Android加密策略

public class SHA1Util {
     private static final boolean hexcase = false;
     private static final String b64pad = "=";
     private static final int chrsz = 8;
     // 得到字符串SHA-1值的方法
    public static String hex_sha1(String s) {
         s = (s == null) ? "" : s;
         return binb2hex(core_sha1(str2binb(s), s.length() * chrsz));
     }
     public static String b64_hmac_sha1(String key, String data) {
         return binb2b64(core_hmac_sha1(key, data));
     }
     public static String b64_sha1(String s) {
         s = (s == null) ? "" : s;
         return binb2b64(core_sha1(str2binb(s), s.length() * chrsz));
     }
     private static String binb2b64(int[] binarray) {
         String tab = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789+/";
         String str = "";
         binarray = strechbinarray(binarray, binarray.length * 4);
         for (int i = 0; i < binarray.length * 4; i += 3) {
             int triplet = (((binarray[i >> 2] >> 8 * (3 - i % 4)) & 0xff) << 16)
                     | (((binarray[i + 1 >> 2] >> 8 * (3 - (i + 1) % 4)) & 0xff) << 8)
                     | ((binarray[i + 2 >> 2] >> 8 * (3 - (i + 2) % 4)) & 0xff);
             for (int j = 0; j < 4; j++) {
                 if (i * 8 + j * 6 > binarray.length * 32) {
                     str += b64pad;
                 } else {
                     str += tab.charAt((triplet >> 6 * (3 - j)) & 0x3f);
                 }
             }
         }
         return cleanb64str(str);
     }
     private static String binb2hex(int[] binarray) {
         String hex_tab = hexcase ? "0123456789abcdef" : "0123456789abcdef";
         String str = "";
         for (int i = 0; i < binarray.length * 4; i++) {
             char a = (char) hex_tab.charAt((binarray[i >> 2] >> ((3 - i % 4) * 8 + 4)) & 0xf);
             char b = (char) hex_tab.charAt((binarray[i >> 2] >> ((3 - i % 4) * 8)) & 0xf);
             str += (new Character(a).toString() + new Character(b).toString());
         }
         return str;
     }
     private static String binb2str(int[] bin) {
         String str = "";
         int mask = (1 << chrsz) - 1;
         for (int i = 0; i < bin.length * 32; i += chrsz) {
             str += (char) ((bin[i >> 5] >>> (24 - i % 32)) & mask);
         }
         return str;
     }
     private static int bit_rol(int num, int cnt) {
         return (num << cnt) | (num >>> (32 - cnt));
     }
     private static String cleanb64str(String str) {
         str = (str == null) ? "" : str;
         int len = str.length();
         if (len <= 1) {
             return str;
         }
         char trailchar = str.charAt(len - 1);
         String trailstr = "";
         for (int i = len - 1; i >= 0 && str.charAt(i) == trailchar; i--) {
             trailstr += str.charAt(i);
         }
         return str.substring(0, str.indexOf(trailstr));
     }
     private static int[] complete216(int[] oldbin) {
         if (oldbin.length >= 16) {
             return oldbin;
         }
         int[] newbin = new int[16 - oldbin.length];
         for (int i = 0; i < newbin.length; newbin[i] = 0, i++)
             ;
         return concat(oldbin, newbin);
     }
     private static int[] concat(int[] oldbin, int[] newbin) {
         int[] retval = new int[oldbin.length + newbin.length];
         for (int i = 0; i < (oldbin.length + newbin.length); i++) {
             if (i < oldbin.length) {
                 retval[i] = oldbin[i];
             } else {
                 retval[i] = newbin[i - oldbin.length];
             }
         }
         return retval;
     }
     private static int[] core_hmac_sha1(String key, String data) {
         key = (key == null) ? "" : key;
         data = (data == null) ? "" : data;
         int[] bkey = complete216(str2binb(key));
         if (bkey.length > 16) {
             bkey = core_sha1(bkey, key.length() * chrsz);
         }
         int[] ipad = new int[16];
         int[] opad = new int[16];
         for (int i = 0; i < 16; ipad[i] = 0, opad[i] = 0, i++)
             ;
         for (int i = 0; i < 16; i++) {
             ipad[i] = bkey[i] ^ 0x36363636;
             opad[i] = bkey[i] ^ 0x5c5c5c5c;
         }
         int[] hash = core_sha1(concat(ipad, str2binb(data)), 512 + data.length() * chrsz);
         return core_sha1(concat(opad, hash), 512 + 160);
     }
     private static int[] core_sha1(int[] x, int len) {
         int size = (len >> 5);
         x = strechbinarray(x, size);
         x[len >> 5] |= 0x80 << (24 - len % 32);
         size = ((len + 64 >> 9) << 4) + 15;
         x = strechbinarray(x, size);
         x[((len + 64 >> 9) << 4) + 15] = len;
         int[] w = new int[80];
         int a = 1732584193;
         int b = -271733879;
         int c = -1732584194;
         int d = 271733878;
         int e = -1009589776;
         for (int i = 0; i < x.length; i += 16) {
             int olda = a;
             int oldb = b;
             int oldc = c;
             int oldd = d;
             int olde = e;
             for (int j = 0; j < 80; j++) {
                 if (j < 16) {
                     w[j] = x[i + j];
                 } else {
                     w[j] = rol(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1);
                 }
                 int t = safe_add(safe_add(rol(a, 5), sha1_ft(j, b, c, d)), safe_add(safe_add(e, w[j]), sha1_kt(j)));
                 e = d;
                 d = c;
                 c = rol(b, 30);
                 b = a;
                 a = t;
             }
             a = safe_add(a, olda);
             b = safe_add(b, oldb);
             c = safe_add(c, oldc);
             d = safe_add(d, oldd);
             e = safe_add(e, olde);
         }
         int[] retval = new int[5];
         retval[0] = a;
         retval[1] = b;
         retval[2] = c;
         retval[3] = d;
         retval[4] = e;
         return retval;
     }
     private static void dotest() {
         String key = "key";
         String data = "data";
         System.out.println("hex_sha1(" + data + ")=" + hex_sha1(data));
         System.out.println("b64_sha1(" + data + ")=" + b64_sha1(data));
         System.out.println("str_sha1(" + data + ")=" + str_sha1(data));
         System.out.println("hex_hmac_sha1(" + key + "," + data + ")=" + hex_hmac_sha1(key, data));
         System.out.println("b64_hmac_sha1(" + key + "," + data + ")=" + b64_hmac_sha1(key, data));
         System.out.println("str_hmac_sha1(" + key + "," + data + ")=" + str_hmac_sha1(key, data));
     }
     public static String hex_hmac_sha1(String key, String data) {
         return binb2hex(core_hmac_sha1(key, data));
     }
     private static int rol(int num, int cnt) {
         return (num << cnt) | (num >>> (32 - cnt));
     }
     private static int safe_add(int x, int y) {
         int lsw = (int) (x & 0xffff) + (int) (y & 0xffff);
         int msw = (x >> 16) + (y >> 16) + (lsw >> 16);
         return (msw << 16) | (lsw & 0xffff);
     }
     private static int sha1_ft(int t, int b, int c, int d) {
         if (t < 20)
             return (b & c) | ((~b) & d);
         if (t < 40)
             return b ^ c ^ d;
         if (t < 60)
             return (b & c) | (b & d) | (c & d);
         return b ^ c ^ d;
     }
     private static int sha1_kt(int t) {
         return (t < 20) ? 1518500249 : (t < 40) ? 1859775393 : (t < 60) ? -1894007588 : -899497514;
     }
     private static boolean sha1_vm_test() {
         return hexcase ? hex_sha1("abc").equals("a9993e364706816aba3e25717850c26c9cd0d89d") : hex_sha1("abc").equals(
                 "a9993e364706816aba3e25717850c26c9cd0d89d");
     }
     public static String str_hmac_sha1(String key, String data) {
         return binb2str(core_hmac_sha1(key, data));
     }
     public static String str_sha1(String s) {
         s = (s == null) ? "" : s;
         return binb2str(core_sha1(str2binb(s), s.length() * chrsz));
     }
     private static int[] str2binb(String str) {
         str = (str == null) ? "" : str;
         int[] tmp = new int[str.length() * chrsz];
         int mask = (1 << chrsz) - 1;
         for (int i = 0; i < str.length() * chrsz; i += chrsz) {
             tmp[i >> 5] |= ((int) (str.charAt(i / chrsz)) & mask) << (24 - i % 32);
         }
         int len = 0;
         for (int i = 0; i < tmp.length && tmp[i] != 0; i++, len++)
             ;
         int[] bin = new int[len];
         for (int i = 0; i < len; i++) {
             bin[i] = tmp[i];
         }
         return bin;
     }
     private static int[] strechbinarray(int[] oldbin, int size) {
         int currlen = oldbin.length;
         if (currlen >= size + 1) {
             return oldbin;
         }
         int[] newbin = new int[size + 1];
         for (int i = 0; i < size; newbin[i] = 0, i++)
             ;
         for (int i = 0; i < currlen; i++) {
             newbin[i] = oldbin[i];
         }
         return newbin;
     }
     public static void main(String args[]) {
         System.out.println("admin的SHA1的值为：" + hex_sha1("admin") + ",length=" + hex_sha1("admin").length());
     }
 }

了解AES：

<span style="font-weight: normal;">//模板类模板类写好了再按思路写个实现就可以了
publicinterfaceBase64{
/**
*根据传进来的字符的字节码，查询base64码表的索引，并返回所查到的索引
*
*@paramb一个编码后的字节码
*@return返回base64码表的索引
*/
publicabstractbytebaseIndex(byteb);
/**
*解码的方法
*传进来的是编码后的base64字符的字节码
*解析时是4个一组进行解析
*@paramb编码后的字符的字节码数组
*@return返回原来的字符串
*/
publicabstractStringbackEncode(byte[]b);
/**
*解码
*将4个字节码中的第1个的后6位（00xxxxxx）和第2个
*字节的前4位的后2位（00yy0000）
*还原为原来的字节码（xxxxxxyy）
*
*@paramfirst4个字节码中的第1个
*@paramsecond4个字节码中的第2个
*@return原来的字符的字节码
*/publicabstractbytebackFirst(bytefirst,bytesecond);
/**
*解码
*将4个字节码中的第2个的后4位（0000xxxx）和第3个
*字节的前6位的后4位（00yyyy00）
*还原为原来的字节码（xxxxyyyy）
*@paramsecond4个字节码中的第2个
*@paramthird4个字节码中的第3个
*@return原来的字符的字节码
*/
publicabstractbytebackSecond(bytesecond,bytethird);
/**
*解码
*将4个字节码中的第3个的后2位（000000xx）和第4个
*字节的后6位（00yyyyyy）
*还原为原来的字节码（xxyyyyyy）
*@paramthird传进来的第3个字符
*@paramfourth传进来的第4个字符
*@return原来的字符的字节码
*/publicabstractbytebackThird(bytethird,bytefourth);
/**
*解码
*将编码后的字符串数组的最后2个字节码还原为原来的字节码
*假如数组末尾剩下2个字节：
*将倒数第2个字节的前后6位(00xxxxxx)
*和倒数第一个字节的后2位(000000yy)
*还原为原来的编码（xxxxxxyy）
*假如数组末尾剩下3个字节：
*将倒数第2个字节的前后4位(0000xxxx)
*和倒数第一个字节的后4位(0000yyyy)
*还原为原来的编码（xxxxyyyy）
*@paramlast_b倒数第2个字节
*@paramnext_b倒数第1个字节
*@parammove_l倒数第2个字节移动位数的参数
*@parammove_b倒数第1个字节移动位数的参数
*@return原来的字符的字节码
*/
publicbytebackLastOne(bytelast_b,bytenext_b,intmove_l,intmove_b);
/**
*编码
*将传进来的字符编码为base64，返回一个base64的字符串
*编码时3个字节一组进行编码，传进来的是要进行编码的字符串数组
*@paramb要进行编码的字符串数组
*@return编码后的字符串
*/
publicabstractStringencode(byte[]b);
/**
*假如字符长度%3！=0，使用此方法编码末尾字符
*假如b=xxxxyyyy
*假如末尾字节个数等于1：
*将这个字节的前6位作为一个字节(00xxxxyy)
*将这个字节的后6位作为一个字节(00xxyyyy)
*假如末尾字节个数等于2：
*将这个字节的后6位作为一个字节(00xxyyyy)
*@paramb末尾的字符的字节码
*@parammove末尾的字符的字节码要移动的位数的参数
*@return编码后的字节码
*/
publicabstractbytelastOneByte(byteb,intmove);
/**
*编码
*假如b=xxxxyyyy
*将第1个字节的前6位编码为base64
*将3个字节中的第1个子节码转为（00xxxxyy）
*@paramb3个字节中的第1个字节
*@return编码后的字节码
*/
publicabstractbytefirstByte(byteb);
/**
*编码
*假如last_b=xxxxyyyynext_b=kkkkffff
*将3个字节中的第1个字节的最后2位（000000yy）
*和第2个字节的前4位（kkkk0000）编码为（00yykkkk）
*
*@paramlast_b3个字节中的第1个字节
*@paramnext_b3个字节中的第2个字节
*@return编码后的字节码
*/
publicabstractbytesecondByte(bytelast_b,bytenext_b);
/**
*编码
*假如last_b=xxxxyyyynext_b=kkkkffff
*将3个字节中的第2个字节的最后4位（0000yyyy）
*和第4个字节的前2位（kk000000）编码为（00yyyykk）
*
*
*@paramlast_b3个字节中的第2个字节
*@paramnext_b3个字节中的第3个字节
*@return编码后的字节码
*/
publicabstractbytethirdByte(bytelast_b,bytenext_b);
/**
*编码
*假如b=xxxxyyyy
*将3个字节中的第3个字节的最后6位（00xxyyyy）
*转码为（00xxyyyy）
*@paramb3个字节中的第3个字节
*@return编码后的字节码
*/
publicabstractbytefourthByte(byteb);
}</span>

<span style="font-weight: normal;">importjava.util.Enumeration;
importjava.util.Vector;
publicclassMyBase64EncoderimplementsBase64{
/**
*base64码表
*/
privatestaticfinalbytebase[]={0x41,0x42,0x43,0x44,0x45,0x46,
0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f,0x50,0x51,
0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,0x61,0x62,
0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,
0x6e,0x6f,0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,
0x79,0x7a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,
0x39,0x2b,0x2f};</span>

<span style="font-weight: normal;">@Override
publicbytebaseIndex(byteb){
for(inti=0;i<base.length;i++){
if(base[i]==b){
return(byte)i;
}
}
return-1;
}</span>

<span style="font-weight: normal;">@Override
publicStringbackEncode(byte[]b){
StringBuffersb=newStringBuffer();
Vector<Byte>list=newVector<Byte>();
intreal_len=b.length;
intlen=real_len-2;
intmore_len=len&3;
intuse_len=len-more_len;</span>

<span style="font-weight: normal;">for(inti=0;i<use_len;i+=4){
list.add(backFirst(baseIndex(b[i]),baseIndex(b[i+1])));
list.add(backSecond(baseIndex(b[i+1]),baseIndex(b[i+2])));
list.add(backThird(baseIndex(b[i+2]),baseIndex(b[i+3])));
}
Enumeratione=list.elements();
bytebytes[]=newbyte[list.size()];
intk=-1;
while(e.hasMoreElements()){
bytes[++k]=(Byte)e.nextElement();
}
sb.append(newString(bytes));</span>

<span style="font-weight: normal;">if(more_len==2){
byteb_1[]=newbyte[1];
b_1[0]=backLastOne(baseIndex(b[len-2]),baseIndex(b[len-1]),2,6);
sb.append(newString(b_1));
}
if(more_len==3){
byteb_2[]=newbyte[2];
b_2[0]=backFirst(baseIndex(b[len-3]),baseIndex(b[len-2]));
b_2[1]=backLastOne(baseIndex(b[len-2]),baseIndex(b[len-1]),4,4);
sb.append(newString(b_2));
}
returnsb.toString();
}
@Override
publicbytelastOneByte(byteb,intmove){
intr_b=b&0xff;
r_b=r_b<<move;
r_b=r_b>>>2;
return(byte)(r_b&0x3f);
}
@Override
publicbytebackLastOne(bytelast_b,bytenext_b,intmove_l,intmove_b){
intr_l=last_b&0xff;
intr_n=next_b&0xff;
r_l=r_l<<move_l;
r_n=r_n<<move_b;
r_n=r_n>>>move_b;
return(byte)((r_l|r_n)&0xff);
}
@Override
publicbytebackFirst(bytefirst,bytesecond){
intr_f=first&0xff;
intr_s=second&0xff;
r_f=r_f<<2;
r_s=r_s>>>4;
return(byte)((r_f|r_s)&0xff);
}</span>

<span style="font-weight: normal;">@Override
publicbytebackSecond(bytesecond,bytethird){
intr_s=second&0xff;
intr_t=third&0xff;
r_s=r_s<<4;
r_t=r_t>>>2;
return(byte)((r_s|r_t)&0xff);
}</span>

<span style="font-weight: normal;">@Override
publicbytebackThird(bytethird,bytefourth){
intr_t=third&0xff;
intr_f=fourth&0xff;
r_t=r_t<<6;
return(byte)((r_t|r_f)&0xff);
}</span>

<span style="font-weight: normal;">@Override
publicStringencode(byte[]b){
StringBuffersb=newStringBuffer();
intlen=b.length;
intmore_len=len%3;
intuse_len=len-more_len;
byte[]bytes=newbyte[4];
for(inti=0;i<use_len;i+=3){
bytes[0]=base[firstByte(b[i])];
bytes[1]=base[secondByte(b[i],b[i+1])];
bytes[2]=base[thirdByte(b[i+1],b[i+2])];
bytes[3]=base[fourthByte(b[i+2])];
sb.append(newString(bytes));
}
if(more_len==1){
byteb_2[]=newbyte[2];
b_2[0]=base[firstByte(b[len-1])];
b_2[1]=base[lastOneByte(b[len-1],6)];
sb.append(newString(b_2));
returnsb.append("==").toString();
}elseif(more_len==2){
byteb_3[]=newbyte[3];
b_3[0]=base[firstByte(b[len-2])];
b_3[1]=base[secondByte(b[len-2],b[len-1])];
b_3[2]=base[lastOneByte(b[len-1],4)];
sb.append(newString(b_3));
returnsb.append("=").toString();
}
returnsb.toString();
}</span>

<span style="font-weight: normal;">@Override
publicbytefirstByte(byteb){
//00000000000000000000000001010011
//01010011
intr_f=b&0xff;
r_f=r_f>>>2;
return(byte)(r_f&0x3f);
}</span>

<span style="font-weight: normal;">@Override
publicbytesecondByte(bytelast_b,bytenext_b){
intr_l=last_b&0xff;
intr_n=next_b&0xff;
r_l=r_l<<6;
r_l=r_l>>>2;
r_n=r_n>>>4;
return(byte)((r_l|r_n)&0x3f);
}</span>

<span style="font-weight: normal;">@Override
publicbytethirdByte(bytelast_b,bytenext_b){
intr_l=last_b&0xff;
intr_n=next_b&0xff;
r_l=r_l<<4;
r_l=r_l>>>2;
r_n=r_n>>>6;
return(byte)((r_l|r_n)&0x3f);
}</span>

<span style="font-weight: normal;">@Override
publicbytefourthByte(byteb){
intr_b=b&0xff;
r_b=r_b<<2;
r_b=r_b>>>2;
return(byte)(r_b&0x3f);
}
}</span>