SSL3_CC_WRITE
#define SSL3_CHANGE_CIPHER_CLIENT_WRITE (SSL3_CC_CLIENT | SSL3_CC_WRITE)
#define SSL3_CHANGE_CIPHER_SERVER_WRITE (SSL3_CC_SERVER | SSL3_CC_WRITE)
epoch = dtls1_get_epoch(s, SSL3_CC_WRITE); /* new epoch */
if (((which & SSL3_CC_CLIENT) && (which & SSL3_CC_WRITE))
if ((which & SSL3_CC_WRITE) != 0) {