/usr/share/go-1.8/src/crypto/aes/ is in golang-1.8-src 1.8.3-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/go-1.8/src/crypto/aes/aes_gcm.go
/usr/share/go-1.8/src/crypto/aes/aes_test.go
/usr/share/go-1.8/src/crypto/aes/asm_amd64.s
/usr/share/go-1.8/src/crypto/aes/asm_s390x.s
/usr/share/go-1.8/src/crypto/aes/block.go
/usr/share/go-1.8/src/crypto/aes/cbc_s390x.go
/usr/share/go-1.8/src/crypto/aes/cipher.go
/usr/share/go-1.8/src/crypto/aes/cipher_amd64.go
/usr/share/go-1.8/src/crypto/aes/cipher_generic.go
/usr/share/go-1.8/src/crypto/aes/cipher_s390x.go
/usr/share/go-1.8/src/crypto/aes/const.go
/usr/share/go-1.8/src/crypto/aes/ctr_s390x.go
/usr/share/go-1.8/src/crypto/aes/gcm_amd64.s
/usr/share/go-1.8/src/crypto/aes/gcm_s390x.go
/usr/share/go-1.8/src/crypto/aes/modes.go
/usr/share/go-1.8/src/crypto/aes/modes_test.go