1 /* 2 * WPA Supplicant - ASCII passphrase to WPA PSK tool 3 * Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "includes.h" 10 #include <termios.h> 11 12 #include "common.h" 13 #include "crypto/sha1.h" 14 15 16 int main(int argc, char *argv[]) 17 { 18 struct termios term; 19 unsigned char psk[32]; 20 int i; 21 char *ssid, *passphrase, buf[64], *pos; 22 size_t len; 23 24 if (argc < 2) { 25 printf("usage: wpa_passphrase <ssid> [passphrase]\n" 26 "\nIf passphrase is left out, it will be read from " 27 "stdin\n"); 28 return 1; 29 } 30 31 ssid = argv[1]; 32 33 if (argc > 2) { 34 passphrase = argv[2]; 35 } else { 36 bool ctrl_echo; 37 38 fprintf(stderr, "# reading passphrase from stdin\n"); 39 if (tcgetattr(STDIN_FILENO, &term) < 0) { 40 perror("tcgetattr"); 41 return 1; 42 } 43 ctrl_echo = term.c_lflag & ECHO; 44 term.c_lflag &= ~ECHO; 45 if (ctrl_echo && tcsetattr(STDIN_FILENO, TCSANOW, &term) < 0) { 46 perror("tcsetattr:error disabling echo"); 47 return 1; 48 } 49 if (fgets(buf, sizeof(buf), stdin) == NULL) { 50 fprintf(stderr, "Failed to read passphrase\n"); 51 return 1; 52 } 53 term.c_lflag |= ECHO; 54 if (ctrl_echo && tcsetattr(STDIN_FILENO, TCSANOW, &term) < 0) { 55 perror("tcsetattr:error enabling echo"); 56 return 1; 57 } 58 buf[sizeof(buf) - 1] = '\0'; 59 pos = buf; 60 while (*pos != '\0') { 61 if (*pos == '\r' || *pos == '\n') { 62 *pos = '\0'; 63 break; 64 } 65 pos++; 66 } 67 passphrase = buf; 68 } 69 70 len = os_strlen(passphrase); 71 if (len < 8 || len > 63) { 72 fprintf(stderr, "Passphrase must be 8..63 characters\n"); 73 return 1; 74 } 75 if (has_ctrl_char((u8 *) passphrase, len)) { 76 fprintf(stderr, "Invalid passphrase character\n"); 77 return 1; 78 } 79 80 if (pbkdf2_sha1(passphrase, (u8 *) ssid, os_strlen(ssid), 4096, psk, 32) 81 != 0) { 82 fprintf(stderr, "Error in pbkdf2_sha1()\n"); 83 return 1; 84 } 85 86 printf("network={\n"); 87 printf("\tssid=\"%s\"\n", ssid); 88 printf("\t#psk=\"%s\"\n", passphrase); 89 printf("\tpsk="); 90 for (i = 0; i < 32; i++) 91 printf("%02x", psk[i]); 92 printf("\n"); 93 printf("}\n"); 94 95 return 0; 96 } 97