475 lines
23 KiB
C
475 lines
23 KiB
C
/*
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* PSA PAKE layer on top of Mbed TLS software 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_PAKE_H
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#define PSA_CRYPTO_PAKE_H
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#include <psa/crypto.h>
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/** Set the session information for a password-authenticated key exchange.
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*
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* The sequence of operations to set up a password-authenticated key exchange
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* is as follows:
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* -# Allocate an operation object which will be passed to all the functions
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* listed here.
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* -# Initialize the operation object with one of the methods described in the
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* documentation for #psa_pake_operation_t, e.g.
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* #PSA_PAKE_OPERATION_INIT.
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* -# Call psa_pake_setup() to specify the cipher suite.
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* -# Call \c psa_pake_set_xxx() functions on the operation to complete the
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* setup. The exact sequence of \c psa_pake_set_xxx() functions that needs
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* to be called depends on the algorithm in use.
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*
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* Refer to the documentation of individual PAKE algorithm types (`PSA_ALG_XXX`
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* values of type ::psa_algorithm_t such that #PSA_ALG_IS_PAKE(\c alg) is true)
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* for more information.
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*
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* A typical sequence of calls to perform a password-authenticated key
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* exchange:
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* -# Call psa_pake_output(operation, #PSA_PAKE_STEP_KEY_SHARE, ...) to get the
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* key share that needs to be sent to the peer.
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* -# Call psa_pake_input(operation, #PSA_PAKE_STEP_KEY_SHARE, ...) to provide
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* the key share that was received from the peer.
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* -# Depending on the algorithm additional calls to psa_pake_output() and
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* psa_pake_input() might be necessary.
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* -# Call psa_pake_get_implicit_key() for accessing the shared secret.
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*
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* Refer to the documentation of individual PAKE algorithm types (`PSA_ALG_XXX`
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* values of type ::psa_algorithm_t such that #PSA_ALG_IS_PAKE(\c alg) is true)
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* for more information.
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*
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* If an error occurs at any step after a call to psa_pake_setup(),
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* the operation will need to be reset by a call to psa_pake_abort(). The
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* application may call psa_pake_abort() at any time after the operation
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* has been initialized.
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*
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* After a successful call to psa_pake_setup(), the application must
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* eventually terminate the operation. The following events terminate an
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* operation:
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* - A call to psa_pake_abort().
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* - A successful call to psa_pake_get_implicit_key().
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*
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* \param[in,out] operation The operation object to set up. It must have
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* been initialized but not set up yet.
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* \param[in] cipher_suite The cipher suite to use. (A cipher suite fully
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* characterizes a PAKE algorithm and determines
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* the algorithm as well.)
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*
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* \retval #PSA_SUCCESS
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* Success.
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* \retval #PSA_ERROR_INVALID_ARGUMENT
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* The algorithm in \p cipher_suite is not a PAKE algorithm, or the
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* PAKE primitive in \p cipher_suite is not compatible with the
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* PAKE algorithm, or the hash algorithm in \p cipher_suite is invalid
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* or not compatible with the PAKE algorithm and primitive.
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* \retval #PSA_ERROR_NOT_SUPPORTED
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* The algorithm in \p cipher_suite is not a supported PAKE algorithm,
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* or the PAKE primitive in \p cipher_suite is not supported or not
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* compatible with the PAKE algorithm, or the hash algorithm in
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* \p cipher_suite is not supported or not compatible with the PAKE
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* algorithm and primitive.
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* \retval #PSA_ERROR_COMMUNICATION_FAILURE
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* \retval #PSA_ERROR_CORRUPTION_DETECTED
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* \retval #PSA_ERROR_BAD_STATE
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* The operation state is not valid, or
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* the library has not been previously initialized by psa_crypto_init().
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* It is implementation-dependent whether a failure to initialize
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* results in this error code.
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*/
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psa_status_t mbedtls_psa_pake_setup(psa_pake_operation_t *operation,
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const psa_pake_cipher_suite_t *cipher_suite);
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/** Set the password for a password-authenticated key exchange from key ID.
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*
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* Call this function when the password, or a value derived from the password,
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* is already present in the key store.
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*
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* \param[in,out] operation The operation object to set the password for. It
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* must have been set up by psa_pake_setup() and
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* not yet in use (neither psa_pake_output() nor
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* psa_pake_input() has been called yet). It must
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* be on operation for which the password hasn't
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* been set yet (psa_pake_set_password_key()
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* hasn't been called yet).
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* \param password Identifier of the key holding the password or a
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* value derived from the password (eg. by a
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* memory-hard function). It must remain valid
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* until the operation terminates. It must be of
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* type #PSA_KEY_TYPE_PASSWORD or
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* #PSA_KEY_TYPE_PASSWORD_HASH. It has to allow
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* the usage #PSA_KEY_USAGE_DERIVE.
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*
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* \retval #PSA_SUCCESS
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* Success.
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* \retval #PSA_ERROR_INVALID_HANDLE
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* \p password is not a valid key identifier.
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* \retval #PSA_ERROR_NOT_PERMITTED
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* The key does not have the #PSA_KEY_USAGE_DERIVE flag, or it does not
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* permit the \p operation's algorithm.
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* \retval #PSA_ERROR_INVALID_ARGUMENT
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* The key type for \p password is not #PSA_KEY_TYPE_PASSWORD or
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* #PSA_KEY_TYPE_PASSWORD_HASH, or \p password is not compatible with
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* the \p operation's cipher suite.
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* \retval #PSA_ERROR_NOT_SUPPORTED
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* The key type or key size of \p password is not supported with the
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* \p operation's cipher suite.
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* \retval #PSA_ERROR_COMMUNICATION_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_DATA_CORRUPT
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* \retval #PSA_ERROR_DATA_INVALID
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* \retval #PSA_ERROR_BAD_STATE
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* The operation state is not valid (it must have been set up.), or
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* the library has not been previously initialized by psa_crypto_init().
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* It is implementation-dependent whether a failure to initialize
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* results in this error code.
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*/
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psa_status_t mbedtls_psa_pake_set_password_key(
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psa_pake_operation_t *operation,
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mbedtls_svc_key_id_t password);
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/** Set the user ID for a password-authenticated key exchange.
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*
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* Call this function to set the user ID. For PAKE algorithms that associate a
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* user identifier with each side of the session you need to call
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* psa_pake_set_peer() as well. For PAKE algorithms that associate a single
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* user identifier with the session, call psa_pake_set_user() only.
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*
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* Refer to the documentation of individual PAKE algorithm types (`PSA_ALG_XXX`
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* values of type ::psa_algorithm_t such that #PSA_ALG_IS_PAKE(\c alg) is true)
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* for more information.
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*
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* \param[in,out] operation The operation object to set the user ID for. It
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* must have been set up by psa_pake_setup() and
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* not yet in use (neither psa_pake_output() nor
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* psa_pake_input() has been called yet). It must
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* be on operation for which the user ID hasn't
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* been set (psa_pake_set_user() hasn't been
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* called yet).
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* \param[in] user_id The user ID to authenticate with.
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* \param user_id_len Size of the \p user_id buffer in bytes.
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*
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* \retval #PSA_SUCCESS
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* Success.
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* \retval #PSA_ERROR_INVALID_ARGUMENT
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* \p user_id is not valid for the \p operation's algorithm and cipher
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* suite.
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* \retval #PSA_ERROR_NOT_SUPPORTED
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* The value of \p user_id is not supported by the implementation.
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* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
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* \retval #PSA_ERROR_COMMUNICATION_FAILURE
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* \retval #PSA_ERROR_CORRUPTION_DETECTED
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* \retval #PSA_ERROR_BAD_STATE
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* The operation state is not valid, or
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* the library has not been previously initialized by psa_crypto_init().
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* It is implementation-dependent whether a failure to initialize
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* results in this error code.
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*/
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psa_status_t mbedtls_psa_pake_set_user(psa_pake_operation_t *operation,
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const uint8_t *user_id,
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size_t user_id_len);
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/** Set the peer ID for a password-authenticated key exchange.
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*
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* Call this function in addition to psa_pake_set_user() for PAKE algorithms
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* that associate a user identifier with each side of the session. For PAKE
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* algorithms that associate a single user identifier with the session, call
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* psa_pake_set_user() only.
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*
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* Refer to the documentation of individual PAKE algorithm types (`PSA_ALG_XXX`
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* values of type ::psa_algorithm_t such that #PSA_ALG_IS_PAKE(\c alg) is true)
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* for more information.
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*
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* \param[in,out] operation The operation object to set the peer ID for. It
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* must have been set up by psa_pake_setup() and
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* not yet in use (neither psa_pake_output() nor
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* psa_pake_input() has been called yet). It must
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* be on operation for which the peer ID hasn't
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* been set (psa_pake_set_peer() hasn't been
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* called yet).
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* \param[in] peer_id The peer's ID to authenticate.
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* \param peer_id_len Size of the \p peer_id buffer in bytes.
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*
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* \retval #PSA_SUCCESS
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* Success.
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* \retval #PSA_ERROR_INVALID_ARGUMENT
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* \p user_id is not valid for the \p operation's algorithm and cipher
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* suite.
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* \retval #PSA_ERROR_NOT_SUPPORTED
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* The algorithm doesn't associate a second identity with the session.
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* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
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* \retval #PSA_ERROR_COMMUNICATION_FAILURE
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* \retval #PSA_ERROR_CORRUPTION_DETECTED
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* \retval #PSA_ERROR_BAD_STATE
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* Calling psa_pake_set_peer() is invalid with the \p operation's
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* algorithm, the operation state is not valid, or the library has not
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* been previously initialized by psa_crypto_init().
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* It is implementation-dependent whether a failure to initialize
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* results in this error code.
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*/
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psa_status_t mbedtls_psa_pake_set_peer(psa_pake_operation_t *operation,
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const uint8_t *peer_id,
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size_t peer_id_len);
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/** Set the application role for a password-authenticated key exchange.
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*
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* Not all PAKE algorithms need to differentiate the communicating entities.
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* It is optional to call this function for PAKEs that don't require a role
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* to be specified. For such PAKEs the application role parameter is ignored,
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* or #PSA_PAKE_ROLE_NONE can be passed as \c role.
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*
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* Refer to the documentation of individual PAKE algorithm types (`PSA_ALG_XXX`
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* values of type ::psa_algorithm_t such that #PSA_ALG_IS_PAKE(\c alg) is true)
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* for more information.
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*
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* \param[in,out] operation The operation object to specify the
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* application's role for. It must have been set up
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* by psa_pake_setup() and not yet in use (neither
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* psa_pake_output() nor psa_pake_input() has been
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* called yet). It must be on operation for which
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* the application's role hasn't been specified
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* (psa_pake_set_role() hasn't been called yet).
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* \param role A value of type ::psa_pake_role_t indicating the
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* application's role in the PAKE the algorithm
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* that is being set up. For more information see
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* the documentation of \c PSA_PAKE_ROLE_XXX
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* constants.
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*
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* \retval #PSA_SUCCESS
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* Success.
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* \retval #PSA_ERROR_INVALID_ARGUMENT
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* The \p role is not a valid PAKE role in the \p operation’s algorithm.
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* \retval #PSA_ERROR_NOT_SUPPORTED
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* The \p role for this algorithm is not supported or is not valid.
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* \retval #PSA_ERROR_COMMUNICATION_FAILURE
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* \retval #PSA_ERROR_CORRUPTION_DETECTED
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* \retval #PSA_ERROR_BAD_STATE
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* The operation state is not valid, or
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* the library has not been previously initialized by psa_crypto_init().
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* It is implementation-dependent whether a failure to initialize
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* results in this error code.
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*/
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psa_status_t mbedtls_psa_pake_set_role(psa_pake_operation_t *operation,
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psa_pake_role_t role);
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/** Get output for a step of a password-authenticated key exchange.
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*
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* Depending on the algorithm being executed, you might need to call this
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* function several times or you might not need to call this at all.
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*
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* The exact sequence of calls to perform a password-authenticated key
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* exchange depends on the algorithm in use. Refer to the documentation of
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* individual PAKE algorithm types (`PSA_ALG_XXX` values of type
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* ::psa_algorithm_t such that #PSA_ALG_IS_PAKE(\c alg) is true) for more
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* information.
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*
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* If this function returns an error status, the operation enters an error
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* state and must be aborted by calling psa_pake_abort().
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*
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* \param[in,out] operation Active PAKE operation.
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* \param step The step of the algorithm for which the output is
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* requested.
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* \param[out] output Buffer where the output is to be written in the
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* format appropriate for this \p step. Refer to
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* the documentation of the individual
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* \c PSA_PAKE_STEP_XXX constants for more
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* information.
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* \param output_size Size of the \p output buffer in bytes. This must
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* be at least #PSA_PAKE_OUTPUT_SIZE(\p alg, \p
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* primitive, \p step) where \p alg and
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* \p primitive are the PAKE algorithm and primitive
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* in the operation's cipher suite, and \p step is
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* the output step.
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*
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* \param[out] output_length On success, the number of bytes of the returned
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* output.
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*
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* \retval #PSA_SUCCESS
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* Success.
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* \retval #PSA_ERROR_BUFFER_TOO_SMALL
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* The size of the \p output buffer is too small.
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* \retval #PSA_ERROR_INVALID_ARGUMENT
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* \p step is not compatible with the operation's algorithm.
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* \retval #PSA_ERROR_NOT_SUPPORTED
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* \p step is not supported with the operation's algorithm.
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* \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
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* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
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* \retval #PSA_ERROR_COMMUNICATION_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_DATA_CORRUPT
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* \retval #PSA_ERROR_DATA_INVALID
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* \retval #PSA_ERROR_BAD_STATE
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* The operation state is not valid (it must be active, and fully set
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* up, and this call must conform to the algorithm's requirements
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* for ordering of input and output steps), or
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* the library has not been previously initialized by psa_crypto_init().
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* It is implementation-dependent whether a failure to initialize
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* results in this error code.
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*/
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psa_status_t mbedtls_psa_pake_output(psa_pake_operation_t *operation,
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psa_pake_step_t step,
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uint8_t *output,
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size_t output_size,
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size_t *output_length);
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/** Provide input for a step of a password-authenticated key exchange.
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*
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* Depending on the algorithm being executed, you might need to call this
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* function several times or you might not need to call this at all.
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*
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* The exact sequence of calls to perform a password-authenticated key
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* exchange depends on the algorithm in use. Refer to the documentation of
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* individual PAKE algorithm types (`PSA_ALG_XXX` values of type
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* ::psa_algorithm_t such that #PSA_ALG_IS_PAKE(\c alg) is true) for more
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* information.
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*
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* If this function returns an error status, the operation enters an error
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* state and must be aborted by calling psa_pake_abort().
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*
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* \param[in,out] operation Active PAKE operation.
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* \param step The step for which the input is provided.
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* \param[in] input Buffer containing the input in the format
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* appropriate for this \p step. Refer to the
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* documentation of the individual
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* \c PSA_PAKE_STEP_XXX constants for more
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* information.
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* \param input_length Size of the \p input buffer in bytes.
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*
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* \retval #PSA_SUCCESS
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* Success.
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* \retval #PSA_ERROR_INVALID_SIGNATURE
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* The verification fails for a #PSA_PAKE_STEP_ZK_PROOF input step.
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* \retval #PSA_ERROR_INVALID_ARGUMENT
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* \p is not compatible with the \p operation’s algorithm, or the
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* \p input is not valid for the \p operation's algorithm, cipher suite
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* or \p step.
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* \retval #PSA_ERROR_NOT_SUPPORTED
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* \p step p is not supported with the \p operation's algorithm, or the
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* \p input is not supported for the \p operation's algorithm, cipher
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* suite or \p step.
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* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
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* \retval #PSA_ERROR_COMMUNICATION_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_DATA_CORRUPT
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* \retval #PSA_ERROR_DATA_INVALID
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* \retval #PSA_ERROR_BAD_STATE
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* The operation state is not valid (it must be active, and fully set
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* up, and this call must conform to the algorithm's requirements
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* for ordering of input and output steps), or
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* the library has not been previously initialized by psa_crypto_init().
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* It is implementation-dependent whether a failure to initialize
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* results in this error code.
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*/
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psa_status_t mbedtls_psa_pake_input(psa_pake_operation_t *operation,
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psa_pake_step_t step,
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const uint8_t *input,
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size_t input_length);
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/** Get implicitly confirmed shared secret from a PAKE.
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*
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* At this point there is a cryptographic guarantee that only the authenticated
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* party who used the same password is able to compute the key. But there is no
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* guarantee that the peer is the party it claims to be and was able to do so.
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*
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* That is, the authentication is only implicit. Since the peer is not
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* authenticated yet, no action should be taken yet that assumes that the peer
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* is who it claims to be. For example, do not access restricted files on the
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* peer's behalf until an explicit authentication has succeeded.
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*
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* This function can be called after the key exchange phase of the operation
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* has completed. It imports the shared secret output of the PAKE into the
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* provided derivation operation. The input step
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* #PSA_KEY_DERIVATION_INPUT_SECRET is used when placing the shared key
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* material in the key derivation operation.
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*
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* The exact sequence of calls to perform a password-authenticated key
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* exchange depends on the algorithm in use. Refer to the documentation of
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* individual PAKE algorithm types (`PSA_ALG_XXX` values of type
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* ::psa_algorithm_t such that #PSA_ALG_IS_PAKE(\c alg) is true) for more
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* information.
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*
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* When this function returns successfully, \p operation becomes inactive.
|
||
* If this function returns an error status, both \p operation
|
||
* and \p key_derivation operations enter an error state and must be aborted by
|
||
* calling psa_pake_abort() and psa_key_derivation_abort() respectively.
|
||
*
|
||
* \param[in,out] operation Active PAKE operation.
|
||
* \param[out] output A key derivation operation that is ready
|
||
* for an input step of type
|
||
* #PSA_KEY_DERIVATION_INPUT_SECRET.
|
||
*
|
||
* \retval #PSA_SUCCESS
|
||
* Success.
|
||
* \retval #PSA_ERROR_INVALID_ARGUMENT
|
||
* #PSA_KEY_DERIVATION_INPUT_SECRET is not compatible with the
|
||
* algorithm in the \p output key derivation operation.
|
||
* \retval #PSA_ERROR_NOT_SUPPORTED
|
||
* Input from a PAKE is not supported by the algorithm in the \p output
|
||
* key derivation operation.
|
||
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
|
||
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
|
||
* \retval #PSA_ERROR_CORRUPTION_DETECTED
|
||
* \retval #PSA_ERROR_STORAGE_FAILURE
|
||
* \retval #PSA_ERROR_DATA_CORRUPT
|
||
* \retval #PSA_ERROR_DATA_INVALID
|
||
* \retval #PSA_ERROR_BAD_STATE
|
||
* The PAKE operation state is not valid (it must be active, but beyond
|
||
* that validity is specific to the algorithm), or
|
||
* the library has not been previously initialized by psa_crypto_init(),
|
||
* or the state of \p output is not valid for
|
||
* the #PSA_KEY_DERIVATION_INPUT_SECRET step. This can happen if the
|
||
* step is out of order or the application has done this step already
|
||
* and it may not be repeated.
|
||
* It is implementation-dependent whether a failure to initialize
|
||
* results in this error code.
|
||
*/
|
||
psa_status_t mbedtls_psa_pake_get_implicit_key(
|
||
psa_pake_operation_t *operation,
|
||
psa_key_derivation_operation_t *output);
|
||
|
||
/** Abort a PAKE operation.
|
||
*
|
||
* Aborting an operation frees all associated resources except for the \c
|
||
* operation structure itself. Once aborted, the operation object can be reused
|
||
* for another operation by calling psa_pake_setup() again.
|
||
*
|
||
* This function may be called at any time after the operation
|
||
* object has been initialized as described in #psa_pake_operation_t.
|
||
*
|
||
* In particular, calling psa_pake_abort() after the operation has been
|
||
* terminated by a call to psa_pake_abort() or psa_pake_get_implicit_key()
|
||
* is safe and has no effect.
|
||
*
|
||
* \param[in,out] operation The operation to abort.
|
||
*
|
||
* \retval #PSA_SUCCESS
|
||
* Success.
|
||
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
|
||
* \retval #PSA_ERROR_CORRUPTION_DETECTED
|
||
* \retval #PSA_ERROR_BAD_STATE
|
||
* The library has not been previously initialized by psa_crypto_init().
|
||
* It is implementation-dependent whether a failure to initialize
|
||
* results in this error code.
|
||
*/
|
||
psa_status_t mbedtls_psa_pake_abort(psa_pake_operation_t *operation);
|
||
|
||
#endif /* PSA_CRYPTO_PAKE_H */
|