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/*
* PSA ECP layer on top of Mbed TLS crypto
*/
/*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef PSA_CRYPTO_ECP_H
#define PSA_CRYPTO_ECP_H
#include <psa/crypto.h>
#include <mbedtls/ecp.h>
/** Load the contents of a key buffer into an internal ECP representation
*
* \param[in] type The type of key contained in \p data.
* \param[in] curve_bits The nominal bit-size of the curve.
* It must be consistent with the representation
* passed in \p data.
* This can be 0, in which case the bit-size
* is inferred from \p data_length (which is possible
* for all key types and representation formats
* formats that are currently supported or will
* be in the foreseeable future).
* \param[in] data The buffer from which to load the representation.
* \param[in] data_length The size in bytes of \p data.
* \param[out] p_ecp Returns a pointer to an ECP context on success.
* The caller is responsible for freeing both the
* contents of the context and the context itself
* when done.
*/
psa_status_t mbedtls_psa_ecp_load_representation( psa_key_type_t type,
size_t curve_bits,
const uint8_t *data,
size_t data_length,
mbedtls_ecp_keypair **p_ecp );
/** Import an ECP key in binary format.
*
* \note The signature of this function is that of a PSA driver
* import_key entry point. This function behaves as an import_key
* entry point as defined in the PSA driver interface specification for
* transparent drivers.
*
* \param[in] attributes The attributes for the key to import.
* \param[in] data The buffer containing the key data in import
* format.
* \param[in] data_length Size of the \p data buffer in bytes.
* \param[out] key_buffer The buffer containing the key data in output
* format.
* \param[in] key_buffer_size Size of the \p key_buffer buffer in bytes. This
* size is greater or equal to \p data_length.
* \param[out] key_buffer_length The length of the data written in \p
* key_buffer in bytes.
* \param[out] bits The key size in number of bits.
*
* \retval #PSA_SUCCESS The ECP key was imported successfully.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The key data is not correctly formatted.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_CORRUPTION_DETECTED
*/
psa_status_t mbedtls_psa_ecp_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 );
/** Export an ECP key to export representation
*
* \param[in] type The type of key (public/private) to export
* \param[in] ecp The internal ECP representation from which to export
* \param[out] data The buffer to export to
* \param[in] data_size The length of the buffer to export to
* \param[out] data_length The amount of bytes written to \p data
*/
psa_status_t mbedtls_psa_ecp_export_key( psa_key_type_t type,
mbedtls_ecp_keypair *ecp,
uint8_t *data,
size_t data_size,
size_t *data_length );
/** Export an ECP public key or the public part of an ECP key pair in binary
* format.
*
* \note The signature of this function is that of a PSA driver
* export_public_key entry point. This function behaves as an
* export_public_key entry point as defined in the PSA driver interface
* specification.
*
* \param[in] attributes The attributes for the key to export.
* \param[in] key_buffer Material or context of the key to export.
* \param[in] key_buffer_size Size of the \p key_buffer buffer in bytes.
* \param[out] data Buffer where the key data is to be written.
* \param[in] data_size Size of the \p data buffer in bytes.
* \param[out] data_length On success, the number of bytes written in
* \p data
*
* \retval #PSA_SUCCESS The ECP public key was exported successfully.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
*/
psa_status_t mbedtls_psa_ecp_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 );
/**
* \brief Generate an ECP key.
*
* \note The signature of the function is that of a PSA driver generate_key
* entry point.
*
* \param[in] attributes The attributes for the ECP key to generate.
* \param[out] key_buffer Buffer where the key data is to be written.
* \param[in] key_buffer_size Size of \p key_buffer in bytes.
* \param[out] key_buffer_length On success, the number of bytes written in
* \p key_buffer.
*
* \retval #PSA_SUCCESS
* The key was successfully generated.
* \retval #PSA_ERROR_NOT_SUPPORTED
* Key length or type not supported.
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of \p key_buffer is too small.
*/
psa_status_t mbedtls_psa_ecp_generate_key(
const psa_key_attributes_t *attributes,
uint8_t *key_buffer, size_t key_buffer_size, size_t *key_buffer_length );
/** Sign an already-calculated hash with ECDSA.
*
* \note The signature of this function is that of a PSA driver
* sign_hash entry point. This function behaves as a sign_hash
* entry point as defined in the PSA driver interface specification for
* transparent drivers.
*
* \param[in] attributes The attributes of the ECC key to use for the
* operation.
* \param[in] key_buffer The buffer containing the ECC key context.
* format.
* \param[in] key_buffer_size Size of the \p key_buffer buffer in bytes.
* \param[in] alg Randomized or deterministic ECDSA algorithm.
* \param[in] hash The hash or message to sign.
* \param[in] hash_length Size of the \p hash buffer in bytes.
* \param[out] signature Buffer where the signature is to be written.
* \param[in] signature_size Size of the \p signature buffer in bytes.
* \param[out] signature_length On success, the number of bytes
* that make up the returned signature value.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p signature buffer is too small. You can
* determine a sufficient buffer size by calling
* #PSA_SIGN_OUTPUT_SIZE(\c PSA_KEY_TYPE_ECC_KEY_PAIR, \c key_bits,
* \p alg) where \c key_bits is the bit-size of the ECC key.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
*/
psa_status_t mbedtls_psa_ecdsa_sign_hash(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer, size_t key_buffer_size,
psa_algorithm_t alg, const uint8_t *hash, size_t hash_length,
uint8_t *signature, size_t signature_size, size_t *signature_length );
/**
* \brief Verify an ECDSA hash or short message signature.
*
* \note The signature of this function is that of a PSA driver
* verify_hash entry point. This function behaves as a verify_hash
* entry point as defined in the PSA driver interface specification for
* transparent drivers.
*
* \param[in] attributes The attributes of the ECC key to use for the
* operation.
* \param[in] key_buffer The buffer containing the ECC key context.
* format.
* \param[in] key_buffer_size Size of the \p key_buffer buffer in bytes.
* \param[in] alg Randomized or deterministic ECDSA algorithm.
* \param[in] hash The hash or message whose signature is to be
* verified.
* \param[in] hash_length Size of the \p hash buffer in bytes.
* \param[in] signature Buffer containing the signature to verify.
* \param[in] signature_length Size of the \p signature buffer in bytes.
*
* \retval #PSA_SUCCESS
* The signature is valid.
* \retval #PSA_ERROR_INVALID_SIGNATURE
* The calculation was performed successfully, but the passed
* signature is not a valid signature.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
*/
psa_status_t mbedtls_psa_ecdsa_verify_hash(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer, size_t key_buffer_size,
psa_algorithm_t alg, const uint8_t *hash, size_t hash_length,
const uint8_t *signature, size_t signature_length );
/** Perform a key agreement and return the raw ECDH shared secret.
*
* \note The signature of this function is that of a PSA driver
* key_agreement entry point. This function behaves as a key_agreement
* entry point as defined in the PSA driver interface specification for
* transparent drivers.
*
* \param[in] attributes The attributes of the key to use for the
* operation.
* \param[in] key_buffer The buffer containing the private key
* context.
* \param[in] key_buffer_size Size of the \p key_buffer buffer in
* bytes.
* \param[in] alg A key agreement algorithm that is
* compatible with the type of the key.
* \param[in] peer_key The buffer containing the key context
* of the peer's public key.
* \param[in] peer_key_length Size of the \p peer_key buffer in
* bytes.
* \param[out] shared_secret The buffer to which the shared secret
* is to be written.
* \param[in] shared_secret_size Size of the \p shared_secret buffer in
* bytes.
* \param[out] shared_secret_length On success, the number of bytes that make
* up the returned shared secret.
* \retval #PSA_SUCCESS
* Success. Shared secret successfully calculated.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p alg is not a key agreement algorithm, or
* \p private_key is not compatible with \p alg,
* or \p peer_key is not valid for \p alg or not compatible with
* \p private_key.
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* \p shared_secret_size is too small
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not a supported key agreement algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_CORRUPTION_DETECTED
*/
psa_status_t mbedtls_psa_key_agreement_ecdh(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer, size_t key_buffer_size,
psa_algorithm_t alg, const uint8_t *peer_key, size_t peer_key_length,
uint8_t *shared_secret, size_t shared_secret_size,
size_t *shared_secret_length );
#endif /* PSA_CRYPTO_ECP_H */
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