mirror of https://github.com/bitcoin/bitcoin
86 lines
3.4 KiB
C
86 lines
3.4 KiB
C
#ifndef SECP256K1_INT128_H
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#define SECP256K1_INT128_H
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#include "util.h"
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#if defined(SECP256K1_WIDEMUL_INT128)
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# if defined(SECP256K1_INT128_NATIVE)
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# include "int128_native.h"
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# elif defined(SECP256K1_INT128_STRUCT)
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# include "int128_struct.h"
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# else
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# error "Please select int128 implementation"
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# endif
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/* Construct an unsigned 128-bit value from a high and a low 64-bit value. */
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static SECP256K1_INLINE void secp256k1_u128_load(secp256k1_uint128 *r, uint64_t hi, uint64_t lo);
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/* Multiply two unsigned 64-bit values a and b and write the result to r. */
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static SECP256K1_INLINE void secp256k1_u128_mul(secp256k1_uint128 *r, uint64_t a, uint64_t b);
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/* Multiply two unsigned 64-bit values a and b and add the result to r.
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* The final result is taken modulo 2^128.
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*/
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static SECP256K1_INLINE void secp256k1_u128_accum_mul(secp256k1_uint128 *r, uint64_t a, uint64_t b);
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/* Add an unsigned 64-bit value a to r.
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* The final result is taken modulo 2^128.
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*/
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static SECP256K1_INLINE void secp256k1_u128_accum_u64(secp256k1_uint128 *r, uint64_t a);
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/* Unsigned (logical) right shift.
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* Non-constant time in n.
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*/
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static SECP256K1_INLINE void secp256k1_u128_rshift(secp256k1_uint128 *r, unsigned int n);
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/* Return the low 64-bits of a 128-bit value as an unsigned 64-bit value. */
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static SECP256K1_INLINE uint64_t secp256k1_u128_to_u64(const secp256k1_uint128 *a);
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/* Return the high 64-bits of a 128-bit value as an unsigned 64-bit value. */
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static SECP256K1_INLINE uint64_t secp256k1_u128_hi_u64(const secp256k1_uint128 *a);
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/* Write an unsigned 64-bit value to r. */
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static SECP256K1_INLINE void secp256k1_u128_from_u64(secp256k1_uint128 *r, uint64_t a);
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/* Tests if r is strictly less than to 2^n.
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* n must be strictly less than 128.
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*/
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static SECP256K1_INLINE int secp256k1_u128_check_bits(const secp256k1_uint128 *r, unsigned int n);
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/* Construct an signed 128-bit value from a high and a low 64-bit value. */
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static SECP256K1_INLINE void secp256k1_i128_load(secp256k1_int128 *r, int64_t hi, uint64_t lo);
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/* Multiply two signed 64-bit values a and b and write the result to r. */
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static SECP256K1_INLINE void secp256k1_i128_mul(secp256k1_int128 *r, int64_t a, int64_t b);
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/* Multiply two signed 64-bit values a and b and add the result to r.
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* Overflow or underflow from the addition is undefined behaviour.
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*/
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static SECP256K1_INLINE void secp256k1_i128_accum_mul(secp256k1_int128 *r, int64_t a, int64_t b);
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/* Compute a*d - b*c from signed 64-bit values and write the result to r. */
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static SECP256K1_INLINE void secp256k1_i128_det(secp256k1_int128 *r, int64_t a, int64_t b, int64_t c, int64_t d);
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/* Signed (arithmetic) right shift.
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* Non-constant time in b.
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*/
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static SECP256K1_INLINE void secp256k1_i128_rshift(secp256k1_int128 *r, unsigned int b);
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/* Return the low 64-bits of a 128-bit value interpreted as an signed 64-bit value. */
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static SECP256K1_INLINE int64_t secp256k1_i128_to_i64(const secp256k1_int128 *a);
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/* Write a signed 64-bit value to r. */
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static SECP256K1_INLINE void secp256k1_i128_from_i64(secp256k1_int128 *r, int64_t a);
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/* Compare two 128-bit values for equality. */
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static SECP256K1_INLINE int secp256k1_i128_eq_var(const secp256k1_int128 *a, const secp256k1_int128 *b);
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/* Tests if r is equal to 2^n.
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* n must be strictly less than 127.
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*/
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static SECP256K1_INLINE int secp256k1_i128_check_pow2(const secp256k1_int128 *r, unsigned int n);
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#endif
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#endif
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