/*
 * Test driver for generating and verifying keys.
 * Currently only supports generating and verifying ECC keys.
 */
/*  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 */

#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif

#if defined(MBEDTLS_PSA_CRYPTO_DRIVERS) && defined(PSA_CRYPTO_DRIVER_TEST)
#include "psa/crypto.h"
#include "psa_crypto_core.h"
#include "psa_crypto_ecp.h"
#include "psa_crypto_rsa.h"
#include "mbedtls/ecp.h"
#include "mbedtls/error.h"

#include "test/drivers/key_management.h"
#include "test/drivers/test_driver.h"

#include "test/random.h"

#if defined(MBEDTLS_TEST_LIBTESTDRIVER1)
#include "libtestdriver1/library/psa_crypto_ecp.h"
#include "libtestdriver1/library/psa_crypto_rsa.h"
#endif

#include <string.h>

mbedtls_test_driver_key_management_hooks_t
    mbedtls_test_driver_key_management_hooks = MBEDTLS_TEST_DRIVER_KEY_MANAGEMENT_INIT;

const uint8_t mbedtls_test_driver_aes_key[16] =
{ 0x36, 0x77, 0x39, 0x7A, 0x24, 0x43, 0x26, 0x46,
  0x29, 0x4A, 0x40, 0x4E, 0x63, 0x52, 0x66, 0x55 };
const uint8_t mbedtls_test_driver_ecdsa_key[32] =
{ 0xdc, 0x7d, 0x9d, 0x26, 0xd6, 0x7a, 0x4f, 0x63,
  0x2c, 0x34, 0xc2, 0xdc, 0x0b, 0x69, 0x86, 0x18,
  0x38, 0x82, 0xc2, 0x06, 0xdf, 0x04, 0xcd, 0xb7,
  0xd6, 0x9a, 0xab, 0xe2, 0x8b, 0xe4, 0xf8, 0x1a };
const uint8_t mbedtls_test_driver_ecdsa_pubkey[65] =
{ 0x04,
  0x85, 0xf6, 0x4d, 0x89, 0xf0, 0x0b, 0xe6, 0x6c,
  0x88, 0xdd, 0x93, 0x7e, 0xfd, 0x6d, 0x7c, 0x44,
  0x56, 0x48, 0xdc, 0xb7, 0x01, 0x15, 0x0b, 0x8a,
  0x95, 0x09, 0x29, 0x58, 0x50, 0xf4, 0x1c, 0x19,
  0x31, 0xe5, 0x71, 0xfb, 0x8f, 0x8c, 0x78, 0x31,
  0x7a, 0x20, 0xb3, 0x80, 0xe8, 0x66, 0x58, 0x4b,
  0xbc, 0x25, 0x16, 0xc3, 0xd2, 0x70, 0x2d, 0x79,
  0x2f, 0x13, 0x1a, 0x92, 0x20, 0x95, 0xfd, 0x6c };

psa_status_t mbedtls_test_transparent_init(void)
{
    psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;

#if defined(MBEDTLS_TEST_LIBTESTDRIVER1)
    status = libtestdriver1_psa_crypto_init();
    if (status != PSA_SUCCESS) {
        return status;
    }
#endif

    (void) status;
    return PSA_SUCCESS;
}

void mbedtls_test_transparent_free(void)
{
#if defined(MBEDTLS_TEST_LIBTESTDRIVER1)
    libtestdriver1_mbedtls_psa_crypto_free();
#endif

    return;
}

psa_status_t mbedtls_test_opaque_init(void)
{
    return PSA_SUCCESS;
}

void mbedtls_test_opaque_free(void)
{
    return;
}

psa_status_t mbedtls_test_transparent_generate_key(
    const psa_key_attributes_t *attributes,
    uint8_t *key, size_t key_size, size_t *key_length)
{
    ++mbedtls_test_driver_key_management_hooks.hits;
    ++mbedtls_test_driver_key_management_hooks.hits_generate_key;

    if (mbedtls_test_driver_key_management_hooks.forced_status != PSA_SUCCESS) {
        return mbedtls_test_driver_key_management_hooks.forced_status;
    }

    if (mbedtls_test_driver_key_management_hooks.forced_output != NULL) {
        if (mbedtls_test_driver_key_management_hooks.forced_output_length >
            key_size) {
            return PSA_ERROR_BUFFER_TOO_SMALL;
        }
        memcpy(key, mbedtls_test_driver_key_management_hooks.forced_output,
               mbedtls_test_driver_key_management_hooks.forced_output_length);
        *key_length = mbedtls_test_driver_key_management_hooks.forced_output_length;
        return PSA_SUCCESS;
    }

    if (PSA_KEY_TYPE_IS_ECC(psa_get_key_type(attributes))
        && PSA_KEY_TYPE_IS_KEY_PAIR(psa_get_key_type(attributes))) {
#if defined(MBEDTLS_TEST_LIBTESTDRIVER1) && \
        defined(LIBTESTDRIVER1_MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR)
        return libtestdriver1_mbedtls_psa_ecp_generate_key(
            (const libtestdriver1_psa_key_attributes_t *) attributes,
            key, key_size, key_length);
#elif defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR)
        return mbedtls_psa_ecp_generate_key(
            attributes, key, key_size, key_length);
#endif
    } else if (psa_get_key_type(attributes) == PSA_KEY_TYPE_RSA_KEY_PAIR) {
#if defined(MBEDTLS_TEST_LIBTESTDRIVER1) && \
        defined(LIBTESTDRIVER1_MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR)
        return libtestdriver1_mbedtls_psa_rsa_generate_key(
            (const libtestdriver1_psa_key_attributes_t *) attributes,
            key, key_size, key_length);
#elif defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR)
        return mbedtls_psa_rsa_generate_key(
            attributes, key, key_size, key_length);
#endif
    }

    (void) attributes;
    return PSA_ERROR_NOT_SUPPORTED;
}

psa_status_t mbedtls_test_opaque_generate_key(
    const psa_key_attributes_t *attributes,
    uint8_t *key, size_t key_size, size_t *key_length)
{
    (void) attributes;
    (void) key;
    (void) key_size;
    (void) key_length;
    return PSA_ERROR_NOT_SUPPORTED;
}

psa_status_t mbedtls_test_transparent_import_key(
    const psa_key_attributes_t *attributes,
    const uint8_t *data,
    size_t data_length,
    uint8_t *key_buffer,
    size_t key_buffer_size,
    size_t *key_buffer_length,
    size_t *bits)
{
    psa_key_type_t type = psa_get_key_type(attributes);

    ++mbedtls_test_driver_key_management_hooks.hits;
    mbedtls_test_driver_key_management_hooks.location = PSA_KEY_LOCATION_LOCAL_STORAGE;

    if (mbedtls_test_driver_key_management_hooks.forced_status != PSA_SUCCESS) {
        return mbedtls_test_driver_key_management_hooks.forced_status;
    }

    if (PSA_KEY_TYPE_IS_ECC(type)) {
#if defined(MBEDTLS_TEST_LIBTESTDRIVER1) && \
        (defined(LIBTESTDRIVER1_MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) || \
        defined(LIBTESTDRIVER1_MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY))
        return libtestdriver1_mbedtls_psa_ecp_import_key(
            (const libtestdriver1_psa_key_attributes_t *) attributes,
            data, data_length,
            key_buffer, key_buffer_size,
            key_buffer_length, bits);
#elif defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) || \
        defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY)
        return mbedtls_psa_ecp_import_key(
            attributes,
            data, data_length,
            key_buffer, key_buffer_size,
            key_buffer_length, bits);
#endif
    } else if (PSA_KEY_TYPE_IS_RSA(type)) {
#if defined(MBEDTLS_TEST_LIBTESTDRIVER1) && \
        (defined(LIBTESTDRIVER1_MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) || \
        defined(LIBTESTDRIVER1_MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY))
        return libtestdriver1_mbedtls_psa_rsa_import_key(
            (const libtestdriver1_psa_key_attributes_t *) attributes,
            data, data_length,
            key_buffer, key_buffer_size,
            key_buffer_length, bits);
#elif defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) || \
        defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY)
        return mbedtls_psa_rsa_import_key(
            attributes,
            data, data_length,
            key_buffer, key_buffer_size,
            key_buffer_length, bits);
#endif
    }

    (void) data;
    (void) data_length;
    (void) key_buffer;
    (void) key_buffer_size;
    (void) key_buffer_length;
    (void) bits;
    (void) type;

    return PSA_ERROR_NOT_SUPPORTED;
}

psa_status_t mbedtls_test_opaque_export_key(
    const psa_key_attributes_t *attributes,
    const uint8_t *key, size_t key_length,
    uint8_t *data, size_t data_size, size_t *data_length)
{
    /* Assume this is a builtin key based on the key material length. */
    psa_drv_slot_number_t slot_number = *((psa_drv_slot_number_t *) key);

    if (key_length != sizeof(psa_drv_slot_number_t)) {
        /* Test driver does not support generic opaque key handling yet. */
        return PSA_ERROR_NOT_SUPPORTED;
    }

    switch (slot_number) {
        case PSA_CRYPTO_TEST_DRIVER_BUILTIN_ECDSA_KEY_SLOT:
            /* This is the ECDSA slot. Verify the key's attributes before
             * returning the private key. */
            if (psa_get_key_type(attributes) !=
                PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_SECP_R1)) {
                return PSA_ERROR_CORRUPTION_DETECTED;
            }
            if (psa_get_key_bits(attributes) != 256) {
                return PSA_ERROR_CORRUPTION_DETECTED;
            }
            if (psa_get_key_algorithm(attributes) !=
                PSA_ALG_ECDSA(PSA_ALG_ANY_HASH)) {
                return PSA_ERROR_CORRUPTION_DETECTED;
            }
            if ((psa_get_key_usage_flags(attributes) &
                 PSA_KEY_USAGE_EXPORT) == 0) {
                return PSA_ERROR_CORRUPTION_DETECTED;
            }

            if (data_size < sizeof(mbedtls_test_driver_ecdsa_key)) {
                return PSA_ERROR_BUFFER_TOO_SMALL;
            }

            memcpy(data, mbedtls_test_driver_ecdsa_key,
                   sizeof(mbedtls_test_driver_ecdsa_key));
            *data_length = sizeof(mbedtls_test_driver_ecdsa_key);
            return PSA_SUCCESS;

        case PSA_CRYPTO_TEST_DRIVER_BUILTIN_AES_KEY_SLOT:
            /* This is the AES slot. Verify the key's attributes before
             * returning the key. */
            if (psa_get_key_type(attributes) != PSA_KEY_TYPE_AES) {
                return PSA_ERROR_CORRUPTION_DETECTED;
            }
            if (psa_get_key_bits(attributes) != 128) {
                return PSA_ERROR_CORRUPTION_DETECTED;
            }
            if (psa_get_key_algorithm(attributes) != PSA_ALG_CTR) {
                return PSA_ERROR_CORRUPTION_DETECTED;
            }
            if ((psa_get_key_usage_flags(attributes) &
                 PSA_KEY_USAGE_EXPORT) == 0) {
                return PSA_ERROR_CORRUPTION_DETECTED;
            }

            if (data_size < sizeof(mbedtls_test_driver_aes_key)) {
                return PSA_ERROR_BUFFER_TOO_SMALL;
            }

            memcpy(data, mbedtls_test_driver_aes_key,
                   sizeof(mbedtls_test_driver_aes_key));
            *data_length = sizeof(mbedtls_test_driver_aes_key);
            return PSA_SUCCESS;

        default:
            return PSA_ERROR_DOES_NOT_EXIST;
    }
}

psa_status_t mbedtls_test_transparent_export_public_key(
    const psa_key_attributes_t *attributes,
    const uint8_t *key_buffer, size_t key_buffer_size,
    uint8_t *data, size_t data_size, size_t *data_length)
{
    ++mbedtls_test_driver_key_management_hooks.hits;
    ++mbedtls_test_driver_key_management_hooks.hits_export_public_key;

    if (mbedtls_test_driver_key_management_hooks.forced_status != PSA_SUCCESS) {
        return mbedtls_test_driver_key_management_hooks.forced_status;
    }

    if (mbedtls_test_driver_key_management_hooks.forced_output != NULL) {
        if (mbedtls_test_driver_key_management_hooks.forced_output_length >
            data_size) {
            return PSA_ERROR_BUFFER_TOO_SMALL;
        }
        memcpy(data, mbedtls_test_driver_key_management_hooks.forced_output,
               mbedtls_test_driver_key_management_hooks.forced_output_length);
        *data_length = mbedtls_test_driver_key_management_hooks.forced_output_length;
        return PSA_SUCCESS;
    }

    psa_key_type_t key_type = psa_get_key_type(attributes);

    if (PSA_KEY_TYPE_IS_ECC(key_type)) {
#if defined(MBEDTLS_TEST_LIBTESTDRIVER1) && \
        (defined(LIBTESTDRIVER1_MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) || \
        defined(LIBTESTDRIVER1_MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY))
        return libtestdriver1_mbedtls_psa_ecp_export_public_key(
            (const libtestdriver1_psa_key_attributes_t *) attributes,
            key_buffer, key_buffer_size,
            data, data_size, data_length);
#elif defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) || \
        defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY)
        return mbedtls_psa_ecp_export_public_key(
            attributes,
            key_buffer, key_buffer_size,
            data, data_size, data_length);
#endif
    } else if (PSA_KEY_TYPE_IS_RSA(key_type)) {
#if defined(MBEDTLS_TEST_LIBTESTDRIVER1) && \
        (defined(LIBTESTDRIVER1_MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) || \
        defined(LIBTESTDRIVER1_MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY))
        return libtestdriver1_mbedtls_psa_rsa_export_public_key(
            (const libtestdriver1_psa_key_attributes_t *) attributes,
            key_buffer, key_buffer_size,
            data, data_size, data_length);
#elif defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) || \
        defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY)
        return mbedtls_psa_rsa_export_public_key(
            attributes,
            key_buffer, key_buffer_size,
            data, data_size, data_length);
#endif
    }

    (void) key_buffer;
    (void) key_buffer_size;
    (void) key_type;

    return PSA_ERROR_NOT_SUPPORTED;
}

psa_status_t mbedtls_test_opaque_export_public_key(
    const psa_key_attributes_t *attributes,
    const uint8_t *key, size_t key_length,
    uint8_t *data, size_t data_size, size_t *data_length)
{
    if (key_length != sizeof(psa_drv_slot_number_t)) {
        /* Test driver does not support generic opaque key handling yet. */
        return PSA_ERROR_NOT_SUPPORTED;
    }

    /* Assume this is a builtin key based on the key material length. */
    psa_drv_slot_number_t slot_number = *((psa_drv_slot_number_t *) key);
    switch (slot_number) {
        case PSA_CRYPTO_TEST_DRIVER_BUILTIN_ECDSA_KEY_SLOT:
            /* This is the ECDSA slot. Verify the key's attributes before
             * returning the public key. */
            if (psa_get_key_type(attributes) !=
                PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_SECP_R1)) {
                return PSA_ERROR_CORRUPTION_DETECTED;
            }
            if (psa_get_key_bits(attributes) != 256) {
                return PSA_ERROR_CORRUPTION_DETECTED;
            }
            if (psa_get_key_algorithm(attributes) !=
                PSA_ALG_ECDSA(PSA_ALG_ANY_HASH)) {
                return PSA_ERROR_CORRUPTION_DETECTED;
            }

            if (data_size < sizeof(mbedtls_test_driver_ecdsa_pubkey)) {
                return PSA_ERROR_BUFFER_TOO_SMALL;
            }

            memcpy(data, mbedtls_test_driver_ecdsa_pubkey,
                   sizeof(mbedtls_test_driver_ecdsa_pubkey));
            *data_length = sizeof(mbedtls_test_driver_ecdsa_pubkey);
            return PSA_SUCCESS;

        default:
            return PSA_ERROR_DOES_NOT_EXIST;
    }
}

/* The opaque test driver exposes two built-in keys when builtin key support is
 * compiled in.
 * The key in slot #PSA_CRYPTO_TEST_DRIVER_BUILTIN_AES_KEY_SLOT is an AES-128
 * key which allows CTR mode.
 * The key in slot #PSA_CRYPTO_TEST_DRIVER_BUILTIN_ECDSA_KEY_SLOT is a secp256r1
 * private key which allows ECDSA sign & verify.
 * The key buffer format for these is the raw format of psa_drv_slot_number_t
 * (i.e. for an actual driver this would mean 'builtin_key_size' =
 * sizeof(psa_drv_slot_number_t)).
 */
psa_status_t mbedtls_test_opaque_get_builtin_key(
    psa_drv_slot_number_t slot_number,
    psa_key_attributes_t *attributes,
    uint8_t *key_buffer, size_t key_buffer_size, size_t *key_buffer_length)
{
    switch (slot_number) {
        case PSA_CRYPTO_TEST_DRIVER_BUILTIN_AES_KEY_SLOT:
            psa_set_key_type(attributes, PSA_KEY_TYPE_AES);
            psa_set_key_bits(attributes, 128);
            psa_set_key_usage_flags(
                attributes,
                PSA_KEY_USAGE_ENCRYPT |
                PSA_KEY_USAGE_DECRYPT |
                PSA_KEY_USAGE_EXPORT);
            psa_set_key_algorithm(attributes, PSA_ALG_CTR);

            if (key_buffer_size < sizeof(psa_drv_slot_number_t)) {
                return PSA_ERROR_BUFFER_TOO_SMALL;
            }

            *((psa_drv_slot_number_t *) key_buffer) =
                PSA_CRYPTO_TEST_DRIVER_BUILTIN_AES_KEY_SLOT;
            *key_buffer_length = sizeof(psa_drv_slot_number_t);
            return PSA_SUCCESS;
        case PSA_CRYPTO_TEST_DRIVER_BUILTIN_ECDSA_KEY_SLOT:
            psa_set_key_type(
                attributes,
                PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_SECP_R1));
            psa_set_key_bits(attributes, 256);
            psa_set_key_usage_flags(
                attributes,
                PSA_KEY_USAGE_SIGN_HASH |
                PSA_KEY_USAGE_VERIFY_HASH |
                PSA_KEY_USAGE_EXPORT);
            psa_set_key_algorithm(
                attributes, PSA_ALG_ECDSA(PSA_ALG_ANY_HASH));

            if (key_buffer_size < sizeof(psa_drv_slot_number_t)) {
                return PSA_ERROR_BUFFER_TOO_SMALL;
            }

            *((psa_drv_slot_number_t *) key_buffer) =
                PSA_CRYPTO_TEST_DRIVER_BUILTIN_ECDSA_KEY_SLOT;
            *key_buffer_length = sizeof(psa_drv_slot_number_t);
            return PSA_SUCCESS;
        default:
            return PSA_ERROR_DOES_NOT_EXIST;
    }
}

#endif /* MBEDTLS_PSA_CRYPTO_DRIVERS && PSA_CRYPTO_DRIVER_TEST */
