i2pd/tests/test-x25519.cpp

#include <cassert>
#include <inttypes.h>
#include <string.h>

#include "Ed25519.h"

const uint8_t k[32] =
{
    0xa5, 0x46, 0xe3, 0x6b, 0xf0, 0x52, 0x7c, 0x9d, 0x3b, 0x16, 0x15,
    0x4b, 0x82, 0x46, 0x5e, 0xdd, 0x62, 0x14, 0x4c, 0x0a, 0xc1, 0xfc,
    0x5a, 0x18, 0x50, 0x6a, 0x22, 0x44, 0xba, 0x44, 0x9a, 0xc4
};

const uint8_t u[32] =
{
    0xe6, 0xdb, 0x68, 0x67, 0x58, 0x30, 0x30, 0xdb, 0x35, 0x94, 0xc1,
    0xa4, 0x24, 0xb1, 0x5f, 0x7c, 0x72, 0x66, 0x24, 0xec, 0x26, 0xb3,
    0x35, 0x3b, 0x10, 0xa9, 0x03, 0xa6, 0xd0, 0xab, 0x1c, 0x4c
};

uint8_t p[32] =
{
    0xc3, 0xda, 0x55, 0x37, 0x9d, 0xe9, 0xc6, 0x90, 0x8e, 0x94, 0xea,
    0x4d, 0xf2, 0x8d, 0x08, 0x4f, 0x32, 0xec, 0xcf, 0x03, 0x49, 0x1c,
    0x71, 0xf7, 0x54, 0xb4, 0x07, 0x55, 0x77, 0xa2, 0x85, 0x52
};

int main ()
{
#if !OPENSSL_X25519
// we test it for openssl < 1.1.0
    uint8_t buf[32];
    BN_CTX * ctx = BN_CTX_new ();
    i2p::crypto::GetEd25519 ()->ScalarMul (u, k, buf, ctx);
    BN_CTX_free (ctx);
    assert(memcmp (buf, p, 32) == 0);
#endif
}