1 | /*- |
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2 | * Copyright (c) 2012-2013 Universitetet i Oslo |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * 1. Redistributions of source code must retain the above copyright |
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9 | * notice, this list of conditions and the following disclaimer. |
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10 | * 2. Redistributions in binary form must reproduce the above copyright |
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11 | * notice, this list of conditions and the following disclaimer in the |
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12 | * documentation and/or other materials provided with the distribution. |
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13 | * 3. The name of the author may not be used to endorse or promote |
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14 | * products derived from this software without specific prior written |
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15 | * permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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27 | * SUCH DAMAGE. |
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28 | * |
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29 | * $Id: oath_totp.c 643 2013-03-05 15:24:00Z des $ |
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30 | */ |
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31 | |
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32 | #ifdef HAVE_CONFIG_H |
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33 | # include "config.h" |
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34 | #endif |
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35 | |
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36 | #include <stdint.h> |
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37 | #include <string.h> |
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38 | #include <time.h> |
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39 | |
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40 | #include "oath.h" |
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41 | |
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42 | #define TOTP_TIME_STEP 30 |
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43 | |
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44 | unsigned int |
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45 | oath_totp(const uint8_t *K, size_t Klen, unsigned int Digit) |
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46 | { |
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47 | time_t now; |
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48 | |
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49 | time(&now); |
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50 | return (oath_hotp(K, Klen, now / TOTP_TIME_STEP, Digit)); |
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51 | } |
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52 | |
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53 | unsigned int |
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54 | oath_totp_current(const struct oath_key *k) |
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55 | { |
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56 | unsigned int code; |
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57 | uint64_t seq; |
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58 | |
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59 | if (k == NULL) |
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60 | return (-1); |
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61 | if (k->mode != om_totp) |
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62 | return (-1); |
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63 | if (k->timestep == 0) |
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64 | return (-1); |
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65 | seq = time(NULL) / k->timestep; |
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66 | code = oath_hotp(k->key, k->keylen, seq, k->digits); |
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67 | return (code); |
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68 | } |
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69 | |
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70 | int |
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71 | oath_totp_match(const struct oath_key *k, unsigned int response, int window) |
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72 | { |
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73 | unsigned int code; |
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74 | uint64_t seq; |
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75 | int dummy; |
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76 | |
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77 | if (k == NULL) |
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78 | return (-1); |
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79 | if (window < 1) |
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80 | return (-1); |
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81 | if (k->mode != om_totp) |
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82 | return (-1); |
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83 | if (k->timestep == 0) |
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84 | return (-1); |
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85 | seq = time(NULL) / k->timestep; |
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86 | dummy = (memcmp(k->label, DUMMY_LABEL, DUMMY_LABELLEN) == 0); |
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87 | for (int i = -window; i <= window; ++i) { |
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88 | code = oath_hotp(k->key, k->keylen, seq + i, k->digits); |
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89 | if (code == response && !dummy) |
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90 | return (1); |
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91 | } |
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92 | return (0); |
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93 | } |
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