rsaref.c

开源的ssl算法openssl,版本0.9.8H

/* Demo of how to construct your own engine and using it.  The basis of this
   engine is RSAref, an old reference of the RSA algorithm which can still
   be found a little here and there. */

#include <stdio.h>
#include <string.h>
#include "./source/global.h"
#include "./source/rsaref.h"
#include "./source/rsa.h"
#include "./source/des.h"
#include <openssl/err.h>
#define OPENSSL_NO_MD2
#define OPENSSL_NO_MD5
#include <openssl/evp.h>
#include <openssl/bn.h>
#include <openssl/engine.h>

#define RSAREF_LIB_NAME "rsaref engine"
#include "rsaref_err.c"

/*****************************************************************************
 *** Function declarations and global variable definitions                 ***
 *****************************************************************************/

/*****************************************************************************
 * Constants used when creating the ENGINE
 **/
static const char *engine_rsaref_id = "rsaref";
static const char *engine_rsaref_name = "RSAref engine support";

/*****************************************************************************
 * Functions to handle the engine
 **/
static int rsaref_destroy(ENGINE *e);
static int rsaref_init(ENGINE *e);
static int rsaref_finish(ENGINE *e);
#if 0
static int rsaref_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)()); 
#endif

/*****************************************************************************
 * Engine commands
 **/
static const ENGINE_CMD_DEFN rsaref_cmd_defns[] = {
	{0, NULL, NULL, 0}
	};

/*****************************************************************************
 * RSA functions
 **/
static int rsaref_private_decrypt(int len, const unsigned char *from,
	unsigned char *to, RSA *rsa, int padding);
static int rsaref_private_encrypt(int len, const unsigned char *from,
	unsigned char *to, RSA *rsa, int padding);
static int rsaref_public_encrypt(int len, const unsigned char *from,
	unsigned char *to, RSA *rsa, int padding);
static int rsaref_public_decrypt(int len, const unsigned char *from,
	unsigned char *to, RSA *rsa, int padding);
static int bnref_mod_exp(BIGNUM *r,const BIGNUM *a,const BIGNUM *p,const BIGNUM *m,
			  BN_CTX *ctx, BN_MONT_CTX *m_ctx);
static int rsaref_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa);

/*****************************************************************************
 * Our RSA method
 **/
static RSA_METHOD rsaref_rsa =
{
  "RSAref PKCS#1 RSA",
  rsaref_public_encrypt,
  rsaref_public_decrypt,
  rsaref_private_encrypt,
  rsaref_private_decrypt,
  rsaref_mod_exp,
  bnref_mod_exp,
  NULL,
  NULL,
  0,
  NULL,
  NULL,
  NULL
};

/*****************************************************************************
 * Symetric cipher and digest function registrars
 **/
static int rsaref_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
	const int **nids, int nid);
static int rsaref_digests(ENGINE *e, const EVP_MD **digest,
	const int **nids, int nid);

static int rsaref_cipher_nids[] =
	{ NID_des_cbc, NID_des_ede3_cbc, NID_desx_cbc, 0 };
static int rsaref_digest_nids[] =
	{ NID_md2, NID_md5, 0 };

/*****************************************************************************
 * DES functions
 **/
static int cipher_des_cbc_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
	const unsigned char *iv, int enc);
static int cipher_des_cbc_code(EVP_CIPHER_CTX *ctx, unsigned char *out,
	const unsigned char *in, unsigned int inl);
static int cipher_des_cbc_clean(EVP_CIPHER_CTX *);
static int cipher_des_ede3_cbc_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
	const unsigned char *iv, int enc);
static int cipher_des_ede3_cbc_code(EVP_CIPHER_CTX *ctx, unsigned char *out,
	const unsigned char *in, unsigned int inl);
static int cipher_des_ede3_cbc_clean(EVP_CIPHER_CTX *);
static int cipher_desx_cbc_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
	const unsigned char *iv, int enc);
static int cipher_desx_cbc_code(EVP_CIPHER_CTX *ctx, unsigned char *out,
	const unsigned char *in, unsigned int inl);
static int cipher_desx_cbc_clean(EVP_CIPHER_CTX *);

/*****************************************************************************
 * Our DES ciphers
 **/
static const EVP_CIPHER cipher_des_cbc =
	{
	NID_des_cbc,
	8, 8, 8,
	0 | EVP_CIPH_CBC_MODE,
	cipher_des_cbc_init,
	cipher_des_cbc_code,
	cipher_des_cbc_clean,
	sizeof(DES_CBC_CTX),
	NULL,
	NULL,
	NULL,
	NULL
	};

static const EVP_CIPHER cipher_des_ede3_cbc =
	{
	NID_des_ede3_cbc,
	8, 24, 8,
	0 | EVP_CIPH_CBC_MODE,
	cipher_des_ede3_cbc_init,
	cipher_des_ede3_cbc_code,
	cipher_des_ede3_cbc_clean,
	sizeof(DES3_CBC_CTX),
	NULL,
	NULL,
	NULL,
	NULL
	};

static const EVP_CIPHER cipher_desx_cbc =
	{
	NID_desx_cbc,
	8, 24, 8,
	0 | EVP_CIPH_CBC_MODE,
	cipher_desx_cbc_init,
	cipher_desx_cbc_code,
	cipher_desx_cbc_clean,
	sizeof(DESX_CBC_CTX),
	NULL,
	NULL,
	NULL,
	NULL
	};

/*****************************************************************************
 * MD functions
 **/
static int digest_md2_init(EVP_MD_CTX *ctx);
static int digest_md2_update(EVP_MD_CTX *ctx,const void *data,
	unsigned long count);
static int digest_md2_final(EVP_MD_CTX *ctx,unsigned char *md);
static int digest_md5_init(EVP_MD_CTX *ctx);
static int digest_md5_update(EVP_MD_CTX *ctx,const void *data,
	unsigned long count);
static int digest_md5_final(EVP_MD_CTX *ctx,unsigned char *md);

/*****************************************************************************
 * Our MD digests
 **/
static const EVP_MD digest_md2 =
	{
	NID_md2,
	NID_md2WithRSAEncryption,
	16,
	0,
	digest_md2_init,
	digest_md2_update,
	digest_md2_final,
	NULL,
	NULL,
	EVP_PKEY_RSA_method,
	16,
	sizeof(MD2_CTX)
	};

static const EVP_MD digest_md5 =
	{
	NID_md5,
	NID_md5WithRSAEncryption,
	16,
	0,
	digest_md5_init,
	digest_md5_update,
	digest_md5_final,
	NULL,
	NULL,
	EVP_PKEY_RSA_method,
	64,
	sizeof(MD5_CTX)
	};

/*****************************************************************************
 *** Function definitions                                                  ***
 *****************************************************************************/

/*****************************************************************************
 * Functions to handle the engine
 **/

static int bind_rsaref(ENGINE *e)
	{
	const RSA_METHOD *meth1;
	if(!ENGINE_set_id(e, engine_rsaref_id)
		|| !ENGINE_set_name(e, engine_rsaref_name)
		|| !ENGINE_set_RSA(e, &rsaref_rsa)
		|| !ENGINE_set_ciphers(e, rsaref_ciphers)
		|| !ENGINE_set_digests(e, rsaref_digests)
		|| !ENGINE_set_destroy_function(e, rsaref_destroy)
		|| !ENGINE_set_init_function(e, rsaref_init)
		|| !ENGINE_set_finish_function(e, rsaref_finish)
		/* || !ENGINE_set_ctrl_function(e, rsaref_ctrl) */
		/* || !ENGINE_set_cmd_defns(e, rsaref_cmd_defns) */)
		return 0;

	/* Ensure the rsaref error handling is set up */
	ERR_load_RSAREF_strings();
	return 1;
	}

#ifdef ENGINE_DYNAMIC_SUPPORT
static int bind_helper(ENGINE *e, const char *id)
	{
	if(id && (strcmp(id, engine_rsaref_id) != 0))
		return 0;
	if(!bind_rsaref(e))
		return 0;
	return 1;
	}       
IMPLEMENT_DYNAMIC_CHECK_FN()
IMPLEMENT_DYNAMIC_BIND_FN(bind_helper)
#else
static ENGINE *engine_rsaref(void)
	{
	ENGINE *ret = ENGINE_new();
	if(!ret)
		return NULL;
	if(!bind_rsaref(ret))
		{
		ENGINE_free(ret);
		return NULL;
		}
	return ret;
	}

void ENGINE_load_rsaref(void)
	{
	/* Copied from eng_[openssl|dyn].c */
	ENGINE *toadd = engine_rsaref();
	if(!toadd) return;
	ENGINE_add(toadd);
	ENGINE_free(toadd);
	ERR_clear_error();
	}
#endif

/* Initiator which is only present to make sure this engine looks available */
static int rsaref_init(ENGINE *e)
	{
	return 1;
	}

/* Finisher which is only present to make sure this engine looks available */
static int rsaref_finish(ENGINE *e)
	{
	return 1;
	}

/* Destructor (complements the "ENGINE_ncipher()" constructor) */
static int rsaref_destroy(ENGINE *e)
	{
	ERR_unload_RSAREF_strings();
	return 1;
	}

/*****************************************************************************
 * RSA functions
 **/

static int rsaref_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa)
	{
	RSAREFerr(RSAREF_F_RSAREF_MOD_EXP,ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
	return(0);
	}

static int bnref_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
			  const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
	{
	RSAREFerr(RSAREF_F_BNREF_MOD_EXP,ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
	return(0);
	}

/* unsigned char *to:  [max]    */
static int RSAref_bn2bin(BIGNUM *from, unsigned char *to, int max)
	{
	int i;

	i=BN_num_bytes(from);
	if (i > max)
		{
		RSAREFerr(RSAREF_F_RSAREF_BN2BIN,RSAREF_R_LEN);
		return(0);
		}

	memset(to,0,(unsigned int)max);
	if (!BN_bn2bin(from,&(to[max-i])))
		return(0);
	return(1);
	}

#ifdef undef
/* unsigned char *from:  [max]    */
static BIGNUM *RSAref_bin2bn(unsigned char *from, BIGNUM *to, int max)
	{
	int i;
	BIGNUM *ret;

	for (i=0; i<max; i++)
		if (from[i]) break;

	ret=BN_bin2bn(&(from[i]),max-i,to);
	return(ret);
	}

static int RSAref_Public_ref2eay(RSArefPublicKey *from, RSA *to)
	{