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/*
* Simple MPI demonstration program
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
#include "mbedtls/build_info.h"
#include "mbedtls/platform.h"
#if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_FS_IO)
#include "mbedtls/bignum.h"
#include <stdio.h>
#endif
#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_FS_IO)
int main(void)
{
mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_FS_IO not defined.\n");
mbedtls_exit(0);
}
#else
int main(void)
{
int ret = 1;
int exit_code = MBEDTLS_EXIT_FAILURE;
mbedtls_mpi E, P, Q, N, H, D, X, Y, Z;
mbedtls_mpi_init(&E); mbedtls_mpi_init(&P); mbedtls_mpi_init(&Q); mbedtls_mpi_init(&N);
mbedtls_mpi_init(&H); mbedtls_mpi_init(&D); mbedtls_mpi_init(&X); mbedtls_mpi_init(&Y);
mbedtls_mpi_init(&Z);
MBEDTLS_MPI_CHK(mbedtls_mpi_read_string(&P, 10, "2789"));
MBEDTLS_MPI_CHK(mbedtls_mpi_read_string(&Q, 10, "3203"));
MBEDTLS_MPI_CHK(mbedtls_mpi_read_string(&E, 10, "257"));
MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(&N, &P, &Q));
mbedtls_printf("\n Public key:\n\n");
MBEDTLS_MPI_CHK(mbedtls_mpi_write_file(" N = ", &N, 10, NULL));
MBEDTLS_MPI_CHK(mbedtls_mpi_write_file(" E = ", &E, 10, NULL));
mbedtls_printf("\n Private key:\n\n");
MBEDTLS_MPI_CHK(mbedtls_mpi_write_file(" P = ", &P, 10, NULL));
MBEDTLS_MPI_CHK(mbedtls_mpi_write_file(" Q = ", &Q, 10, NULL));
#if defined(MBEDTLS_GENPRIME)
MBEDTLS_MPI_CHK(mbedtls_mpi_sub_int(&P, &P, 1));
MBEDTLS_MPI_CHK(mbedtls_mpi_sub_int(&Q, &Q, 1));
MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(&H, &P, &Q));
MBEDTLS_MPI_CHK(mbedtls_mpi_inv_mod(&D, &E, &H));
mbedtls_mpi_write_file(" D = E^-1 mod (P-1)*(Q-1) = ",
&D, 10, NULL);
#else
mbedtls_printf("\nTest skipped (MBEDTLS_GENPRIME not defined).\n\n");
#endif
MBEDTLS_MPI_CHK(mbedtls_mpi_read_string(&X, 10, "55555"));
MBEDTLS_MPI_CHK(mbedtls_mpi_exp_mod(&Y, &X, &E, &N, NULL));
MBEDTLS_MPI_CHK(mbedtls_mpi_exp_mod(&Z, &Y, &D, &N, NULL));
mbedtls_printf("\n RSA operation:\n\n");
MBEDTLS_MPI_CHK(mbedtls_mpi_write_file(" X (plaintext) = ", &X, 10, NULL));
MBEDTLS_MPI_CHK(mbedtls_mpi_write_file(" Y (ciphertext) = X^E mod N = ", &Y, 10, NULL));
MBEDTLS_MPI_CHK(mbedtls_mpi_write_file(" Z (decrypted) = Y^D mod N = ", &Z, 10, NULL));
mbedtls_printf("\n");
exit_code = MBEDTLS_EXIT_SUCCESS;
cleanup:
mbedtls_mpi_free(&E); mbedtls_mpi_free(&P); mbedtls_mpi_free(&Q); mbedtls_mpi_free(&N);
mbedtls_mpi_free(&H); mbedtls_mpi_free(&D); mbedtls_mpi_free(&X); mbedtls_mpi_free(&Y);
mbedtls_mpi_free(&Z);
if (exit_code != MBEDTLS_EXIT_SUCCESS) {
mbedtls_printf("\nAn error occurred.\n");
}
mbedtls_exit(exit_code);
}
#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_FS_IO */
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