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41 lines
1.8 KiB
C
41 lines
1.8 KiB
C
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#ifndef MQDSS_GF31_H
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#define MQDSS_GF31_H
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#include <stddef.h>
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#include <stdint.h>
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typedef uint16_t gf31;
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/* This performs a full unique reduction mod 13 on x; x can be any unsigned
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16-bit integer (i.e. in the range [0, 65535]) */
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gf31 PQCLEAN_MQDSS64_CLEAN_mod31(gf31 x);
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/* Given a vector of elements in the range [0, 31], this reduces the elements
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to the range [0, 30] by mapping 31 to 0 (i.e reduction mod 31) */
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void PQCLEAN_MQDSS64_CLEAN_vgf31_unique(gf31 *out, const gf31 *in);
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/* Given a vector of 16-bit integers (i.e. in [0, 65535], this reduces the
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elements to the range [0, 30] by mapping 31 to 0 (i.e reduction mod 31) */
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void PQCLEAN_MQDSS64_CLEAN_vgf31_shorten_unique(gf31 *out, const gf31 *in);
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/* Given a seed, samples len gf31 elements (in the range [0, 30]), and places
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them in a vector of 16-bit elements */
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void PQCLEAN_MQDSS64_CLEAN_gf31_nrand(gf31 *out, int len, const unsigned char *seed, size_t seedlen);
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/* Given a seed, samples len gf31 elements, transposed into unsigned range,
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i.e. in the range [-15, 15], and places them in an array of 8-bit integers.
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This is used for the expansion of F, which wants packed elements. */
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void PQCLEAN_MQDSS64_CLEAN_gf31_nrand_schar(signed char *out, int len, const unsigned char *seed, size_t seedlen);
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/* Unpacks an array of packed GF31 elements to one element per gf31.
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Assumes that there is sufficient empty space available at the end of the
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array to unpack. Can perform in-place. */
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void PQCLEAN_MQDSS64_CLEAN_gf31_nunpack(gf31 *out, const unsigned char *in, unsigned int n);
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/* Packs an array of GF31 elements from gf31's to concatenated 5-bit values.
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Assumes that there is sufficient space available to unpack.
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Can perform in-place. */
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void PQCLEAN_MQDSS64_CLEAN_gf31_npack(unsigned char *out, const gf31 *in, unsigned int n);
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#endif
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