| 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_constants.h 679 2013-03-18 21:38:58Z des $ |
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| 30 | */ |
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| 31 | |
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| 32 | #ifndef OATH_CONSTANTS_H_INCLUDED |
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| 33 | #define OATH_CONSTANTS_H_INCLUDED |
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| 34 | |
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| 35 | /* |
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| 36 | * OATH modes |
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| 37 | */ |
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| 38 | enum oath_mode { |
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| 39 | om_undef, /* not set / default */ |
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| 40 | om_hotp, /* RFC 4226 HOTP */ |
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| 41 | om_totp, /* RFC 6238 TOTP */ |
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| 42 | om_max |
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| 43 | }; |
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| 44 | |
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| 45 | /* |
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| 46 | * Hash functions |
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| 47 | */ |
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| 48 | enum oath_hash { |
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| 49 | oh_undef, /* not set / default */ |
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| 50 | oh_md5, /* RFC 1321 MD5 */ |
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| 51 | oh_sha1, /* FIPS 180 SHA-1 */ |
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| 52 | oh_sha256, /* FIPS 180 SHA-256 */ |
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| 53 | oh_sha512, /* FIPS 180 SHA-512 */ |
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| 54 | oh_max |
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| 55 | }; |
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| 56 | |
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| 57 | /* |
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| 58 | * Default time step for TOTP: 30 seconds. |
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| 59 | */ |
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| 60 | #define OATH_DEF_TIMESTEP 30 |
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| 61 | |
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| 62 | /* |
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| 63 | * Maximum time step for TOTP: 10 minutes, which RFC 6238 cites as an |
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| 64 | * example of an unreasonably large time step. |
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| 65 | */ |
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| 66 | #define OATH_MAX_TIMESTEP 600 |
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| 67 | |
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| 68 | /* |
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| 69 | * Maximum key length in bytes. HMAC has a 64-byte block size; if the key |
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| 70 | * K is longer than that, HMAC derives a new key K' = H(K). |
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| 71 | */ |
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| 72 | #define OATH_MAX_KEYLEN 64 |
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| 73 | |
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| 74 | /* |
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| 75 | * Maximum label length in characters, including terminating NUL. |
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| 76 | */ |
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| 77 | #define OATH_MAX_LABELLEN 64 |
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| 78 | |
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| 79 | /* |
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| 80 | * Label to use for dummy keys |
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| 81 | */ |
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| 82 | #define OATH_DUMMY_LABEL "oath-dummy-key" |
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| 83 | |
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| 84 | #endif |
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