update package level comments

padding/ansi_x923.go

@@ -1,4 +1,3 @@
-// https://www.ibm.com/docs/en/linux-on-systems?topic=processes-ansi-x923-cipher-block-chaining
 package padding
 
 import (
@@ -7,6 +6,7 @@ import (
 	"github.com/emmansun/gmsm/internal/subtle"
 )
 
+// https://www.ibm.com/docs/en/linux-on-systems?topic=processes-ansi-x923-cipher-block-chaining
 type ansiX923Padding uint
 
 func (pad ansiX923Padding) BlockSize() int {

padding/pkcs7.go

@@ -1,4 +1,4 @@
-// https://datatracker.ietf.org/doc/html/rfc5652#section-6.3
+// Package padding handle padding octets at the trailing end
 package padding
 
 import (
@@ -7,6 +7,7 @@ import (
 	"github.com/emmansun/gmsm/internal/subtle"
 )
 
+// https://datatracker.ietf.org/doc/html/rfc5652#section-6.3
 type pkcs7Padding uint
 
 func (pad pkcs7Padding) BlockSize() int {

rc5/cipher.go

@@ -1,3 +1,4 @@
+// Package rc5 handle rc5 symmetric encryption algorithm
 package rc5
 
 import (

sm2/sm2.go

@@ -1,3 +1,4 @@
+// Package sm2 handle shangmi sm2 algorithm and its curve implementation
 package sm2
 
 // Further references:

sm3/sm3.go

@@ -1,3 +1,4 @@
+// Package sm3 handle shangmi sm3 hash algorithm
 package sm3
 
 // [GM/T] SM3 GB/T 32905-2016

sm4/cipher.go

@@ -1,3 +1,4 @@
+// Package sm4 handle shangmi sm4 symmetric encryption algorithm
 package sm4
 
 import (

zuc/core.go

@@ -1,3 +1,4 @@
+// Package zuc handle shangmi zuc stream cipher
 package zuc
 
 import (