34 lines
734 B
C
34 lines
734 B
C
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/*
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This file is for evaluating a polynomial at one or more field elements
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*/
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#include "root.h"
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#include "params.h"
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/* input: polynomial f and field element a */
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/* return f(a) */
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gf PQCLEAN_MCELIECE348864F_CLEAN_eval(gf *f, gf a) {
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int i;
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gf r;
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r = f[ SYS_T ];
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for (i = SYS_T - 1; i >= 0; i--) {
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r = PQCLEAN_MCELIECE348864F_CLEAN_gf_mul(r, a);
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r = PQCLEAN_MCELIECE348864F_CLEAN_gf_add(r, f[i]);
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}
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return r;
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}
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/* input: polynomial f and list of field elements L */
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/* output: out = [ f(a) for a in L ] */
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void PQCLEAN_MCELIECE348864F_CLEAN_root(gf *out, gf *f, gf *L) {
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int i;
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for (i = 0; i < SYS_N; i++) {
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out[i] = PQCLEAN_MCELIECE348864F_CLEAN_eval(f, L[i]);
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}
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}
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