tests/suites/test_suite_pkparse.function

/* BEGIN_HEADER */
#include "mbedtls/pk.h"
#include "mbedtls/pem.h"
#include "mbedtls/oid.h"
#include "mbedtls/ecp.h"
#include "mbedtls/psa_util.h"
#include "pk_internal.h"

#if defined(MBEDTLS_PSA_CRYPTO_C)
#include "test/psa_exercise_key.h"
#endif

#if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
#define HAVE_mbedtls_pk_parse_key_pkcs8_encrypted_der
#endif

#if defined(MBEDTLS_PSA_CRYPTO_C) && defined(MBEDTLS_FS_IO)
static int test_psa_bridge(const mbedtls_pk_context *ctx,
                           psa_key_usage_t usage_flag)
{
    switch (usage_flag) {
        case PSA_KEY_USAGE_SIGN_HASH:
            mbedtls_test_set_step(0);
            break;
        case PSA_KEY_USAGE_SIGN_MESSAGE:
            mbedtls_test_set_step(1);
            break;
        case PSA_KEY_USAGE_DECRYPT:
            mbedtls_test_set_step(2);
            break;
        case PSA_KEY_USAGE_DERIVE:
            mbedtls_test_set_step(3);
            break;
        case PSA_KEY_USAGE_VERIFY_HASH:
            mbedtls_test_set_step(4);
            break;
        case PSA_KEY_USAGE_VERIFY_MESSAGE:
            mbedtls_test_set_step(5);
            break;
        case PSA_KEY_USAGE_ENCRYPT:
            mbedtls_test_set_step(6);
            break;
    }

    psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
    mbedtls_svc_key_id_t psa_key = MBEDTLS_SVC_KEY_ID_INIT;
    int ok = 0;

    TEST_EQUAL(mbedtls_pk_get_psa_attributes(ctx, usage_flag, &attributes), 0);
    int ret = mbedtls_pk_import_into_psa(ctx, &attributes, &psa_key);
    if (mbedtls_pk_get_type(ctx) == MBEDTLS_PK_RSA &&
        mbedtls_pk_get_bitlen(ctx) % 8 != 0 &&
        ret == MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE) {
        /* There is a historical limitation with support for RSA keys in PSA:
         * only byte-aligned sizes are supported.
         * https://github.com/Mbed-TLS/mbedtls/issues/9048
         * For now, for such keys, treat not-supported from PSA as a success.
         */
        ok = 1;
        goto exit;
    }
    TEST_EQUAL(ret, 0);
    if (!mbedtls_test_key_consistency_psa_pk(psa_key, ctx)) {
        goto exit;
    }

    psa_algorithm_t exercise_usage = psa_get_key_usage_flags(&attributes);
    psa_algorithm_t exercise_alg = psa_get_key_algorithm(&attributes);
    if (mbedtls_test_can_exercise_psa_algorithm(exercise_alg)) {
        TEST_ASSERT(mbedtls_test_psa_exercise_key(psa_key,
                                                  exercise_usage,
                                                  exercise_alg, 0));
    }

    mbedtls_test_set_step((unsigned long) -1);
    ok = 1;

exit:
    psa_destroy_key(psa_key);
    psa_reset_key_attributes(&attributes);
    return ok;
}

#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
/* Whether a pk key can do ECDSA. Opaque keys are not supported since this
 * test suite does not create opaque keys. */
static int pk_can_ecdsa(const mbedtls_pk_context *ctx)
{
    /* Check whether we have an EC key. Unfortunately this also accepts
     * keys on Montgomery curves, which can only do ECDH, so we'll have
     * to dig further. */
    if (!mbedtls_pk_can_do(ctx, MBEDTLS_PK_ECDSA)) {
        return 0;
    }
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
    return ctx->ec_family != PSA_ECC_FAMILY_MONTGOMERY;
#elif defined(MBEDTLS_ECDSA_C)
    return mbedtls_ecdsa_can_do(mbedtls_pk_ec_ro(*ctx)->grp.id);
#else
    return 0;
#endif
}
#endif /* MBEDTLS_PK_HAVE_ECC_KEYS */
#endif /* MBEDTLS_PSA_CRYPTO_C &&  && MBEDTLS_FS_IO */

/* END_HEADER */

/* BEGIN_DEPENDENCIES
 * depends_on:MBEDTLS_PK_PARSE_C
 * END_DEPENDENCIES
 */

/* BEGIN_CASE depends_on:MBEDTLS_RSA_C:MBEDTLS_FS_IO */
void pk_parse_keyfile_rsa(char *key_file, char *password, int result)
{
    mbedtls_pk_context ctx;
    mbedtls_pk_init(&ctx);
    int res;
    char *pwd = password;

    MD_PSA_INIT();

    if (strcmp(pwd, "NULL") == 0) {
        pwd = NULL;
    }

    res = mbedtls_pk_parse_keyfile(&ctx, key_file, pwd,
                                   mbedtls_test_rnd_std_rand, NULL);

    TEST_EQUAL(res, result);

    if (res == 0) {
        mbedtls_rsa_context *rsa;
        TEST_ASSERT(mbedtls_pk_can_do(&ctx, MBEDTLS_PK_RSA));
        rsa = mbedtls_pk_rsa(ctx);
        TEST_EQUAL(mbedtls_rsa_check_privkey(rsa), 0);

        size_t bitlen = mbedtls_rsa_get_bitlen(rsa);
        TEST_EQUAL(mbedtls_pk_get_bitlen(&ctx), bitlen);
        TEST_EQUAL(mbedtls_pk_get_len(&ctx), (bitlen + 7) / 8);

#if defined(MBEDTLS_PSA_CRYPTO_C)
        PSA_INIT();
        TEST_ASSERT(test_psa_bridge(&ctx, PSA_KEY_USAGE_SIGN_HASH));
        TEST_ASSERT(test_psa_bridge(&ctx, PSA_KEY_USAGE_SIGN_MESSAGE));
        TEST_ASSERT(test_psa_bridge(&ctx, PSA_KEY_USAGE_DECRYPT));
        TEST_ASSERT(test_psa_bridge(&ctx, PSA_KEY_USAGE_VERIFY_HASH));
        TEST_ASSERT(test_psa_bridge(&ctx, PSA_KEY_USAGE_VERIFY_MESSAGE));
        TEST_ASSERT(test_psa_bridge(&ctx, PSA_KEY_USAGE_ENCRYPT));
#endif
    }

exit:
    mbedtls_pk_free(&ctx);
    PSA_DONE();
}

/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_RSA_C:MBEDTLS_FS_IO */
void pk_parse_public_keyfile_rsa(char *key_file, int result)
{
    mbedtls_pk_context ctx;
    mbedtls_pk_init(&ctx);
    int res;

    MD_PSA_INIT();

    res = mbedtls_pk_parse_public_keyfile(&ctx, key_file);

    TEST_EQUAL(res, result);

    if (res == 0) {
        mbedtls_rsa_context *rsa;
        TEST_ASSERT(mbedtls_pk_can_do(&ctx, MBEDTLS_PK_RSA));
        rsa = mbedtls_pk_rsa(ctx);
        TEST_EQUAL(mbedtls_rsa_check_pubkey(rsa), 0);

        size_t bitlen = mbedtls_rsa_get_bitlen(rsa);
        TEST_EQUAL(mbedtls_pk_get_bitlen(&ctx), bitlen);
        TEST_EQUAL(mbedtls_pk_get_len(&ctx), (bitlen + 7) / 8);

#if defined(MBEDTLS_PSA_CRYPTO_C)
        PSA_INIT();
        TEST_ASSERT(test_psa_bridge(&ctx, PSA_KEY_USAGE_VERIFY_HASH));
        TEST_ASSERT(test_psa_bridge(&ctx, PSA_KEY_USAGE_VERIFY_MESSAGE));
        TEST_ASSERT(test_psa_bridge(&ctx, PSA_KEY_USAGE_ENCRYPT));
#endif
    }

exit:
    mbedtls_pk_free(&ctx);
    PSA_DONE();
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_PK_HAVE_ECC_KEYS */
void pk_parse_public_keyfile_ec(char *key_file, int result)
{
    mbedtls_pk_context ctx;
    int res;

    mbedtls_pk_init(&ctx);
    MD_OR_USE_PSA_INIT();

    res = mbedtls_pk_parse_public_keyfile(&ctx, key_file);

    TEST_EQUAL(res, result);

    if (res == 0) {
        TEST_ASSERT(mbedtls_pk_can_do(&ctx, MBEDTLS_PK_ECKEY));
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
        /* No need to check whether the parsed public point is on the curve or
         * not because this is already done by the internal "pk_get_ecpubkey()"
         * function */
#else
        const mbedtls_ecp_keypair *eckey;
        eckey = mbedtls_pk_ec_ro(ctx);
        TEST_EQUAL(mbedtls_ecp_check_pubkey(&eckey->grp, &eckey->Q), 0);
#endif

#if defined(MBEDTLS_PSA_CRYPTO_C)
        PSA_INIT();
        if (pk_can_ecdsa(&ctx)) {
            TEST_ASSERT(test_psa_bridge(&ctx, PSA_KEY_USAGE_VERIFY_HASH));
            TEST_ASSERT(test_psa_bridge(&ctx, PSA_KEY_USAGE_VERIFY_MESSAGE));
        }
#endif
    }

exit:
    mbedtls_pk_free(&ctx);
    PSA_DONE();
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_PK_HAVE_ECC_KEYS */
void pk_parse_keyfile_ec(char *key_file, char *password, int result)
{
    mbedtls_pk_context ctx;
    int res;

    mbedtls_pk_init(&ctx);
    MD_OR_USE_PSA_INIT();

    res = mbedtls_pk_parse_keyfile(&ctx, key_file, password,
                                   mbedtls_test_rnd_std_rand, NULL);

    TEST_EQUAL(res, result);

    if (res == 0) {
        TEST_ASSERT(mbedtls_pk_can_do(&ctx, MBEDTLS_PK_ECKEY));
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
        /* PSA keys are already checked on import so nothing to do here. */
#else
        const mbedtls_ecp_keypair *eckey = mbedtls_pk_ec_ro(ctx);
        TEST_EQUAL(mbedtls_ecp_check_privkey(&eckey->grp, &eckey->d), 0);
#endif

#if defined(MBEDTLS_PSA_CRYPTO_C)
        PSA_INIT();
        TEST_ASSERT(test_psa_bridge(&ctx, PSA_KEY_USAGE_DERIVE));
        if (pk_can_ecdsa(&ctx)) {
            TEST_ASSERT(test_psa_bridge(&ctx, PSA_KEY_USAGE_SIGN_HASH));
            TEST_ASSERT(test_psa_bridge(&ctx, PSA_KEY_USAGE_SIGN_MESSAGE));
            TEST_ASSERT(test_psa_bridge(&ctx, PSA_KEY_USAGE_VERIFY_HASH));
            TEST_ASSERT(test_psa_bridge(&ctx, PSA_KEY_USAGE_VERIFY_MESSAGE));
        }
#endif
    }

exit:
    mbedtls_pk_free(&ctx);
    PSA_DONE();
}
/* END_CASE */

/* BEGIN_CASE */
void pk_parse_key(data_t *buf, int result)
{
    mbedtls_pk_context pk;

    mbedtls_pk_init(&pk);
    USE_PSA_INIT();

    TEST_ASSERT(mbedtls_pk_parse_key(&pk, buf->x, buf->len, NULL, 0,
                                     mbedtls_test_rnd_std_rand, NULL) == result);

exit:
    mbedtls_pk_free(&pk);
    USE_PSA_DONE();
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_TEST_HOOKS:HAVE_mbedtls_pk_parse_key_pkcs8_encrypted_der */
void pk_parse_key_encrypted(data_t *buf, data_t *pass, int result)
{
    mbedtls_pk_context pk;

    mbedtls_pk_init(&pk);
    USE_PSA_INIT();

    TEST_EQUAL(mbedtls_pk_parse_key_pkcs8_encrypted_der(&pk, buf->x, buf->len,
                                                        pass->x, pass->len,
                                                        mbedtls_test_rnd_std_rand,
                                                        NULL), result);
exit:
    mbedtls_pk_free(&pk);
    USE_PSA_DONE();
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_PK_HAVE_ECC_KEYS:MBEDTLS_PK_WRITE_C */
void pk_parse_fix_montgomery(data_t *input_key, data_t *exp_output)
{
    /* Montgomery keys have specific bits set to either 0 or 1 depending on
     * their position. This is enforced during parsing (please see the implementation
     * of mbedtls_ecp_read_key() for more details). The scope of this function
     * is to verify this enforcing by feeding the parse algorithm with a x25519
     * key which does not have those bits set properly. */
    mbedtls_pk_context pk;
    unsigned char *output_key = NULL;
    size_t output_key_len = 0;

    mbedtls_pk_init(&pk);
    USE_PSA_INIT();

    TEST_EQUAL(mbedtls_pk_parse_key(&pk, input_key->x, input_key->len, NULL, 0,
                                    mbedtls_test_rnd_std_rand, NULL), 0);

    output_key_len = input_key->len;
    TEST_CALLOC(output_key, output_key_len);
    /* output_key_len is updated with the real amount of data written to
     * output_key buffer. */
    output_key_len = mbedtls_pk_write_key_der(&pk, output_key, output_key_len);
    TEST_ASSERT(output_key_len > 0);

    TEST_MEMORY_COMPARE(exp_output->x, exp_output->len, output_key, output_key_len);

exit:
    if (output_key != NULL) {
        mbedtls_free(output_key);
    }
    mbedtls_pk_free(&pk);
    USE_PSA_DONE();
}
/* END_CASE */