今天找到肖大前段时间推荐的一个链接，关于Android的一个apk，详见：
import java.io.IOException;
import java.util.Scanner;
//xbalien 78388
public class Challenge1Verifier {
public static void main(String[] args) throws IOException{
Scanner in = new Scanner(System.in);
String userName = in.next();
key(userName);
}
public static void key(String paramString1){
int i = 0;
for (int j = 0; j < paramString1.length(); j++){
int m = paramString1.charAt(j);
i = m ^ i + m * m;
}
System.out.println(i);
}
}
import java.io.IOException;
import java.util.Scanner;
//xbalien AIECIE
public class Challenge2Verifier {
public static void main(String[] args) throws IOException{
Scanner in = new Scanner(System.in);
String userName = in.next();
key(userName);
}
public static void key(String paramString1)
{
if (paramString1.length() >= 4){
String str1 = paramString1.toUpperCase();
long l = 0L;
for (int i = 0; i < str1.length(); i++)
l = 3L * (l + str1.charAt(i)) - 64L;
String str2 = Long.toString(l);
System.out.println(str2);
byte keyByte[] = new byte[str2.length()];
for (int k = 0; k < str2.length(); k++){
keyByte[k] = (byte) (str2.charAt(k) + 16);
}
System.out.println(new String(keyByte));
}
}
}
CODE:00002880 Method 68 (0x44):
CODE:00002880 public boolean
CODE:00002880 com.me.keygen.verifiers.challenge.Challenge3Verifier.isValid(
CODE:00002880 java.lang.String p0,
CODE:00002880 java.lang.String p1)
CODE:00002880 this = v12
CODE:00002880 p0 = v13
CODE:00002880 p1 = v14
CODE:00002880 const/16 v11, 0x30
CODE:00002884 const/4 v8, 0
CODE:00002886 const-string v9, asc_3BC2 # "-"
CODE:0000288A invoke-virtual {p1, v9}, <ref String.split(ref) imp. @ _def_String_split@LL> # ;输入的序列号需要有-作为分隔符
CODE:00002890 move-result-object v5 # ;分割后的每一段存放在v5
CODE:00002892 array-length v9, v5
CODE:00002894 const/16 v10, 8
CODE:00002898 if-eq v9, v10, loc_289E # ；前提必须有8段，7个-的输入序列才能通过
CODE:0000289C
CODE:0000289C locret: # CODE XREF: Challenge3Verifier_isValid@ZLL+36j
CODE:0000289C # Challenge3Verifier_isValid@ZLL+F0j ...
CODE:0000289C return v8
CODE:0000289E # ---------------------------------------------------------------------------
CODE:0000289E
CODE:0000289E loc_289E: # CODE XREF: Challenge3Verifier_isValid@ZLL+18j
CODE:0000289E const/4 v7, 0
CODE:000028A0
CODE:000028A0 loc_28A0: # CODE XREF: Challenge3Verifier_isValid@ZLL+3Ej
CODE:000028A0 array-length v9, v5
CODE:000028A2 if-ge v7, v9, loc_28C0
CODE:000028A6 aget-object v9, v5, v7
CODE:000028AA const-string v10, a09aF09aF09aF09 # "[0-9A-F][0-9A-F][0-9A-F][0-9A-F]"
CODE:000028AE invoke-virtual {v9, v10}, <boolean String.matches(ref) imp. @ _def_String_matches@ZL> # ;匹配正则表达式（每一段为4个，且要满足）
CODE:000028B4 move-result v9
CODE:000028B6 if-eqz v9, locret
CODE:000028BA add-int/lit8 v7, v7, 1
CODE:000028BE goto loc_28A0
CODE:000028C0 # ---------------------------------------------------------------------------
CODE:000028C0
CODE:000028C0 loc_28C0: # CODE XREF: Challenge3Verifier_isValid@ZLL+22j
CODE:000028C0 new-instance v0, <t: ByteArrayOutputStream>
CODE:000028C4 invoke-direct {v0}, <void ByteArrayOutputStream.<init>() imp. @ _def_ByteArrayOutputStream__init_@V> # ;新建字节数组输出流
CODE:000028CA const/16 v9, 0x31
CODE:000028CE invoke-virtual {v0, v9}, <void ByteArrayOutputStream.write(int) imp. @ _def_ByteArrayOutputStream_write@VI> # ;49写入字节数组流中
CODE:000028D4 const/4 v7, 0
CODE:000028D6
CODE:000028D6 loc_28D6: # CODE XREF: Challenge3Verifier_isValid@ZLL+7Cj
CODE:000028D6 iget-object v9, this, Challenge3Verifier_secretBytes # ;取出关键运算值，secretBytes，进行适当的算法，写入字节数组流
CODE:000028DA array-length v9, v9
CODE:000028DC if-ge v7, v9, loc_28FE
CODE:000028E0 iget-object v9, this, Challenge3Verifier_secretBytes
CODE:000028E4 aget-byte v9, v9, v7
CODE:000028E8 invoke-virtual {v0, v9}, <void ByteArrayOutputStream.write(int) imp. @ _def_ByteArrayOutputStream_write@VI>
CODE:000028EE add-int/lit8 v9, v7, 1
CODE:000028F2 invoke-virtual {v0, v9}, <void ByteArrayOutputStream.write(int) imp. @ _def_ByteArrayOutputStream_write@VI>
CODE:000028F8 add-int/lit8 v7, v7, 2
CODE:000028FC goto loc_28D6 # ;取出关键运算值，secretBytes，进行适当的算法，写入字节数组流
CODE:000028FE # ---------------------------------------------------------------------------
CODE:000028FE
CODE:000028FE loc_28FE: # CODE XREF: Challenge3Verifier_isValid@ZLL+5Cj
CODE:000028FE const/4 v7, 1
CODE:00002900
CODE:00002900 loc_2900: # CODE XREF: Challenge3Verifier_isValid@ZLL+A6j
CODE:00002900 iget-object v9, this, Challenge3Verifier_secretBytes # ;再次取出关键运算值，secretBytes，进行适当的算法，写入字节数组流
CODE:00002904 array-length v9, v9
CODE:00002906 if-ge v7, v9, loc_2928
CODE:0000290A iget-object v9, this, Challenge3Verifier_secretBytes
CODE:0000290E aget-byte v9, v9, v7
CODE:00002912 invoke-virtual {v0, v9}, <void ByteArrayOutputStream.write(int) imp. @ _def_ByteArrayOutputStream_write@VI>
CODE:00002918 add-int/lit8 v9, v7, 1
CODE:0000291C invoke-virtual {v0, v9}, <void ByteArrayOutputStream.write(int) imp. @ _def_ByteArrayOutputStream_write@VI>
CODE:00002922 add-int/lit8 v7, v7, 2
CODE:00002926 goto loc_2900 # ;再次取出关键运算值，secretBytes，进行适当的算法，写入字节数组流
CODE:00002928 # ---------------------------------------------------------------------------
CODE:00002928
CODE:00002928 loc_2928: # CODE XREF: Challenge3Verifier_isValid@ZLL+86j
CODE:00002928 invoke-virtual {v0, v11}, <void ByteArrayOutputStream.write(int) imp. @ _def_ByteArrayOutputStream_write@VI>
CODE:0000292E invoke-virtual {v0, v11}, <void ByteArrayOutputStream.write(int) imp. @ _def_ByteArrayOutputStream_write@VI> # ;写入两个48
CODE:00002934 const/4 v7, 0
CODE:00002936
CODE:00002936 loc_2936: # CODE XREF: Challenge3Verifier_isValid@ZLL+ECj
CODE:00002936 array-length v9, v5 # ;取出输入序列中的前4段xxxx-xxxx-xxxx-xxxx-写入字节数组流
CODE:00002938 div-int/lit8 v9, v9, 2
CODE:0000293C if-ge v7, v9, loc_2972
CODE:00002940 # try 0x2940-0x2968:
CODE:00002940 aget-object v9, v5, v7
CODE:00002944 const-string v10, aUs_ascii # "US_ASCII"
CODE:00002948 invoke-static {v10}, <ref Charset.forName(ref) imp. @ _def_Charset_forName@LL>
CODE:0000294E move-result-object v10
CODE:00002950 invoke-virtual {v9, v10}, <ref String.getBytes(ref) imp. @ _def_String_getBytes@LL>
CODE:00002956 move-result-object v9
CODE:00002958 invoke-virtual {v0, v9}, <void ByteArrayOutputStream.write(ref) imp. @ _def_ByteArrayOutputStream_write@VL>
CODE:0000295E const/16 v9, 0x2D
CODE:00002962 invoke-virtual {v0, v9}, <void ByteArrayOutputStream.write(int) imp. @ _def_ByteArrayOutputStream_write@VI>
CODE:00002968 add-int/lit8 v7, v7, 1
CODE:0000296C goto loc_2936 # ;取出输入序列中的前4段xxxx-xxxx-xxxx-xxxx-写入字节数组流
CODE:0000296E # ---------------------------------------------------------------------------
CODE:0000296E # catch Exception:
CODE:0000296E move-exception v1
CODE:00002970 goto locret
CODE:00002972 # ---------------------------------------------------------------------------
CODE:00002972 # try 0x2972-0x297C:
CODE:00002972
CODE:00002972 loc_2972: # CODE XREF: Challenge3Verifier_isValid@ZLL+BCj
CODE:00002972 iget-object v9, this, Challenge3Verifier_secretBytes
CODE:00002976 invoke-virtual {v0, v9}, <void ByteArrayOutputStream.write(ref) imp. @ _def_ByteArrayOutputStream_write@VL>
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