library/pk.c - security/mbedtls - Rivoreo Source Code Repositories

 /*
  *  Public Key abstraction layer
  *
  *  Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
  *
  *  This file is part of mbed TLS (https://tls.mbed.org)
  *
  *  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.
  */

 #if !defined(POLARSSL_CONFIG_FILE)
 #include "mbedtls/config.h"
 #else
 #include POLARSSL_CONFIG_FILE
 #endif

 #if defined(POLARSSL_PK_C)
 #include "mbedtls/pk.h"
 #include "mbedtls/pk_wrap.h"

 #if defined(POLARSSL_RSA_C)
 #include "mbedtls/rsa.h"
 #endif
 #if defined(POLARSSL_ECP_C)
 #include "mbedtls/ecp.h"
 #endif
 #if defined(POLARSSL_ECDSA_C)
 #include "mbedtls/ecdsa.h"
 #endif

 /* Implementation that should never be optimized out by the compiler */
 static void polarssl_zeroize( void *v, size_t n ) {
     volatile unsigned char *p = v; while( n-- ) *p++ = 0;
 }

 /*
  * Initialise a pk_context
  */
 void pk_init( pk_context *ctx )
 {
     if( ctx == NULL )
         return;

     ctx->pk_info = NULL;
     ctx->pk_ctx = NULL;
 }

 /*
  * Free (the components of) a pk_context
  */
 void pk_free( pk_context *ctx )
 {
     if( ctx == NULL || ctx->pk_info == NULL )
         return;

     ctx->pk_info->ctx_free_func( ctx->pk_ctx );

     polarssl_zeroize( ctx, sizeof( pk_context ) );
 }

 /*
  * Get pk_info structure from type
  */
 const pk_info_t * pk_info_from_type( pk_type_t pk_type )
 {
     switch( pk_type ) {
 #if defined(POLARSSL_RSA_C)
         case POLARSSL_PK_RSA:
             return( &rsa_info );
 #endif
 #if defined(POLARSSL_ECP_C)
         case POLARSSL_PK_ECKEY:
             return( &eckey_info );
         case POLARSSL_PK_ECKEY_DH:
             return( &eckeydh_info );
 #endif
 #if defined(POLARSSL_ECDSA_C)
         case POLARSSL_PK_ECDSA:
             return( &ecdsa_info );
 #endif
         /* POLARSSL_PK_RSA_ALT omitted on purpose */
         default:
             return( NULL );
     }
 }

 /*
  * Initialise context
  */
 int pk_init_ctx( pk_context *ctx, const pk_info_t *info )
 {
     if( ctx == NULL || info == NULL || ctx->pk_info != NULL )
         return( POLARSSL_ERR_PK_BAD_INPUT_DATA );

     if( ( ctx->pk_ctx = info->ctx_alloc_func() ) == NULL )
         return( POLARSSL_ERR_PK_MALLOC_FAILED );

     ctx->pk_info = info;

     return( 0 );
 }

 /*
  * Initialize an RSA-alt context
  */
 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 )
 {
     rsa_alt_context *rsa_alt;
     const pk_info_t *info = &rsa_alt_info;

     if( ctx == NULL || ctx->pk_info != NULL )
         return( POLARSSL_ERR_PK_BAD_INPUT_DATA );

     if( ( ctx->pk_ctx = info->ctx_alloc_func() ) == NULL )
         return( POLARSSL_ERR_PK_MALLOC_FAILED );

     ctx->pk_info = info;

     rsa_alt = (rsa_alt_context *) ctx->pk_ctx;

     rsa_alt->key = key;
     rsa_alt->decrypt_func = decrypt_func;
     rsa_alt->sign_func = sign_func;
     rsa_alt->key_len_func = key_len_func;

     return( 0 );
 }

 /*
  * Tell if a PK can do the operations of the given type
  */
 int pk_can_do( const pk_context *ctx, pk_type_t type )
 {
     /* null or NONE context can't do anything */
     if( ctx == NULL || ctx->pk_info == NULL )
         return( 0 );

     return( ctx->pk_info->can_do( type ) );
 }

 /*
  * Helper for pk_sign and pk_verify
  */
 static inline int pk_hashlen_helper( md_type_t md_alg, size_t *hash_len )
 {
     const md_info_t *md_info;

     if( *hash_len != 0 )
         return( 0 );

     if( ( md_info = md_info_from_type( md_alg ) ) == NULL )
         return( -1 );

     *hash_len = md_info->size;
     return( 0 );
 }

 /*
  * Verify a signature
  */
 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 )
 {
     if( ctx == NULL || ctx->pk_info == NULL ||
         pk_hashlen_helper( md_alg, &hash_len ) != 0 )
         return( POLARSSL_ERR_PK_BAD_INPUT_DATA );

     if( ctx->pk_info->verify_func == NULL )
         return( POLARSSL_ERR_PK_TYPE_MISMATCH );

     return( ctx->pk_info->verify_func( ctx->pk_ctx, md_alg, hash, hash_len,
                                        sig, sig_len ) );
 }

 /*
  * Verify a signature with options
  */
 int pk_verify_ext( pk_type_t type, const void *options,
                    pk_context *ctx, md_type_t md_alg,
                    const unsigned char *hash, size_t hash_len,
                    const unsigned char *sig, size_t sig_len )
 {
     if( ctx == NULL || ctx->pk_info == NULL )
         return( POLARSSL_ERR_PK_BAD_INPUT_DATA );

     if( ! pk_can_do( ctx, type ) )
         return( POLARSSL_ERR_PK_TYPE_MISMATCH );

     if( type == POLARSSL_PK_RSASSA_PSS )
     {
 #if defined(POLARSSL_RSA_C) && defined(POLARSSL_PKCS1_V21)
         int ret;
         const pk_rsassa_pss_options *pss_opts;

         if( options == NULL )
             return( POLARSSL_ERR_PK_BAD_INPUT_DATA );

         pss_opts = (const pk_rsassa_pss_options *) options;

         if( sig_len < pk_get_len( ctx ) )
             return( POLARSSL_ERR_RSA_VERIFY_FAILED );

         ret = rsa_rsassa_pss_verify_ext( pk_rsa( *ctx ),
                 NULL, NULL, RSA_PUBLIC,
                 md_alg, (unsigned int) hash_len, hash,
                 pss_opts->mgf1_hash_id,
                 pss_opts->expected_salt_len,
                 sig );
         if( ret != 0 )
             return( ret );

         if( sig_len > pk_get_len( ctx ) )
             return( POLARSSL_ERR_PK_SIG_LEN_MISMATCH );

         return( 0 );
 #else
         return( POLARSSL_ERR_PK_FEATURE_UNAVAILABLE );
 #endif
     }

     /* General case: no options */
     if( options != NULL )
         return( POLARSSL_ERR_PK_BAD_INPUT_DATA );

     return( pk_verify( ctx, md_alg, hash, hash_len, sig, sig_len ) );
 }

 /*
  * Make a signature
  */
 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 )
 {
     if( ctx == NULL || ctx->pk_info == NULL ||
         pk_hashlen_helper( md_alg, &hash_len ) != 0 )
         return( POLARSSL_ERR_PK_BAD_INPUT_DATA );

     if( ctx->pk_info->sign_func == NULL )
         return( POLARSSL_ERR_PK_TYPE_MISMATCH );

     return( ctx->pk_info->sign_func( ctx->pk_ctx, md_alg, hash, hash_len,
                                      sig, sig_len, f_rng, p_rng ) );
 }

 /*
  * Decrypt message
  */
 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 )
 {
     if( ctx == NULL || ctx->pk_info == NULL )
         return( POLARSSL_ERR_PK_BAD_INPUT_DATA );

     if( ctx->pk_info->decrypt_func == NULL )
         return( POLARSSL_ERR_PK_TYPE_MISMATCH );

     return( ctx->pk_info->decrypt_func( ctx->pk_ctx, input, ilen,
                 output, olen, osize, f_rng, p_rng ) );
 }

 /*
  * Encrypt message
  */
 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 )
 {
     if( ctx == NULL || ctx->pk_info == NULL )
         return( POLARSSL_ERR_PK_BAD_INPUT_DATA );

     if( ctx->pk_info->encrypt_func == NULL )
         return( POLARSSL_ERR_PK_TYPE_MISMATCH );

     return( ctx->pk_info->encrypt_func( ctx->pk_ctx, input, ilen,
                 output, olen, osize, f_rng, p_rng ) );
 }

 /*
  * Check public-private key pair
  */
 int pk_check_pair( const pk_context *pub, const pk_context *prv )
 {
     if( pub == NULL || pub->pk_info == NULL ||
         prv == NULL || prv->pk_info == NULL ||
         prv->pk_info->check_pair_func == NULL )
     {
         return( POLARSSL_ERR_PK_BAD_INPUT_DATA );
     }

     if( prv->pk_info->type == POLARSSL_PK_RSA_ALT )
     {
         if( pub->pk_info->type != POLARSSL_PK_RSA )
             return( POLARSSL_ERR_PK_TYPE_MISMATCH );
     }
     else
     {
         if( pub->pk_info != prv->pk_info )
             return( POLARSSL_ERR_PK_TYPE_MISMATCH );
     }

     return( prv->pk_info->check_pair_func( pub->pk_ctx, prv->pk_ctx ) );
 }

 /*
  * Get key size in bits
  */
 size_t pk_get_size( const pk_context *ctx )
 {
     if( ctx == NULL || ctx->pk_info == NULL )
         return( 0 );

     return( ctx->pk_info->get_size( ctx->pk_ctx ) );
 }

 /*
  * Export debug information
  */
 int pk_debug( const pk_context *ctx, pk_debug_item *items )
 {
     if( ctx == NULL || ctx->pk_info == NULL )
         return( POLARSSL_ERR_PK_BAD_INPUT_DATA );

     if( ctx->pk_info->debug_func == NULL )
         return( POLARSSL_ERR_PK_TYPE_MISMATCH );

     ctx->pk_info->debug_func( ctx->pk_ctx, items );
     return( 0 );
 }

 /*
  * Access the PK type name
  */
 const char *pk_get_name( const pk_context *ctx )
 {
     if( ctx == NULL || ctx->pk_info == NULL )
         return( "invalid PK" );

     return( ctx->pk_info->name );
 }

 /*
  * Access the PK type
  */
 pk_type_t pk_get_type( const pk_context *ctx )
 {
     if( ctx == NULL || ctx->pk_info == NULL )
         return( POLARSSL_PK_NONE );

     return( ctx->pk_info->type );
 }

 #endif /* POLARSSL_PK_C */
	/*
	* Public Key abstraction layer
	*
	* Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
	*
	* This file is part of mbed TLS (https://tls.mbed.org)
	*
	* 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.
	*/

	#if !defined(POLARSSL_CONFIG_FILE)
	#include "mbedtls/config.h"
	#else
	#include POLARSSL_CONFIG_FILE
	#endif

	#if defined(POLARSSL_PK_C)
	#include "mbedtls/pk.h"
	#include "mbedtls/pk_wrap.h"

	#if defined(POLARSSL_RSA_C)
	#include "mbedtls/rsa.h"
	#endif
	#if defined(POLARSSL_ECP_C)
	#include "mbedtls/ecp.h"
	#endif
	#if defined(POLARSSL_ECDSA_C)
	#include "mbedtls/ecdsa.h"
	#endif

	/* Implementation that should never be optimized out by the compiler */
	static void polarssl_zeroize( void *v, size_t n ) {
	volatile unsigned char p = v; while( n-- ) p++ = 0;
	}

	/*
	* Initialise a pk_context
	*/
	void pk_init( pk_context *ctx )
	{
	if( ctx == NULL )
	return;

	ctx->pk_info = NULL;
	ctx->pk_ctx = NULL;
	}

	/*
	* Free (the components of) a pk_context
	*/
	void pk_free( pk_context *ctx )
	{
	if( ctx == NULL \|\| ctx->pk_info == NULL )
	return;

	ctx->pk_info->ctx_free_func( ctx->pk_ctx );

	polarssl_zeroize( ctx, sizeof( pk_context ) );
	}

	/*
	* Get pk_info structure from type
	*/
	const pk_info_t * pk_info_from_type( pk_type_t pk_type )
	{
	switch( pk_type ) {
	#if defined(POLARSSL_RSA_C)
	case POLARSSL_PK_RSA:
	return( &rsa_info );
	#endif
	#if defined(POLARSSL_ECP_C)
	case POLARSSL_PK_ECKEY:
	return( &eckey_info );
	case POLARSSL_PK_ECKEY_DH:
	return( &eckeydh_info );
	#endif
	#if defined(POLARSSL_ECDSA_C)
	case POLARSSL_PK_ECDSA:
	return( &ecdsa_info );
	#endif
	/* POLARSSL_PK_RSA_ALT omitted on purpose */
	default:
	return( NULL );
	}
	}

	/*
	* Initialise context
	*/
	int pk_init_ctx( pk_context ctx, const pk_info_t info )
	{
	if( ctx == NULL \|\| info == NULL \|\| ctx->pk_info != NULL )
	return( POLARSSL_ERR_PK_BAD_INPUT_DATA );

	if( ( ctx->pk_ctx = info->ctx_alloc_func() ) == NULL )
	return( POLARSSL_ERR_PK_MALLOC_FAILED );

	ctx->pk_info = info;

	return( 0 );
	}

	/*
	* Initialize an RSA-alt context
	*/
	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 )
	{
	rsa_alt_context *rsa_alt;
	const pk_info_t *info = &rsa_alt_info;

	if( ctx == NULL \|\| ctx->pk_info != NULL )
	return( POLARSSL_ERR_PK_BAD_INPUT_DATA );

	if( ( ctx->pk_ctx = info->ctx_alloc_func() ) == NULL )
	return( POLARSSL_ERR_PK_MALLOC_FAILED );

	ctx->pk_info = info;

	rsa_alt = (rsa_alt_context *) ctx->pk_ctx;

	rsa_alt->key = key;
	rsa_alt->decrypt_func = decrypt_func;
	rsa_alt->sign_func = sign_func;
	rsa_alt->key_len_func = key_len_func;

	return( 0 );
	}

	/*
	* Tell if a PK can do the operations of the given type
	*/
	int pk_can_do( const pk_context *ctx, pk_type_t type )
	{
	/* null or NONE context can't do anything */
	if( ctx == NULL \|\| ctx->pk_info == NULL )
	return( 0 );

	return( ctx->pk_info->can_do( type ) );
	}

	/*
	* Helper for pk_sign and pk_verify
	*/
	static inline int pk_hashlen_helper( md_type_t md_alg, size_t *hash_len )
	{
	const md_info_t *md_info;

	if( *hash_len != 0 )
	return( 0 );

	if( ( md_info = md_info_from_type( md_alg ) ) == NULL )
	return( -1 );

	*hash_len = md_info->size;
	return( 0 );
	}

	/*
	* Verify a signature
	*/
	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 )
	{
	if( ctx == NULL \|\| ctx->pk_info == NULL \|\|
	pk_hashlen_helper( md_alg, &hash_len ) != 0 )
	return( POLARSSL_ERR_PK_BAD_INPUT_DATA );

	if( ctx->pk_info->verify_func == NULL )
	return( POLARSSL_ERR_PK_TYPE_MISMATCH );

	return( ctx->pk_info->verify_func( ctx->pk_ctx, md_alg, hash, hash_len,
	sig, sig_len ) );
	}

	/*
	* Verify a signature with options
	*/
	int pk_verify_ext( pk_type_t type, const void *options,
	pk_context *ctx, md_type_t md_alg,
	const unsigned char *hash, size_t hash_len,
	const unsigned char *sig, size_t sig_len )
	{
	if( ctx == NULL \|\| ctx->pk_info == NULL )
	return( POLARSSL_ERR_PK_BAD_INPUT_DATA );

	if( ! pk_can_do( ctx, type ) )
	return( POLARSSL_ERR_PK_TYPE_MISMATCH );

	if( type == POLARSSL_PK_RSASSA_PSS )
	{
	#if defined(POLARSSL_RSA_C) && defined(POLARSSL_PKCS1_V21)
	int ret;
	const pk_rsassa_pss_options *pss_opts;

	if( options == NULL )
	return( POLARSSL_ERR_PK_BAD_INPUT_DATA );

	pss_opts = (const pk_rsassa_pss_options *) options;

	if( sig_len < pk_get_len( ctx ) )
	return( POLARSSL_ERR_RSA_VERIFY_FAILED );

	ret = rsa_rsassa_pss_verify_ext( pk_rsa( *ctx ),
	NULL, NULL, RSA_PUBLIC,
	md_alg, (unsigned int) hash_len, hash,
	pss_opts->mgf1_hash_id,
	pss_opts->expected_salt_len,
	sig );
	if( ret != 0 )
	return( ret );

	if( sig_len > pk_get_len( ctx ) )
	return( POLARSSL_ERR_PK_SIG_LEN_MISMATCH );

	return( 0 );
	#else
	return( POLARSSL_ERR_PK_FEATURE_UNAVAILABLE );
	#endif
	}

	/* General case: no options */
	if( options != NULL )
	return( POLARSSL_ERR_PK_BAD_INPUT_DATA );

	return( pk_verify( ctx, md_alg, hash, hash_len, sig, sig_len ) );
	}

	/*
	* Make a signature
	*/
	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 )
	{
	if( ctx == NULL \|\| ctx->pk_info == NULL \|\|
	pk_hashlen_helper( md_alg, &hash_len ) != 0 )
	return( POLARSSL_ERR_PK_BAD_INPUT_DATA );

	if( ctx->pk_info->sign_func == NULL )
	return( POLARSSL_ERR_PK_TYPE_MISMATCH );

	return( ctx->pk_info->sign_func( ctx->pk_ctx, md_alg, hash, hash_len,
	sig, sig_len, f_rng, p_rng ) );
	}

	/*
	* Decrypt message
	*/
	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 )
	{
	if( ctx == NULL \|\| ctx->pk_info == NULL )
	return( POLARSSL_ERR_PK_BAD_INPUT_DATA );

	if( ctx->pk_info->decrypt_func == NULL )
	return( POLARSSL_ERR_PK_TYPE_MISMATCH );

	return( ctx->pk_info->decrypt_func( ctx->pk_ctx, input, ilen,
	output, olen, osize, f_rng, p_rng ) );
	}

	/*
	* Encrypt message
	*/
	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 )
	{
	if( ctx == NULL \|\| ctx->pk_info == NULL )
	return( POLARSSL_ERR_PK_BAD_INPUT_DATA );

	if( ctx->pk_info->encrypt_func == NULL )
	return( POLARSSL_ERR_PK_TYPE_MISMATCH );

	return( ctx->pk_info->encrypt_func( ctx->pk_ctx, input, ilen,
	output, olen, osize, f_rng, p_rng ) );
	}

	/*
	* Check public-private key pair
	*/
	int pk_check_pair( const pk_context pub, const pk_context prv )
	{
	if( pub == NULL \|\| pub->pk_info == NULL \|\|
	prv == NULL \|\| prv->pk_info == NULL \|\|
	prv->pk_info->check_pair_func == NULL )
	{
	return( POLARSSL_ERR_PK_BAD_INPUT_DATA );
	}

	if( prv->pk_info->type == POLARSSL_PK_RSA_ALT )
	{
	if( pub->pk_info->type != POLARSSL_PK_RSA )
	return( POLARSSL_ERR_PK_TYPE_MISMATCH );
	}
	else
	{
	if( pub->pk_info != prv->pk_info )
	return( POLARSSL_ERR_PK_TYPE_MISMATCH );
	}

	return( prv->pk_info->check_pair_func( pub->pk_ctx, prv->pk_ctx ) );
	}

	/*
	* Get key size in bits
	*/
	size_t pk_get_size( const pk_context *ctx )
	{
	if( ctx == NULL \|\| ctx->pk_info == NULL )
	return( 0 );

	return( ctx->pk_info->get_size( ctx->pk_ctx ) );
	}

	/*
	* Export debug information
	*/
	int pk_debug( const pk_context ctx, pk_debug_item items )
	{
	if( ctx == NULL \|\| ctx->pk_info == NULL )
	return( POLARSSL_ERR_PK_BAD_INPUT_DATA );

	if( ctx->pk_info->debug_func == NULL )
	return( POLARSSL_ERR_PK_TYPE_MISMATCH );

	ctx->pk_info->debug_func( ctx->pk_ctx, items );
	return( 0 );
	}

	/*
	* Access the PK type name
	*/
	const char pk_get_name( const pk_context ctx )
	{
	if( ctx == NULL \|\| ctx->pk_info == NULL )
	return( "invalid PK" );

	return( ctx->pk_info->name );
	}

	/*
	* Access the PK type
	*/
	pk_type_t pk_get_type( const pk_context *ctx )
	{
	if( ctx == NULL \|\| ctx->pk_info == NULL )
	return( POLARSSL_PK_NONE );

	return( ctx->pk_info->type );
	}

	#endif /* POLARSSL_PK_C */