1 files changed, 149 insertions, 0 deletions
diff --git a/programs/pkey/rsa_encrypt.c b/programs/pkey/rsa_encrypt.c
new file mode 100644
index 00000000000..6538f8a999e
--- /dev/null
+++ b/programs/pkey/rsa_encrypt.c
@@ -0,0 +1,149 @@
+/*
+ *  RSA simple data encryption 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_RSA_C) && \
+    defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_FS_IO) && \
+    defined(MBEDTLS_CTR_DRBG_C)
+#include "mbedtls/rsa.h"
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+
+#include <string.h>
+#endif
+
+#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) ||  \
+    !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_FS_IO) || \
+    !defined(MBEDTLS_CTR_DRBG_C)
+int main(void)
+{
+    mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_RSA_C and/or "
+                   "MBEDTLS_ENTROPY_C and/or MBEDTLS_FS_IO and/or "
+                   "MBEDTLS_CTR_DRBG_C not defined.\n");
+    mbedtls_exit(0);
+}
+#else
+
+
+int main(int argc, char *argv[])
+{
+    FILE *f;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    size_t i;
+    mbedtls_rsa_context rsa;
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    unsigned char input[1024];
+    unsigned char buf[512];
+    const char *pers = "rsa_encrypt";
+    mbedtls_mpi N, E;
+
+    if (argc != 2) {
+        mbedtls_printf("usage: rsa_encrypt <string of max 100 characters>\n");
+
+#if defined(_WIN32)
+        mbedtls_printf("\n");
+#endif
+
+        mbedtls_exit(exit_code);
+    }
+
+    mbedtls_printf("\n  . Seeding the random number generator...");
+    fflush(stdout);
+
+    mbedtls_mpi_init(&N); mbedtls_mpi_init(&E);
+    mbedtls_rsa_init(&rsa);
+    mbedtls_ctr_drbg_init(&ctr_drbg);
+    mbedtls_entropy_init(&entropy);
+
+    ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func,
+                                &entropy, (const unsigned char *) pers,
+                                strlen(pers));
+    if (ret != 0) {
+        mbedtls_printf(" failed\n  ! mbedtls_ctr_drbg_seed returned %d\n",
+                       ret);
+        goto exit;
+    }
+
+    mbedtls_printf("\n  . Reading public key from rsa_pub.txt");
+    fflush(stdout);
+
+    if ((f = fopen("rsa_pub.txt", "rb")) == NULL) {
+        mbedtls_printf(" failed\n  ! Could not open rsa_pub.txt\n" \
+                       "  ! Please run rsa_genkey first\n\n");
+        goto exit;
+    }
+
+    if ((ret = mbedtls_mpi_read_file(&N, 16, f)) != 0 ||
+        (ret = mbedtls_mpi_read_file(&E, 16, f)) != 0) {
+        mbedtls_printf(" failed\n  ! mbedtls_mpi_read_file returned %d\n\n",
+                       ret);
+        fclose(f);
+        goto exit;
+    }
+    fclose(f);
+
+    if ((ret = mbedtls_rsa_import(&rsa, &N, NULL, NULL, NULL, &E)) != 0) {
+        mbedtls_printf(" failed\n  ! mbedtls_rsa_import returned %d\n\n",
+                       ret);
+        goto exit;
+    }
+
+    if (strlen(argv[1]) > 100) {
+        mbedtls_printf(" Input data larger than 100 characters.\n\n");
+        goto exit;
+    }
+
+    memcpy(input, argv[1], strlen(argv[1]));
+
+    /*
+     * Calculate the RSA encryption of the hash.
+     */
+    mbedtls_printf("\n  . Generating the RSA encrypted value");
+    fflush(stdout);
+
+    ret = mbedtls_rsa_pkcs1_encrypt(&rsa, mbedtls_ctr_drbg_random,
+                                    &ctr_drbg, strlen(argv[1]), input, buf);
+    if (ret != 0) {
+        mbedtls_printf(" failed\n  ! mbedtls_rsa_pkcs1_encrypt returned %d\n\n",
+                       ret);
+        goto exit;
+    }
+
+    /*
+     * Write the signature into result-enc.txt
+     */
+    if ((f = fopen("result-enc.txt", "wb+")) == NULL) {
+        mbedtls_printf(" failed\n  ! Could not create %s\n\n", "result-enc.txt");
+        goto exit;
+    }
+
+    for (i = 0; i < mbedtls_rsa_get_len(&rsa); i++) {
+        mbedtls_fprintf(f, "%02X%s", buf[i],
+                        (i + 1) % 16 == 0 ? "\r\n" : " ");
+    }
+
+    fclose(f);
+
+    mbedtls_printf("\n  . Done (created \"%s\")\n\n", "result-enc.txt");
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+    mbedtls_mpi_free(&N); mbedtls_mpi_free(&E);
+    mbedtls_ctr_drbg_free(&ctr_drbg);
+    mbedtls_entropy_free(&entropy);
+    mbedtls_rsa_free(&rsa);
+
+    mbedtls_exit(exit_code);
+}
+#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_ENTROPY_C &&
+          MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */