static int RSA_eay_private_decrypt(int flen, const unsigned char *from,
	     unsigned char *to, RSA *rsa, int padding)
	{
	BIGNUM *f, *ret, *br;
	int j,num=0,r= -1;
	unsigned char *p;
	unsigned char *buf=NULL;
	BN_CTX *ctx=NULL;
	int local_blinding = 0;
	BN_BLINDING *blinding = NULL;

	if((ctx = BN_CTX_new()) == NULL) goto err;
	BN_CTX_start(ctx);
	f   = BN_CTX_get(ctx);
	br  = BN_CTX_get(ctx);
	ret = BN_CTX_get(ctx);
	num = BN_num_bytes(rsa->n);
	buf = OPENSSL_malloc(num);
	if(!f || !ret || !buf)
		{
		RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,ERR_R_MALLOC_FAILURE);
		goto err;
		}

	/* This check was for equality but PGP does evil things
	 * and chops off the top '0' bytes */
	if (flen > num)
		{
		RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_DATA_GREATER_THAN_MOD_LEN);
		goto err;
		}

	/* make data into a big number */
	if (BN_bin2bn(from,(int)flen,f) == NULL) goto err;

	if (BN_ucmp(f, rsa->n) >= 0)
		{
		RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_DATA_TOO_LARGE_FOR_MODULUS);
		goto err;
		}

	if (!(rsa->flags & RSA_FLAG_NO_BLINDING))
		{
		blinding = rsa_get_blinding(rsa, &local_blinding, ctx);
		if (blinding == NULL)
			{
			RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, ERR_R_INTERNAL_ERROR);
			goto err;
			}
		}
	
	if (blinding != NULL)
		if (!rsa_blinding_convert(blinding, local_blinding, f, br, ctx))
			goto err;

	/* do the decrypt */
	if ( (rsa->flags & RSA_FLAG_EXT_PKEY) ||
		((rsa->p != NULL) &&
		(rsa->q != NULL) &&
		(rsa->dmp1 != NULL) &&
		(rsa->dmq1 != NULL) &&
		(rsa->iqmp != NULL)) )
		{
		if (!rsa->meth->rsa_mod_exp(ret, f, rsa, ctx)) goto err;
		}
	else
		{
		BIGNUM local_d;
		BIGNUM *d = NULL;
		
		if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
			{
			d = &local_d;
			BN_with_flags(d, rsa->d, BN_FLG_CONSTTIME);
			}
		else
			d = rsa->d;

		MONT_HELPER(rsa, ctx, n, rsa->flags & RSA_FLAG_CACHE_PUBLIC, goto err);
		if (!rsa->meth->bn_mod_exp(ret,f,d,rsa->n,ctx,
				rsa->_method_mod_n))
		  goto err;
		}

	if (blinding)
		if (!rsa_blinding_invert(blinding, local_blinding, ret, br, ctx))
			goto err;

	p=buf;
	j=BN_bn2bin(ret,p); /* j is only used with no-padding mode */

	switch (padding)
		{
	case RSA_PKCS1_PADDING:
		r=RSA_padding_check_PKCS1_type_2(to,num,buf,j,num);
		break;
#ifndef OPENSSL_NO_SHA
        case RSA_PKCS1_OAEP_PADDING:
	        r=RSA_padding_check_PKCS1_OAEP(to,num,buf,j,num,NULL,0);
                break;
#endif
 	case RSA_SSLV23_PADDING:
		r=RSA_padding_check_SSLv23(to,num,buf,j,num);
		break;
	case RSA_NO_PADDING:
		r=RSA_padding_check_none(to,num,buf,j,num);
		break;
	default:
		RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
		goto err;
		}
	if (r < 0)
		RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_PADDING_CHECK_FAILED);

err:
	if (ctx != NULL)
		{
		BN_CTX_end(ctx);
		BN_CTX_free(ctx);
		}
	if (buf != NULL)
		{
		OPENSSL_cleanse(buf,num);
		OPENSSL_free(buf);
		}
	return(r);
	}