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80 lines
2.6 KiB
C
80 lines
2.6 KiB
C
/*
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Public domain by Andrew M. <liquidsun@gmail.com>
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See: https://github.com/floodyberry/curve25519-donna
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32 bit integer curve25519 implementation
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*/
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typedef uint32_t bignum25519[10];
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/* out = in */
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void curve25519_copy(bignum25519 out, const bignum25519 in);
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/* out = a + b */
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void curve25519_add(bignum25519 out, const bignum25519 a, const bignum25519 b);
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void curve25519_add_after_basic(bignum25519 out, const bignum25519 a, const bignum25519 b);
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void curve25519_add_reduce(bignum25519 out, const bignum25519 a, const bignum25519 b);
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/* out = a - b */
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void curve25519_sub(bignum25519 out, const bignum25519 a, const bignum25519 b);
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/* out = in * scalar */
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void curve25519_scalar_product(bignum25519 out, const bignum25519 in, const uint32_t scalar);
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/* out = a - b, where a is the result of a basic op (add,sub) */
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void curve25519_sub_after_basic(bignum25519 out, const bignum25519 a, const bignum25519 b);
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void curve25519_sub_reduce(bignum25519 out, const bignum25519 a, const bignum25519 b);
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/* out = -a */
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void curve25519_neg(bignum25519 out, const bignum25519 a);
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/* out = a * b */
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#define curve25519_mul_noinline curve25519_mul
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void curve25519_mul(bignum25519 out, const bignum25519 a, const bignum25519 b);
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/* out = in * in */
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void curve25519_square(bignum25519 out, const bignum25519 in);
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/* out = in ^ (2 * count) */
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void curve25519_square_times(bignum25519 out, const bignum25519 in, int count);
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/* Take a little-endian, 32-byte number and expand it into polynomial form */
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void curve25519_expand(bignum25519 out, const unsigned char in[32]);
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/* Take a fully reduced polynomial form number and contract it into a
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* little-endian, 32-byte array
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*/
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void curve25519_contract(unsigned char out[32], const bignum25519 in);
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/* if (iswap) swap(a, b) */
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void curve25519_swap_conditional(bignum25519 a, bignum25519 b, uint32_t iswap);
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/* uint32_t to Zmod(2^255-19) */
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void curve25519_set(bignum25519 r, uint32_t x);
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/* set d */
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void curve25519_set_d(bignum25519 r);
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/* set 2d */
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void curve25519_set_2d(bignum25519 r);
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/* set sqrt(-1) */
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void curve25519_set_sqrtneg1(bignum25519 r);
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/* constant time Zmod(2^255-19) negative test */
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int curve25519_isnegative(const bignum25519 f);
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/* constant time Zmod(2^255-19) non-zero test */
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int curve25519_isnonzero(const bignum25519 f);
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/* reduce Zmod(2^255-19) */
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void curve25519_reduce(bignum25519 r, const bignum25519 in);
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void curve25519_divpowm1(bignum25519 r, const bignum25519 u, const bignum25519 v);
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/* Zmod(2^255-19) from byte array to bignum25519 expansion with modular reduction */
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void curve25519_expand_reduce(bignum25519 out, const unsigned char in[32]);
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