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