/* BEGIN_HEADER */
#include "mbedtls/lms.h"

/* END_HEADER */

/* BEGIN_DEPENDENCIES
 * depends_on:MBEDTLS_LMS_C
 * END_DEPENDENCIES
 */

/* BEGIN_CASE depends_on:MBEDTLS_LMS_PRIVATE */
void lms_sign_verify_test(data_t *msg, data_t *seed)
{
    mbedtls_lms_public_t pub_ctx;
    mbedtls_lms_private_t priv_ctx;
    unsigned char sig[MBEDTLS_LMS_SIG_LEN(MBEDTLS_LMS_SHA256_M32_H10, MBEDTLS_LMOTS_SHA256_N32_W8)];

    mbedtls_lms_public_init(&pub_ctx);
    mbedtls_lms_private_init(&priv_ctx);

    /* Allocation failure isn't a test failure, since it likely just means
     * there's not enough memory to run the test.
     */
    TEST_EQUAL(mbedtls_lms_generate_private_key(&priv_ctx, MBEDTLS_LMS_SHA256_M32_H10,
                                                MBEDTLS_LMOTS_SHA256_N32_W8,
                                                mbedtls_test_rnd_std_rand, NULL,
                                                seed->x, seed->len), 0);

    TEST_EQUAL(mbedtls_lms_calculate_public_key(&pub_ctx, &priv_ctx), 0);

    TEST_EQUAL(mbedtls_lms_sign(&priv_ctx, mbedtls_test_rnd_std_rand, NULL,
                                msg->x, msg->len, sig, sizeof(sig),
                                NULL), 0);

    TEST_EQUAL(mbedtls_lms_verify(&pub_ctx, msg->x, msg->len, sig,
                                  sizeof(sig)), 0);

exit:
    mbedtls_lms_public_free(&pub_ctx);
    mbedtls_lms_private_free(&priv_ctx);
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_LMS_PRIVATE */
void lms_sign_verify_null_msg_test(data_t *seed)
{
    mbedtls_lms_public_t pub_ctx;
    mbedtls_lms_private_t priv_ctx;
    unsigned char sig[MBEDTLS_LMS_SIG_LEN(MBEDTLS_LMS_SHA256_M32_H10, MBEDTLS_LMOTS_SHA256_N32_W8)];

    mbedtls_lms_public_init(&pub_ctx);
    mbedtls_lms_private_init(&priv_ctx);

    /* Allocation failure isn't a test failure, since it likely just means
     * there's not enough memory to run the test.
     */
    TEST_EQUAL(mbedtls_lms_generate_private_key(&priv_ctx, MBEDTLS_LMS_SHA256_M32_H10,
                                                MBEDTLS_LMOTS_SHA256_N32_W8,
                                                mbedtls_test_rnd_std_rand, NULL,
                                                seed->x, seed->len), 0);

    TEST_EQUAL(mbedtls_lms_calculate_public_key(&pub_ctx, &priv_ctx), 0);

    TEST_EQUAL(mbedtls_lms_sign(&priv_ctx, mbedtls_test_rnd_std_rand, NULL,
                                NULL, 0, sig, sizeof(sig),
                                NULL), 0);

    TEST_EQUAL(mbedtls_lms_verify(&pub_ctx, NULL, 0, sig,
                                  sizeof(sig)), 0);

exit:
    mbedtls_lms_public_free(&pub_ctx);
    mbedtls_lms_private_free(&priv_ctx);
}
/* END_CASE */

/* BEGIN_CASE */
void lms_verify_test(data_t *msg, data_t *sig, data_t *pub_key,
                     int expected_rc)
{
    mbedtls_lms_public_t ctx;
    unsigned int size;
    unsigned char *tmp_sig = NULL;

    mbedtls_lms_public_init(&ctx);

    TEST_EQUAL(mbedtls_lms_import_public_key(&ctx, pub_key->x, pub_key->len), 0);

    TEST_EQUAL(mbedtls_lms_verify(&ctx, msg->x, msg->len, sig->x, sig->len), expected_rc);

    /* Test negative cases if the input data is valid */
    if (expected_rc == 0) {
        if (msg->len >= 1) {
            /* Altering first message byte must cause verification failure */
            msg->x[0] ^= 1;
            TEST_EQUAL(mbedtls_lms_verify(&ctx, msg->x, msg->len, sig->x, sig->len),
                       MBEDTLS_ERR_LMS_VERIFY_FAILED);
            msg->x[0] ^= 1;

            /* Altering last message byte must cause verification failure */
            msg->x[msg->len - 1] ^= 1;
            TEST_EQUAL(mbedtls_lms_verify(&ctx, msg->x, msg->len, sig->x, sig->len),
                       MBEDTLS_ERR_LMS_VERIFY_FAILED);
            msg->x[msg->len - 1] ^= 1;
        }

        if (sig->len >= 1) {
            /* Altering first signature byte must cause verification failure */
            sig->x[0] ^= 1;
            TEST_EQUAL(mbedtls_lms_verify(&ctx, msg->x, msg->len, sig->x, sig->len),
                       MBEDTLS_ERR_LMS_VERIFY_FAILED);
            sig->x[0] ^= 1;

            /* Altering last signature byte must cause verification failure */
            sig->x[sig->len - 1] ^= 1;
            TEST_EQUAL(mbedtls_lms_verify(&ctx, msg->x, msg->len, sig->x, sig->len),
                       MBEDTLS_ERR_LMS_VERIFY_FAILED);
            sig->x[sig->len - 1] ^= 1;
        }

        /* Signatures of all sizes must not verify, whether shorter or longer */
        for (size = 0; size < sig->len; size++) {
            if (size == sig->len) {
                continue;
            }

            ASSERT_ALLOC(tmp_sig, size);
            if (tmp_sig != NULL) {
                memcpy(tmp_sig, sig->x, MIN(size, sig->len));
            }

            TEST_EQUAL(mbedtls_lms_verify(&ctx, msg->x, msg->len, tmp_sig, size),
                       MBEDTLS_ERR_LMS_VERIFY_FAILED);
            mbedtls_free(tmp_sig);
            tmp_sig = NULL;
        }
    }

exit:
    mbedtls_free(tmp_sig);
    mbedtls_lms_public_free(&ctx);
}
/* END_CASE */

/* BEGIN_CASE */
void lms_import_export_test(data_t *pub_key, int expected_import_rc)
{
    mbedtls_lms_public_t ctx;
    size_t exported_pub_key_buf_size = 0;
    size_t exported_pub_key_size = 0;
    unsigned char *exported_pub_key = NULL;

    mbedtls_lms_public_init(&ctx);
    TEST_EQUAL(mbedtls_lms_import_public_key(&ctx, pub_key->x, pub_key->len),
               expected_import_rc);

    if (expected_import_rc == 0) {
        exported_pub_key_buf_size = MBEDTLS_LMS_PUBLIC_KEY_LEN(MBEDTLS_LMS_SHA256_M32_H10);
        ASSERT_ALLOC(exported_pub_key, exported_pub_key_buf_size);

        TEST_EQUAL(mbedtls_lms_export_public_key(&ctx, exported_pub_key,
                                                 exported_pub_key_buf_size,
                                                 &exported_pub_key_size), 0);

        TEST_EQUAL(exported_pub_key_size,
                   MBEDTLS_LMS_PUBLIC_KEY_LEN(MBEDTLS_LMS_SHA256_M32_H10));
        ASSERT_COMPARE(pub_key->x, pub_key->len,
                       exported_pub_key, exported_pub_key_size);
        mbedtls_free(exported_pub_key);
        exported_pub_key = NULL;

        /* Export into too-small buffer should fail */
        exported_pub_key_buf_size = MBEDTLS_LMS_PUBLIC_KEY_LEN(MBEDTLS_LMS_SHA256_M32_H10) - 1;
        ASSERT_ALLOC(exported_pub_key, exported_pub_key_buf_size);
        TEST_EQUAL(mbedtls_lms_export_public_key(&ctx, exported_pub_key,
                                                 exported_pub_key_buf_size, NULL),
                   MBEDTLS_ERR_LMS_BUFFER_TOO_SMALL);
        mbedtls_free(exported_pub_key);
        exported_pub_key = NULL;

        /* Export into too-large buffer should succeed */
        exported_pub_key_buf_size = MBEDTLS_LMS_PUBLIC_KEY_LEN(MBEDTLS_LMS_SHA256_M32_H10) + 1;
        ASSERT_ALLOC(exported_pub_key, exported_pub_key_buf_size);
        TEST_EQUAL(mbedtls_lms_export_public_key(&ctx, exported_pub_key,
                                                 exported_pub_key_buf_size,
                                                 &exported_pub_key_size),
                   0);
        ASSERT_COMPARE(pub_key->x, pub_key->len,
                       exported_pub_key, exported_pub_key_size);
        mbedtls_free(exported_pub_key);
        exported_pub_key = NULL;
    }

exit:
    mbedtls_free(exported_pub_key);
    mbedtls_lms_public_free(&ctx);
}
/* END_CASE */