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diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/external/mbedtls/programs/pkey/mpi_demo.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/mbedtls/programs/pkey/mpi_demo.c
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--- /dev/null
+++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/mbedtls/programs/pkey/mpi_demo.c
@@ -0,0 +1,109 @@
+/*
+ * Simple MPI demonstration program
+ *
+ * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * This file is part of mbed TLS (https://tls.mbed.org)
+ */
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdio.h>
+#define mbedtls_printf printf
+#endif
+
+#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");
+ return( 0 );
+}
+#else
+int main( void )
+{
+ int ret;
+ 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" );
+
+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( ret != 0 )
+ {
+ mbedtls_printf( "\nAn error occurred.\n" );
+ ret = 1;
+ }
+
+#if defined(_WIN32)
+ mbedtls_printf( " Press Enter to exit this program.\n" );
+ fflush( stdout ); getchar();
+#endif
+
+ return( ret );
+}
+#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_FS_IO */