1/* 2 * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#ifdef HAVE_CONFIG_H 35#include "config.h" 36RCSID("$Id$"); 37#endif 38 39#include "otp_locl.h" 40 41extern const char *const std_dict[]; 42 43unsigned 44otp_checksum (OtpKey key) 45{ 46 int i; 47 unsigned sum = 0; 48 49 for (i = 0; i < OTPKEYSIZE; ++i) 50 sum += ((key[i] >> 0) & 0x03) 51 + ((key[i] >> 2) & 0x03) 52 + ((key[i] >> 4) & 0x03) 53 + ((key[i] >> 6) & 0x03); 54 sum &= 0x03; 55 return sum; 56} 57 58void 59otp_print_stddict (OtpKey key, char *str, size_t sz) 60{ 61 unsigned sum; 62 63 sum = otp_checksum (key); 64 snprintf (str, sz, 65 "%s %s %s %s %s %s", 66 std_dict[(key[0] << 3) | (key[1] >> 5)], 67 std_dict[((key[1] & 0x1F) << 6) | (key[2] >> 2)], 68 std_dict[((key[2] & 0x03) << 9) | (key[3] << 1) | (key[4] >> 7)], 69 std_dict[((key[4] & 0x7F) << 4) | (key[5] >> 4)], 70 std_dict[((key[5] & 0x0F) << 7) | (key[6] >> 1)], 71 std_dict[((key[6] & 0x01) << 10) | (key[7] << 2) | sum]); 72} 73 74void 75otp_print_hex (OtpKey key, char *str, size_t sz) 76{ 77 snprintf (str, sz, 78 "%02x%02x%02x%02x%02x%02x%02x%02x", 79 key[0], key[1], key[2], key[3], 80 key[4], key[5], key[6], key[7]); 81} 82 83void 84otp_print_hex_extended (OtpKey key, char *str, size_t sz) 85{ 86 strlcpy (str, OTP_HEXPREFIX, sz); 87 otp_print_hex (key, 88 str + strlen(OTP_HEXPREFIX), 89 sz - strlen(OTP_HEXPREFIX)); 90} 91 92void 93otp_print_stddict_extended (OtpKey key, char *str, size_t sz) 94{ 95 strlcpy (str, OTP_WORDPREFIX, sz); 96 otp_print_stddict (key, 97 str + strlen(OTP_WORDPREFIX), 98 sz - strlen(OTP_WORDPREFIX)); 99} 100