根据smali代码和反编译出的java代码反推出更容易理解的java代码

已知一段smali代码如下：

.method public static c(Ljava/lang/String;)Ljava/lang/String;
    .locals 10

    const/4 v7, 0x0

    if-nez p0, :cond_0

    move-object v6, v7

    :goto_0
    return-object v6

    :cond_0
    :try_start_0
    new-instance v8, La/auu/a;

    invoke-direct {v8}, La/auu/a;-><init>()V

    const/4 v9, 0x0

    invoke-virtual {v8, p0, v9}, La/auu/a;->ooo0ooo0o0o000o(Ljava/lang/String;I)[B

    move-result-object v0

    array-length v5, v0

    const/4 v4, 0x7

    new-array v1, v4, [B

    fill-array-data v1, :array_0

    const/4 v2, 0x0

    const/4 v3, 0x0

    :goto_1
    if-lt v2, v5, :cond_1

    new-instance v6, Ljava/lang/String;

    invoke-direct {v6, v0}, Ljava/lang/String;-><init>([B)V

    goto :goto_0

    :cond_1
    if-lt v3, v4, :cond_2

    const/4 v3, 0x0

    :cond_2
    aget-byte v8, v0, v2

    aget-byte v9, v1, v3

    xor-int/2addr v8, v9

    int-to-byte v8, v8

    aput-byte v8, v0, v2
    :try_end_0
    .catch Ljava/lang/Exception; {:try_start_0 .. :try_end_0} :catch_0

    add-int/lit8 v2, v2, 0x1

    add-int/lit8 v3, v3, 0x1

    goto :goto_1

    :catch_0
    move-exception v1

    move-object v6, v7

    goto :goto_0

    nop

    :array_0
    .array-data 1
        0x4et
        0x65t
        0x74t
        0x65t
        0x61t
        0x73t
        0x65t
    .end array-data
.end method

使用dex2jar得到的java代码是这样的：

 public static String c(String paramString)
  {
    if (paramString == null) {
      return null;
    }
    for (;;)
    {
      try
      {
        paramString = new a().ooo0ooo0o0o000o(paramString, 0);
        int m = paramString.length;
        j = 0;
        i = 0;
        if (j < m) {
          break label106;
        }
        return new String(paramString);
      }
      catch (Exception paramString)
      {
        int j;
        return null;
      }
      paramString[j] = ((byte)(paramString[j] ^ new byte[] { 78, 101, 116, 101, 97, 115, 101 }[k]));
      j += 1;
      int i = k + 1;
      continue;
      label106:
      int k = i;
      if (i >= 7) {
        k = 0;
      }
    }
  }

根据smali代码修正后的java代码

  public static String c(String paramString)
  {
    if (paramString == null) {
      return null;
    }
      try
      {
        paramString = new a().ooo0ooo0o0o000o(paramString, 0);
        int m = paramString.length;
          for(j = 0, k = 0; j < m; j++, k++){
              if(k < 7){
                  paramString[j] = ((byte)(paramString[j] ^ new byte[] { 78, 101, 116, 101, 97, 115, 101 }[k]));
                }
                k = 0;
          }
          return new String(paramString);
      }

      catch (Exception paramString)
      {
        return null;
      }
  }