22 lines
356 B
C
22 lines
356 B
C
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#ifndef REDUCE_H
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#define REDUCE_H
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#include <stdint.h>
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#define MONT 4193792U // 2^32 % Q
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#define QINV 4236238847U // -q^(-1) mod 2^32
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/* a <= Q*2^32 => r < 2*Q */
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uint32_t montgomery_reduce(uint64_t a);
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/* r < 2*Q */
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uint32_t reduce32(uint32_t a);
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/* a < 2*Q => r < Q */
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uint32_t csubq(uint32_t a);
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/* r < Q */
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uint32_t freeze(uint32_t a);
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#endif
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