/usr/share/gocode/src/golang.org/x/crypto/pkcs12/ is in golang-golang-x-crypto-dev 1:0.0~git20170629.0.5ef0053-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gocode/src/golang.org/x/crypto/pkcs12/bmp-string.go
/usr/share/gocode/src/golang.org/x/crypto/pkcs12/bmp-string_test.go
/usr/share/gocode/src/golang.org/x/crypto/pkcs12/crypto.go
/usr/share/gocode/src/golang.org/x/crypto/pkcs12/crypto_test.go
/usr/share/gocode/src/golang.org/x/crypto/pkcs12/errors.go
/usr/share/gocode/src/golang.org/x/crypto/pkcs12/internal/
/usr/share/gocode/src/golang.org/x/crypto/pkcs12/internal/rc2/
/usr/share/gocode/src/golang.org/x/crypto/pkcs12/internal/rc2/bench_test.go
/usr/share/gocode/src/golang.org/x/crypto/pkcs12/internal/rc2/rc2.go
/usr/share/gocode/src/golang.org/x/crypto/pkcs12/internal/rc2/rc2_test.go
/usr/share/gocode/src/golang.org/x/crypto/pkcs12/mac.go
/usr/share/gocode/src/golang.org/x/crypto/pkcs12/mac_test.go
/usr/share/gocode/src/golang.org/x/crypto/pkcs12/pbkdf.go
/usr/share/gocode/src/golang.org/x/crypto/pkcs12/pbkdf_test.go
/usr/share/gocode/src/golang.org/x/crypto/pkcs12/pkcs12.go
/usr/share/gocode/src/golang.org/x/crypto/pkcs12/pkcs12_test.go
/usr/share/gocode/src/golang.org/x/crypto/pkcs12/safebags.go