long ssl3_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
	{
	CERT *cert;

	cert=ctx->cert;

	switch (cmd)
		{
#ifndef OPENSSL_NO_RSA
	case SSL_CTRL_NEED_TMP_RSA:
		if (	(cert->rsa_tmp == NULL) &&
			((cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL) ||
			 (EVP_PKEY_size(cert->pkeys[SSL_PKEY_RSA_ENC].privatekey) > (512/8)))
			)
			return(1);
		else
			return(0);
		/* break; */
	case SSL_CTRL_SET_TMP_RSA:
		{
		RSA *rsa;
		int i;

		rsa=(RSA *)parg;
		i=1;
		if (rsa == NULL)
			i=0;
		else
			{
			if ((rsa=RSAPrivateKey_dup(rsa)) == NULL)
				i=0;
			}
		if (!i)
			{
			SSLerr(SSL_F_SSL3_CTX_CTRL,ERR_R_RSA_LIB);
			return(0);
			}
		else
			{
			if (cert->rsa_tmp != NULL)
				RSA_free(cert->rsa_tmp);
			cert->rsa_tmp=rsa;
			return(1);
			}
		}
		/* break; */
	case SSL_CTRL_SET_TMP_RSA_CB:
		{
		SSLerr(SSL_F_SSL3_CTX_CTRL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		return(0);
		}
		break;
#endif
#ifndef OPENSSL_NO_DH
	case SSL_CTRL_SET_TMP_DH:
		{
		DH *new=NULL,*dh;

		dh=(DH *)parg;
		if ((new=DHparams_dup(dh)) == NULL)
			{
			SSLerr(SSL_F_SSL3_CTX_CTRL,ERR_R_DH_LIB);
			return 0;
			}
		if (!(ctx->options & SSL_OP_SINGLE_DH_USE))
			{
			if (!DH_generate_key(new))
				{
				SSLerr(SSL_F_SSL3_CTX_CTRL,ERR_R_DH_LIB);
				DH_free(new);
				return 0;
				}
			}
		if (cert->dh_tmp != NULL)
			DH_free(cert->dh_tmp);
		cert->dh_tmp=new;
		return 1;
		}
		/*break; */
	case SSL_CTRL_SET_TMP_DH_CB:
		{
		SSLerr(SSL_F_SSL3_CTX_CTRL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		return(0);
		}
		break;
#endif
#ifndef OPENSSL_NO_ECDH
	case SSL_CTRL_SET_TMP_ECDH:
		{
		EC_KEY *ecdh = NULL;
 			
		if (parg == NULL)
			{
			SSLerr(SSL_F_SSL3_CTX_CTRL,ERR_R_ECDH_LIB);
			return 0;
			}
		ecdh = EC_KEY_dup((EC_KEY *)parg);
		if (ecdh == NULL)
			{
			SSLerr(SSL_F_SSL3_CTX_CTRL,ERR_R_EC_LIB);
			return 0;
			}
		if (!(ctx->options & SSL_OP_SINGLE_ECDH_USE))
			{
			if (!EC_KEY_generate_key(ecdh))
				{
				EC_KEY_free(ecdh);
				SSLerr(SSL_F_SSL3_CTX_CTRL,ERR_R_ECDH_LIB);
				return 0;
				}
			}

		if (cert->ecdh_tmp != NULL)
			{
			EC_KEY_free(cert->ecdh_tmp);
			}
		cert->ecdh_tmp = ecdh;
		return 1;
		}
		/* break; */
	case SSL_CTRL_SET_TMP_ECDH_CB:
		{
		SSLerr(SSL_F_SSL3_CTX_CTRL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		return(0);
		}
		break;
#endif /* !OPENSSL_NO_ECDH */
#ifndef OPENSSL_NO_TLSEXT
	case SSL_CTRL_SET_TLSEXT_SERVERNAME_ARG:
		ctx->tlsext_servername_arg=parg;
		break;
	case SSL_CTRL_SET_TLSEXT_TICKET_KEYS:
	case SSL_CTRL_GET_TLSEXT_TICKET_KEYS:
		{
		unsigned char *keys = parg;
		if (!keys)
			return 48;
		if (larg != 48)
			{
			SSLerr(SSL_F_SSL3_CTX_CTRL, SSL_R_INVALID_TICKET_KEYS_LENGTH);
			return 0;
			}
		if (cmd == SSL_CTRL_SET_TLSEXT_TICKET_KEYS)
			{
			memcpy(ctx->tlsext_tick_key_name, keys, 16);
			memcpy(ctx->tlsext_tick_hmac_key, keys + 16, 16);
			memcpy(ctx->tlsext_tick_aes_key, keys + 32, 16);
			}
		else
			{
			memcpy(keys, ctx->tlsext_tick_key_name, 16);
			memcpy(keys + 16, ctx->tlsext_tick_hmac_key, 16);
			memcpy(keys + 32, ctx->tlsext_tick_aes_key, 16);
			}
		return 1;
		}

#ifdef TLSEXT_TYPE_opaque_prf_input
	case SSL_CTRL_SET_TLSEXT_OPAQUE_PRF_INPUT_CB_ARG:
		ctx->tlsext_opaque_prf_input_callback_arg = parg;
		return 1;
#endif

	case SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB_ARG:
		ctx->tlsext_status_arg=parg;
		return 1;
		break;

#ifndef OPENSSL_NO_SRP
	case SSL_CTRL_SET_TLS_EXT_SRP_USERNAME:
		ctx->srp_ctx.srp_Mask|=SSL_kSRP;
		if (ctx->srp_ctx.login != NULL)
			OPENSSL_free(ctx->srp_ctx.login);
		ctx->srp_ctx.login = NULL;
		if (parg == NULL)
			break;
		if (strlen((const char *)parg) > 255 || strlen((const char *)parg) < 1)
			{
			SSLerr(SSL_F_SSL3_CTX_CTRL, SSL_R_INVALID_SRP_USERNAME);
			return 0;
			} 
		if ((ctx->srp_ctx.login = BUF_strdup((char *)parg)) == NULL)
			{
			SSLerr(SSL_F_SSL3_CTX_CTRL, ERR_R_INTERNAL_ERROR);
			return 0;
			}
		break;
	case SSL_CTRL_SET_TLS_EXT_SRP_PASSWORD:
		ctx->srp_ctx.SRP_give_srp_client_pwd_callback=srp_password_from_info_cb;
		ctx->srp_ctx.info=parg;
		break;
	case SSL_CTRL_SET_SRP_ARG:
		ctx->srp_ctx.srp_Mask|=SSL_kSRP;
		ctx->srp_ctx.SRP_cb_arg=parg;
		break;

	case SSL_CTRL_SET_TLS_EXT_SRP_STRENGTH:
		ctx->srp_ctx.strength=larg;
		break;
#endif
#endif /* !OPENSSL_NO_TLSEXT */

	/* A Thawte special :-) */
	case SSL_CTRL_EXTRA_CHAIN_CERT:
		if (ctx->extra_certs == NULL)
			{
			if ((ctx->extra_certs=sk_X509_new_null()) == NULL)
				return(0);
			}
		sk_X509_push(ctx->extra_certs,(X509 *)parg);
		break;

	case SSL_CTRL_GET_EXTRA_CHAIN_CERTS:
		*(STACK_OF(X509) **)parg =  ctx->extra_certs;
		break;

	case SSL_CTRL_CLEAR_EXTRA_CHAIN_CERTS:
		if (ctx->extra_certs)
			{
			sk_X509_pop_free(ctx->extra_certs, X509_free);
			ctx->extra_certs = NULL;
			}
		break;

	default:
		return(0);
		}
	return(1);
	}

This weakness pertains to the use of cryptographic functions that are weak, misconfigured, or outdated, which undermines the intended protection of encrypted data and communications.