9013af76a3
This refactoring adds support for proper CSR writing and X509 certificate generation / signing
385 lines
11 KiB
C
385 lines
11 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) 2006-2013, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef POLARSSL_PK_H
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#define POLARSSL_PK_H
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#include "config.h"
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#include "md.h"
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#if defined(POLARSSL_RSA_C)
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#include "rsa.h"
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#endif
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#if defined(POLARSSL_ECP_C)
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#include "ecp.h"
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#endif
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#if defined(POLARSSL_ECDSA_C)
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#include "ecdsa.h"
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#endif
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#define POLARSSL_ERR_PK_MALLOC_FAILED -0x2F80 /**< Memory alloation failed. */
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#define POLARSSL_ERR_PK_TYPE_MISMATCH -0x2F00 /**< Type mismatch, eg attempt to encrypt with an ECDSA key */
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#define POLARSSL_ERR_PK_BAD_INPUT_DATA -0x2E80 /**< Bad input parameters to function. */
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#if defined(POLARSSL_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 macro!
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*/
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#define pk_rsa( pk ) ( (rsa_context *) (pk).pk_ctx )
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#endif /* POLARSSL_RSA_C */
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#if defined(POLARSSL_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 macro!
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*/
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#define pk_ec( pk ) ( (ecp_keypair *) (pk).pk_ctx )
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#endif /* POLARSSL_ECP_C */
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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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POLARSSL_PK_NONE=0,
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POLARSSL_PK_RSA,
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POLARSSL_PK_ECKEY,
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POLARSSL_PK_ECKEY_DH,
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POLARSSL_PK_ECDSA,
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POLARSSL_PK_RSA_ALT,
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} pk_type_t;
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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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POLARSSL_PK_DEBUG_NONE = 0,
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POLARSSL_PK_DEBUG_MPI,
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POLARSSL_PK_DEBUG_ECP,
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} 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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pk_debug_type type;
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char *name;
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void *value;
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} pk_debug_item;
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/** Maximum number of item send for debugging, plus 1 */
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#define POLARSSL_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
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{
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/** Public key type */
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pk_type_t type;
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/** Type name */
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const char *name;
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/** Get key size in bits */
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size_t (*get_size)( const void * );
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/** Tell if the context implements this type (eg ECKEY can do ECDSA) */
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int (*can_do)( pk_type_t type );
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/** Verify signature */
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int (*verify_func)( void *ctx, 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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/** Make signature */
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int (*sign_func)( void *ctx, 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),
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void *p_rng );
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/** Decrypt message */
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int (*decrypt_func)( void *ctx, 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),
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void *p_rng );
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/** Encrypt message */
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int (*encrypt_func)( void *ctx, 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),
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void *p_rng );
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/** Allocate a new context */
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void * (*ctx_alloc_func)( void );
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/** Free the given context */
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void (*ctx_free_func)( void *ctx );
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/** Interface with the debug module */
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void (*debug_func)( const void *ctx, pk_debug_item *items );
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} 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 pk_info_t * pk_info; /**< Public key informations */
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void * pk_ctx; /**< Underlying public key context */
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} pk_context;
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/**
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* \brief Types for RSA-alt abstraction
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*/
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typedef int (*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 (*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, int hash_id, unsigned int hashlen,
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const unsigned char *hash, unsigned char *sig );
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typedef size_t (*pk_rsa_alt_key_len_func)( void *ctx );
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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 pk_info_t *pk_info_from_type( pk_type_t pk_type );
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/**
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* \brief Initialize a pk_context (as NONE)
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*/
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void pk_init( pk_context *ctx );
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/**
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* \brief Free a pk_context
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*/
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void pk_free( 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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* POLARSSL_ERR_PK_BAD_INPUT_DATA on invalid input,
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* POLARSSL_ERR_PK_MALLOC_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 pk_init_ctx_rsa_alt() instead.
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*/
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int pk_init_ctx( pk_context *ctx, const pk_info_t *info );
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/**
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* \brief Initialiaze 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
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*
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* \return 0 on success, or POLARSSL_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 pk_init_ctx() for RSA-alt.
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*/
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int pk_init_ctx_rsa_alt( pk_context *ctx, void * key,
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pk_rsa_alt_decrypt_func decrypt_func,
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pk_rsa_alt_sign_func sign_func,
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pk_rsa_alt_key_len_func key_len_func );
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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 pk_get_size( const 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 lenght in bytes, or 0 on error
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*/
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static inline size_t pk_get_len( const pk_context *ctx )
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{
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return( ( pk_get_size( 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 pk_can_do( pk_context *ctx, pk_type_t type );
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/**
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* \brief Verify signature
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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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* 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 POLARSSL_MD_NONE, only if hash_len != 0
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*/
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int pk_verify( pk_context *ctx, 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
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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 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 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 POLARSSL_MD_NONE, only if hash_len != 0
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*/
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int pk_sign( pk_context *ctx, 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
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*
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* \param ctx PK context to use
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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 lenght
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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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* \return 0 on success, or a specific error code.
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*/
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int pk_decrypt( 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
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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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* \return 0 on success, or a specific error code.
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*/
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int pk_encrypt( 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 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 sucess or POLARSSL_ERR_PK_BAD_INPUT_DATA
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*/
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int pk_debug( const pk_context *ctx, 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 * pk_get_name( const pk_context *ctx );
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/**
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* \brief Get the key typee
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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 POLARSSL_PK_NONE
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*/
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pk_type_t pk_get_type( const pk_context *ctx );
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#ifdef __cplusplus
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}
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#endif
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#endif /* POLARSSL_PK_H */
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