library/pk_wrap.c - third_party/github/ARMmbed/mbedtls - Git at Google

 /*
  *  Public Key abstraction layer: wrapper functions
  *
  *  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(MBEDTLS_CONFIG_FILE)
 #include "mbedtls/config.h"
 #else
 #include MBEDTLS_CONFIG_FILE
 #endif

 #if defined(MBEDTLS_PK_C)
 #include "mbedtls/pk_internal.h"

 /* Even if RSA not activated, for the sake of RSA-alt */
 #include "mbedtls/rsa.h"

 #include <string.h>

 #if defined(MBEDTLS_ECP_C)
 #include "mbedtls/ecp.h"
 #endif

 #if defined(MBEDTLS_ECDSA_C)
 #include "mbedtls/ecdsa.h"
 #endif

 #if defined(MBEDTLS_PLATFORM_C)
 #include "mbedtls/platform.h"
 #else
 #include <stdlib.h>
 #define mbedtls_calloc    calloc
 #define mbedtls_free       free
 #endif

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

 #if defined(MBEDTLS_RSA_C)
 static int rsa_can_do( mbedtls_pk_type_t type )
 {
     return( type == MBEDTLS_PK_RSA ||
             type == MBEDTLS_PK_RSASSA_PSS );
 }

 static size_t rsa_get_size( const void *ctx )
 {
     return( 8 * ((const mbedtls_rsa_context *) ctx)->len );
 }

 static int rsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
                    const unsigned char *hash, size_t hash_len,
                    const unsigned char *sig, size_t sig_len )
 {
     int ret;

     if( sig_len < ((mbedtls_rsa_context *) ctx)->len )
         return( MBEDTLS_ERR_RSA_VERIFY_FAILED );

     if( ( ret = mbedtls_rsa_pkcs1_verify( (mbedtls_rsa_context *) ctx, NULL, NULL,
                                   MBEDTLS_RSA_PUBLIC, md_alg,
                                   (unsigned int) hash_len, hash, sig ) ) != 0 )
         return( ret );

     if( sig_len > ((mbedtls_rsa_context *) ctx)->len )
         return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );

     return( 0 );
 }

 static int rsa_sign_wrap( void *ctx, mbedtls_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 )
 {
     *sig_len = ((mbedtls_rsa_context *) ctx)->len;

     return( mbedtls_rsa_pkcs1_sign( (mbedtls_rsa_context *) ctx, f_rng, p_rng, MBEDTLS_RSA_PRIVATE,
                 md_alg, (unsigned int) hash_len, hash, sig ) );
 }

 static int rsa_decrypt_wrap( 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 )
 {
     if( ilen != ((mbedtls_rsa_context *) ctx)->len )
         return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );

     return( mbedtls_rsa_pkcs1_decrypt( (mbedtls_rsa_context *) ctx, f_rng, p_rng,
                 MBEDTLS_RSA_PRIVATE, olen, input, output, osize ) );
 }

 static int rsa_encrypt_wrap( 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 )
 {
     *olen = ((mbedtls_rsa_context *) ctx)->len;

     if( *olen > osize )
         return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE );

     return( mbedtls_rsa_pkcs1_encrypt( (mbedtls_rsa_context *) ctx,
                 f_rng, p_rng, MBEDTLS_RSA_PUBLIC, ilen, input, output ) );
 }

 static int rsa_check_pair_wrap( const void *pub, const void *prv )
 {
     return( mbedtls_rsa_check_pub_priv( (const mbedtls_rsa_context *) pub,
                                 (const mbedtls_rsa_context *) prv ) );
 }

 static void *rsa_alloc_wrap( void )
 {
     void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_rsa_context ) );

     if( ctx != NULL )
         mbedtls_rsa_init( (mbedtls_rsa_context *) ctx, 0, 0 );

     return( ctx );
 }

 static void rsa_free_wrap( void *ctx )
 {
     mbedtls_rsa_free( (mbedtls_rsa_context *) ctx );
     mbedtls_free( ctx );
 }

 static void rsa_debug( const void *ctx, mbedtls_pk_debug_item *items )
 {
     items->type = MBEDTLS_PK_DEBUG_MPI;
     items->name = "rsa.N";
     items->value = &( ((mbedtls_rsa_context *) ctx)->N );

     items++;

     items->type = MBEDTLS_PK_DEBUG_MPI;
     items->name = "rsa.E";
     items->value = &( ((mbedtls_rsa_context *) ctx)->E );
 }

 const mbedtls_pk_info_t mbedtls_rsa_info = {
     MBEDTLS_PK_RSA,
     "RSA",
     rsa_get_size,
     rsa_can_do,
     rsa_verify_wrap,
     rsa_sign_wrap,
     rsa_decrypt_wrap,
     rsa_encrypt_wrap,
     rsa_check_pair_wrap,
     rsa_alloc_wrap,
     rsa_free_wrap,
     rsa_debug,
 };
 #endif /* MBEDTLS_RSA_C */

 #if defined(MBEDTLS_ECP_C)
 /*
  * Generic EC key
  */
 static int eckey_can_do( mbedtls_pk_type_t type )
 {
     return( type == MBEDTLS_PK_ECKEY ||
             type == MBEDTLS_PK_ECKEY_DH ||
             type == MBEDTLS_PK_ECDSA );
 }

 static size_t eckey_get_size( const void *ctx )
 {
     return( ((mbedtls_ecp_keypair *) ctx)->grp.pbits );
 }

 #if defined(MBEDTLS_ECDSA_C)
 /* Forward declarations */
 static int ecdsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
                        const unsigned char *hash, size_t hash_len,
                        const unsigned char *sig, size_t sig_len );

 static int ecdsa_sign_wrap( void *ctx, mbedtls_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 );

 static int eckey_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
                        const unsigned char *hash, size_t hash_len,
                        const unsigned char *sig, size_t sig_len )
 {
     int ret;
     mbedtls_ecdsa_context ecdsa;

     mbedtls_ecdsa_init( &ecdsa );

     if( ( ret = mbedtls_ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )
         ret = ecdsa_verify_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len );

     mbedtls_ecdsa_free( &ecdsa );

     return( ret );
 }

 static int eckey_sign_wrap( void *ctx, mbedtls_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 )
 {
     int ret;
     mbedtls_ecdsa_context ecdsa;

     mbedtls_ecdsa_init( &ecdsa );

     if( ( ret = mbedtls_ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )
         ret = ecdsa_sign_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len,
                                f_rng, p_rng );

     mbedtls_ecdsa_free( &ecdsa );

     return( ret );
 }

 #endif /* MBEDTLS_ECDSA_C */

 static int eckey_check_pair( const void *pub, const void *prv )
 {
     return( mbedtls_ecp_check_pub_priv( (const mbedtls_ecp_keypair *) pub,
                                 (const mbedtls_ecp_keypair *) prv ) );
 }

 static void *eckey_alloc_wrap( void )
 {
     void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecp_keypair ) );

     if( ctx != NULL )
         mbedtls_ecp_keypair_init( ctx );

     return( ctx );
 }

 static void eckey_free_wrap( void *ctx )
 {
     mbedtls_ecp_keypair_free( (mbedtls_ecp_keypair *) ctx );
     mbedtls_free( ctx );
 }

 static void eckey_debug( const void *ctx, mbedtls_pk_debug_item *items )
 {
     items->type = MBEDTLS_PK_DEBUG_ECP;
     items->name = "eckey.Q";
     items->value = &( ((mbedtls_ecp_keypair *) ctx)->Q );
 }

 const mbedtls_pk_info_t mbedtls_eckey_info = {
     MBEDTLS_PK_ECKEY,
     "EC",
     eckey_get_size,
     eckey_can_do,
 #if defined(MBEDTLS_ECDSA_C)
     eckey_verify_wrap,
     eckey_sign_wrap,
 #else
     NULL,
     NULL,
 #endif
     NULL,
     NULL,
     eckey_check_pair,
     eckey_alloc_wrap,
     eckey_free_wrap,
     eckey_debug,
 };

 /*
  * EC key restricted to ECDH
  */
 static int eckeydh_can_do( mbedtls_pk_type_t type )
 {
     return( type == MBEDTLS_PK_ECKEY ||
             type == MBEDTLS_PK_ECKEY_DH );
 }

 const mbedtls_pk_info_t mbedtls_eckeydh_info = {
     MBEDTLS_PK_ECKEY_DH,
     "EC_DH",
     eckey_get_size,         /* Same underlying key structure */
     eckeydh_can_do,
     NULL,
     NULL,
     NULL,
     NULL,
     eckey_check_pair,
     eckey_alloc_wrap,       /* Same underlying key structure */
     eckey_free_wrap,        /* Same underlying key structure */
     eckey_debug,            /* Same underlying key structure */
 };
 #endif /* MBEDTLS_ECP_C */

 #if defined(MBEDTLS_ECDSA_C)
 static int ecdsa_can_do( mbedtls_pk_type_t type )
 {
     return( type == MBEDTLS_PK_ECDSA );
 }

 static int ecdsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
                        const unsigned char *hash, size_t hash_len,
                        const unsigned char *sig, size_t sig_len )
 {
     int ret;
     ((void) md_alg);

     ret = mbedtls_ecdsa_read_signature( (mbedtls_ecdsa_context *) ctx,
                                 hash, hash_len, sig, sig_len );

     if( ret == MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH )
         return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );

     return( ret );
 }

 static int ecdsa_sign_wrap( void *ctx, mbedtls_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 )
 {
     return( mbedtls_ecdsa_write_signature( (mbedtls_ecdsa_context *) ctx,
                 md_alg, hash, hash_len, sig, sig_len, f_rng, p_rng ) );
 }

 static void *ecdsa_alloc_wrap( void )
 {
     void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecdsa_context ) );

     if( ctx != NULL )
         mbedtls_ecdsa_init( (mbedtls_ecdsa_context *) ctx );

     return( ctx );
 }

 static void ecdsa_free_wrap( void *ctx )
 {
     mbedtls_ecdsa_free( (mbedtls_ecdsa_context *) ctx );
     mbedtls_free( ctx );
 }

 const mbedtls_pk_info_t mbedtls_ecdsa_info = {
     MBEDTLS_PK_ECDSA,
     "ECDSA",
     eckey_get_size,     /* Compatible key structures */
     ecdsa_can_do,
     ecdsa_verify_wrap,
     ecdsa_sign_wrap,
     NULL,
     NULL,
     eckey_check_pair,   /* Compatible key structures */
     ecdsa_alloc_wrap,
     ecdsa_free_wrap,
     eckey_debug,        /* Compatible key structures */
 };
 #endif /* MBEDTLS_ECDSA_C */

 #if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
 /*
  * Support for alternative RSA-private implementations
  */

 static int rsa_alt_can_do( mbedtls_pk_type_t type )
 {
     return( type == MBEDTLS_PK_RSA );
 }

 static size_t rsa_alt_get_size( const void *ctx )
 {
     const mbedtls_rsa_alt_context *rsa_alt = (const mbedtls_rsa_alt_context *) ctx;

     return( 8 * rsa_alt->key_len_func( rsa_alt->key ) );
 }

 static int rsa_alt_sign_wrap( void *ctx, mbedtls_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 )
 {
     mbedtls_rsa_alt_context *rsa_alt = (mbedtls_rsa_alt_context *) ctx;

     *sig_len = rsa_alt->key_len_func( rsa_alt->key );

     return( rsa_alt->sign_func( rsa_alt->key, f_rng, p_rng, MBEDTLS_RSA_PRIVATE,
                 md_alg, (unsigned int) hash_len, hash, sig ) );
 }

 static int rsa_alt_decrypt_wrap( 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 )
 {
     mbedtls_rsa_alt_context *rsa_alt = (mbedtls_rsa_alt_context *) ctx;

     ((void) f_rng);
     ((void) p_rng);

     if( ilen != rsa_alt->key_len_func( rsa_alt->key ) )
         return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );

     return( rsa_alt->decrypt_func( rsa_alt->key,
                 MBEDTLS_RSA_PRIVATE, olen, input, output, osize ) );
 }

 #if defined(MBEDTLS_RSA_C)
 static int rsa_alt_check_pair( const void *pub, const void *prv )
 {
     unsigned char sig[MBEDTLS_MPI_MAX_SIZE];
     unsigned char hash[32];
     size_t sig_len = 0;
     int ret;

     if( rsa_alt_get_size( prv ) != rsa_get_size( pub ) )
         return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );

     memset( hash, 0x2a, sizeof( hash ) );

     if( ( ret = rsa_alt_sign_wrap( (void *) prv, MBEDTLS_MD_NONE,
                                    hash, sizeof( hash ),
                                    sig, &sig_len, NULL, NULL ) ) != 0 )
     {
         return( ret );
     }

     if( rsa_verify_wrap( (void *) pub, MBEDTLS_MD_NONE,
                          hash, sizeof( hash ), sig, sig_len ) != 0 )
     {
         return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
     }

     return( 0 );
 }
 #endif /* MBEDTLS_RSA_C */

 static void *rsa_alt_alloc_wrap( void )
 {
     void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_rsa_alt_context ) );

     if( ctx != NULL )
         memset( ctx, 0, sizeof( mbedtls_rsa_alt_context ) );

     return( ctx );
 }

 static void rsa_alt_free_wrap( void *ctx )
 {
     mbedtls_zeroize( ctx, sizeof( mbedtls_rsa_alt_context ) );
     mbedtls_free( ctx );
 }

 const mbedtls_pk_info_t mbedtls_rsa_alt_info = {
     MBEDTLS_PK_RSA_ALT,
     "RSA-alt",
     rsa_alt_get_size,
     rsa_alt_can_do,
     NULL,
     rsa_alt_sign_wrap,
     rsa_alt_decrypt_wrap,
     NULL,
 #if defined(MBEDTLS_RSA_C)
     rsa_alt_check_pair,
 #else
     NULL,
 #endif
     rsa_alt_alloc_wrap,
     rsa_alt_free_wrap,
     NULL,
 };

 #endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */

 #endif /* MBEDTLS_PK_C */
	/*
	* Public Key abstraction layer: wrapper functions
	*
	* 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(MBEDTLS_CONFIG_FILE)
	#include "mbedtls/config.h"
	#else
	#include MBEDTLS_CONFIG_FILE
	#endif

	#if defined(MBEDTLS_PK_C)
	#include "mbedtls/pk_internal.h"

	/* Even if RSA not activated, for the sake of RSA-alt */
	#include "mbedtls/rsa.h"

	#include <string.h>

	#if defined(MBEDTLS_ECP_C)
	#include "mbedtls/ecp.h"
	#endif

	#if defined(MBEDTLS_ECDSA_C)
	#include "mbedtls/ecdsa.h"
	#endif

	#if defined(MBEDTLS_PLATFORM_C)
	#include "mbedtls/platform.h"
	#else
	#include <stdlib.h>
	#define mbedtls_calloc calloc
	#define mbedtls_free free
	#endif

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

	#if defined(MBEDTLS_RSA_C)
	static int rsa_can_do( mbedtls_pk_type_t type )
	{
	return( type == MBEDTLS_PK_RSA \|\|
	type == MBEDTLS_PK_RSASSA_PSS );
	}

	static size_t rsa_get_size( const void *ctx )
	{
	return( 8 * ((const mbedtls_rsa_context *) ctx)->len );
	}

	static int rsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
	const unsigned char *hash, size_t hash_len,
	const unsigned char *sig, size_t sig_len )
	{
	int ret;

	if( sig_len < ((mbedtls_rsa_context *) ctx)->len )
	return( MBEDTLS_ERR_RSA_VERIFY_FAILED );

	if( ( ret = mbedtls_rsa_pkcs1_verify( (mbedtls_rsa_context *) ctx, NULL, NULL,
	MBEDTLS_RSA_PUBLIC, md_alg,
	(unsigned int) hash_len, hash, sig ) ) != 0 )
	return( ret );

	if( sig_len > ((mbedtls_rsa_context *) ctx)->len )
	return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );

	return( 0 );
	}

	static int rsa_sign_wrap( void *ctx, mbedtls_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 )
	{
	sig_len = ((mbedtls_rsa_context ) ctx)->len;

	return( mbedtls_rsa_pkcs1_sign( (mbedtls_rsa_context *) ctx, f_rng, p_rng, MBEDTLS_RSA_PRIVATE,
	md_alg, (unsigned int) hash_len, hash, sig ) );
	}

	static int rsa_decrypt_wrap( 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 )
	{
	if( ilen != ((mbedtls_rsa_context *) ctx)->len )
	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );

	return( mbedtls_rsa_pkcs1_decrypt( (mbedtls_rsa_context *) ctx, f_rng, p_rng,
	MBEDTLS_RSA_PRIVATE, olen, input, output, osize ) );
	}

	static int rsa_encrypt_wrap( 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 )
	{
	olen = ((mbedtls_rsa_context ) ctx)->len;

	if( *olen > osize )
	return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE );

	return( mbedtls_rsa_pkcs1_encrypt( (mbedtls_rsa_context *) ctx,
	f_rng, p_rng, MBEDTLS_RSA_PUBLIC, ilen, input, output ) );
	}

	static int rsa_check_pair_wrap( const void pub, const void prv )
	{
	return( mbedtls_rsa_check_pub_priv( (const mbedtls_rsa_context *) pub,
	(const mbedtls_rsa_context *) prv ) );
	}

	static void *rsa_alloc_wrap( void )
	{
	void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_rsa_context ) );

	if( ctx != NULL )
	mbedtls_rsa_init( (mbedtls_rsa_context *) ctx, 0, 0 );

	return( ctx );
	}

	static void rsa_free_wrap( void *ctx )
	{
	mbedtls_rsa_free( (mbedtls_rsa_context *) ctx );
	mbedtls_free( ctx );
	}

	static void rsa_debug( const void ctx, mbedtls_pk_debug_item items )
	{
	items->type = MBEDTLS_PK_DEBUG_MPI;
	items->name = "rsa.N";
	items->value = &( ((mbedtls_rsa_context *) ctx)->N );

	items++;

	items->type = MBEDTLS_PK_DEBUG_MPI;
	items->name = "rsa.E";
	items->value = &( ((mbedtls_rsa_context *) ctx)->E );
	}

	const mbedtls_pk_info_t mbedtls_rsa_info = {
	MBEDTLS_PK_RSA,
	"RSA",
	rsa_get_size,
	rsa_can_do,
	rsa_verify_wrap,
	rsa_sign_wrap,
	rsa_decrypt_wrap,
	rsa_encrypt_wrap,
	rsa_check_pair_wrap,
	rsa_alloc_wrap,
	rsa_free_wrap,
	rsa_debug,
	};
	#endif /* MBEDTLS_RSA_C */

	#if defined(MBEDTLS_ECP_C)
	/*
	* Generic EC key
	*/
	static int eckey_can_do( mbedtls_pk_type_t type )
	{
	return( type == MBEDTLS_PK_ECKEY \|\|
	type == MBEDTLS_PK_ECKEY_DH \|\|
	type == MBEDTLS_PK_ECDSA );
	}

	static size_t eckey_get_size( const void *ctx )
	{
	return( ((mbedtls_ecp_keypair *) ctx)->grp.pbits );
	}

	#if defined(MBEDTLS_ECDSA_C)
	/* Forward declarations */
	static int ecdsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
	const unsigned char *hash, size_t hash_len,
	const unsigned char *sig, size_t sig_len );

	static int ecdsa_sign_wrap( void *ctx, mbedtls_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 );

	static int eckey_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
	const unsigned char *hash, size_t hash_len,
	const unsigned char *sig, size_t sig_len )
	{
	int ret;
	mbedtls_ecdsa_context ecdsa;

	mbedtls_ecdsa_init( &ecdsa );

	if( ( ret = mbedtls_ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )
	ret = ecdsa_verify_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len );

	mbedtls_ecdsa_free( &ecdsa );

	return( ret );
	}

	static int eckey_sign_wrap( void *ctx, mbedtls_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 )
	{
	int ret;
	mbedtls_ecdsa_context ecdsa;

	mbedtls_ecdsa_init( &ecdsa );

	if( ( ret = mbedtls_ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )
	ret = ecdsa_sign_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len,
	f_rng, p_rng );

	mbedtls_ecdsa_free( &ecdsa );

	return( ret );
	}

	#endif /* MBEDTLS_ECDSA_C */

	static int eckey_check_pair( const void pub, const void prv )
	{
	return( mbedtls_ecp_check_pub_priv( (const mbedtls_ecp_keypair *) pub,
	(const mbedtls_ecp_keypair *) prv ) );
	}

	static void *eckey_alloc_wrap( void )
	{
	void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecp_keypair ) );

	if( ctx != NULL )
	mbedtls_ecp_keypair_init( ctx );

	return( ctx );
	}

	static void eckey_free_wrap( void *ctx )
	{
	mbedtls_ecp_keypair_free( (mbedtls_ecp_keypair *) ctx );
	mbedtls_free( ctx );
	}

	static void eckey_debug( const void ctx, mbedtls_pk_debug_item items )
	{
	items->type = MBEDTLS_PK_DEBUG_ECP;
	items->name = "eckey.Q";
	items->value = &( ((mbedtls_ecp_keypair *) ctx)->Q );
	}

	const mbedtls_pk_info_t mbedtls_eckey_info = {
	MBEDTLS_PK_ECKEY,
	"EC",
	eckey_get_size,
	eckey_can_do,
	#if defined(MBEDTLS_ECDSA_C)
	eckey_verify_wrap,
	eckey_sign_wrap,
	#else
	NULL,
	NULL,
	#endif
	NULL,
	NULL,
	eckey_check_pair,
	eckey_alloc_wrap,
	eckey_free_wrap,
	eckey_debug,
	};

	/*
	* EC key restricted to ECDH
	*/
	static int eckeydh_can_do( mbedtls_pk_type_t type )
	{
	return( type == MBEDTLS_PK_ECKEY \|\|
	type == MBEDTLS_PK_ECKEY_DH );
	}

	const mbedtls_pk_info_t mbedtls_eckeydh_info = {
	MBEDTLS_PK_ECKEY_DH,
	"EC_DH",
	eckey_get_size, /* Same underlying key structure */
	eckeydh_can_do,
	NULL,
	NULL,
	NULL,
	NULL,
	eckey_check_pair,
	eckey_alloc_wrap, /* Same underlying key structure */
	eckey_free_wrap, /* Same underlying key structure */
	eckey_debug, /* Same underlying key structure */
	};
	#endif /* MBEDTLS_ECP_C */

	#if defined(MBEDTLS_ECDSA_C)
	static int ecdsa_can_do( mbedtls_pk_type_t type )
	{
	return( type == MBEDTLS_PK_ECDSA );
	}

	static int ecdsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
	const unsigned char *hash, size_t hash_len,
	const unsigned char *sig, size_t sig_len )
	{
	int ret;
	((void) md_alg);

	ret = mbedtls_ecdsa_read_signature( (mbedtls_ecdsa_context *) ctx,
	hash, hash_len, sig, sig_len );

	if( ret == MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH )
	return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );

	return( ret );
	}

	static int ecdsa_sign_wrap( void *ctx, mbedtls_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 )
	{
	return( mbedtls_ecdsa_write_signature( (mbedtls_ecdsa_context *) ctx,
	md_alg, hash, hash_len, sig, sig_len, f_rng, p_rng ) );
	}

	static void *ecdsa_alloc_wrap( void )
	{
	void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecdsa_context ) );

	if( ctx != NULL )
	mbedtls_ecdsa_init( (mbedtls_ecdsa_context *) ctx );

	return( ctx );
	}

	static void ecdsa_free_wrap( void *ctx )
	{
	mbedtls_ecdsa_free( (mbedtls_ecdsa_context *) ctx );
	mbedtls_free( ctx );
	}

	const mbedtls_pk_info_t mbedtls_ecdsa_info = {
	MBEDTLS_PK_ECDSA,
	"ECDSA",
	eckey_get_size, /* Compatible key structures */
	ecdsa_can_do,
	ecdsa_verify_wrap,
	ecdsa_sign_wrap,
	NULL,
	NULL,
	eckey_check_pair, /* Compatible key structures */
	ecdsa_alloc_wrap,
	ecdsa_free_wrap,
	eckey_debug, /* Compatible key structures */
	};
	#endif /* MBEDTLS_ECDSA_C */

	#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
	/*
	* Support for alternative RSA-private implementations
	*/

	static int rsa_alt_can_do( mbedtls_pk_type_t type )
	{
	return( type == MBEDTLS_PK_RSA );
	}

	static size_t rsa_alt_get_size( const void *ctx )
	{
	const mbedtls_rsa_alt_context rsa_alt = (const mbedtls_rsa_alt_context ) ctx;

	return( 8 * rsa_alt->key_len_func( rsa_alt->key ) );
	}

	static int rsa_alt_sign_wrap( void *ctx, mbedtls_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 )
	{
	mbedtls_rsa_alt_context rsa_alt = (mbedtls_rsa_alt_context ) ctx;

	*sig_len = rsa_alt->key_len_func( rsa_alt->key );

	return( rsa_alt->sign_func( rsa_alt->key, f_rng, p_rng, MBEDTLS_RSA_PRIVATE,
	md_alg, (unsigned int) hash_len, hash, sig ) );
	}

	static int rsa_alt_decrypt_wrap( 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 )
	{
	mbedtls_rsa_alt_context rsa_alt = (mbedtls_rsa_alt_context ) ctx;

	((void) f_rng);
	((void) p_rng);

	if( ilen != rsa_alt->key_len_func( rsa_alt->key ) )
	return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );

	return( rsa_alt->decrypt_func( rsa_alt->key,
	MBEDTLS_RSA_PRIVATE, olen, input, output, osize ) );
	}

	#if defined(MBEDTLS_RSA_C)
	static int rsa_alt_check_pair( const void pub, const void prv )
	{
	unsigned char sig[MBEDTLS_MPI_MAX_SIZE];
	unsigned char hash[32];
	size_t sig_len = 0;
	int ret;

	if( rsa_alt_get_size( prv ) != rsa_get_size( pub ) )
	return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );

	memset( hash, 0x2a, sizeof( hash ) );

	if( ( ret = rsa_alt_sign_wrap( (void *) prv, MBEDTLS_MD_NONE,
	hash, sizeof( hash ),
	sig, &sig_len, NULL, NULL ) ) != 0 )
	{
	return( ret );
	}

	if( rsa_verify_wrap( (void *) pub, MBEDTLS_MD_NONE,
	hash, sizeof( hash ), sig, sig_len ) != 0 )
	{
	return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
	}

	return( 0 );
	}
	#endif /* MBEDTLS_RSA_C */

	static void *rsa_alt_alloc_wrap( void )
	{
	void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_rsa_alt_context ) );

	if( ctx != NULL )
	memset( ctx, 0, sizeof( mbedtls_rsa_alt_context ) );

	return( ctx );
	}

	static void rsa_alt_free_wrap( void *ctx )
	{
	mbedtls_zeroize( ctx, sizeof( mbedtls_rsa_alt_context ) );
	mbedtls_free( ctx );
	}

	const mbedtls_pk_info_t mbedtls_rsa_alt_info = {
	MBEDTLS_PK_RSA_ALT,
	"RSA-alt",
	rsa_alt_get_size,
	rsa_alt_can_do,
	NULL,
	rsa_alt_sign_wrap,
	rsa_alt_decrypt_wrap,
	NULL,
	#if defined(MBEDTLS_RSA_C)
	rsa_alt_check_pair,
	#else
	NULL,
	#endif
	rsa_alt_alloc_wrap,
	rsa_alt_free_wrap,
	NULL,
	};

	#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */

	#endif /* MBEDTLS_PK_C */