PF_MD5_DIGEST_LENGTH
char buf[PF_MD5_DIGEST_LENGTH * 2 + 1];
for (i = 0; i < PF_MD5_DIGEST_LENGTH; i++) {
u_int8_t pfcksum[PF_MD5_DIGEST_LENGTH];
u_int8_t digest[PF_MD5_DIGEST_LENGTH];
u_int8_t pf_chksum[PF_MD5_DIGEST_LENGTH];
#if PF_MD5_DIGEST_LENGTH != MD5_DIGEST_LENGTH