43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
/* LibTomPoly, Polynomial Basis Math -- Tom St Denis
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*
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* LibTomPoly is a public domain library that provides
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* polynomial basis arithmetic support. It relies on
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* LibTomMath for large integer support.
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*
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* This library is free for all purposes without any
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* express guarantee that it works.
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*
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* Tom St Denis, tomstdenis@iahu.ca, http://poly.libtomcrypt.org
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*/
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#include <tompoly.h>
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int pb_toraw(pb_poly *a, unsigned char *dst)
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{
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int err, x, y, z;
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/* store the # of terms */
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dst[0] = a->used & 255;
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dst[1] = (a->used >> 8) & 255;
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y = 2;
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/* store the characteristic */
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z = mp_signed_bin_size(&(a->characteristic));
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dst[y++] = z&255;
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dst[y++] = (z>>8)&255;
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if ((err = mp_to_signed_bin(&(a->characteristic), dst+y)) != MP_OKAY) { return err; }
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y += z;
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for (x = 0; x < a->used; x++) {
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z = mp_signed_bin_size(&(a->terms[x]));
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dst[y++] = z&255;
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dst[y++] = (z>>8)&255;
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if ((err = mp_to_signed_bin(&(a->terms[x]), dst+y)) != MP_OKAY) { return err; }
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y += z;
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}
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return MP_OKAY;
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}
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