mbedtls/include/polarssl/pk.h
2013-09-12 11:57:00 +02:00

382 lines
11 KiB
C

/**
* \file pk.h
*
* \brief Public Key abstraction layer
*
* Copyright (C) 2006-2013, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef POLARSSL_PK_H
#define POLARSSL_PK_H
#include "config.h"
#include "md.h"
#if defined(POLARSSL_RSA_C)
#include "rsa.h"
#endif
#if defined(POLARSSL_ECP_C)
#include "ecp.h"
#endif
#if defined(POLARSSL_ECDSA_C)
#include "ecdsa.h"
#endif
#define POLARSSL_ERR_PK_MALLOC_FAILED -0x2F80 /**< Memory alloation failed. */
#define POLARSSL_ERR_PK_TYPE_MISMATCH -0x2F00 /**< Type mismatch, eg attempt to encrypt with an ECDSA key */
#define POLARSSL_ERR_PK_BAD_INPUT_DATA -0x2E80 /**< Bad input parameters to function. */
#if defined(POLARSSL_RSA_C)
/**
* Quick access to an RSA context inside a PK context.
*
* \warning You must make sure the PK context actually holds an RSA context
* before using this macro!
*/
#define pk_rsa( pk ) ( (rsa_context *) (pk).pk_ctx )
#endif /* POLARSSL_RSA_C */
#if defined(POLARSSL_ECP_C)
/**
* Quick access to an EC context inside a PK context.
*
* \warning You must make sure the PK context actually holds an EC context
* before using this macro!
*/
#define pk_ec( pk ) ( (ecp_keypair *) (pk).pk_ctx )
#endif /* POLARSSL_ECP_C */
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief Public key types
*/
typedef enum {
POLARSSL_PK_NONE=0,
POLARSSL_PK_RSA,
POLARSSL_PK_ECKEY,
POLARSSL_PK_ECKEY_DH,
POLARSSL_PK_ECDSA,
POLARSSL_PK_RSA_ALT,
} pk_type_t;
/**
* \brief Types for interfacing with the debug module
*/
typedef enum
{
POLARSSL_PK_DEBUG_NONE = 0,
POLARSSL_PK_DEBUG_MPI,
POLARSSL_PK_DEBUG_ECP,
} pk_debug_type;
/**
* \brief Item to send to the debug module
*/
typedef struct
{
pk_debug_type type;
char *name;
void *value;
} pk_debug_item;
/** Maximum number of item send for debugging, plus 1 */
#define POLARSSL_PK_DEBUG_MAX_ITEMS 3
/**
* \brief Public key information and operations
*/
typedef struct
{
/** Public key type */
pk_type_t type;
/** Type name */
const char *name;
/** Get key size in bits */
size_t (*get_size)( const void * );
/** Tell if the context implements this type (eg ECKEY can do ECDSA) */
int (*can_do)( pk_type_t type );
/** Verify signature */
int (*verify_func)( void *ctx, md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len );
/** Make signature */
int (*sign_func)( void *ctx, md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
/** Decrypt message */
int (*decrypt_func)( void *ctx, const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
/** Encrypt message */
int (*encrypt_func)( void *ctx, const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
/** Allocate a new context */
void * (*ctx_alloc_func)( void );
/** Free the given context */
void (*ctx_free_func)( void *ctx );
/** Interface with the debug module */
void (*debug_func)( const void *ctx, pk_debug_item *items );
} pk_info_t;
/**
* \brief Public key container
*/
typedef struct
{
const pk_info_t * pk_info; /**< Public key informations */
void * pk_ctx; /**< Underlying public key context */
} pk_context;
/**
* \brief Types for RSA-alt abstraction
*/
typedef int (*pk_rsa_alt_decrypt_func)( void *ctx, int mode, size_t *olen,
const unsigned char *input, unsigned char *output,
size_t output_max_len );
typedef int (*pk_rsa_alt_sign_func)( void *ctx,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
int mode, int hash_id, unsigned int hashlen,
const unsigned char *hash, unsigned char *sig );
typedef size_t (*pk_rsa_alt_key_len_func)( void *ctx );
/**
* \brief Return information associated with the given PK type
*
* \param type PK type to search for.
*
* \return The PK info associated with the type or NULL if not found.
*/
const pk_info_t *pk_info_from_type( pk_type_t pk_type );
/**
* \brief Initialize a pk_context (as NONE)
*/
void pk_init( pk_context *ctx );
/**
* \brief Free a pk_context
*/
void pk_free( pk_context *ctx );
/**
* \brief Initialize a PK context with the information given
* and allocates the type-specific PK subcontext.
*
* \param ctx Context to initialize. Must be empty (type NONE).
* \param info Information to use
*
* \return 0 on success,
* POLARSSL_ERR_PK_BAD_INPUT_DATA on invalid input,
* POLARSSL_ERR_PK_MALLOC_FAILED on allocation failure.
*
* \note For contexts holding an RSA-alt key, use
* \c pk_init_ctx_rsa_alt() instead.
*/
int pk_init_ctx( pk_context *ctx, const pk_info_t *info );
/**
* \brief Initialiaze an RSA-alt context
*
* \param ctx Context to initialize. Must be empty (type NONE).
* \param key RSA key pointer
* \param decrypt_func Decryption function
* \param sign_func Signing function
* \param key_len_func Function returning key length
*
* \return 0 on success, or POLARSSL_ERR_PK_BAD_INPUT_DATA if the
* context wasn't already initialized as RSA_ALT.
*
* \note This function replaces \c pk_init_ctx() for RSA-alt.
*/
int pk_init_ctx_rsa_alt( pk_context *ctx, void * key,
pk_rsa_alt_decrypt_func decrypt_func,
pk_rsa_alt_sign_func sign_func,
pk_rsa_alt_key_len_func key_len_func );
/**
* \brief Get the size in bits of the underlying key
*
* \param ctx Context to use
*
* \return Key size in bits, or 0 on error
*/
size_t pk_get_size( const pk_context *ctx );
/**
* \brief Get the length in bytes of the underlying key
* \param ctx Context to use
*
* \return Key lenght in bytes, or 0 on error
*/
static inline size_t pk_get_len( const pk_context *ctx )
{
return( ( pk_get_size( ctx ) + 7 ) / 8 );
}
/**
* \brief Tell if a context can do the operation given by type
*
* \param ctx Context to test
* \param type Target type
*
* \return 0 if context can't do the operations,
* 1 otherwise.
*/
int pk_can_do( pk_context *ctx, pk_type_t type );
/**
* \brief Verify signature
*
* \param ctx PK context to use
* \param md_alg Hash algorithm used (see notes)
* \param hash Hash of the message to sign
* \param hash_len Hash length or 0 (see notes)
* \param sig Signature to verify
* \param sig_len Signature length
*
* \return 0 on success (signature is valid),
* or a specific error code.
*
* \note If hash_len is 0, then the length associated with md_alg
* is used instead, or an error returned if it is invalid.
*
* \note md_alg may be POLARSSL_MD_NONE, only if hash_len != 0
*/
int pk_verify( pk_context *ctx, md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len );
/**
* \brief Make signature
*
* \param ctx PK context to use
* \param md_alg Hash algorithm used (see notes)
* \param hash Hash of the message to sign
* \param hash_len Hash length or 0 (see notes)
* \param sig Place to write the signature
* \param sig_len Number of bytes written
* \param f_rng RNG function
* \param p_rng RNG parameter
*
* \return 0 on success, or a specific error code.
*
* \note If hash_len is 0, then the length associated with md_alg
* is used instead, or an error returned if it is invalid.
*
* \note md_alg may be POLARSSL_MD_NONE, only if hash_len != 0
*/
int pk_sign( pk_context *ctx, md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
/**
* \brief Decrypt message
*
* \param ctx PK context to use
* \param input Input to decrypt
* \param ilen Input size
* \param output Decrypted output
* \param olen Decrypted message lenght
* \param osize Size of the output buffer
*
* \return 0 on success, or a specific error code.
*/
int pk_decrypt( pk_context *ctx,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
/**
* \brief Encrypt message
*
* \param ctx PK context to use
* \param input Message to encrypt
* \param ilen Message size
* \param output Encrypted output
* \param olen Encrypted output length
* \param osize Size of the output buffer
*
* \return 0 on success, or a specific error code.
*/
int pk_encrypt( pk_context *ctx,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
/**
* \brief Export debug information
*
* \param ctx Context to use
* \param items Place to write debug items
*
* \return 0 on sucess or POLARSSL_ERR_PK_BAD_INPUT_DATA
*/
int pk_debug( const pk_context *ctx, pk_debug_item *items );
/**
* \brief Access the type name
*
* \param ctx Context to use
*
* \return Type name on success, or "invalid PK"
*/
const char * pk_get_name( const pk_context *ctx );
/**
* \brief Get the key typee
*
* \param ctx Context to use
*
* \return Type on success, or POLARSSL_PK_NONE
*/
pk_type_t pk_get_type( const pk_context *ctx );
#ifdef __cplusplus
}
#endif
#endif /* POLARSSL_PK_H */