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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 * |
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9 * Tom St Denis, [email protected], http://libtomcrypt.com |
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10 */ |
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11 |
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12 /* Implements ECC over Z/pZ for curve y^2 = x^3 - 3x + b |
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13 * |
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14 * All curves taken from NIST recommendation paper of July 1999 |
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15 * Available at http://csrc.nist.gov/cryptval/dss.htm |
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16 */ |
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17 #include "tomcrypt.h" |
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18 |
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19 /** |
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20 @file ltc_ecc_is_valid_idx.c |
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21 ECC Crypto, Tom St Denis |
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22 */ |
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23 |
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24 #ifdef MECC |
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25 |
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26 /** Returns whether an ECC idx is valid or not |
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27 @param n The idx number to check |
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28 @return 1 if valid, 0 if not |
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29 */ |
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30 int ltc_ecc_is_valid_idx(int n) |
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31 { |
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32 int x; |
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33 |
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34 for (x = 0; ltc_ecc_sets[x].size != 0; x++); |
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35 /* -1 is a valid index --- indicating that the domain params were supplied by the user */ |
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36 if ((n >= -1) || (n < x)) { |
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37 return 1; |
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38 } |
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39 return 0; |
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40 } |
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41 |
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42 #endif |
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43 /* $Source: /cvs/libtom/libtomcrypt/src/pk/ecc/ltc_ecc_is_valid_idx.c,v $ */ |
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44 /* $Revision: 1.4 $ */ |
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45 /* $Date: 2006/11/21 00:10:18 $ */ |
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46 |
