crypto: add import comments.

Change-Id: I33240faf1b8620d0cd600de661928d8e422ebdbc
Reviewed-on: https://go-review.googlesource.com/1235
Reviewed-by: Andrew Gerrand <adg@golang.org>

openpgp/armor/armor.go

@@ -4,7 +4,7 @@
 
 // Package armor implements OpenPGP ASCII Armor, see RFC 4880. OpenPGP Armor is
 // very similar to PEM except that it has an additional CRC checksum.
-package armor
+package armor // import "golang.org/x/crypto/openpgp/armor"
 
 import (
 	"bufio"

openpgp/clearsign/clearsign.go

@@ -7,7 +7,7 @@
 //
 // Clearsigned messages are cryptographically signed, but the contents of the
 // message are kept in plaintext so that it can be read without special tools.
-package clearsign
+package clearsign // import "golang.org/x/crypto/openpgp/clearsign"
 
 import (
 	"bufio"

openpgp/elgamal/elgamal.go

@@ -10,7 +10,7 @@
 // This form of ElGamal embeds PKCS#1 v1.5 padding, which may make it
 // unsuitable for other protocols. RSA should be used in preference in any
 // case.
-package elgamal
+package elgamal // import "golang.org/x/crypto/openpgp/elgamal"
 
 import (
 	"crypto/rand"

openpgp/errors/errors.go

@@ -3,7 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // Package errors contains common error types for the OpenPGP packages.
-package errors
+package errors // import "golang.org/x/crypto/openpgp/errors"
 
 import (
 	"strconv"

openpgp/packet/packet.go

@@ -4,7 +4,7 @@
 
 // Package packet implements parsing and serialization of OpenPGP packets, as
 // specified in RFC 4880.
-package packet
+package packet // import "golang.org/x/crypto/openpgp/packet"
 
 import (
 	"bufio"

openpgp/read.go

@@ -3,7 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // Package openpgp implements high level operations on OpenPGP messages.
-package openpgp
+package openpgp // import "golang.org/x/crypto/openpgp"
 
 import (
 	"crypto"

openpgp/s2k/s2k.go

@@ -4,7 +4,7 @@
 
 // Package s2k implements the various OpenPGP string-to-key transforms as
 // specified in RFC 4800 section 3.7.1.
-package s2k
+package s2k // import "golang.org/x/crypto/openpgp/s2k"
 
 import (
 	"crypto"