+ unprepend
+ v hbv
+ length int
+ => hb
+ unappend
+ v hbv
+ length int
+ => hb
+ chopto
+ v hbv
+ length int
+ => hb
+ pkcs5
+ meth enum(PadMethod, "hbytes pad subcommand")
+ obj ...
+# blockcipher
+# encrypt charfrom("de","encrypt/decrypt")
+# v hbv
+# alg enum(BlockCipherAlgInfo, "alg")
+# mode enum(BlockCipherModeInfo, "mode")
+# ?iv hb
+# => hb
+# hash
+# alg enum(HashAlgInfo, "hash alg")
+# message hb
+# => hb
+# hmac
+# alg enum(HashAlgInfo, "hash alg for hmac")
+# message hb
+# key hb
+# maclen int
+# => hb
+
+Table padmethod PadMethod
+ pa 1