mpt_scalar.c

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#include "secp256k1_mpt.h"
#include <string.h>
#include <openssl/crypto.h>
 
/* 1. Backend Configuration Definitions */
#ifndef USE_SCALAR_8X32
#define USE_SCALAR_8X32
#endif
#ifndef USE_FIELD_10X26
#define USE_FIELD_10X26
#endif
 
/* 2. Include low-level utilities first.
      On ARM64/Apple Silicon, the scalar math depends on 128-bit
      integer helpers defined in these headers. */
#include "util.h"
#include "int128.h"
#include "int128_impl.h"
 
/* 3. Include the actual scalar implementations */
#include "scalar.h"
#include "scalar_impl.h"
 
/* --- Implementation --- */
 
void secp256k1_mpt_scalar_add(unsigned char *res, const unsigned char *a, const unsigned char *b) {
    secp256k1_scalar s_res, s_a, s_b;
    secp256k1_scalar_set_b32(&s_a, a, NULL);
    secp256k1_scalar_set_b32(&s_b, b, NULL);
    secp256k1_scalar_add(&s_res, &s_a, &s_b);
    secp256k1_scalar_get_b32(res, &s_res);
 
    /* SECURE CLEANUP */
    OPENSSL_cleanse(&s_a, sizeof(s_a));
    OPENSSL_cleanse(&s_b, sizeof(s_b));
    OPENSSL_cleanse(&s_res, sizeof(s_res));
}
 
void secp256k1_mpt_scalar_mul(unsigned char *res, const unsigned char *a, const unsigned char *b) {
    secp256k1_scalar s_res, s_a, s_b;
    secp256k1_scalar_set_b32(&s_a, a, NULL);
    secp256k1_scalar_set_b32(&s_b, b, NULL);
    secp256k1_scalar_mul(&s_res, &s_a, &s_b);
    secp256k1_scalar_get_b32(res, &s_res);
 
    /* SECURE CLEANUP */
    OPENSSL_cleanse(&s_a, sizeof(s_a));
    OPENSSL_cleanse(&s_b, sizeof(s_b));
    OPENSSL_cleanse(&s_res, sizeof(s_res));
}
 
void secp256k1_mpt_scalar_inverse(unsigned char *res, const unsigned char *in) {
    secp256k1_scalar s;
    secp256k1_scalar_set_b32(&s, in, NULL);
    secp256k1_scalar_inverse(&s, &s);
    secp256k1_scalar_get_b32(res, &s);
 
    /* SECURE CLEANUP */
    OPENSSL_cleanse(&s, sizeof(s));
}
 
void secp256k1_mpt_scalar_negate(unsigned char *res, const unsigned char *in) {
    secp256k1_scalar s;
    secp256k1_scalar_set_b32(&s, in, NULL);
    secp256k1_scalar_negate(&s, &s);
    secp256k1_scalar_get_b32(res, &s);
 
    /* SECURE CLEANUP */
    OPENSSL_cleanse(&s, sizeof(s));
}
 
void secp256k1_mpt_scalar_reduce32(unsigned char out32[32], const unsigned char in32[32]) {
    secp256k1_scalar s;
    secp256k1_scalar_set_b32(&s, in32, NULL);
    secp256k1_scalar_get_b32(out32, &s);
 
    /* SECURE CLEANUP */
    OPENSSL_cleanse(&s, sizeof(s));
}