Golang AES algorithm for interoperability with Java (Android)

This is a creation in Article, where the information may have evolved or changed.

Because the Java AES256 Encryption Library is Export-restricted, AES 128 encryption is used only.

Requirements to be met by interoperability

• Number of encryption bits: Unified mining AES 128
• Group encryption Condition: cbc/pkcs#5padding
• Key fills the same way

Because Android's default padding is not the same as the Java default, and in different JDK versions there will be a key fill inconsistency, so you manually fill, go also take the same as Java fill: 16 bit 0. AES two platforms are to implement AES encryption and decryption operations. The encryption results are turned into base64.

The key code is as follows:
Go

Populates the Func Paddingkey (key String) (string) {var buffer bytes. Buffer buffer. WriteString (key) for I:=len (key); i<16;i++{buffer. WriteString ("0")} return buffer. String ()}//cryptographic func En (src string,srckey string) (string) {key: = []byte (Paddingkey (srckey)) result, err: = Aesencrypt ( []byte (SRC), key) if err! = Nil {panic (err)} return base64. Stdencoding.encodetostring (Result)}//decrypt func Unen (src string,srckey string) (string) {key: = []byte (Paddingkey (Srckey) var result []byte var err error result,err=base64. Stdencoding.decodestring (SRC) if err! = Nil {panic (err)} origdata, err: = Aesdecrypt (result, key) if Err! = Nil {panic (Err)} return string (Origdata)}func aesencrypt (Origdata, key []byte,iv []byte] ([]byte, er ROR) {block, err: = AES. Newcipher (key) if err! = Nil {return nil, err} blockSize: = block. BlockSize () Origdata = pkcs5padding (Origdata, BlockSize)//Origdata = ZEropadding (Origdata, block. BlockSize ()) Blockmode: = cipher. Newcbcencrypter (block, iv[:blocksize]) crypted: = Make ([]byte, Len (origdata))//According to the Cryptblocks method, initialize crypted as described below or To//crypted: = Origdata blockmode.cryptblocks (crypted, Origdata) return crypted, Nil}func aesdecrypt (crypted, ke y []byte,iv []byte] ([]byte, error) {block, err: = AES. Newcipher (key) if err! = Nil {return nil, err} blockSize: = block. BlockSize () Blockmode: = cipher. Newcbcdecrypter (Block,iv[:blocksize]) Origdata: = Make ([]byte, Len (crypted))//Origdata: = crypted blockmode.cry Ptblocks (Origdata, crypted) Origdata = pkcs5unpadding (origdata)//Origdata = zerounpadding (origdata) return orig     Data, Nil}func pkcs5padding (ciphertext []byte, blockSize int) []byte {padding: = Blocksize-len (ciphertext)%blocksize Padtext: = bytes. Repeat ([]byte{byte (padding)}, padding) return append (ciphertext, padtext ...)}   Func pkcs5unpadding (Origdata []byte) []byte { Length: = Len (origdata)//Remove Last byte unpadding times unpadding: = Int (origdata[length-1]) return origdata[:(length- unpadding)]}

Java:

public class Aestool {private Ivparameterspec ivspec;    Private Secretkeyspec KeySpec;        Public Aestool (String srckey) {string Key=paddingkey (Srckey);            try {byte[] keybytes = Key.getbytes ();            byte[] buf = new BYTE[16];            for (int i = 0; i < keybytes.length && i < buf.length; i++) {buf[i] = keybytes[i];            } This.keyspec = new Secretkeyspec (buf, "AES");        This.ivspec = new Ivparameterspec (keybytes);        } catch (Exception e) {e.printstacktrace ();            }} public String Encrypt (string src) {try {byte[] origdata=src.getbytes ();            Cipher Cipher = cipher.getinstance ("aes/cbc/pkcs5padding");            Cipher.init (Cipher.encrypt_mode, This.keyspec, This.ivspec);            Byte[] re= cipher.dofinal (origdata);        Return base64.encodetostring (Re,base64.default);   } catch (Exception e) {e.printstacktrace ();     } return null;            public string Decrypt (string src) throws Exception {byte[] Crypted=base64.decode (Src,base64.default);            Cipher Cipher = cipher.getinstance ("aes/cbc/pkcs5padding");            Cipher.init (Cipher.decrypt_mode, This.keyspec, This.ivspec);            BYTE re[] =cipher.dofinal (crypted);    return new String (re);        } private static String Paddingkey (String Liu) {stringbuffer sb=new stringbuffer (Liu);        for (int i=liu.length (); i<16;i++) {Sb.append ("0");    } return sb.tostring (); }}