e_cswift.c

mediastreamer2是开源的网络传输媒体流的库

/* (de)initialisation functions. */
static int cswift_init(ENGINE *e)
	{
        SW_CONTEXT_HANDLE hac;
        t_swAcquireAccContext *p1;
        t_swAttachKeyParam *p2;
        t_swSimpleRequest *p3;
        t_swReleaseAccContext *p4;

	if(cswift_dso != NULL)
		{
		CSWIFTerr(CSWIFT_F_CSWIFT_INIT,CSWIFT_R_ALREADY_LOADED);
		goto err;
		}
	/* Attempt to load libswift.so/swift.dll/whatever. */
	cswift_dso = DSO_load(NULL, get_CSWIFT_LIBNAME(), NULL, 0);
	if(cswift_dso == NULL)
		{
		CSWIFTerr(CSWIFT_F_CSWIFT_INIT,CSWIFT_R_NOT_LOADED);
		goto err;
		}
	if(!(p1 = (t_swAcquireAccContext *)
				DSO_bind_func(cswift_dso, CSWIFT_F1)) ||
			!(p2 = (t_swAttachKeyParam *)
				DSO_bind_func(cswift_dso, CSWIFT_F2)) ||
			!(p3 = (t_swSimpleRequest *)
				DSO_bind_func(cswift_dso, CSWIFT_F3)) ||
			!(p4 = (t_swReleaseAccContext *)
				DSO_bind_func(cswift_dso, CSWIFT_F4)))
		{
		CSWIFTerr(CSWIFT_F_CSWIFT_INIT,CSWIFT_R_NOT_LOADED);
		goto err;
		}
	/* Copy the pointers */
	p_CSwift_AcquireAccContext = p1;
	p_CSwift_AttachKeyParam = p2;
	p_CSwift_SimpleRequest = p3;
	p_CSwift_ReleaseAccContext = p4;
	/* Try and get a context - if not, we may have a DSO but no
	 * accelerator! */
	if(!get_context(&hac))
		{
		CSWIFTerr(CSWIFT_F_CSWIFT_INIT,CSWIFT_R_UNIT_FAILURE);
		goto err;
		}
	release_context(hac);
	/* Everything's fine. */
	return 1;
err:
	if(cswift_dso)
	{
		DSO_free(cswift_dso);
		cswift_dso = NULL;
	}
	p_CSwift_AcquireAccContext = NULL;
	p_CSwift_AttachKeyParam = NULL;
	p_CSwift_SimpleRequest = NULL;
	p_CSwift_ReleaseAccContext = NULL;
	return 0;
	}

static int cswift_finish(ENGINE *e)
	{
	free_CSWIFT_LIBNAME();
	if(cswift_dso == NULL)
		{
		CSWIFTerr(CSWIFT_F_CSWIFT_FINISH,CSWIFT_R_NOT_LOADED);
		return 0;
		}
	if(!DSO_free(cswift_dso))
		{
		CSWIFTerr(CSWIFT_F_CSWIFT_FINISH,CSWIFT_R_UNIT_FAILURE);
		return 0;
		}
	cswift_dso = NULL;
	p_CSwift_AcquireAccContext = NULL;
	p_CSwift_AttachKeyParam = NULL;
	p_CSwift_SimpleRequest = NULL;
	p_CSwift_ReleaseAccContext = NULL;
	return 1;
	}

static int cswift_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void))
	{
	int initialised = ((cswift_dso == NULL) ? 0 : 1);
	switch(cmd)
		{
	case CSWIFT_CMD_SO_PATH:
		if(p == NULL)
			{
			CSWIFTerr(CSWIFT_F_CSWIFT_CTRL,ERR_R_PASSED_NULL_PARAMETER);
			return 0;
			}
		if(initialised)
			{
			CSWIFTerr(CSWIFT_F_CSWIFT_CTRL,CSWIFT_R_ALREADY_LOADED);
			return 0;
			}
		return set_CSWIFT_LIBNAME((const char *)p);
	default:
		break;
		}
	CSWIFTerr(CSWIFT_F_CSWIFT_CTRL,CSWIFT_R_CTRL_COMMAND_NOT_IMPLEMENTED);
	return 0;
	}

/* Un petit mod_exp */
static int cswift_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
			const BIGNUM *m, BN_CTX *ctx)
	{
	/* I need somewhere to store temporary serialised values for
	 * use with the CryptoSwift API calls. A neat cheat - I'll use
	 * BIGNUMs from the BN_CTX but access their arrays directly as
	 * byte arrays <grin>. This way I don't have to clean anything
	 * up. */
	BIGNUM *modulus;
	BIGNUM *exponent;
	BIGNUM *argument;
	BIGNUM *result;
	SW_STATUS sw_status;
	SW_LARGENUMBER arg, res;
	SW_PARAM sw_param;
	SW_CONTEXT_HANDLE hac;
	int to_return, acquired;
 
	modulus = exponent = argument = result = NULL;
	to_return = 0; /* expect failure */
	acquired = 0;
 
	if(!get_context(&hac))
		{
		CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_UNIT_FAILURE);
		goto err;
		}
	acquired = 1;
	/* Prepare the params */
	BN_CTX_start(ctx);
	modulus = BN_CTX_get(ctx);
	exponent = BN_CTX_get(ctx);
	argument = BN_CTX_get(ctx);
	result = BN_CTX_get(ctx);
	if(!result)
		{
		CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_BN_CTX_FULL);
		goto err;
		}
	if(!bn_wexpand(modulus, m->top) || !bn_wexpand(exponent, p->top) ||
		!bn_wexpand(argument, a->top) || !bn_wexpand(result, m->top))
		{
		CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_BN_EXPAND_FAIL);
		goto err;
		}
	sw_param.type = SW_ALG_EXP;
	sw_param.up.exp.modulus.nbytes = BN_bn2bin(m,
		(unsigned char *)modulus->d);
	sw_param.up.exp.modulus.value = (unsigned char *)modulus->d;
	sw_param.up.exp.exponent.nbytes = BN_bn2bin(p,
		(unsigned char *)exponent->d);
	sw_param.up.exp.exponent.value = (unsigned char *)exponent->d;
	/* Attach the key params */
	sw_status = p_CSwift_AttachKeyParam(hac, &sw_param);
	switch(sw_status)
		{
	case SW_OK:
		break;
	case SW_ERR_INPUT_SIZE:
		CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_BAD_KEY_SIZE);
		goto err;
	default:
		{
		char tmpbuf[DECIMAL_SIZE(sw_status)+1];
		CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_REQUEST_FAILED);
		sprintf(tmpbuf, "%ld", sw_status);
		ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
		}
		goto err;
		}
	/* Prepare the argument and response */
	arg.nbytes = BN_bn2bin(a, (unsigned char *)argument->d);
	arg.value = (unsigned char *)argument->d;
	res.nbytes = BN_num_bytes(m);
	memset(result->d, 0, res.nbytes);
	res.value = (unsigned char *)result->d;
	/* Perform the operation */
	if((sw_status = p_CSwift_SimpleRequest(hac, SW_CMD_MODEXP, &arg, 1,
		&res, 1)) != SW_OK)
		{
		char tmpbuf[DECIMAL_SIZE(sw_status)+1];
		CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_REQUEST_FAILED);
		sprintf(tmpbuf, "%ld", sw_status);
		ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
		goto err;
		}
	/* Convert the response */
	BN_bin2bn((unsigned char *)result->d, res.nbytes, r);
	to_return = 1;
err:
	if(acquired)
		release_context(hac);
	BN_CTX_end(ctx);
	return to_return;
	}


#ifndef OPENSSL_NO_RSA
int cswift_bn_32copy(SW_LARGENUMBER * out, const BIGNUM * in)
{
	int mod;
	int numbytes = BN_num_bytes(in);

	mod = 0;
	while( ((out->nbytes = (numbytes+mod)) % 32) )
	{
		mod++;
	}
	out->value = (unsigned char*)OPENSSL_malloc(out->nbytes);
	if(!out->value)
	{
		return 0;
	}
	BN_bn2bin(in, &out->value[mod]);
	if(mod)
		memset(out->value, 0, mod);

	return 1;
}
#endif

#ifndef OPENSSL_NO_RSA
/* Un petit mod_exp chinois */
static int cswift_mod_exp_crt(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
			const BIGNUM *q, const BIGNUM *dmp1,
			const BIGNUM *dmq1, const BIGNUM *iqmp, BN_CTX *ctx)
	{
	SW_STATUS sw_status;
	SW_LARGENUMBER arg, res;
	SW_PARAM sw_param;
	SW_CONTEXT_HANDLE hac;
	BIGNUM *result = NULL;
	BIGNUM *argument = NULL;
	int to_return = 0; /* expect failure */
	int acquired = 0;

	sw_param.up.crt.p.value = NULL;
	sw_param.up.crt.q.value = NULL;
	sw_param.up.crt.dmp1.value = NULL;
	sw_param.up.crt.dmq1.value = NULL;
	sw_param.up.crt.iqmp.value = NULL;
 
	if(!get_context(&hac))
		{
		CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_UNIT_FAILURE);
		goto err;
		}
	acquired = 1;

	/* Prepare the params */
	argument = BN_new();
	result = BN_new();
	if(!result || !argument)
		{
		CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_BN_CTX_FULL);
		goto err;
		}


	sw_param.type = SW_ALG_CRT;
	/************************************************************************/
	/* 04/02/2003                                                           */
	/* Modified by Frederic Giudicelli (deny-all.com) to overcome the       */
	/* limitation of cswift with values not a multiple of 32                */
	/************************************************************************/
	if(!cswift_bn_32copy(&sw_param.up.crt.p, p))
	{
		CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_BN_EXPAND_FAIL);
		goto err;
	}
	if(!cswift_bn_32copy(&sw_param.up.crt.q, q))
	{
		CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_BN_EXPAND_FAIL);
		goto err;
	}
	if(!cswift_bn_32copy(&sw_param.up.crt.dmp1, dmp1))
	{
		CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_BN_EXPAND_FAIL);
		goto err;
	}
	if(!cswift_bn_32copy(&sw_param.up.crt.dmq1, dmq1))
	{
		CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_BN_EXPAND_FAIL);
		goto err;
	}
	if(!cswift_bn_32copy(&sw_param.up.crt.iqmp, iqmp))
	{
		CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_BN_EXPAND_FAIL);
		goto err;
	}
	if(	!bn_wexpand(argument, a->top) ||
			!bn_wexpand(result, p->top + q->top))
		{
		CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_BN_EXPAND_FAIL);
		goto err;
		}

	/* Attach the key params */
	sw_status = p_CSwift_AttachKeyParam(hac, &sw_param);
	switch(sw_status)
		{
	case SW_OK:
		break;
	case SW_ERR_INPUT_SIZE:
		CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_BAD_KEY_SIZE);
		goto err;
	default:
		{
		char tmpbuf[DECIMAL_SIZE(sw_status)+1];
		CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_REQUEST_FAILED);
		sprintf(tmpbuf, "%ld", sw_status);
		ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
		}
		goto err;
		}
	/* Prepare the argument and response */
	arg.nbytes = BN_bn2bin(a, (unsigned char *)argument->d);
	arg.value = (unsigned char *)argument->d;
	res.nbytes = 2 * BN_num_bytes(p);
	memset(result->d, 0, res.nbytes);
	res.value = (unsigned char *)result->d;
	/* Perform the operation */
	if((sw_status = p_CSwift_SimpleRequest(hac, SW_CMD_MODEXP_CRT, &arg, 1,
		&res, 1)) != SW_OK)
		{
		char tmpbuf[DECIMAL_SIZE(sw_status)+1];
		CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_REQUEST_FAILED);
		sprintf(tmpbuf, "%ld", sw_status);
		ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
		goto err;
		}
	/* Convert the response */
	BN_bin2bn((unsigned char *)result->d, res.nbytes, r);
	to_return = 1;
err:
	if(sw_param.up.crt.p.value)
		OPENSSL_free(sw_param.up.crt.p.value);
	if(sw_param.up.crt.q.value)
		OPENSSL_free(sw_param.up.crt.q.value);
	if(sw_param.up.crt.dmp1.value)
		OPENSSL_free(sw_param.up.crt.dmp1.value);
	if(sw_param.up.crt.dmq1.value)
		OPENSSL_free(sw_param.up.crt.dmq1.value);
	if(sw_param.up.crt.iqmp.value)
		OPENSSL_free(sw_param.up.crt.iqmp.value);
	if(result)
		BN_free(result);
	if(argument)
		BN_free(argument);
	if(acquired)
		release_context(hac);
	return to_return;
	}
#endif
 
#ifndef OPENSSL_NO_RSA
static int cswift_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx)
	{
	int to_return = 0;
	const RSA_METHOD * def_rsa_method;

	/* Try the limits of RSA (2048 bits) */
	if(BN_num_bytes(rsa->p) > 128 ||
		BN_num_bytes(rsa->q) > 128 ||
		BN_num_bytes(rsa->dmp1) > 128 ||
		BN_num_bytes(rsa->dmq1) > 128 ||
		BN_num_bytes(rsa->iqmp) > 128)
	{
#ifdef RSA_NULL