/usr/include/heimdal/hcrypto/ is in heimdal-multidev 7.5.0+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/heimdal/hcrypto/aes.h
/usr/include/heimdal/hcrypto/bn.h
/usr/include/heimdal/hcrypto/des.h
/usr/include/heimdal/hcrypto/dh.h
/usr/include/heimdal/hcrypto/dsa.h
/usr/include/heimdal/hcrypto/ec.h
/usr/include/heimdal/hcrypto/ecdh.h
/usr/include/heimdal/hcrypto/ecdsa.h
/usr/include/heimdal/hcrypto/engine.h
/usr/include/heimdal/hcrypto/evp-cc.h
/usr/include/heimdal/hcrypto/evp-hcrypto.h
/usr/include/heimdal/hcrypto/evp-openssl.h
/usr/include/heimdal/hcrypto/evp-pkcs11.h
/usr/include/heimdal/hcrypto/evp.h
/usr/include/heimdal/hcrypto/hmac.h
/usr/include/heimdal/hcrypto/md2.h
/usr/include/heimdal/hcrypto/md4.h
/usr/include/heimdal/hcrypto/md5.h
/usr/include/heimdal/hcrypto/pkcs12.h
/usr/include/heimdal/hcrypto/rand.h
/usr/include/heimdal/hcrypto/rc2.h
/usr/include/heimdal/hcrypto/rc4.h
/usr/include/heimdal/hcrypto/rsa.h
/usr/include/heimdal/hcrypto/sha.h
/usr/include/heimdal/hcrypto/ui.h
/usr/include/heimdal/hcrypto/undef.h