tests/suites/test_suite_rsa.function

/* BEGIN_HEADER */
#include "mbedtls/rsa.h"
#include "rsa_alt_helpers.h"

#include "mbedtls/legacy_or_psa.h"
/* END_HEADER */

/* BEGIN_DEPENDENCIES
 * depends_on:MBEDTLS_RSA_C:MBEDTLS_BIGNUM_C:MBEDTLS_GENPRIME
 * END_DEPENDENCIES
 */

/* BEGIN_CASE */
void rsa_invalid_param()
{
    mbedtls_rsa_context ctx;
    const int invalid_padding = 42;
    const int invalid_hash_id = 0xff;
    unsigned char buf[] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05 };
    size_t buf_len = sizeof(buf);

    mbedtls_rsa_init(&ctx);

    TEST_EQUAL(mbedtls_rsa_get_padding_mode(&ctx), MBEDTLS_RSA_PKCS_V15);
    TEST_EQUAL(mbedtls_rsa_get_md_alg(&ctx), MBEDTLS_MD_NONE);

    TEST_EQUAL(mbedtls_rsa_set_padding(&ctx,
                                       invalid_padding,
                                       MBEDTLS_MD_NONE),
               MBEDTLS_ERR_RSA_INVALID_PADDING);

    TEST_EQUAL(mbedtls_rsa_set_padding(&ctx,
                                       MBEDTLS_RSA_PKCS_V21,
                                       invalid_hash_id),
               MBEDTLS_ERR_RSA_INVALID_PADDING);

    TEST_EQUAL(mbedtls_rsa_pkcs1_sign(&ctx, NULL,
                                      NULL, MBEDTLS_MD_NONE,
                                      buf_len,
                                      NULL, buf),
               MBEDTLS_ERR_RSA_BAD_INPUT_DATA);

    TEST_EQUAL(mbedtls_rsa_pkcs1_sign(&ctx, NULL,
                                      NULL, MBEDTLS_MD_SHA256,
                                      0,
                                      NULL, buf),
               MBEDTLS_ERR_RSA_BAD_INPUT_DATA);

    TEST_EQUAL(mbedtls_rsa_pkcs1_verify(&ctx, MBEDTLS_MD_NONE,
                                        buf_len,
                                        NULL, buf),
               MBEDTLS_ERR_RSA_BAD_INPUT_DATA);

    TEST_EQUAL(mbedtls_rsa_pkcs1_verify(&ctx, MBEDTLS_MD_SHA256,
                                        0,
                                        NULL, buf),
               MBEDTLS_ERR_RSA_BAD_INPUT_DATA);

#if !defined(MBEDTLS_PKCS1_V15)
    TEST_EQUAL(mbedtls_rsa_set_padding(&ctx,
                                       MBEDTLS_RSA_PKCS_V15,
                                       MBEDTLS_MD_NONE),
               MBEDTLS_ERR_RSA_INVALID_PADDING);
#endif

#if defined(MBEDTLS_PKCS1_V15)
    TEST_EQUAL(mbedtls_rsa_rsassa_pkcs1_v15_sign(&ctx, NULL,
                                                 NULL, MBEDTLS_MD_NONE,
                                                 buf_len,
                                                 NULL, buf),
               MBEDTLS_ERR_RSA_BAD_INPUT_DATA);

    TEST_EQUAL(mbedtls_rsa_rsassa_pkcs1_v15_sign(&ctx, NULL,
                                                 NULL, MBEDTLS_MD_SHA256,
                                                 0,
                                                 NULL, buf),
               MBEDTLS_ERR_RSA_BAD_INPUT_DATA);

    TEST_EQUAL(mbedtls_rsa_rsassa_pkcs1_v15_verify(&ctx, MBEDTLS_MD_NONE,
                                                   buf_len,
                                                   NULL, buf),
               MBEDTLS_ERR_RSA_BAD_INPUT_DATA);

    TEST_EQUAL(mbedtls_rsa_rsassa_pkcs1_v15_verify(&ctx, MBEDTLS_MD_SHA256,
                                                   0,
                                                   NULL, buf),
               MBEDTLS_ERR_RSA_BAD_INPUT_DATA);


#endif

#if !defined(MBEDTLS_PKCS1_V21)
    TEST_EQUAL(mbedtls_rsa_set_padding(&ctx,
                                       MBEDTLS_RSA_PKCS_V21,
                                       MBEDTLS_MD_NONE),
               MBEDTLS_ERR_RSA_INVALID_PADDING);
#endif

#if defined(MBEDTLS_PKCS1_V21)
    TEST_EQUAL(mbedtls_rsa_rsassa_pss_sign_ext(&ctx, NULL, NULL,
                                               MBEDTLS_MD_NONE, buf_len,
                                               NULL, buf_len,
                                               buf),
               MBEDTLS_ERR_RSA_BAD_INPUT_DATA);

    TEST_EQUAL(mbedtls_rsa_rsassa_pss_sign_ext(&ctx, NULL, NULL,
                                               MBEDTLS_MD_SHA256, 0,
                                               NULL, buf_len,
                                               buf),
               MBEDTLS_ERR_RSA_BAD_INPUT_DATA);

    TEST_EQUAL(mbedtls_rsa_rsassa_pss_verify_ext(&ctx, MBEDTLS_MD_NONE,
                                                 buf_len, NULL,
                                                 MBEDTLS_MD_NONE,
                                                 buf_len, buf),
               MBEDTLS_ERR_RSA_BAD_INPUT_DATA);

    TEST_EQUAL(mbedtls_rsa_rsassa_pss_verify_ext(&ctx, MBEDTLS_MD_SHA256,
                                                 0, NULL,
                                                 MBEDTLS_MD_NONE,
                                                 buf_len, buf),
               MBEDTLS_ERR_RSA_BAD_INPUT_DATA);

    TEST_EQUAL(mbedtls_rsa_rsassa_pss_verify(&ctx, MBEDTLS_MD_NONE,
                                             buf_len,
                                             NULL, buf),
               MBEDTLS_ERR_RSA_BAD_INPUT_DATA);

    TEST_EQUAL(mbedtls_rsa_rsassa_pss_verify(&ctx, MBEDTLS_MD_SHA256,
                                             0,
                                             NULL, buf),
               MBEDTLS_ERR_RSA_BAD_INPUT_DATA);
#endif

exit:
    mbedtls_rsa_free(&ctx);
}
/* END_CASE */

/* BEGIN_CASE */
void rsa_init_free(int reinit)
{
    mbedtls_rsa_context ctx;

    /* Double free is not explicitly documented to work, but we rely on it
     * even inside the library so that you can call mbedtls_rsa_free()
     * unconditionally on an error path without checking whether it has
     * already been called in the success path. */

    mbedtls_rsa_init(&ctx);
    mbedtls_rsa_free(&ctx);

    if (reinit) {
        mbedtls_rsa_init(&ctx);
    }
    mbedtls_rsa_free(&ctx);

    /* This test case always succeeds, functionally speaking. A plausible
     * bug might trigger an invalid pointer dereference or a memory leak. */
    goto exit;
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_pkcs1_sign(data_t *message_str, int padding_mode,
                            int digest, int mod, char *input_P,
                            char *input_Q, char *input_N, char *input_E,
                            data_t *result_str, int result)
{
    unsigned char output[256];
    mbedtls_rsa_context ctx;
    mbedtls_mpi N, P, Q, E;
    mbedtls_test_rnd_pseudo_info rnd_info;

    mbedtls_mpi_init(&N); mbedtls_mpi_init(&P);
    mbedtls_mpi_init(&Q); mbedtls_mpi_init(&E);
    mbedtls_rsa_init(&ctx);
    TEST_ASSERT(mbedtls_rsa_set_padding(&ctx, padding_mode,
                                        MBEDTLS_MD_NONE) == 0);

    memset(output, 0x00, sizeof(output));
    memset(&rnd_info, 0, sizeof(mbedtls_test_rnd_pseudo_info));

    TEST_ASSERT(mbedtls_test_read_mpi(&P, input_P) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&Q, input_Q) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&N, input_N) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&E, input_E) == 0);

    TEST_ASSERT(mbedtls_rsa_import(&ctx, &N, &P, &Q, NULL, &E) == 0);
    TEST_ASSERT(mbedtls_rsa_get_len(&ctx) == (size_t) (mod / 8));
    TEST_ASSERT(mbedtls_rsa_complete(&ctx) == 0);
    TEST_ASSERT(mbedtls_rsa_check_privkey(&ctx) == 0);

    TEST_ASSERT(mbedtls_rsa_pkcs1_sign(
                    &ctx, &mbedtls_test_rnd_pseudo_rand, &rnd_info,
                    digest, message_str->len, message_str->x,
                    output) == result);
    if (result == 0) {

        TEST_ASSERT(mbedtls_test_hexcmp(output, result_str->x,
                                        ctx.len, result_str->len) == 0);
    }

exit:
    mbedtls_mpi_free(&N); mbedtls_mpi_free(&P);
    mbedtls_mpi_free(&Q); mbedtls_mpi_free(&E);
    mbedtls_rsa_free(&ctx);
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_pkcs1_verify(data_t *message_str, int padding_mode,
                              int digest, int mod,
                              char *input_N, char *input_E,
                              data_t *result_str, int result)
{
    mbedtls_rsa_context ctx;
    mbedtls_mpi N, E;

    mbedtls_mpi_init(&N); mbedtls_mpi_init(&E);
    mbedtls_rsa_init(&ctx);
    TEST_ASSERT(mbedtls_rsa_set_padding(&ctx, padding_mode,
                                        MBEDTLS_MD_NONE) == 0);

    TEST_ASSERT(mbedtls_test_read_mpi(&N, input_N) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&E, input_E) == 0);
    TEST_ASSERT(mbedtls_rsa_import(&ctx, &N, NULL, NULL, NULL, &E) == 0);
    TEST_ASSERT(mbedtls_rsa_get_len(&ctx) == (size_t) (mod / 8));
    TEST_ASSERT(mbedtls_rsa_check_pubkey(&ctx) == 0);

    TEST_ASSERT(mbedtls_rsa_pkcs1_verify(&ctx, digest, message_str->len, message_str->x,
                                         result_str->x) == result);

exit:
    mbedtls_mpi_free(&N); mbedtls_mpi_free(&E);
    mbedtls_rsa_free(&ctx);
}
/* END_CASE */


/* BEGIN_CASE */
void rsa_pkcs1_sign_raw(data_t *hash_result,
                        int padding_mode, int mod,
                        char *input_P, char *input_Q,
                        char *input_N, char *input_E,
                        data_t *result_str)
{
    unsigned char output[256];
    mbedtls_rsa_context ctx;
    mbedtls_mpi N, P, Q, E;
    mbedtls_test_rnd_pseudo_info rnd_info;

    mbedtls_rsa_init(&ctx);
    mbedtls_mpi_init(&N); mbedtls_mpi_init(&P);
    mbedtls_mpi_init(&Q); mbedtls_mpi_init(&E);

    TEST_ASSERT(mbedtls_rsa_set_padding(&ctx, padding_mode,
                                        MBEDTLS_MD_NONE) == 0);

    memset(output, 0x00, sizeof(output));
    memset(&rnd_info, 0, sizeof(mbedtls_test_rnd_pseudo_info));

    TEST_ASSERT(mbedtls_test_read_mpi(&P, input_P) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&Q, input_Q) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&N, input_N) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&E, input_E) == 0);

    TEST_ASSERT(mbedtls_rsa_import(&ctx, &N, &P, &Q, NULL, &E) == 0);
    TEST_ASSERT(mbedtls_rsa_get_len(&ctx) == (size_t) (mod / 8));
    TEST_ASSERT(mbedtls_rsa_complete(&ctx) == 0);
    TEST_ASSERT(mbedtls_rsa_check_privkey(&ctx) == 0);


    TEST_ASSERT(mbedtls_rsa_pkcs1_sign(&ctx, &mbedtls_test_rnd_pseudo_rand,
                                       &rnd_info, MBEDTLS_MD_NONE,
                                       hash_result->len,
                                       hash_result->x, output) == 0);


    TEST_ASSERT(mbedtls_test_hexcmp(output, result_str->x,
                                    ctx.len, result_str->len) == 0);

exit:
    mbedtls_mpi_free(&N); mbedtls_mpi_free(&P);
    mbedtls_mpi_free(&Q); mbedtls_mpi_free(&E);

    mbedtls_rsa_free(&ctx);
}
/* END_CASE */

/* BEGIN_CASE */
void rsa_pkcs1_verify_raw(data_t *hash_result,
                          int padding_mode, int mod,
                          char *input_N, char *input_E,
                          data_t *result_str, int correct)
{
    unsigned char output[256];
    mbedtls_rsa_context ctx;

    mbedtls_mpi N, E;
    mbedtls_mpi_init(&N); mbedtls_mpi_init(&E);

    mbedtls_rsa_init(&ctx);
    TEST_ASSERT(mbedtls_rsa_set_padding(&ctx, padding_mode,
                                        MBEDTLS_MD_NONE) == 0);
    memset(output, 0x00, sizeof(output));

    TEST_ASSERT(mbedtls_test_read_mpi(&N, input_N) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&E, input_E) == 0);

    TEST_ASSERT(mbedtls_rsa_import(&ctx, &N, NULL, NULL, NULL, &E) == 0);
    TEST_ASSERT(mbedtls_rsa_get_len(&ctx) == (size_t) (mod / 8));
    TEST_ASSERT(mbedtls_rsa_check_pubkey(&ctx) == 0);


    TEST_ASSERT(mbedtls_rsa_pkcs1_verify(&ctx, MBEDTLS_MD_NONE, hash_result->len, hash_result->x,
                                         result_str->x) == correct);

exit:
    mbedtls_mpi_free(&N); mbedtls_mpi_free(&E);
    mbedtls_rsa_free(&ctx);
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_pkcs1_encrypt(data_t *message_str, int padding_mode,
                               int mod, char *input_N, char *input_E,
                               data_t *result_str, int result)
{
    unsigned char output[256];
    mbedtls_rsa_context ctx;
    mbedtls_test_rnd_pseudo_info rnd_info;

    mbedtls_mpi N, E;
    mbedtls_mpi_init(&N); mbedtls_mpi_init(&E);

    memset(&rnd_info, 0, sizeof(mbedtls_test_rnd_pseudo_info));

    mbedtls_rsa_init(&ctx);
    TEST_ASSERT(mbedtls_rsa_set_padding(&ctx, padding_mode,
                                        MBEDTLS_MD_NONE) == 0);
    memset(output, 0x00, sizeof(output));

    TEST_ASSERT(mbedtls_test_read_mpi(&N, input_N) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&E, input_E) == 0);

    TEST_ASSERT(mbedtls_rsa_import(&ctx, &N, NULL, NULL, NULL, &E) == 0);
    TEST_ASSERT(mbedtls_rsa_get_len(&ctx) == (size_t) (mod / 8));
    TEST_ASSERT(mbedtls_rsa_check_pubkey(&ctx) == 0);


    TEST_ASSERT(mbedtls_rsa_pkcs1_encrypt(&ctx,
                                          &mbedtls_test_rnd_pseudo_rand,
                                          &rnd_info, message_str->len,
                                          message_str->x,
                                          output) == result);
    if (result == 0) {

        TEST_ASSERT(mbedtls_test_hexcmp(output, result_str->x,
                                        ctx.len, result_str->len) == 0);
    }

exit:
    mbedtls_mpi_free(&N); mbedtls_mpi_free(&E);
    mbedtls_rsa_free(&ctx);
}
/* END_CASE */

/* BEGIN_CASE */
void rsa_pkcs1_encrypt_bad_rng(data_t *message_str, int padding_mode,
                               int mod, char *input_N, char *input_E,
                               data_t *result_str, int result)
{
    unsigned char output[256];
    mbedtls_rsa_context ctx;

    mbedtls_mpi N, E;

    mbedtls_mpi_init(&N); mbedtls_mpi_init(&E);
    mbedtls_rsa_init(&ctx);
    TEST_ASSERT(mbedtls_rsa_set_padding(&ctx, padding_mode,
                                        MBEDTLS_MD_NONE) == 0);
    memset(output, 0x00, sizeof(output));

    TEST_ASSERT(mbedtls_test_read_mpi(&N, input_N) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&E, input_E) == 0);

    TEST_ASSERT(mbedtls_rsa_import(&ctx, &N, NULL, NULL, NULL, &E) == 0);
    TEST_ASSERT(mbedtls_rsa_get_len(&ctx) == (size_t) (mod / 8));
    TEST_ASSERT(mbedtls_rsa_check_pubkey(&ctx) == 0);


    TEST_ASSERT(mbedtls_rsa_pkcs1_encrypt(&ctx, &mbedtls_test_rnd_zero_rand,
                                          NULL, message_str->len,
                                          message_str->x,
                                          output) == result);
    if (result == 0) {

        TEST_ASSERT(mbedtls_test_hexcmp(output, result_str->x,
                                        ctx.len, result_str->len) == 0);
    }

exit:
    mbedtls_mpi_free(&N); mbedtls_mpi_free(&E);
    mbedtls_rsa_free(&ctx);
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_pkcs1_decrypt(data_t *message_str, int padding_mode,
                               int mod, char *input_P,
                               char *input_Q, char *input_N,
                               char *input_E, int max_output,
                               data_t *result_str, int result)
{
    unsigned char output[32];
    mbedtls_rsa_context ctx;
    size_t output_len;
    mbedtls_test_rnd_pseudo_info rnd_info;
    mbedtls_mpi N, P, Q, E;

    mbedtls_mpi_init(&N); mbedtls_mpi_init(&P);
    mbedtls_mpi_init(&Q); mbedtls_mpi_init(&E);

    mbedtls_rsa_init(&ctx);
    TEST_ASSERT(mbedtls_rsa_set_padding(&ctx, padding_mode,
                                        MBEDTLS_MD_NONE) == 0);

    memset(output, 0x00, sizeof(output));
    memset(&rnd_info, 0, sizeof(mbedtls_test_rnd_pseudo_info));


    TEST_ASSERT(mbedtls_test_read_mpi(&P, input_P) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&Q, input_Q) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&N, input_N) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&E, input_E) == 0);

    TEST_ASSERT(mbedtls_rsa_import(&ctx, &N, &P, &Q, NULL, &E) == 0);
    TEST_ASSERT(mbedtls_rsa_get_len(&ctx) == (size_t) (mod / 8));
    TEST_ASSERT(mbedtls_rsa_complete(&ctx) == 0);
    TEST_ASSERT(mbedtls_rsa_check_privkey(&ctx) == 0);

    output_len = 0;

    TEST_ASSERT(mbedtls_rsa_pkcs1_decrypt(&ctx, mbedtls_test_rnd_pseudo_rand,
                                          &rnd_info,
                                          &output_len, message_str->x, output,
                                          max_output) == result);
    if (result == 0) {

        TEST_ASSERT(mbedtls_test_hexcmp(output, result_str->x,
                                        output_len,
                                        result_str->len) == 0);
    }

exit:
    mbedtls_mpi_free(&N); mbedtls_mpi_free(&P);
    mbedtls_mpi_free(&Q); mbedtls_mpi_free(&E);
    mbedtls_rsa_free(&ctx);
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_public(data_t *message_str, int mod,
                        char *input_N, char *input_E,
                        data_t *result_str, int result)
{
    unsigned char output[256];
    mbedtls_rsa_context ctx, ctx2; /* Also test mbedtls_rsa_copy() while at it */

    mbedtls_mpi N, E;

    mbedtls_mpi_init(&N); mbedtls_mpi_init(&E);
    mbedtls_rsa_init(&ctx);
    mbedtls_rsa_init(&ctx2);
    memset(output, 0x00, sizeof(output));

    TEST_ASSERT(mbedtls_test_read_mpi(&N, input_N) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&E, input_E) == 0);

    TEST_ASSERT(mbedtls_rsa_import(&ctx, &N, NULL, NULL, NULL, &E) == 0);

    /* Check test data consistency */
    TEST_ASSERT(message_str->len == (size_t) (mod / 8));
    TEST_ASSERT(mbedtls_rsa_get_len(&ctx) == (size_t) (mod / 8));
    TEST_ASSERT(mbedtls_rsa_check_pubkey(&ctx) == 0);

    TEST_ASSERT(mbedtls_rsa_public(&ctx, message_str->x, output) == result);
    if (result == 0) {

        TEST_ASSERT(mbedtls_test_hexcmp(output, result_str->x,
                                        ctx.len, result_str->len) == 0);
    }

    /* And now with the copy */
    TEST_ASSERT(mbedtls_rsa_copy(&ctx2, &ctx) == 0);
    /* clear the original to be sure */
    mbedtls_rsa_free(&ctx);

    TEST_ASSERT(mbedtls_rsa_check_pubkey(&ctx2) == 0);

    memset(output, 0x00, sizeof(output));
    TEST_ASSERT(mbedtls_rsa_public(&ctx2, message_str->x, output) == result);
    if (result == 0) {

        TEST_ASSERT(mbedtls_test_hexcmp(output, result_str->x,
                                        ctx.len, result_str->len) == 0);
    }

exit:
    mbedtls_mpi_free(&N); mbedtls_mpi_free(&E);
    mbedtls_rsa_free(&ctx);
    mbedtls_rsa_free(&ctx2);
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_private(data_t *message_str, int mod,
                         char *input_P, char *input_Q,
                         char *input_N, char *input_E,
                         data_t *result_str, int result)
{
    unsigned char output[256];
    mbedtls_rsa_context ctx, ctx2; /* Also test mbedtls_rsa_copy() while at it */
    mbedtls_mpi N, P, Q, E;
    mbedtls_test_rnd_pseudo_info rnd_info;
    int i;

    mbedtls_mpi_init(&N); mbedtls_mpi_init(&P);
    mbedtls_mpi_init(&Q); mbedtls_mpi_init(&E);
    mbedtls_rsa_init(&ctx);
    mbedtls_rsa_init(&ctx2);

    memset(&rnd_info, 0, sizeof(mbedtls_test_rnd_pseudo_info));

    TEST_ASSERT(mbedtls_test_read_mpi(&P, input_P) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&Q, input_Q) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&N, input_N) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&E, input_E) == 0);

    TEST_ASSERT(mbedtls_rsa_import(&ctx, &N, &P, &Q, NULL, &E) == 0);

    /* Check test data consistency */
    TEST_ASSERT(message_str->len == (size_t) (mod / 8));
    TEST_ASSERT(mbedtls_rsa_get_len(&ctx) == (size_t) (mod / 8));
    TEST_ASSERT(mbedtls_rsa_complete(&ctx) == 0);
    TEST_ASSERT(mbedtls_rsa_check_privkey(&ctx) == 0);

    /* repeat three times to test updating of blinding values */
    for (i = 0; i < 3; i++) {
        memset(output, 0x00, sizeof(output));
        TEST_ASSERT(mbedtls_rsa_private(&ctx, mbedtls_test_rnd_pseudo_rand,
                                        &rnd_info, message_str->x,
                                        output) == result);
        if (result == 0) {

            TEST_ASSERT(mbedtls_test_hexcmp(output, result_str->x,
                                            ctx.len,
                                            result_str->len) == 0);
        }
    }

    /* And now one more time with the copy */
    TEST_ASSERT(mbedtls_rsa_copy(&ctx2, &ctx) == 0);
    /* clear the original to be sure */
    mbedtls_rsa_free(&ctx);

    TEST_ASSERT(mbedtls_rsa_check_privkey(&ctx2) == 0);

    memset(output, 0x00, sizeof(output));
    TEST_ASSERT(mbedtls_rsa_private(&ctx2, mbedtls_test_rnd_pseudo_rand,
                                    &rnd_info, message_str->x,
                                    output) == result);
    if (result == 0) {

        TEST_ASSERT(mbedtls_test_hexcmp(output, result_str->x,
                                        ctx2.len,
                                        result_str->len) == 0);
    }

exit:
    mbedtls_mpi_free(&N); mbedtls_mpi_free(&P);
    mbedtls_mpi_free(&Q); mbedtls_mpi_free(&E);

    mbedtls_rsa_free(&ctx); mbedtls_rsa_free(&ctx2);
}
/* END_CASE */

/* BEGIN_CASE */
void rsa_check_privkey_null()
{
    mbedtls_rsa_context ctx;
    memset(&ctx, 0x00, sizeof(mbedtls_rsa_context));

    TEST_ASSERT(mbedtls_rsa_check_privkey(&ctx) == MBEDTLS_ERR_RSA_KEY_CHECK_FAILED);
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_check_pubkey(char *input_N, char *input_E, int result)
{
    mbedtls_rsa_context ctx;
    mbedtls_mpi N, E;

    mbedtls_mpi_init(&N); mbedtls_mpi_init(&E);
    mbedtls_rsa_init(&ctx);

    if (strlen(input_N)) {
        TEST_ASSERT(mbedtls_test_read_mpi(&N, input_N) == 0);
    }
    if (strlen(input_E)) {
        TEST_ASSERT(mbedtls_test_read_mpi(&E, input_E) == 0);
    }

    TEST_ASSERT(mbedtls_rsa_import(&ctx, &N, NULL, NULL, NULL, &E) == 0);
    TEST_ASSERT(mbedtls_rsa_check_pubkey(&ctx) == result);

exit:
    mbedtls_mpi_free(&N); mbedtls_mpi_free(&E);
    mbedtls_rsa_free(&ctx);
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_check_privkey(int mod, char *input_P, char *input_Q,
                               char *input_N, char *input_E, char *input_D,
                               char *input_DP, char *input_DQ, char *input_QP,
                               int result)
{
    mbedtls_rsa_context ctx;

    mbedtls_rsa_init(&ctx);

    ctx.len = mod / 8;
    if (strlen(input_P)) {
        TEST_ASSERT(mbedtls_test_read_mpi(&ctx.P, input_P) == 0);
    }
    if (strlen(input_Q)) {
        TEST_ASSERT(mbedtls_test_read_mpi(&ctx.Q, input_Q) == 0);
    }
    if (strlen(input_N)) {
        TEST_ASSERT(mbedtls_test_read_mpi(&ctx.N, input_N) == 0);
    }
    if (strlen(input_E)) {
        TEST_ASSERT(mbedtls_test_read_mpi(&ctx.E, input_E) == 0);
    }
    if (strlen(input_D)) {
        TEST_ASSERT(mbedtls_test_read_mpi(&ctx.D, input_D) == 0);
    }
#if !defined(MBEDTLS_RSA_NO_CRT)
    if (strlen(input_DP)) {
        TEST_ASSERT(mbedtls_test_read_mpi(&ctx.DP, input_DP) == 0);
    }
    if (strlen(input_DQ)) {
        TEST_ASSERT(mbedtls_test_read_mpi(&ctx.DQ, input_DQ) == 0);
    }
    if (strlen(input_QP)) {
        TEST_ASSERT(mbedtls_test_read_mpi(&ctx.QP, input_QP) == 0);
    }
#else
    ((void) input_DP);
    ((void) input_DQ);
    ((void) input_QP);
#endif

    TEST_ASSERT(mbedtls_rsa_check_privkey(&ctx) == result);

exit:
    mbedtls_rsa_free(&ctx);
}
/* END_CASE */

/* BEGIN_CASE */
void rsa_check_pubpriv(int mod, char *input_Npub, char *input_Epub,
                       char *input_P, char *input_Q, char *input_N,
                       char *input_E, char *input_D, char *input_DP,
                       char *input_DQ, char *input_QP, int result)
{
    mbedtls_rsa_context pub, prv;

    mbedtls_rsa_init(&pub);
    mbedtls_rsa_init(&prv);

    pub.len = mod / 8;
    prv.len = mod / 8;

    if (strlen(input_Npub)) {
        TEST_ASSERT(mbedtls_test_read_mpi(&pub.N, input_Npub) == 0);
    }
    if (strlen(input_Epub)) {
        TEST_ASSERT(mbedtls_test_read_mpi(&pub.E, input_Epub) == 0);
    }

    if (strlen(input_P)) {
        TEST_ASSERT(mbedtls_test_read_mpi(&prv.P, input_P) == 0);
    }
    if (strlen(input_Q)) {
        TEST_ASSERT(mbedtls_test_read_mpi(&prv.Q, input_Q) == 0);
    }
    if (strlen(input_N)) {
        TEST_ASSERT(mbedtls_test_read_mpi(&prv.N, input_N) == 0);
    }
    if (strlen(input_E)) {
        TEST_ASSERT(mbedtls_test_read_mpi(&prv.E, input_E) == 0);
    }
    if (strlen(input_D)) {
        TEST_ASSERT(mbedtls_test_read_mpi(&prv.D, input_D) == 0);
    }
#if !defined(MBEDTLS_RSA_NO_CRT)
    if (strlen(input_DP)) {
        TEST_ASSERT(mbedtls_test_read_mpi(&prv.DP, input_DP) == 0);
    }
    if (strlen(input_DQ)) {
        TEST_ASSERT(mbedtls_test_read_mpi(&prv.DQ, input_DQ) == 0);
    }
    if (strlen(input_QP)) {
        TEST_ASSERT(mbedtls_test_read_mpi(&prv.QP, input_QP) == 0);
    }
#else
    ((void) input_DP);
    ((void) input_DQ);
    ((void) input_QP);
#endif

    TEST_ASSERT(mbedtls_rsa_check_pub_priv(&pub, &prv) == result);

exit:
    mbedtls_rsa_free(&pub);
    mbedtls_rsa_free(&prv);
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_gen_key(int nrbits, int exponent, int result)
{
    mbedtls_rsa_context ctx;
    mbedtls_rsa_init(&ctx);

    /* This test uses an insecure RNG, suitable only for testing.
     * In production, always use a cryptographically strong RNG! */
    TEST_ASSERT(mbedtls_rsa_gen_key(&ctx, mbedtls_test_rnd_std_rand, NULL, nrbits,
                                    exponent) == result);
    if (result == 0) {
        TEST_ASSERT(mbedtls_rsa_check_privkey(&ctx) == 0);
        TEST_ASSERT(mbedtls_mpi_cmp_mpi(&ctx.P, &ctx.Q) > 0);
    }

exit:
    mbedtls_rsa_free(&ctx);
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_deduce_primes(char *input_N,
                               char *input_D,
                               char *input_E,
                               char *output_P,
                               char *output_Q,
                               int corrupt, int result)
{
    mbedtls_mpi N, P, Pp, Q, Qp, D, E;

    mbedtls_mpi_init(&N);
    mbedtls_mpi_init(&P);  mbedtls_mpi_init(&Q);
    mbedtls_mpi_init(&Pp); mbedtls_mpi_init(&Qp);
    mbedtls_mpi_init(&D); mbedtls_mpi_init(&E);

    TEST_ASSERT(mbedtls_test_read_mpi(&N, input_N) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&D, input_D) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&E, input_E) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&Qp, output_P) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&Pp, output_Q) == 0);

    if (corrupt) {
        TEST_ASSERT(mbedtls_mpi_add_int(&D, &D, 2) == 0);
    }

    /* Try to deduce P, Q from N, D, E only. */
    TEST_ASSERT(mbedtls_rsa_deduce_primes(&N, &D, &E, &P, &Q) == result);

    if (!corrupt) {
        /* Check if (P,Q) = (Pp, Qp) or (P,Q) = (Qp, Pp) */
        TEST_ASSERT((mbedtls_mpi_cmp_mpi(&P, &Pp) == 0 && mbedtls_mpi_cmp_mpi(&Q, &Qp) == 0) ||
                    (mbedtls_mpi_cmp_mpi(&P, &Qp) == 0 && mbedtls_mpi_cmp_mpi(&Q, &Pp) == 0));
    }

exit:
    mbedtls_mpi_free(&N);
    mbedtls_mpi_free(&P); mbedtls_mpi_free(&Q);
    mbedtls_mpi_free(&Pp); mbedtls_mpi_free(&Qp);
    mbedtls_mpi_free(&D); mbedtls_mpi_free(&E);
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_deduce_private_exponent(char *input_P,
                                         char *input_Q,
                                         char *input_E,
                                         char *output_D,
                                         int corrupt, int result)
{
    mbedtls_mpi P, Q, D, Dp, E, R, Rp;

    mbedtls_mpi_init(&P); mbedtls_mpi_init(&Q);
    mbedtls_mpi_init(&D); mbedtls_mpi_init(&Dp);
    mbedtls_mpi_init(&E);
    mbedtls_mpi_init(&R); mbedtls_mpi_init(&Rp);

    TEST_ASSERT(mbedtls_test_read_mpi(&P, input_P) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&Q, input_Q) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&E, input_E) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&Dp, output_D) == 0);

    if (corrupt) {
        /* Make E even */
        TEST_ASSERT(mbedtls_mpi_set_bit(&E, 0, 0) == 0);
    }

    /* Try to deduce D from N, P, Q, E. */
    TEST_ASSERT(mbedtls_rsa_deduce_private_exponent(&P, &Q,
                                                    &E, &D) == result);

    if (!corrupt) {
        /*
         * Check that D and Dp agree modulo LCM(P-1, Q-1).
         */

        /* Replace P,Q by P-1, Q-1 */
        TEST_ASSERT(mbedtls_mpi_sub_int(&P, &P, 1) == 0);
        TEST_ASSERT(mbedtls_mpi_sub_int(&Q, &Q, 1) == 0);

        /* Check D == Dp modulo P-1 */
        TEST_ASSERT(mbedtls_mpi_mod_mpi(&R,  &D,  &P) == 0);
        TEST_ASSERT(mbedtls_mpi_mod_mpi(&Rp, &Dp, &P) == 0);
        TEST_ASSERT(mbedtls_mpi_cmp_mpi(&R,  &Rp)     == 0);

        /* Check D == Dp modulo Q-1 */
        TEST_ASSERT(mbedtls_mpi_mod_mpi(&R,  &D,  &Q) == 0);
        TEST_ASSERT(mbedtls_mpi_mod_mpi(&Rp, &Dp, &Q) == 0);
        TEST_ASSERT(mbedtls_mpi_cmp_mpi(&R,  &Rp)     == 0);
    }

exit:

    mbedtls_mpi_free(&P); mbedtls_mpi_free(&Q);
    mbedtls_mpi_free(&D); mbedtls_mpi_free(&Dp);
    mbedtls_mpi_free(&E);
    mbedtls_mpi_free(&R); mbedtls_mpi_free(&Rp);
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_import(char *input_N,
                        char *input_P,
                        char *input_Q,
                        char *input_D,
                        char *input_E,
                        int successive,
                        int is_priv,
                        int res_check,
                        int res_complete)
{
    mbedtls_mpi N, P, Q, D, E;
    mbedtls_rsa_context ctx;

    /* Buffers used for encryption-decryption test */
    unsigned char *buf_orig = NULL;
    unsigned char *buf_enc  = NULL;
    unsigned char *buf_dec  = NULL;

    const int have_N = (strlen(input_N) > 0);
    const int have_P = (strlen(input_P) > 0);
    const int have_Q = (strlen(input_Q) > 0);
    const int have_D = (strlen(input_D) > 0);
    const int have_E = (strlen(input_E) > 0);

    mbedtls_rsa_init(&ctx);

    mbedtls_mpi_init(&N);
    mbedtls_mpi_init(&P); mbedtls_mpi_init(&Q);
    mbedtls_mpi_init(&D); mbedtls_mpi_init(&E);

    if (have_N) {
        TEST_ASSERT(mbedtls_test_read_mpi(&N, input_N) == 0);
    }

    if (have_P) {
        TEST_ASSERT(mbedtls_test_read_mpi(&P, input_P) == 0);
    }

    if (have_Q) {
        TEST_ASSERT(mbedtls_test_read_mpi(&Q, input_Q) == 0);
    }

    if (have_D) {
        TEST_ASSERT(mbedtls_test_read_mpi(&D, input_D) == 0);
    }

    if (have_E) {
        TEST_ASSERT(mbedtls_test_read_mpi(&E, input_E) == 0);
    }

    if (!successive) {
        TEST_ASSERT(mbedtls_rsa_import(&ctx,
                                       have_N ? &N : NULL,
                                       have_P ? &P : NULL,
                                       have_Q ? &Q : NULL,
                                       have_D ? &D : NULL,
                                       have_E ? &E : NULL) == 0);
    } else {
        /* Import N, P, Q, D, E separately.
         * This should make no functional difference. */

        TEST_ASSERT(mbedtls_rsa_import(&ctx,
                                       have_N ? &N : NULL,
                                       NULL, NULL, NULL, NULL) == 0);

        TEST_ASSERT(mbedtls_rsa_import(&ctx,
                                       NULL,
                                       have_P ? &P : NULL,
                                       NULL, NULL, NULL) == 0);

        TEST_ASSERT(mbedtls_rsa_import(&ctx,
                                       NULL, NULL,
                                       have_Q ? &Q : NULL,
                                       NULL, NULL) == 0);

        TEST_ASSERT(mbedtls_rsa_import(&ctx,
                                       NULL, NULL, NULL,
                                       have_D ? &D : NULL,
                                       NULL) == 0);

        TEST_ASSERT(mbedtls_rsa_import(&ctx,
                                       NULL, NULL, NULL, NULL,
                                       have_E ? &E : NULL) == 0);
    }

    TEST_ASSERT(mbedtls_rsa_complete(&ctx) == res_complete);

    /* On expected success, perform some public and private
     * key operations to check if the key is working properly. */
    if (res_complete == 0) {
        if (is_priv) {
            TEST_ASSERT(mbedtls_rsa_check_privkey(&ctx) == res_check);
        } else {
            TEST_ASSERT(mbedtls_rsa_check_pubkey(&ctx) == res_check);
        }

        if (res_check != 0) {
            goto exit;
        }

        buf_orig = mbedtls_calloc(1, mbedtls_rsa_get_len(&ctx));
        buf_enc  = mbedtls_calloc(1, mbedtls_rsa_get_len(&ctx));
        buf_dec  = mbedtls_calloc(1, mbedtls_rsa_get_len(&ctx));
        if (buf_orig == NULL || buf_enc == NULL || buf_dec == NULL) {
            goto exit;
        }

        /* This test uses an insecure RNG, suitable only for testing.
         * In production, always use a cryptographically strong RNG! */
        TEST_ASSERT(mbedtls_test_rnd_std_rand(NULL,
                                              buf_orig, mbedtls_rsa_get_len(&ctx)) == 0);

        /* Make sure the number we're generating is smaller than the modulus */
        buf_orig[0] = 0x00;

        TEST_ASSERT(mbedtls_rsa_public(&ctx, buf_orig, buf_enc) == 0);

        if (is_priv) {
            /* This test uses an insecure RNG, suitable only for testing.
             * In production, always use a cryptographically strong RNG! */
            TEST_ASSERT(mbedtls_rsa_private(&ctx, mbedtls_test_rnd_std_rand,
                                            NULL, buf_enc,
                                            buf_dec) == 0);

            TEST_ASSERT(memcmp(buf_orig, buf_dec,
                               mbedtls_rsa_get_len(&ctx)) == 0);
        }
    }

exit:

    mbedtls_free(buf_orig);
    mbedtls_free(buf_enc);
    mbedtls_free(buf_dec);

    mbedtls_rsa_free(&ctx);

    mbedtls_mpi_free(&N);
    mbedtls_mpi_free(&P); mbedtls_mpi_free(&Q);
    mbedtls_mpi_free(&D); mbedtls_mpi_free(&E);
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_export(char *input_N,
                        char *input_P,
                        char *input_Q,
                        char *input_D,
                        char *input_E,
                        int is_priv,
                        int successive)
{
    /* Original MPI's with which we set up the RSA context */
    mbedtls_mpi N, P, Q, D, E;

    /* Exported MPI's */
    mbedtls_mpi Ne, Pe, Qe, De, Ee;

    const int have_N = (strlen(input_N) > 0);
    const int have_P = (strlen(input_P) > 0);
    const int have_Q = (strlen(input_Q) > 0);
    const int have_D = (strlen(input_D) > 0);
    const int have_E = (strlen(input_E) > 0);

    mbedtls_rsa_context ctx;

    mbedtls_rsa_init(&ctx);

    mbedtls_mpi_init(&N);
    mbedtls_mpi_init(&P); mbedtls_mpi_init(&Q);
    mbedtls_mpi_init(&D); mbedtls_mpi_init(&E);

    mbedtls_mpi_init(&Ne);
    mbedtls_mpi_init(&Pe); mbedtls_mpi_init(&Qe);
    mbedtls_mpi_init(&De); mbedtls_mpi_init(&Ee);

    /* Setup RSA context */

    if (have_N) {
        TEST_ASSERT(mbedtls_test_read_mpi(&N, input_N) == 0);
    }

    if (have_P) {
        TEST_ASSERT(mbedtls_test_read_mpi(&P, input_P) == 0);
    }

    if (have_Q) {
        TEST_ASSERT(mbedtls_test_read_mpi(&Q, input_Q) == 0);
    }

    if (have_D) {
        TEST_ASSERT(mbedtls_test_read_mpi(&D, input_D) == 0);
    }

    if (have_E) {
        TEST_ASSERT(mbedtls_test_read_mpi(&E, input_E) == 0);
    }

    TEST_ASSERT(mbedtls_rsa_import(&ctx,
                                   strlen(input_N) ? &N : NULL,
                                   strlen(input_P) ? &P : NULL,
                                   strlen(input_Q) ? &Q : NULL,
                                   strlen(input_D) ? &D : NULL,
                                   strlen(input_E) ? &E : NULL) == 0);

    TEST_ASSERT(mbedtls_rsa_complete(&ctx) == 0);

    /*
     * Export parameters and compare to original ones.
     */

    /* N and E must always be present. */
    if (!successive) {
        TEST_ASSERT(mbedtls_rsa_export(&ctx, &Ne, NULL, NULL, NULL, &Ee) == 0);
    } else {
        TEST_ASSERT(mbedtls_rsa_export(&ctx, &Ne, NULL, NULL, NULL, NULL) == 0);
        TEST_ASSERT(mbedtls_rsa_export(&ctx, NULL, NULL, NULL, NULL, &Ee) == 0);
    }
    TEST_ASSERT(mbedtls_mpi_cmp_mpi(&N, &Ne) == 0);
    TEST_ASSERT(mbedtls_mpi_cmp_mpi(&E, &Ee) == 0);

    /* If we were providing enough information to setup a complete private context,
     * we expect to be able to export all core parameters. */

    if (is_priv) {
        if (!successive) {
            TEST_ASSERT(mbedtls_rsa_export(&ctx, NULL, &Pe, &Qe,
                                           &De, NULL) == 0);
        } else {
            TEST_ASSERT(mbedtls_rsa_export(&ctx, NULL, &Pe, NULL,
                                           NULL, NULL) == 0);
            TEST_ASSERT(mbedtls_rsa_export(&ctx, NULL, NULL, &Qe,
                                           NULL, NULL) == 0);
            TEST_ASSERT(mbedtls_rsa_export(&ctx, NULL, NULL, NULL,
                                           &De, NULL) == 0);
        }

        if (have_P) {
            TEST_ASSERT(mbedtls_mpi_cmp_mpi(&P, &Pe) == 0);
        }

        if (have_Q) {
            TEST_ASSERT(mbedtls_mpi_cmp_mpi(&Q, &Qe) == 0);
        }

        if (have_D) {
            TEST_ASSERT(mbedtls_mpi_cmp_mpi(&D, &De) == 0);
        }

        /* While at it, perform a sanity check */
        TEST_ASSERT(mbedtls_rsa_validate_params(&Ne, &Pe, &Qe, &De, &Ee,
                                                NULL, NULL) == 0);
    }

exit:

    mbedtls_rsa_free(&ctx);

    mbedtls_mpi_free(&N);
    mbedtls_mpi_free(&P); mbedtls_mpi_free(&Q);
    mbedtls_mpi_free(&D); mbedtls_mpi_free(&E);

    mbedtls_mpi_free(&Ne);
    mbedtls_mpi_free(&Pe); mbedtls_mpi_free(&Qe);
    mbedtls_mpi_free(&De); mbedtls_mpi_free(&Ee);
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_validate_params(char *input_N,
                                 char *input_P,
                                 char *input_Q,
                                 char *input_D,
                                 char *input_E,
                                 int prng, int result)
{
    /* Original MPI's with which we set up the RSA context */
    mbedtls_mpi N, P, Q, D, E;

    const int have_N = (strlen(input_N) > 0);
    const int have_P = (strlen(input_P) > 0);
    const int have_Q = (strlen(input_Q) > 0);
    const int have_D = (strlen(input_D) > 0);
    const int have_E = (strlen(input_E) > 0);

    mbedtls_mpi_init(&N);
    mbedtls_mpi_init(&P); mbedtls_mpi_init(&Q);
    mbedtls_mpi_init(&D); mbedtls_mpi_init(&E);

    if (have_N) {
        TEST_ASSERT(mbedtls_test_read_mpi(&N, input_N) == 0);
    }

    if (have_P) {
        TEST_ASSERT(mbedtls_test_read_mpi(&P, input_P) == 0);
    }

    if (have_Q) {
        TEST_ASSERT(mbedtls_test_read_mpi(&Q, input_Q) == 0);
    }

    if (have_D) {
        TEST_ASSERT(mbedtls_test_read_mpi(&D, input_D) == 0);
    }

    if (have_E) {
        TEST_ASSERT(mbedtls_test_read_mpi(&E, input_E) == 0);
    }

    /* This test uses an insecure RNG, suitable only for testing.
     * In production, always use a cryptographically strong RNG! */
    TEST_ASSERT(mbedtls_rsa_validate_params(have_N ? &N : NULL,
                                            have_P ? &P : NULL,
                                            have_Q ? &Q : NULL,
                                            have_D ? &D : NULL,
                                            have_E ? &E : NULL,
                                            prng ? mbedtls_test_rnd_std_rand : NULL,
                                            prng ? NULL : NULL) == result);

exit:
    mbedtls_mpi_free(&N);
    mbedtls_mpi_free(&P); mbedtls_mpi_free(&Q);
    mbedtls_mpi_free(&D); mbedtls_mpi_free(&E);
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_export_raw(data_t *input_N, data_t *input_P,
                            data_t *input_Q, data_t *input_D,
                            data_t *input_E, int is_priv,
                            int successive)
{
    /* Exported buffers */
    unsigned char bufNe[256];
    unsigned char bufPe[128];
    unsigned char bufQe[128];
    unsigned char bufDe[256];
    unsigned char bufEe[1];

    mbedtls_rsa_context ctx;

    mbedtls_rsa_init(&ctx);

    /* Setup RSA context */
    TEST_ASSERT(mbedtls_rsa_import_raw(&ctx,
                                       input_N->len ? input_N->x : NULL, input_N->len,
                                       input_P->len ? input_P->x : NULL, input_P->len,
                                       input_Q->len ? input_Q->x : NULL, input_Q->len,
                                       input_D->len ? input_D->x : NULL, input_D->len,
                                       input_E->len ? input_E->x : NULL, input_E->len) == 0);

    TEST_ASSERT(mbedtls_rsa_complete(&ctx) == 0);

    /*
     * Export parameters and compare to original ones.
     */

    /* N and E must always be present. */
    if (!successive) {
        TEST_ASSERT(mbedtls_rsa_export_raw(&ctx, bufNe, input_N->len,
                                           NULL, 0, NULL, 0, NULL, 0,
                                           bufEe, input_E->len) == 0);
    } else {
        TEST_ASSERT(mbedtls_rsa_export_raw(&ctx, bufNe, input_N->len,
                                           NULL, 0, NULL, 0, NULL, 0,
                                           NULL, 0) == 0);
        TEST_ASSERT(mbedtls_rsa_export_raw(&ctx, NULL, 0,
                                           NULL, 0, NULL, 0, NULL, 0,
                                           bufEe, input_E->len) == 0);
    }
    TEST_ASSERT(memcmp(input_N->x, bufNe, input_N->len) == 0);
    TEST_ASSERT(memcmp(input_E->x, bufEe, input_E->len) == 0);

    /* If we were providing enough information to setup a complete private context,
     * we expect to be able to export all core parameters. */

    if (is_priv) {
        if (!successive) {
            TEST_ASSERT(mbedtls_rsa_export_raw(&ctx, NULL, 0,
                                               bufPe, input_P->len ? input_P->len : sizeof(bufPe),
                                               bufQe, input_Q->len ? input_Q->len : sizeof(bufQe),
                                               bufDe, input_D->len ? input_D->len : sizeof(bufDe),
                                               NULL, 0) == 0);
        } else {
            TEST_ASSERT(mbedtls_rsa_export_raw(&ctx, NULL, 0,
                                               bufPe, input_P->len ? input_P->len : sizeof(bufPe),
                                               NULL, 0, NULL, 0,
                                               NULL, 0) == 0);

            TEST_ASSERT(mbedtls_rsa_export_raw(&ctx, NULL, 0, NULL, 0,
                                               bufQe, input_Q->len ? input_Q->len : sizeof(bufQe),
                                               NULL, 0, NULL, 0) == 0);

            TEST_ASSERT(mbedtls_rsa_export_raw(&ctx, NULL, 0, NULL, 0, NULL, 0,
                                               bufDe, input_D->len ? input_D->len : sizeof(bufDe),
                                               NULL, 0) == 0);
        }

        if (input_P->len) {
            TEST_ASSERT(memcmp(input_P->x, bufPe, input_P->len) == 0);
        }

        if (input_Q->len) {
            TEST_ASSERT(memcmp(input_Q->x, bufQe, input_Q->len) == 0);
        }

        if (input_D->len) {
            TEST_ASSERT(memcmp(input_D->x, bufDe, input_D->len) == 0);
        }

    }

exit:
    mbedtls_rsa_free(&ctx);
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_import_raw(data_t *input_N,
                            data_t *input_P, data_t *input_Q,
                            data_t *input_D, data_t *input_E,
                            int successive,
                            int is_priv,
                            int res_check,
                            int res_complete)
{
    /* Buffers used for encryption-decryption test */
    unsigned char *buf_orig = NULL;
    unsigned char *buf_enc  = NULL;
    unsigned char *buf_dec  = NULL;

    mbedtls_rsa_context ctx;

    mbedtls_rsa_init(&ctx);

    if (!successive) {
        TEST_ASSERT(mbedtls_rsa_import_raw(&ctx,
                                           (input_N->len > 0) ? input_N->x : NULL, input_N->len,
                                           (input_P->len > 0) ? input_P->x : NULL, input_P->len,
                                           (input_Q->len > 0) ? input_Q->x : NULL, input_Q->len,
                                           (input_D->len > 0) ? input_D->x : NULL, input_D->len,
                                           (input_E->len > 0) ? input_E->x : NULL,
                                           input_E->len) == 0);
    } else {
        /* Import N, P, Q, D, E separately.
         * This should make no functional difference. */

        TEST_ASSERT(mbedtls_rsa_import_raw(&ctx,
                                           (input_N->len > 0) ? input_N->x : NULL, input_N->len,
                                           NULL, 0, NULL, 0, NULL, 0, NULL, 0) == 0);

        TEST_ASSERT(mbedtls_rsa_import_raw(&ctx,
                                           NULL, 0,
                                           (input_P->len > 0) ? input_P->x : NULL, input_P->len,
                                           NULL, 0, NULL, 0, NULL, 0) == 0);

        TEST_ASSERT(mbedtls_rsa_import_raw(&ctx,
                                           NULL, 0, NULL, 0,
                                           (input_Q->len > 0) ? input_Q->x : NULL, input_Q->len,
                                           NULL, 0, NULL, 0) == 0);

        TEST_ASSERT(mbedtls_rsa_import_raw(&ctx,
                                           NULL, 0, NULL, 0, NULL, 0,
                                           (input_D->len > 0) ? input_D->x : NULL, input_D->len,
                                           NULL, 0) == 0);

        TEST_ASSERT(mbedtls_rsa_import_raw(&ctx,
                                           NULL, 0, NULL, 0, NULL, 0, NULL, 0,
                                           (input_E->len > 0) ? input_E->x : NULL,
                                           input_E->len) == 0);
    }

    TEST_ASSERT(mbedtls_rsa_complete(&ctx) == res_complete);

    /* On expected success, perform some public and private
     * key operations to check if the key is working properly. */
    if (res_complete == 0) {
        if (is_priv) {
            TEST_ASSERT(mbedtls_rsa_check_privkey(&ctx) == res_check);
        } else {
            TEST_ASSERT(mbedtls_rsa_check_pubkey(&ctx) == res_check);
        }

        if (res_check != 0) {
            goto exit;
        }

        buf_orig = mbedtls_calloc(1, mbedtls_rsa_get_len(&ctx));
        buf_enc  = mbedtls_calloc(1, mbedtls_rsa_get_len(&ctx));
        buf_dec  = mbedtls_calloc(1, mbedtls_rsa_get_len(&ctx));
        if (buf_orig == NULL || buf_enc == NULL || buf_dec == NULL) {
            goto exit;
        }

        /* This test uses an insecure RNG, suitable only for testing.
         * In production, always use a cryptographically strong RNG! */
        TEST_ASSERT(mbedtls_test_rnd_std_rand(NULL,
                                              buf_orig, mbedtls_rsa_get_len(&ctx)) == 0);

        /* Make sure the number we're generating is smaller than the modulus */
        buf_orig[0] = 0x00;

        TEST_ASSERT(mbedtls_rsa_public(&ctx, buf_orig, buf_enc) == 0);

        if (is_priv) {
            /* This test uses an insecure RNG, suitable only for testing.
             * In production, always use a cryptographically strong RNG! */
            TEST_ASSERT(mbedtls_rsa_private(&ctx, mbedtls_test_rnd_std_rand,
                                            NULL, buf_enc,
                                            buf_dec) == 0);

            TEST_ASSERT(memcmp(buf_orig, buf_dec,
                               mbedtls_rsa_get_len(&ctx)) == 0);
        }
    }

exit:

    mbedtls_free(buf_orig);
    mbedtls_free(buf_enc);
    mbedtls_free(buf_dec);

    mbedtls_rsa_free(&ctx);
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */
void rsa_selftest()
{
    TEST_ASSERT(mbedtls_rsa_self_test(1) == 0);
}
/* END_CASE */