libsodium/test/default/scalarmult.c

#define TEST_NAME "scalarmult"
#include "cmptest.h"

const unsigned char alicesk[crypto_scalarmult_BYTES]
    = { 0x77, 0x07, 0x6d, 0x0a, 0x73, 0x18, 0xa5, 0x7d, 0x3c, 0x16, 0xc1,
        0x72, 0x51, 0xb2, 0x66, 0x45, 0xdf, 0x4c, 0x2f, 0x87, 0xeb, 0xc0,
        0x99, 0x2a, 0xb1, 0x77, 0xfb, 0xa5, 0x1d, 0xb9, 0x2c, 0x2a };

const unsigned char bobsk[crypto_scalarmult_BYTES]
    = { 0x5d, 0xab, 0x08, 0x7e, 0x62, 0x4a, 0x8a, 0x4b, 0x79, 0xe1, 0x7f,
        0x8b, 0x83, 0x80, 0x0e, 0xe6, 0x6f, 0x3b, 0xb1, 0x29, 0x26, 0x18,
        0xb6, 0xfd, 0x1c, 0x2f, 0x8b, 0x27, 0xff, 0x88, 0xe0, 0xeb };

char hex[crypto_scalarmult_BYTES * 2 + 1];

int main(void)
{
    unsigned char *alicepk = sodium_malloc(crypto_scalarmult_BYTES);
    unsigned char *bobpk = sodium_malloc(crypto_scalarmult_BYTES);
    unsigned char *k = sodium_malloc(crypto_scalarmult_BYTES);

    assert(alicepk != NULL && bobpk != NULL && k != NULL);

    crypto_scalarmult_base(alicepk, alicesk);
    sodium_bin2hex(hex, sizeof hex, alicepk, crypto_scalarmult_BYTES);
    printf("%s\n", hex);

    crypto_scalarmult_base(bobpk, bobsk);
    sodium_bin2hex(hex, sizeof hex, bobpk, crypto_scalarmult_BYTES);
    printf("%s\n", hex);

    crypto_scalarmult(k, alicesk, bobpk);
    sodium_bin2hex(hex, sizeof hex, k, crypto_scalarmult_BYTES);
    printf("%s\n", hex);

    crypto_scalarmult(k, bobsk, alicepk);
    sodium_bin2hex(hex, sizeof hex, k, crypto_scalarmult_BYTES);
    printf("%s\n", hex);

    sodium_free(k);
    sodium_free(bobpk);
    sodium_free(alicepk);

    assert(crypto_scalarmult_bytes() > 0U);
    assert(crypto_scalarmult_scalarbytes() > 0U);
    assert(strcmp(crypto_scalarmult_primitive(), "curve25519") == 0);
    assert(crypto_scalarmult_bytes() == crypto_scalarmult_curve25519_bytes());
    assert(crypto_scalarmult_scalarbytes()
           == crypto_scalarmult_curve25519_scalarbytes());
    assert(crypto_scalarmult_bytes() == crypto_scalarmult_scalarbytes());

    return 0;
}