secure_fw/services/crypto/crypto_cipher.c

/*
 * Copyright (c) 2018-2019, Arm Limited. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 *
 */

#include <stddef.h>
#include <stdint.h>

/* FixMe: Use PSA_CONNECTION_REFUSED when performing parameter
 *        integrity checks but this will have to be revised
 *        when the full set of error codes mandated by PSA FF
 *        is available.
 */
#include "tfm_mbedcrypto_include.h"

#include "tfm_crypto_api.h"
#include "tfm_crypto_defs.h"

/*!
 * \defgroup public_psa Public functions, PSA
 *
 */

/*!@{*/
psa_status_t tfm_crypto_cipher_set_iv(psa_invec in_vec[],
                                      size_t in_len,
                                      psa_outvec out_vec[],
                                      size_t out_len)
{
    psa_status_t status = PSA_SUCCESS;
    psa_cipher_operation_t *operation = NULL;

    if ((in_len != 2) || (out_len != 1)) {
        return PSA_CONNECTION_REFUSED;
    }

    if ((in_vec[0].len != sizeof(struct tfm_crypto_pack_iovec)) ||
        (out_vec[0].len != sizeof(uint32_t))) {
        return PSA_CONNECTION_REFUSED;
    }
    const struct tfm_crypto_pack_iovec *iov = in_vec[0].base;
    uint32_t handle = iov->op_handle;
    uint32_t *handle_out = out_vec[0].base;
    const unsigned char *iv = in_vec[1].base;
    size_t iv_length = in_vec[1].len;

    /* Init the handle in the operation with the one passed from the iov */
    *handle_out = iov->op_handle;

    /* Look up the corresponding operation context */
    status = tfm_crypto_operation_lookup(TFM_CRYPTO_CIPHER_OPERATION,
                                         handle,
                                         (void **)&operation);
    if (status != PSA_SUCCESS) {
        return status;
    }

    status = psa_cipher_set_iv(operation, iv, iv_length);
    if (status != PSA_SUCCESS) {
        /* Release the operation context, ignore if the operation fails. */
        (void)tfm_crypto_operation_release(handle_out);
        return status;
    }

    return status;
}

/**
 * TODO: psa_cipher_generate_iv(...)
 *
 */

psa_status_t tfm_crypto_cipher_encrypt_setup(psa_invec in_vec[],
                                             size_t in_len,
                                             psa_outvec out_vec[],
                                             size_t out_len)
{
    psa_status_t status = PSA_SUCCESS;
    psa_cipher_operation_t *operation = NULL;

    if ((in_len != 1) || (out_len != 1)) {
        return PSA_CONNECTION_REFUSED;
    }

    if ((out_vec[0].len != sizeof(uint32_t)) ||
        (in_vec[0].len != sizeof(struct tfm_crypto_pack_iovec))) {
        return PSA_CONNECTION_REFUSED;
    }
    const struct tfm_crypto_pack_iovec *iov = in_vec[0].base;
    uint32_t handle = iov->op_handle;
    uint32_t *handle_out = out_vec[0].base;
    psa_key_handle_t key_handle = iov->key_handle;
    psa_algorithm_t alg = iov->alg;

    /* Allocate the operation context in the secure world */
    status = tfm_crypto_operation_alloc(TFM_CRYPTO_CIPHER_OPERATION,
                                        &handle,
                                        (void **)&operation);
    if (status != PSA_SUCCESS) {
        return status;
    }

    *handle_out = handle;

    status = psa_cipher_encrypt_setup(operation, key_handle, alg);
    if (status != PSA_SUCCESS) {
        /* Release the operation context, ignore if the operation fails. */
        (void)tfm_crypto_operation_release(handle_out);
        return status;
    }

    return status;
}

psa_status_t tfm_crypto_cipher_decrypt_setup(psa_invec in_vec[],
                                             size_t in_len,
                                             psa_outvec out_vec[],
                                             size_t out_len)
{
    psa_status_t status = PSA_SUCCESS;
    psa_cipher_operation_t *operation = NULL;

    if ((in_len != 1) || (out_len != 1)) {
        return PSA_CONNECTION_REFUSED;
    }

    if ((out_vec[0].len != sizeof(uint32_t)) ||
        (in_vec[0].len != sizeof(struct tfm_crypto_pack_iovec))) {
        return PSA_CONNECTION_REFUSED;
    }
    const struct tfm_crypto_pack_iovec *iov = in_vec[0].base;
    uint32_t handle = iov->op_handle;
    uint32_t *handle_out = out_vec[0].base;
    psa_key_handle_t key_handle = iov->key_handle;
    psa_algorithm_t alg = iov->alg;

    /* Allocate the operation context in the secure world */
    status = tfm_crypto_operation_alloc(TFM_CRYPTO_CIPHER_OPERATION,
                                        &handle,
                                        (void **)&operation);
    if (status != PSA_SUCCESS) {
        return status;
    }

    *handle_out = handle;

    status = psa_cipher_decrypt_setup(operation, key_handle, alg);
    if (status != PSA_SUCCESS) {
        /* Release the operation context, ignore if the operation fails. */
        (void)tfm_crypto_operation_release(handle_out);
        return status;
    }

    return status;
}

psa_status_t tfm_crypto_cipher_update(psa_invec in_vec[],
                                      size_t in_len,
                                      psa_outvec out_vec[],
                                      size_t out_len)
{
    psa_status_t status = PSA_SUCCESS;
    psa_cipher_operation_t *operation = NULL;

    if ((in_len != 2) || (out_len != 2)) {
        return PSA_CONNECTION_REFUSED;
    }

    if ((in_vec[0].len != sizeof(struct tfm_crypto_pack_iovec)) ||
        (out_vec[0].len != sizeof(uint32_t))) {
        return PSA_CONNECTION_REFUSED;
    }
    const struct tfm_crypto_pack_iovec *iov = in_vec[0].base;
    uint32_t handle = iov->op_handle;
    uint32_t *handle_out = out_vec[0].base;
    const uint8_t *input = in_vec[1].base;
    size_t input_length = in_vec[1].len;
    unsigned char *output = out_vec[1].base;
    size_t output_size = out_vec[1].len;

    /* Init the handle in the operation with the one passed from the iov */
    *handle_out = iov->op_handle;

    /* Initialise the output_length to zero */
    out_vec[1].len = 0;

    /* Look up the corresponding operation context */
    status = tfm_crypto_operation_lookup(TFM_CRYPTO_CIPHER_OPERATION,
                                         handle,
                                         (void **)&operation);
    if (status != PSA_SUCCESS) {
        return status;
    }

    status = psa_cipher_update(operation, input, input_length,
                               output, output_size, &out_vec[1].len);
    if (status != PSA_SUCCESS) {
        /* Release the operation context, ignore if the operation fails. */
        (void)tfm_crypto_operation_release(handle_out);
        return status;
    }

    return status;
}

psa_status_t tfm_crypto_cipher_finish(psa_invec in_vec[],
                                      size_t in_len,
                                      psa_outvec out_vec[],
                                      size_t out_len)
{
    psa_status_t status = PSA_SUCCESS;
    psa_cipher_operation_t *operation = NULL;

    if ((in_len != 1) || (out_len != 2)) {
        return PSA_CONNECTION_REFUSED;
    }

    if ((in_vec[0].len != sizeof(struct tfm_crypto_pack_iovec)) ||
        (out_vec[0].len != sizeof(uint32_t))) {
        return PSA_CONNECTION_REFUSED;
    }
    const struct tfm_crypto_pack_iovec *iov = in_vec[0].base;
    uint32_t handle = iov->op_handle;
    uint32_t *handle_out = out_vec[0].base;
    unsigned char *output = out_vec[1].base;
    size_t output_size = out_vec[1].len;

    /* Init the handle in the operation with the one passed from the iov */
    *handle_out = iov->op_handle;

    /* Initialise the output_length to zero */
    out_vec[1].len = 0;

    /* Look up the corresponding operation context */
    status = tfm_crypto_operation_lookup(TFM_CRYPTO_CIPHER_OPERATION,
                                         handle,
                                         (void **)&operation);
    if (status != PSA_SUCCESS) {
        return status;
    }

    status = psa_cipher_finish(operation, output, output_size, &out_vec[1].len);
    if (status != PSA_SUCCESS) {
        /* Release the operation context, ignore if the operation fails. */
        (void)tfm_crypto_operation_release(handle_out);
        return status;
    }

    status = tfm_crypto_operation_release(handle_out);

    return status;
}

psa_status_t tfm_crypto_cipher_abort(psa_invec in_vec[],
                                     size_t in_len,
                                     psa_outvec out_vec[],
                                     size_t out_len)
{
    psa_status_t status = PSA_SUCCESS;
    psa_cipher_operation_t *operation = NULL;

    if ((in_len != 1) || (out_len != 1)) {
        return PSA_CONNECTION_REFUSED;
    }

    if ((in_vec[0].len != sizeof(struct tfm_crypto_pack_iovec)) ||
        (out_vec[0].len != sizeof(uint32_t))) {
        return PSA_CONNECTION_REFUSED;
    }
    const struct tfm_crypto_pack_iovec *iov = in_vec[0].base;
    uint32_t handle = iov->op_handle;
    uint32_t *handle_out = out_vec[0].base;

    /* Init the handle in the operation with the one passed from the iov */
    *handle_out = iov->op_handle;

    /* Look up the corresponding operation context */
    status = tfm_crypto_operation_lookup(TFM_CRYPTO_CIPHER_OPERATION,
                                         handle,
                                         (void **)&operation);
    if (status != PSA_SUCCESS) {
        return status;
    }

    status = psa_cipher_abort(operation);

    if (status != PSA_SUCCESS) {
        /* Release the operation context, ignore if the operation fails. */
        (void)tfm_crypto_operation_release(handle_out);
        return status;
    }

    status = tfm_crypto_operation_release(handle_out);

    return status;
}
/*!@}*/