/usr/include/hcrypto/ is in heimdal-dev 1.6~git20120311.dfsg.1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/hcrypto/aes.h
/usr/include/hcrypto/bn.h
/usr/include/hcrypto/des.h
/usr/include/hcrypto/dh.h
/usr/include/hcrypto/dsa.h
/usr/include/hcrypto/ec.h
/usr/include/hcrypto/ecdh.h
/usr/include/hcrypto/ecdsa.h
/usr/include/hcrypto/engine.h
/usr/include/hcrypto/evp-cc.h
/usr/include/hcrypto/evp-hcrypto.h
/usr/include/hcrypto/evp.h
/usr/include/hcrypto/hmac.h
/usr/include/hcrypto/md2.h
/usr/include/hcrypto/md4.h
/usr/include/hcrypto/md5.h
/usr/include/hcrypto/pkcs12.h
/usr/include/hcrypto/rand.h
/usr/include/hcrypto/rc2.h
/usr/include/hcrypto/rc4.h
/usr/include/hcrypto/rsa.h
/usr/include/hcrypto/sha.h
/usr/include/hcrypto/ui.h