
adamc@1145:       }
adamc@1145: 
adamc@1145:       if (write(fd, &password, sizeof password) != sizeof password) {
adamc@1145:         fprintf(stderr, "Error writing signature file\n");
adamc@1145:         exit(1);
adamc@1145:       }
adamc@1145: 
adamc@1145:       close(fd);
adamc@1145:     } else {
adamc@1145:       if ((fd = open(uw_sig_file, O_RDONLY)) < 0) {
adamc@1145:         fprintf(stderr, "Can't open signature file %s\n", uw_sig_file);
adamc@1145:         perror("open");
adamc@1145:         exit(1);
adamc@1145:       }
adamc@1145: 
adamc@1145:       if (read(fd, &password, sizeof password) != sizeof password) {
adamc@1145:         fprintf(stderr, "Error reading signature file\n");
adamc@1145:         exit(1);
adamc@1145:       }
adamc@1145: 
adamc@1145:       close(fd);
adamc@1145:     }
adamc@1145:   } else
adamc@1145:     random_password();
adamc@1104: }
adamc@1104: 
adam@1368: void uw_sign(const char *in, unsigned char *out) {
adam@1368:   SHA256_CTX c;
adamc@1104: 
adam@1368:   SHA256_Init(&c);
adam@1368:   SHA256_Update(&c, password, sizeof password);
adam@1368:   SHA256_Update(&c, in, strlen(in));
adam@1368:   SHA256_Final(out, &c);
adamc@1104: }