605 lines
28 KiB
C
605 lines
28 KiB
C
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/**
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* \file ecdsa.h
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*
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* \brief This file contains ECDSA definitions and functions.
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*
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* The Elliptic Curve Digital Signature Algorithm (ECDSA) is defined in
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* <em>Standards for Efficient Cryptography Group (SECG):
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* SEC1 Elliptic Curve Cryptography</em>.
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* The use of ECDSA for TLS is defined in <em>RFC-4492: Elliptic Curve
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* Cryptography (ECC) Cipher Suites for Transport Layer Security (TLS)</em>.
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*
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*/
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/*
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* Copyright (C) 2006-2018, Arm Limited (or its affiliates), All Rights Reserved
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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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* This file is part of Mbed TLS (https://tls.mbed.org)
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*/
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#ifndef MBEDTLS_ECDSA_H
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#define MBEDTLS_ECDSA_H
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#include "ecp.h"
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#include "md.h"
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/*
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* RFC-4492 page 20:
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*
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* Ecdsa-Sig-Value ::= SEQUENCE {
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* r INTEGER,
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* s INTEGER
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* }
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*
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* Size is at most
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* 1 (tag) + 1 (len) + 1 (initial 0) + ECP_MAX_BYTES for each of r and s,
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* twice that + 1 (tag) + 2 (len) for the sequence
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* (assuming ECP_MAX_BYTES is less than 126 for r and s,
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* and less than 124 (total len <= 255) for the sequence)
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*/
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#if MBEDTLS_ECP_MAX_BYTES > 124
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#error "MBEDTLS_ECP_MAX_BYTES bigger than expected, please fix MBEDTLS_ECDSA_MAX_LEN"
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#endif
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/** The maximal size of an ECDSA signature in Bytes. */
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#define MBEDTLS_ECDSA_MAX_LEN ( 3 + 2 * ( 3 + MBEDTLS_ECP_MAX_BYTES ) )
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief The ECDSA context structure.
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*
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* \warning Performing multiple operations concurrently on the same
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* ECDSA context is not supported; objects of this type
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* should not be shared between multiple threads.
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*/
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typedef mbedtls_ecp_keypair mbedtls_ecdsa_context;
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#if defined(MBEDTLS_ECP_RESTARTABLE)
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/**
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* \brief Internal restart context for ecdsa_verify()
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*
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* \note Opaque struct, defined in ecdsa.c
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*/
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typedef struct mbedtls_ecdsa_restart_ver mbedtls_ecdsa_restart_ver_ctx;
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/**
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* \brief Internal restart context for ecdsa_sign()
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*
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* \note Opaque struct, defined in ecdsa.c
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*/
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typedef struct mbedtls_ecdsa_restart_sig mbedtls_ecdsa_restart_sig_ctx;
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#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
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/**
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* \brief Internal restart context for ecdsa_sign_det()
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*
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* \note Opaque struct, defined in ecdsa.c
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*/
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typedef struct mbedtls_ecdsa_restart_det mbedtls_ecdsa_restart_det_ctx;
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#endif
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/**
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* \brief General context for resuming ECDSA operations
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*/
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typedef struct
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{
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mbedtls_ecp_restart_ctx ecp; /*!< base context for ECP restart and
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shared administrative info */
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mbedtls_ecdsa_restart_ver_ctx *ver; /*!< ecdsa_verify() sub-context */
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mbedtls_ecdsa_restart_sig_ctx *sig; /*!< ecdsa_sign() sub-context */
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#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
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mbedtls_ecdsa_restart_det_ctx *det; /*!< ecdsa_sign_det() sub-context */
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#endif
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} mbedtls_ecdsa_restart_ctx;
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#else /* MBEDTLS_ECP_RESTARTABLE */
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/* Now we can declare functions that take a pointer to that */
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typedef void mbedtls_ecdsa_restart_ctx;
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#endif /* MBEDTLS_ECP_RESTARTABLE */
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/**
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* \brief This function computes the ECDSA signature of a
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* previously-hashed message.
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*
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* \note The deterministic version implemented in
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* mbedtls_ecdsa_sign_det() is usually preferred.
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*
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* \note If the bitlength of the message hash is larger than the
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* bitlength of the group order, then the hash is truncated
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* as defined in <em>Standards for Efficient Cryptography Group
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* (SECG): SEC1 Elliptic Curve Cryptography</em>, section
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* 4.1.3, step 5.
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*
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* \see ecp.h
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*
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* \param grp The context for the elliptic curve to use.
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* This must be initialized and have group parameters
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* set, for example through mbedtls_ecp_group_load().
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* \param r The MPI context in which to store the first part
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* the signature. This must be initialized.
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* \param s The MPI context in which to store the second part
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* the signature. This must be initialized.
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* \param d The private signing key. This must be initialized.
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* \param buf The content to be signed. This is usually the hash of
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* the original data to be signed. This must be a readable
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* buffer of length \p blen Bytes. It may be \c NULL if
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* \p blen is zero.
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* \param blen The length of \p buf in Bytes.
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* \param f_rng The RNG function. This must not be \c NULL.
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* \param p_rng The RNG context to be passed to \p f_rng. This may be
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* \c NULL if \p f_rng doesn't need a context parameter.
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*
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* \return \c 0 on success.
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* \return An \c MBEDTLS_ERR_ECP_XXX
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* or \c MBEDTLS_MPI_XXX error code on failure.
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*/
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int mbedtls_ecdsa_sign( mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s,
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const mbedtls_mpi *d, const unsigned char *buf, size_t blen,
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int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
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#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
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/**
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* \brief This function computes the ECDSA signature of a
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* previously-hashed message, deterministic version.
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*
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* For more information, see <em>RFC-6979: Deterministic
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* Usage of the Digital Signature Algorithm (DSA) and Elliptic
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* Curve Digital Signature Algorithm (ECDSA)</em>.
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*
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* \note If the bitlength of the message hash is larger than the
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* bitlength of the group order, then the hash is truncated as
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* defined in <em>Standards for Efficient Cryptography Group
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* (SECG): SEC1 Elliptic Curve Cryptography</em>, section
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* 4.1.3, step 5.
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*
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* \warning Since the output of the internal RNG is always the same for
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* the same key and message, this limits the efficiency of
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* blinding and leaks information through side channels. For
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* secure behavior use mbedtls_ecdsa_sign_det_ext() instead.
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*
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* (Optimally the blinding is a random value that is different
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* on every execution. In this case the blinding is still
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* random from the attackers perspective, but is the same on
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* each execution. This means that this blinding does not
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* prevent attackers from recovering secrets by combining
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* several measurement traces, but may prevent some attacks
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* that exploit relationships between secret data.)
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*
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* \see ecp.h
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*
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* \param grp The context for the elliptic curve to use.
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* This must be initialized and have group parameters
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* set, for example through mbedtls_ecp_group_load().
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* \param r The MPI context in which to store the first part
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* the signature. This must be initialized.
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* \param s The MPI context in which to store the second part
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* the signature. This must be initialized.
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* \param d The private signing key. This must be initialized
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* and setup, for example through mbedtls_ecp_gen_privkey().
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* \param buf The hashed content to be signed. This must be a readable
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* buffer of length \p blen Bytes. It may be \c NULL if
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* \p blen is zero.
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* \param blen The length of \p buf in Bytes.
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* \param md_alg The hash algorithm used to hash the original data.
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*
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* \return \c 0 on success.
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* \return An \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_MPI_XXX
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* error code on failure.
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*/
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int mbedtls_ecdsa_sign_det( mbedtls_ecp_group *grp, mbedtls_mpi *r,
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mbedtls_mpi *s, const mbedtls_mpi *d,
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const unsigned char *buf, size_t blen,
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mbedtls_md_type_t md_alg );
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/**
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* \brief This function computes the ECDSA signature of a
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* previously-hashed message, deterministic version.
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*
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* For more information, see <em>RFC-6979: Deterministic
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* Usage of the Digital Signature Algorithm (DSA) and Elliptic
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* Curve Digital Signature Algorithm (ECDSA)</em>.
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*
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* \note If the bitlength of the message hash is larger than the
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* bitlength of the group order, then the hash is truncated as
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* defined in <em>Standards for Efficient Cryptography Group
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* (SECG): SEC1 Elliptic Curve Cryptography</em>, section
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* 4.1.3, step 5.
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*
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* \see ecp.h
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*
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* \param grp The context for the elliptic curve to use.
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* This must be initialized and have group parameters
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* set, for example through mbedtls_ecp_group_load().
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* \param r The MPI context in which to store the first part
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* the signature. This must be initialized.
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* \param s The MPI context in which to store the second part
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* the signature. This must be initialized.
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* \param d The private signing key. This must be initialized
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* and setup, for example through mbedtls_ecp_gen_privkey().
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* \param buf The hashed content to be signed. This must be a readable
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* buffer of length \p blen Bytes. It may be \c NULL if
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* \p blen is zero.
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* \param blen The length of \p buf in Bytes.
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* \param md_alg The hash algorithm used to hash the original data.
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* \param f_rng_blind The RNG function used for blinding. This must not be
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* \c NULL.
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* \param p_rng_blind The RNG context to be passed to \p f_rng. This may be
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* \c NULL if \p f_rng doesn't need a context parameter.
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*
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* \return \c 0 on success.
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* \return An \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_MPI_XXX
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* error code on failure.
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*/
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int mbedtls_ecdsa_sign_det_ext( mbedtls_ecp_group *grp, mbedtls_mpi *r,
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mbedtls_mpi *s, const mbedtls_mpi *d,
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const unsigned char *buf, size_t blen,
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mbedtls_md_type_t md_alg,
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int (*f_rng_blind)(void *, unsigned char *,
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size_t),
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void *p_rng_blind );
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#endif /* MBEDTLS_ECDSA_DETERMINISTIC */
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/**
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* \brief This function verifies the ECDSA signature of a
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* previously-hashed message.
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*
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* \note If the bitlength of the message hash is larger than the
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* bitlength of the group order, then the hash is truncated as
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* defined in <em>Standards for Efficient Cryptography Group
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* (SECG): SEC1 Elliptic Curve Cryptography</em>, section
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* 4.1.4, step 3.
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*
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* \see ecp.h
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*
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* \param grp The ECP group to use.
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* This must be initialized and have group parameters
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* set, for example through mbedtls_ecp_group_load().
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* \param buf The hashed content that was signed. This must be a readable
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* buffer of length \p blen Bytes. It may be \c NULL if
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* \p blen is zero.
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* \param blen The length of \p buf in Bytes.
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* \param Q The public key to use for verification. This must be
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* initialized and setup.
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* \param r The first integer of the signature.
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* This must be initialized.
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* \param s The second integer of the signature.
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* This must be initialized.
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if the signature
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* is invalid.
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* \return An \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_MPI_XXX
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* error code on failure for any other reason.
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*/
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int mbedtls_ecdsa_verify( mbedtls_ecp_group *grp,
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const unsigned char *buf, size_t blen,
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const mbedtls_ecp_point *Q, const mbedtls_mpi *r,
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const mbedtls_mpi *s);
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/**
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* \brief This function computes the ECDSA signature and writes it
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* to a buffer, serialized as defined in <em>RFC-4492:
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* Elliptic Curve Cryptography (ECC) Cipher Suites for
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* Transport Layer Security (TLS)</em>.
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*
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* \warning It is not thread-safe to use the same context in
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* multiple threads.
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*
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* \note The deterministic version is used if
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* #MBEDTLS_ECDSA_DETERMINISTIC is defined. For more
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* information, see <em>RFC-6979: Deterministic Usage
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* of the Digital Signature Algorithm (DSA) and Elliptic
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* Curve Digital Signature Algorithm (ECDSA)</em>.
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*
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* \note If the bitlength of the message hash is larger than the
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* bitlength of the group order, then the hash is truncated as
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* defined in <em>Standards for Efficient Cryptography Group
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* (SECG): SEC1 Elliptic Curve Cryptography</em>, section
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* 4.1.3, step 5.
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*
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* \see ecp.h
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*
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* \param ctx The ECDSA context to use. This must be initialized
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* and have a group and private key bound to it, for example
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* via mbedtls_ecdsa_genkey() or mbedtls_ecdsa_from_keypair().
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* \param md_alg The message digest that was used to hash the message.
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* \param hash The message hash to be signed. This must be a readable
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* buffer of length \p blen Bytes.
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* \param hlen The length of the hash \p hash in Bytes.
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* \param sig The buffer to which to write the signature. This must be a
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* writable buffer of length at least twice as large as the
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|
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* size of the curve used, plus 9. For example, 73 Bytes if
|
||
|
|
* a 256-bit curve is used. A buffer length of
|
||
|
|
* #MBEDTLS_ECDSA_MAX_LEN is always safe.
|
||
|
|
* \param slen The address at which to store the actual length of
|
||
|
|
* the signature written. Must not be \c NULL.
|
||
|
|
* \param f_rng The RNG function. This must not be \c NULL if
|
||
|
|
* #MBEDTLS_ECDSA_DETERMINISTIC is unset. Otherwise,
|
||
|
|
* it is unused and may be set to \c NULL.
|
||
|
|
* \param p_rng The RNG context to be passed to \p f_rng. This may be
|
||
|
|
* \c NULL if \p f_rng is \c NULL or doesn't use a context.
|
||
|
|
*
|
||
|
|
* \return \c 0 on success.
|
||
|
|
* \return An \c MBEDTLS_ERR_ECP_XXX, \c MBEDTLS_ERR_MPI_XXX or
|
||
|
|
* \c MBEDTLS_ERR_ASN1_XXX error code on failure.
|
||
|
|
*/
|
||
|
|
int mbedtls_ecdsa_write_signature( mbedtls_ecdsa_context *ctx,
|
||
|
|
mbedtls_md_type_t md_alg,
|
||
|
|
const unsigned char *hash, size_t hlen,
|
||
|
|
unsigned char *sig, size_t *slen,
|
||
|
|
int (*f_rng)(void *, unsigned char *, size_t),
|
||
|
|
void *p_rng );
|
||
|
|
|
||
|
|
/**
|
||
|
|
* \brief This function computes the ECDSA signature and writes it
|
||
|
|
* to a buffer, in a restartable way.
|
||
|
|
*
|
||
|
|
* \see \c mbedtls_ecdsa_write_signature()
|
||
|
|
*
|
||
|
|
* \note This function is like \c mbedtls_ecdsa_write_signature()
|
||
|
|
* but it can return early and restart according to the limit
|
||
|
|
* set with \c mbedtls_ecp_set_max_ops() to reduce blocking.
|
||
|
|
*
|
||
|
|
* \param ctx The ECDSA context to use. This must be initialized
|
||
|
|
* and have a group and private key bound to it, for example
|
||
|
|
* via mbedtls_ecdsa_genkey() or mbedtls_ecdsa_from_keypair().
|
||
|
|
* \param md_alg The message digest that was used to hash the message.
|
||
|
|
* \param hash The message hash to be signed. This must be a readable
|
||
|
|
* buffer of length \p blen Bytes.
|
||
|
|
* \param hlen The length of the hash \p hash in Bytes.
|
||
|
|
* \param sig The buffer to which to write the signature. This must be a
|
||
|
|
* writable buffer of length at least twice as large as the
|
||
|
|
* size of the curve used, plus 9. For example, 73 Bytes if
|
||
|
|
* a 256-bit curve is used. A buffer length of
|
||
|
|
* #MBEDTLS_ECDSA_MAX_LEN is always safe.
|
||
|
|
* \param slen The address at which to store the actual length of
|
||
|
|
* the signature written. Must not be \c NULL.
|
||
|
|
* \param f_rng The RNG function. This must not be \c NULL if
|
||
|
|
* #MBEDTLS_ECDSA_DETERMINISTIC is unset. Otherwise,
|
||
|
|
* it is unused and may be set to \c NULL.
|
||
|
|
* \param p_rng The RNG context to be passed to \p f_rng. This may be
|
||
|
|
* \c NULL if \p f_rng is \c NULL or doesn't use a context.
|
||
|
|
* \param rs_ctx The restart context to use. This may be \c NULL to disable
|
||
|
|
* restarting. If it is not \c NULL, it must point to an
|
||
|
|
* initialized restart context.
|
||
|
|
*
|
||
|
|
* \return \c 0 on success.
|
||
|
|
* \return #MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of
|
||
|
|
* operations was reached: see \c mbedtls_ecp_set_max_ops().
|
||
|
|
* \return Another \c MBEDTLS_ERR_ECP_XXX, \c MBEDTLS_ERR_MPI_XXX or
|
||
|
|
* \c MBEDTLS_ERR_ASN1_XXX error code on failure.
|
||
|
|
*/
|
||
|
|
int mbedtls_ecdsa_write_signature_restartable( mbedtls_ecdsa_context *ctx,
|
||
|
|
mbedtls_md_type_t md_alg,
|
||
|
|
const unsigned char *hash, size_t hlen,
|
||
|
|
unsigned char *sig, size_t *slen,
|
||
|
|
int (*f_rng)(void *, unsigned char *, size_t),
|
||
|
|
void *p_rng,
|
||
|
|
mbedtls_ecdsa_restart_ctx *rs_ctx );
|
||
|
|
|
||
|
|
#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
|
||
|
|
#if ! defined(MBEDTLS_DEPRECATED_REMOVED)
|
||
|
|
#if defined(MBEDTLS_DEPRECATED_WARNING)
|
||
|
|
#define MBEDTLS_DEPRECATED __attribute__((deprecated))
|
||
|
|
#else
|
||
|
|
#define MBEDTLS_DEPRECATED
|
||
|
|
#endif
|
||
|
|
/**
|
||
|
|
* \brief This function computes an ECDSA signature and writes
|
||
|
|
* it to a buffer, serialized as defined in <em>RFC-4492:
|
||
|
|
* Elliptic Curve Cryptography (ECC) Cipher Suites for
|
||
|
|
* Transport Layer Security (TLS)</em>.
|
||
|
|
*
|
||
|
|
* The deterministic version is defined in <em>RFC-6979:
|
||
|
|
* Deterministic Usage of the Digital Signature Algorithm (DSA)
|
||
|
|
* and Elliptic Curve Digital Signature Algorithm (ECDSA)</em>.
|
||
|
|
*
|
||
|
|
* \warning It is not thread-safe to use the same context in
|
||
|
|
* multiple threads.
|
||
|
|
*
|
||
|
|
* \note If the bitlength of the message hash is larger than the
|
||
|
|
* bitlength of the group order, then the hash is truncated as
|
||
|
|
* defined in <em>Standards for Efficient Cryptography Group
|
||
|
|
* (SECG): SEC1 Elliptic Curve Cryptography</em>, section
|
||
|
|
* 4.1.3, step 5.
|
||
|
|
*
|
||
|
|
* \see ecp.h
|
||
|
|
*
|
||
|
|
* \deprecated Superseded by mbedtls_ecdsa_write_signature() in
|
||
|
|
* Mbed TLS version 2.0 and later.
|
||
|
|
*
|
||
|
|
* \param ctx The ECDSA context to use. This must be initialized
|
||
|
|
* and have a group and private key bound to it, for example
|
||
|
|
* via mbedtls_ecdsa_genkey() or mbedtls_ecdsa_from_keypair().
|
||
|
|
* \param hash The message hash to be signed. This must be a readable
|
||
|
|
* buffer of length \p blen Bytes.
|
||
|
|
* \param hlen The length of the hash \p hash in Bytes.
|
||
|
|
* \param sig The buffer to which to write the signature. This must be a
|
||
|
|
* writable buffer of length at least twice as large as the
|
||
|
|
* size of the curve used, plus 9. For example, 73 Bytes if
|
||
|
|
* a 256-bit curve is used. A buffer length of
|
||
|
|
* #MBEDTLS_ECDSA_MAX_LEN is always safe.
|
||
|
|
* \param slen The address at which to store the actual length of
|
||
|
|
* the signature written. Must not be \c NULL.
|
||
|
|
* \param md_alg The message digest that was used to hash the message.
|
||
|
|
*
|
||
|
|
* \return \c 0 on success.
|
||
|
|
* \return An \c MBEDTLS_ERR_ECP_XXX, \c MBEDTLS_ERR_MPI_XXX or
|
||
|
|
* \c MBEDTLS_ERR_ASN1_XXX error code on failure.
|
||
|
|
*/
|
||
|
|
int mbedtls_ecdsa_write_signature_det( mbedtls_ecdsa_context *ctx,
|
||
|
|
const unsigned char *hash, size_t hlen,
|
||
|
|
unsigned char *sig, size_t *slen,
|
||
|
|
mbedtls_md_type_t md_alg ) MBEDTLS_DEPRECATED;
|
||
|
|
#undef MBEDTLS_DEPRECATED
|
||
|
|
#endif /* MBEDTLS_DEPRECATED_REMOVED */
|
||
|
|
#endif /* MBEDTLS_ECDSA_DETERMINISTIC */
|
||
|
|
|
||
|
|
/**
|
||
|
|
* \brief This function reads and verifies an ECDSA signature.
|
||
|
|
*
|
||
|
|
* \note If the bitlength of the message hash is larger than the
|
||
|
|
* bitlength of the group order, then the hash is truncated as
|
||
|
|
* defined in <em>Standards for Efficient Cryptography Group
|
||
|
|
* (SECG): SEC1 Elliptic Curve Cryptography</em>, section
|
||
|
|
* 4.1.4, step 3.
|
||
|
|
*
|
||
|
|
* \see ecp.h
|
||
|
|
*
|
||
|
|
* \param ctx The ECDSA context to use. This must be initialized
|
||
|
|
* and have a group and public key bound to it.
|
||
|
|
* \param hash The message hash that was signed. This must be a readable
|
||
|
|
* buffer of length \p size Bytes.
|
||
|
|
* \param hlen The size of the hash \p hash.
|
||
|
|
* \param sig The signature to read and verify. This must be a readable
|
||
|
|
* buffer of length \p slen Bytes.
|
||
|
|
* \param slen The size of \p sig in Bytes.
|
||
|
|
*
|
||
|
|
* \return \c 0 on success.
|
||
|
|
* \return #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if signature is invalid.
|
||
|
|
* \return #MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH if there is a valid
|
||
|
|
* signature in \p sig, but its length is less than \p siglen.
|
||
|
|
* \return An \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_ERR_MPI_XXX
|
||
|
|
* error code on failure for any other reason.
|
||
|
|
*/
|
||
|
|
int mbedtls_ecdsa_read_signature( mbedtls_ecdsa_context *ctx,
|
||
|
|
const unsigned char *hash, size_t hlen,
|
||
|
|
const unsigned char *sig, size_t slen );
|
||
|
|
|
||
|
|
/**
|
||
|
|
* \brief This function reads and verifies an ECDSA signature,
|
||
|
|
* in a restartable way.
|
||
|
|
*
|
||
|
|
* \see \c mbedtls_ecdsa_read_signature()
|
||
|
|
*
|
||
|
|
* \note This function is like \c mbedtls_ecdsa_read_signature()
|
||
|
|
* but it can return early and restart according to the limit
|
||
|
|
* set with \c mbedtls_ecp_set_max_ops() to reduce blocking.
|
||
|
|
*
|
||
|
|
* \param ctx The ECDSA context to use. This must be initialized
|
||
|
|
* and have a group and public key bound to it.
|
||
|
|
* \param hash The message hash that was signed. This must be a readable
|
||
|
|
* buffer of length \p size Bytes.
|
||
|
|
* \param hlen The size of the hash \p hash.
|
||
|
|
* \param sig The signature to read and verify. This must be a readable
|
||
|
|
* buffer of length \p slen Bytes.
|
||
|
|
* \param slen The size of \p sig in Bytes.
|
||
|
|
* \param rs_ctx The restart context to use. This may be \c NULL to disable
|
||
|
|
* restarting. If it is not \c NULL, it must point to an
|
||
|
|
* initialized restart context.
|
||
|
|
*
|
||
|
|
* \return \c 0 on success.
|
||
|
|
* \return #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if signature is invalid.
|
||
|
|
* \return #MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH if there is a valid
|
||
|
|
* signature in \p sig, but its length is less than \p siglen.
|
||
|
|
* \return #MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of
|
||
|
|
* operations was reached: see \c mbedtls_ecp_set_max_ops().
|
||
|
|
* \return Another \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_ERR_MPI_XXX
|
||
|
|
* error code on failure for any other reason.
|
||
|
|
*/
|
||
|
|
int mbedtls_ecdsa_read_signature_restartable( mbedtls_ecdsa_context *ctx,
|
||
|
|
const unsigned char *hash, size_t hlen,
|
||
|
|
const unsigned char *sig, size_t slen,
|
||
|
|
mbedtls_ecdsa_restart_ctx *rs_ctx );
|
||
|
|
|
||
|
|
/**
|
||
|
|
* \brief This function generates an ECDSA keypair on the given curve.
|
||
|
|
*
|
||
|
|
* \see ecp.h
|
||
|
|
*
|
||
|
|
* \param ctx The ECDSA context to store the keypair in.
|
||
|
|
* This must be initialized.
|
||
|
|
* \param gid The elliptic curve to use. One of the various
|
||
|
|
* \c MBEDTLS_ECP_DP_XXX macros depending on configuration.
|
||
|
|
* \param f_rng The RNG function to use. This must not be \c NULL.
|
||
|
|
* \param p_rng The RNG context to be passed to \p f_rng. This may be
|
||
|
|
* \c NULL if \p f_rng doesn't need a context argument.
|
||
|
|
*
|
||
|
|
* \return \c 0 on success.
|
||
|
|
* \return An \c MBEDTLS_ERR_ECP_XXX code on failure.
|
||
|
|
*/
|
||
|
|
int mbedtls_ecdsa_genkey( mbedtls_ecdsa_context *ctx, mbedtls_ecp_group_id gid,
|
||
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
|
||
|
|
|
||
|
|
/**
|
||
|
|
* \brief This function sets up an ECDSA context from an EC key pair.
|
||
|
|
*
|
||
|
|
* \see ecp.h
|
||
|
|
*
|
||
|
|
* \param ctx The ECDSA context to setup. This must be initialized.
|
||
|
|
* \param key The EC key to use. This must be initialized and hold
|
||
|
|
* a private-public key pair or a public key. In the former
|
||
|
|
* case, the ECDSA context may be used for signature creation
|
||
|
|
* and verification after this call. In the latter case, it
|
||
|
|
* may be used for signature verification.
|
||
|
|
*
|
||
|
|
* \return \c 0 on success.
|
||
|
|
* \return An \c MBEDTLS_ERR_ECP_XXX code on failure.
|
||
|
|
*/
|
||
|
|
int mbedtls_ecdsa_from_keypair( mbedtls_ecdsa_context *ctx,
|
||
|
|
const mbedtls_ecp_keypair *key );
|
||
|
|
|
||
|
|
/**
|
||
|
|
* \brief This function initializes an ECDSA context.
|
||
|
|
*
|
||
|
|
* \param ctx The ECDSA context to initialize.
|
||
|
|
* This must not be \c NULL.
|
||
|
|
*/
|
||
|
|
void mbedtls_ecdsa_init( mbedtls_ecdsa_context *ctx );
|
||
|
|
|
||
|
|
/**
|
||
|
|
* \brief This function frees an ECDSA context.
|
||
|
|
*
|
||
|
|
* \param ctx The ECDSA context to free. This may be \c NULL,
|
||
|
|
* in which case this function does nothing. If it
|
||
|
|
* is not \c NULL, it must be initialized.
|
||
|
|
*/
|
||
|
|
void mbedtls_ecdsa_free( mbedtls_ecdsa_context *ctx );
|
||
|
|
|
||
|
|
#if defined(MBEDTLS_ECP_RESTARTABLE)
|
||
|
|
/**
|
||
|
|
* \brief Initialize a restart context.
|
||
|
|
*
|
||
|
|
* \param ctx The restart context to initialize.
|
||
|
|
* This must not be \c NULL.
|
||
|
|
*/
|
||
|
|
void mbedtls_ecdsa_restart_init( mbedtls_ecdsa_restart_ctx *ctx );
|
||
|
|
|
||
|
|
/**
|
||
|
|
* \brief Free the components of a restart context.
|
||
|
|
*
|
||
|
|
* \param ctx The restart context to free. This may be \c NULL,
|
||
|
|
* in which case this function does nothing. If it
|
||
|
|
* is not \c NULL, it must be initialized.
|
||
|
|
*/
|
||
|
|
void mbedtls_ecdsa_restart_free( mbedtls_ecdsa_restart_ctx *ctx );
|
||
|
|
#endif /* MBEDTLS_ECP_RESTARTABLE */
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* ecdsa.h */
|