Mercurial > dropbear

annotate libtommath/bn_mp_to_signed_bin.c @ 310:4b4478d0d2b9 ucc-axis-hack

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add a comment on usage
author Matt Johnston <matt@ucc.asn.au>
date Sun, 26 Mar 2006 08:28:16 +0000
parents eed26cff980b
children 5ff8218bcee9
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1 #include <tommath.h>
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2 #ifdef BN_MP_TO_SIGNED_BIN_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
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4 *
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5 * LibTomMath is a library that provides multiple-precision
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6 * integer arithmetic as well as number theoretic functionality.
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7 *
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8 * The library was designed directly after the MPI library by
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9 * Michael Fromberger but has been written from scratch with
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10 * additional optimizations in place.
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11 *
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12 * The library is free for all purposes without any express
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13 * guarantee it works.
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14 *
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15 * Tom St Denis, [email protected], http://math.libtomcrypt.org
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16 */
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17
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18 /* store in signed [big endian] format */
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19 int mp_to_signed_bin (mp_int * a, unsigned char *b)
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20 {
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21 int res;
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22
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23 if ((res = mp_to_unsigned_bin (a, b + 1)) != MP_OKAY) {
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24 return res;
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25 }
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26 b[0] = (unsigned char) ((a->sign == MP_ZPOS) ? 0 : 1);
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27 return MP_OKAY;
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28 }
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29 #endif