616 lines
21 KiB
C
616 lines
21 KiB
C
/**
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* \file pk.h
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*
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* \brief Public Key abstraction layer
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*
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* Copyright (C) 2006-2015, ARM Limited, 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_PK_H
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#define MBEDTLS_PK_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 "md.h"
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#if defined(MBEDTLS_RSA_C)
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#include "rsa.h"
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#endif
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#if defined(MBEDTLS_ECP_C)
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#include "ecp.h"
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#endif
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#if defined(MBEDTLS_ECDSA_C)
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#include "ecdsa.h"
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#endif
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#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
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!defined(inline) && !defined(__cplusplus)
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#define inline __inline
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#endif
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#define MBEDTLS_ERR_PK_ALLOC_FAILED -0x3F80 /**< Memory allocation failed. */
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#define MBEDTLS_ERR_PK_TYPE_MISMATCH -0x3F00 /**< Type mismatch, eg attempt to encrypt with an ECDSA key */
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#define MBEDTLS_ERR_PK_BAD_INPUT_DATA -0x3E80 /**< Bad input parameters to function. */
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#define MBEDTLS_ERR_PK_FILE_IO_ERROR -0x3E00 /**< Read/write of file failed. */
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#define MBEDTLS_ERR_PK_KEY_INVALID_VERSION -0x3D80 /**< Unsupported key version */
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#define MBEDTLS_ERR_PK_KEY_INVALID_FORMAT -0x3D00 /**< Invalid key tag or value. */
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#define MBEDTLS_ERR_PK_UNKNOWN_PK_ALG -0x3C80 /**< Key algorithm is unsupported (only RSA and EC are supported). */
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#define MBEDTLS_ERR_PK_PASSWORD_REQUIRED -0x3C00 /**< Private key password can't be empty. */
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#define MBEDTLS_ERR_PK_PASSWORD_MISMATCH -0x3B80 /**< Given private key password does not allow for correct decryption. */
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#define MBEDTLS_ERR_PK_INVALID_PUBKEY -0x3B00 /**< The pubkey tag or value is invalid (only RSA and EC are supported). */
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#define MBEDTLS_ERR_PK_INVALID_ALG -0x3A80 /**< The algorithm tag or value is invalid. */
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#define MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE -0x3A00 /**< Elliptic curve is unsupported (only NIST curves are supported). */
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#define MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE -0x3980 /**< Unavailable feature, e.g. RSA disabled for RSA key. */
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#define MBEDTLS_ERR_PK_SIG_LEN_MISMATCH -0x3900 /**< The signature is valid but its length is less than expected. */
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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 Public key types
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*/
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typedef enum {
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MBEDTLS_PK_NONE=0,
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MBEDTLS_PK_RSA,
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MBEDTLS_PK_ECKEY,
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MBEDTLS_PK_ECKEY_DH,
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MBEDTLS_PK_ECDSA,
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MBEDTLS_PK_RSA_ALT,
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MBEDTLS_PK_RSASSA_PSS,
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} mbedtls_pk_type_t;
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/**
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* \brief Options for RSASSA-PSS signature verification.
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* See \c mbedtls_rsa_rsassa_pss_verify_ext()
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*/
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typedef struct
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{
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mbedtls_md_type_t mgf1_hash_id;
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int expected_salt_len;
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} mbedtls_pk_rsassa_pss_options;
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/**
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* \brief Types for interfacing with the debug module
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*/
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typedef enum
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{
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MBEDTLS_PK_DEBUG_NONE = 0,
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MBEDTLS_PK_DEBUG_MPI,
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MBEDTLS_PK_DEBUG_ECP,
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} mbedtls_pk_debug_type;
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/**
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* \brief Item to send to the debug module
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*/
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typedef struct
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{
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mbedtls_pk_debug_type type;
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const char *name;
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void *value;
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} mbedtls_pk_debug_item;
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/** Maximum number of item send for debugging, plus 1 */
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#define MBEDTLS_PK_DEBUG_MAX_ITEMS 3
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/**
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* \brief Public key information and operations
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*/
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typedef struct mbedtls_pk_info_t mbedtls_pk_info_t;
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/**
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* \brief Public key container
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*/
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typedef struct
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{
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const mbedtls_pk_info_t * pk_info; /**< Public key informations */
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void * pk_ctx; /**< Underlying public key context */
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} mbedtls_pk_context;
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#if defined(MBEDTLS_RSA_C)
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/**
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* Quick access to an RSA context inside a PK context.
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*
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* \warning You must make sure the PK context actually holds an RSA context
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* before using this function!
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*/
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static inline mbedtls_rsa_context *mbedtls_pk_rsa( const mbedtls_pk_context pk )
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{
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return( (mbedtls_rsa_context *) (pk).pk_ctx );
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}
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#endif /* MBEDTLS_RSA_C */
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#if defined(MBEDTLS_ECP_C)
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/**
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* Quick access to an EC context inside a PK context.
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*
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* \warning You must make sure the PK context actually holds an EC context
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* before using this function!
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*/
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static inline mbedtls_ecp_keypair *mbedtls_pk_ec( const mbedtls_pk_context pk )
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{
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return( (mbedtls_ecp_keypair *) (pk).pk_ctx );
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}
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#endif /* MBEDTLS_ECP_C */
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#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
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/**
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* \brief Types for RSA-alt abstraction
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*/
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typedef int (*mbedtls_pk_rsa_alt_decrypt_func)( void *ctx, int mode, size_t *olen,
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const unsigned char *input, unsigned char *output,
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size_t output_max_len );
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typedef int (*mbedtls_pk_rsa_alt_sign_func)( void *ctx,
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int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
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int mode, mbedtls_md_type_t md_alg, unsigned int hashlen,
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const unsigned char *hash, unsigned char *sig );
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typedef size_t (*mbedtls_pk_rsa_alt_key_len_func)( void *ctx );
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#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
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/**
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* \brief Return information associated with the given PK type
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*
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* \param pk_type PK type to search for.
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*
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* \return The PK info associated with the type or NULL if not found.
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*/
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const mbedtls_pk_info_t *mbedtls_pk_info_from_type( mbedtls_pk_type_t pk_type );
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/**
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* \brief Initialize a mbedtls_pk_context (as NONE)
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*/
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void mbedtls_pk_init( mbedtls_pk_context *ctx );
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/**
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* \brief Free a mbedtls_pk_context
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*/
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void mbedtls_pk_free( mbedtls_pk_context *ctx );
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/**
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* \brief Initialize a PK context with the information given
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* and allocates the type-specific PK subcontext.
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*
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* \param ctx Context to initialize. Must be empty (type NONE).
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* \param info Information to use
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*
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* \return 0 on success,
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* MBEDTLS_ERR_PK_BAD_INPUT_DATA on invalid input,
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* MBEDTLS_ERR_PK_ALLOC_FAILED on allocation failure.
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*
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* \note For contexts holding an RSA-alt key, use
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* \c mbedtls_pk_setup_rsa_alt() instead.
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*/
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int mbedtls_pk_setup( mbedtls_pk_context *ctx, const mbedtls_pk_info_t *info );
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#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
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/**
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* \brief Initialize an RSA-alt context
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*
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* \param ctx Context to initialize. Must be empty (type NONE).
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* \param key RSA key pointer
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* \param decrypt_func Decryption function
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* \param sign_func Signing function
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* \param key_len_func Function returning key length in bytes
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*
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* \return 0 on success, or MBEDTLS_ERR_PK_BAD_INPUT_DATA if the
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* context wasn't already initialized as RSA_ALT.
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*
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* \note This function replaces \c mbedtls_pk_setup() for RSA-alt.
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*/
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int mbedtls_pk_setup_rsa_alt( mbedtls_pk_context *ctx, void * key,
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mbedtls_pk_rsa_alt_decrypt_func decrypt_func,
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mbedtls_pk_rsa_alt_sign_func sign_func,
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mbedtls_pk_rsa_alt_key_len_func key_len_func );
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#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
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/**
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* \brief Get the size in bits of the underlying key
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*
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* \param ctx Context to use
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*
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* \return Key size in bits, or 0 on error
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*/
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size_t mbedtls_pk_get_bitlen( const mbedtls_pk_context *ctx );
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/**
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* \brief Get the length in bytes of the underlying key
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* \param ctx Context to use
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*
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* \return Key length in bytes, or 0 on error
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*/
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static inline size_t mbedtls_pk_get_len( const mbedtls_pk_context *ctx )
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{
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return( ( mbedtls_pk_get_bitlen( ctx ) + 7 ) / 8 );
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}
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/**
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* \brief Tell if a context can do the operation given by type
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*
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* \param ctx Context to test
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* \param type Target type
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*
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* \return 0 if context can't do the operations,
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* 1 otherwise.
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*/
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int mbedtls_pk_can_do( const mbedtls_pk_context *ctx, mbedtls_pk_type_t type );
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/**
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* \brief Verify signature (including padding if relevant).
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*
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* \param ctx PK context to use
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* \param md_alg Hash algorithm used (see notes)
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* \param hash Hash of the message to sign
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* \param hash_len Hash length or 0 (see notes)
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* \param sig Signature to verify
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* \param sig_len Signature length
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*
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* \return 0 on success (signature is valid),
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* MBEDTLS_ERR_PK_SIG_LEN_MISMATCH if the signature is
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* valid but its actual length is less than sig_len,
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* or a specific error code.
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*
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* \note For RSA keys, the default padding type is PKCS#1 v1.5.
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* Use \c mbedtls_pk_verify_ext( MBEDTLS_PK_RSASSA_PSS, ... )
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* to verify RSASSA_PSS signatures.
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*
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* \note If hash_len is 0, then the length associated with md_alg
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* is used instead, or an error returned if it is invalid.
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*
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* \note md_alg may be MBEDTLS_MD_NONE, only if hash_len != 0
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*/
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int mbedtls_pk_verify( mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
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const unsigned char *hash, size_t hash_len,
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const unsigned char *sig, size_t sig_len );
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/**
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* \brief Verify signature, with options.
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* (Includes verification of the padding depending on type.)
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*
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* \param type Signature type (inc. possible padding type) to verify
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* \param options Pointer to type-specific options, or NULL
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* \param ctx PK context to use
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* \param md_alg Hash algorithm used (see notes)
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* \param hash Hash of the message to sign
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* \param hash_len Hash length or 0 (see notes)
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* \param sig Signature to verify
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* \param sig_len Signature length
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*
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* \return 0 on success (signature is valid),
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* MBEDTLS_ERR_PK_TYPE_MISMATCH if the PK context can't be
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* used for this type of signatures,
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* MBEDTLS_ERR_PK_SIG_LEN_MISMATCH if the signature is
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* valid but its actual length is less than sig_len,
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* or a specific error code.
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*
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* \note If hash_len is 0, then the length associated with md_alg
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* is used instead, or an error returned if it is invalid.
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*
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* \note md_alg may be MBEDTLS_MD_NONE, only if hash_len != 0
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*
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* \note If type is MBEDTLS_PK_RSASSA_PSS, then options must point
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* to a mbedtls_pk_rsassa_pss_options structure,
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* otherwise it must be NULL.
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*/
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int mbedtls_pk_verify_ext( mbedtls_pk_type_t type, const void *options,
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mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
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const unsigned char *hash, size_t hash_len,
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const unsigned char *sig, size_t sig_len );
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/**
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* \brief Make signature, including padding if relevant.
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*
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* \param ctx PK context to use - must hold a private key
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* \param md_alg Hash algorithm used (see notes)
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* \param hash Hash of the message to sign
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* \param hash_len Hash length or 0 (see notes)
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* \param sig Place to write the signature
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* \param sig_len Number of bytes written
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* \param f_rng RNG function
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* \param p_rng RNG parameter
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*
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* \return 0 on success, or a specific error code.
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*
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* \note For RSA keys, the default padding type is PKCS#1 v1.5.
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* There is no interface in the PK module to make RSASSA-PSS
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* signatures yet.
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*
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* \note If hash_len is 0, then the length associated with md_alg
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* is used instead, or an error returned if it is invalid.
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*
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* \note For RSA, md_alg may be MBEDTLS_MD_NONE if hash_len != 0.
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* For ECDSA, md_alg may never be MBEDTLS_MD_NONE.
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*/
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int mbedtls_pk_sign( mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
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const unsigned char *hash, size_t hash_len,
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unsigned char *sig, size_t *sig_len,
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int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
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/**
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* \brief Decrypt message (including padding if relevant).
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*
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* \param ctx PK context to use - must hold a private key
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* \param input Input to decrypt
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* \param ilen Input size
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* \param output Decrypted output
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* \param olen Decrypted message length
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* \param osize Size of the output buffer
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* \param f_rng RNG function
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* \param p_rng RNG parameter
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*
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* \note For RSA keys, the default padding type is PKCS#1 v1.5.
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*
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* \return 0 on success, or a specific error code.
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*/
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int mbedtls_pk_decrypt( mbedtls_pk_context *ctx,
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const unsigned char *input, size_t ilen,
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unsigned char *output, size_t *olen, size_t osize,
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int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
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/**
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* \brief Encrypt message (including padding if relevant).
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*
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* \param ctx PK context to use
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* \param input Message to encrypt
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* \param ilen Message size
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* \param output Encrypted output
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* \param olen Encrypted output length
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* \param osize Size of the output buffer
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* \param f_rng RNG function
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* \param p_rng RNG parameter
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*
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* \note For RSA keys, the default padding type is PKCS#1 v1.5.
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*
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* \return 0 on success, or a specific error code.
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*/
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int mbedtls_pk_encrypt( mbedtls_pk_context *ctx,
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const unsigned char *input, size_t ilen,
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unsigned char *output, size_t *olen, size_t osize,
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int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
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/**
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* \brief Check if a public-private pair of keys matches.
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*
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* \param pub Context holding a public key.
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* \param prv Context holding a private (and public) key.
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*
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* \return 0 on success or MBEDTLS_ERR_PK_BAD_INPUT_DATA
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*/
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int mbedtls_pk_check_pair( const mbedtls_pk_context *pub, const mbedtls_pk_context *prv );
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/**
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* \brief Export debug information
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*
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* \param ctx Context to use
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* \param items Place to write debug items
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*
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* \return 0 on success or MBEDTLS_ERR_PK_BAD_INPUT_DATA
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*/
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int mbedtls_pk_debug( const mbedtls_pk_context *ctx, mbedtls_pk_debug_item *items );
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/**
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* \brief Access the type name
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*
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* \param ctx Context to use
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*
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* \return Type name on success, or "invalid PK"
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*/
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const char * mbedtls_pk_get_name( const mbedtls_pk_context *ctx );
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/**
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* \brief Get the key type
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*
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* \param ctx Context to use
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*
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* \return Type on success, or MBEDTLS_PK_NONE
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*/
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mbedtls_pk_type_t mbedtls_pk_get_type( const mbedtls_pk_context *ctx );
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#if defined(MBEDTLS_PK_PARSE_C)
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/** \ingroup pk_module */
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/**
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* \brief Parse a private key in PEM or DER format
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*
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* \param ctx key to be initialized
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* \param key input buffer
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* \param keylen size of the buffer
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* (including the terminating null byte for PEM data)
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* \param pwd password for decryption (optional)
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* \param pwdlen size of the password
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*
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* \note On entry, ctx must be empty, either freshly initialised
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* with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a
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* specific key type, check the result with mbedtls_pk_can_do().
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*
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* \note The key is also checked for correctness.
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*
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* \return 0 if successful, or a specific PK or PEM error code
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*/
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int mbedtls_pk_parse_key( mbedtls_pk_context *ctx,
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const unsigned char *key, size_t keylen,
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const unsigned char *pwd, size_t pwdlen );
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/** \ingroup pk_module */
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/**
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* \brief Parse a public key in PEM or DER format
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*
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* \param ctx key to be initialized
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* \param key input buffer
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* \param keylen size of the buffer
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* (including the terminating null byte for PEM data)
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*
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* \note On entry, ctx must be empty, either freshly initialised
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* with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a
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* specific key type, check the result with mbedtls_pk_can_do().
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*
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* \note The key is also checked for correctness.
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*
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* \return 0 if successful, or a specific PK or PEM error code
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*/
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int mbedtls_pk_parse_public_key( mbedtls_pk_context *ctx,
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const unsigned char *key, size_t keylen );
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#if defined(MBEDTLS_FS_IO)
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/** \ingroup pk_module */
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/**
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* \brief Load and parse a private key
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*
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* \param ctx key to be initialized
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* \param path filename to read the private key from
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* \param password password to decrypt the file (can be NULL)
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*
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* \note On entry, ctx must be empty, either freshly initialised
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* with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a
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* specific key type, check the result with mbedtls_pk_can_do().
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*
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* \note The key is also checked for correctness.
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*
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* \return 0 if successful, or a specific PK or PEM error code
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*/
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int mbedtls_pk_parse_keyfile( mbedtls_pk_context *ctx,
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const char *path, const char *password );
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/** \ingroup pk_module */
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/**
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* \brief Load and parse a public key
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*
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* \param ctx key to be initialized
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* \param path filename to read the public key from
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*
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* \note On entry, ctx must be empty, either freshly initialised
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* with mbedtls_pk_init() or reset with mbedtls_pk_free(). If
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* you need a specific key type, check the result with
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* mbedtls_pk_can_do().
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*
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* \note The key is also checked for correctness.
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*
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* \return 0 if successful, or a specific PK or PEM error code
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*/
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int mbedtls_pk_parse_public_keyfile( mbedtls_pk_context *ctx, const char *path );
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#endif /* MBEDTLS_FS_IO */
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#endif /* MBEDTLS_PK_PARSE_C */
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#if defined(MBEDTLS_PK_WRITE_C)
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/**
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* \brief Write a private key to a PKCS#1 or SEC1 DER structure
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* Note: data is written at the end of the buffer! Use the
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* return value to determine where you should start
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* using the buffer
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*
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* \param ctx private to write away
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* \param buf buffer to write to
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* \param size size of the buffer
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*
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* \return length of data written if successful, or a specific
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* error code
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*/
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int mbedtls_pk_write_key_der( mbedtls_pk_context *ctx, unsigned char *buf, size_t size );
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/**
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* \brief Write a public key to a SubjectPublicKeyInfo DER structure
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* Note: data is written at the end of the buffer! Use the
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* return value to determine where you should start
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* using the buffer
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*
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* \param ctx public key to write away
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* \param buf buffer to write to
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* \param size size of the buffer
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*
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* \return length of data written if successful, or a specific
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* error code
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*/
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int mbedtls_pk_write_pubkey_der( mbedtls_pk_context *ctx, unsigned char *buf, size_t size );
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#if defined(MBEDTLS_PEM_WRITE_C)
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/**
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* \brief Write a public key to a PEM string
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*
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* \param ctx public key to write away
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* \param buf buffer to write to
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* \param size size of the buffer
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*
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* \return 0 if successful, or a specific error code
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*/
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int mbedtls_pk_write_pubkey_pem( mbedtls_pk_context *ctx, unsigned char *buf, size_t size );
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/**
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* \brief Write a private key to a PKCS#1 or SEC1 PEM string
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*
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* \param ctx private to write away
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* \param buf buffer to write to
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* \param size size of the buffer
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*
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* \return 0 if successful, or a specific error code
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*/
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int mbedtls_pk_write_key_pem( mbedtls_pk_context *ctx, unsigned char *buf, size_t size );
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#endif /* MBEDTLS_PEM_WRITE_C */
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#endif /* MBEDTLS_PK_WRITE_C */
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/*
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* WARNING: Low-level functions. You probably do not want to use these unless
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* you are certain you do ;)
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*/
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#if defined(MBEDTLS_PK_PARSE_C)
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/**
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* \brief Parse a SubjectPublicKeyInfo DER structure
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*
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* \param p the position in the ASN.1 data
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* \param end end of the buffer
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* \param pk the key to fill
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*
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* \return 0 if successful, or a specific PK error code
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*/
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int mbedtls_pk_parse_subpubkey( unsigned char **p, const unsigned char *end,
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mbedtls_pk_context *pk );
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#endif /* MBEDTLS_PK_PARSE_C */
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#if defined(MBEDTLS_PK_WRITE_C)
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/**
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* \brief Write a subjectPublicKey to ASN.1 data
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* Note: function works backwards in data buffer
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*
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* \param p reference to current position pointer
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* \param start start of the buffer (for bounds-checking)
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* \param key public key to write away
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*
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* \return the length written or a negative error code
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*/
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int mbedtls_pk_write_pubkey( unsigned char **p, unsigned char *start,
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const mbedtls_pk_context *key );
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#endif /* MBEDTLS_PK_WRITE_C */
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/*
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* Internal module functions. You probably do not want to use these unless you
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* know you do.
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*/
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#if defined(MBEDTLS_FS_IO)
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int mbedtls_pk_load_file( const char *path, unsigned char **buf, size_t *n );
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* MBEDTLS_PK_H */
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