Android通信加密
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最近项目中需要和服务器端通信进行加密，无奈只好上咯。以下为本次加密所用到的一些类，和用法，
1:RSA加密
package com.shcc.microcredit.utils;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.InputStream;import java.io.UnsupportedEncodingException;import java.security.KeyFactory;import java.security.PrivateKey;import java.security.PublicKey;import java.security.spec.PKCS8EncodedKeySpec;import java.security.spec.X509EncodedKeySpec;import javax.crypto.Cipher;public class RSAUtil { public static String ALGORITHM = "RSA/ECB/PKCS1Padding"; public static String SIGN_ALGORITHMS = "SHA1WithRSA";// 摘要加密算饭 private static String log = "RSAUtil"; public static String CHAR_SET = "UTF-8"; /** * 数据签名 * * @param content * 签名内容 * @param privateKey * 私钥 * @return 返回签名数据 */ public static String sign(String content, String privateKey) { try { PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec( Base64Utils.decode(privateKey)); KeyFactory keyf = KeyFactory.getInstance("RSA"); PrivateKey priKey = keyf.generatePrivate(priPKCS8); java.security.Signature signature = java.security.Signature .getInstance(SIGN_ALGORITHMS); signature.initSign(priKey); signature.update(content.getBytes(CHAR_SET)); byte[] signed = signature.sign(); return Base64Utils.encode(signed); } catch (Exception e) { e.printStackTrace(); } return null; } /** * 签名验证 * * @param content * @param sign * @param public_key * @return */ public static boolean verify(String content, String sign, String publicKey) { try { KeyFactory keyFactory = KeyFactory.getInstance("RSA"); byte[] encodedKey = Base64Utils.decode(publicKey); PublicKey pubKey = keyFactory .generatePublic(new X509EncodedKeySpec(encodedKey)); java.security.Signature signature = java.security.Signature .getInstance(SIGN_ALGORITHMS); signature.initVerify(pubKey); signature.update(content.getBytes(CHAR_SET)); boolean bverify = signature.verify(Base64Utils.decode(sign)); return bverify; } catch (Exception e) { e.printStackTrace(); } return false; } /** * 通过公钥解密 * * @param content待解密数据 * @param pk公钥 * @return 返回 解密后的数据 */ protected static byte[] decryptByPublicKey(String content, PublicKey pk) { try { Cipher ch = Cipher.getInstance(ALGORITHM); ch.init(Cipher.DECRYPT_MODE, pk); InputStream ins = new ByteArrayInputStream(Base64Utils.decode(content)); ByteArrayOutputStream writer = new ByteArrayOutputStream(); // rsa解密的字节大小最多是128，将需要解密的内容，按128位拆开解密 byte[] buf = new byte[128]; int bufl; while ((bufl = ins.read(buf)) != -1) { byte[] block = null; if (buf.length == bufl) { block = buf; } else { block = new byte[bufl]; for (int i = 0; i < bufl; i++) { block[i] = buf[i]; } } writer.write(ch.doFinal(block)); } return writer.toByteArray(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } /** * 通过私钥解密 * * @param content待解密数据 * @param pk公钥 * @return 返回 解密后的数据 */ protected static byte[] decryptByPrivateKey(String content, PrivateKey pk) { try { Cipher ch = Cipher.getInstance(ALGORITHM); ch.init(Cipher.DECRYPT_MODE, pk); InputStream ins = new ByteArrayInputStream(Base64Utils.decode(content)); ByteArrayOutputStream writer = new ByteArrayOutputStream(); // rsa解密的字节大小最多是128，将需要解密的内容，按128位拆开解密 byte[] buf = new byte[128]; int bufl; while ((bufl = ins.read(buf)) != -1) { byte[] block = null; if (buf.length == bufl) { block = buf; } else { block = new byte[bufl]; for (int i = 0; i < bufl; i++) { block[i] = buf[i]; } } writer.write(ch.doFinal(block)); } return writer.toByteArray(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } /** * 通过私钥加密 * * @param content * @param pk * @return,加密数据，未进行Base64Utils进行加密 */ protected static byte[] encryptByPrivateKey(String content, PrivateKey pk) { try { Cipher ch = Cipher.getInstance(ALGORITHM); ch.init(Cipher.ENCRYPT_MODE, pk); return ch.doFinal(content.getBytes(CHAR_SET)); } catch (Exception e) { e.printStackTrace(); System.out.println("通过私钥加密出错"); } return null; } /** * 通过公钥加密 * * @param content * @param pk * @return,加密数据，未进行Base64Utils进行加密 */ protected static byte[] encryptByPublicKey(String content, PublicKey pk) { try { Cipher ch = Cipher.getInstance(ALGORITHM); ch.init(Cipher.ENCRYPT_MODE, pk); return ch.doFinal(content.getBytes(CHAR_SET)); } catch (Exception e) { e.printStackTrace(); System.out.println("通过公钥加密出错"); } return null; } /** * 解密数据，接收端接收到数据直接解密 * * @param content * @param key * @return */ public static String decryptByPublicKey(String content, String key) { System.out.println(log + "：decrypt方法中key=" + key); if (null == key || "".equals(key)) { System.out.println(log + "：decrypt方法中key=" + key); return null; } PublicKey pk = SignConfig.getPublicKey(key); byte[] data = decryptByPublicKey(content, pk); String res = null; try { res = new String(data, CHAR_SET); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } return res; } /** * 解密数据，接收端接收到数据直接解密,解密内容 * * @param content * @param key * @return */ public static String decryptByPrivateKey(String content, String key) { System.out.println(log + "：decrypt方法中key=" + key); if (null == key || "".equals(key)) { System.out.println(log + "：decrypt方法中key=" + key); return null; } PrivateKey pk = SignConfig.getPrivateKey(key); byte[] data = decryptByPrivateKey(content, pk); String res = null; try { res = new String(data, CHAR_SET); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } return res; } /** * 对内容进行加密 * * @param content * @param key私钥 * @return */ public static String encryptByPrivateKey(String content, String key) { PrivateKey pk = SignConfig.getPrivateKey(key); byte[] data = encryptByPrivateKey(content, pk); String res = null; try { res = Base64Utils.encode(data); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return res; } /** * 对内容进行加密 * * @param content * @param key公钥 * @return */ public static String encryptByPublicKey(String content, String key) { PublicKey pk = SignConfig.getPublicKey(key); byte[] data = encryptByPublicKey(content, pk); String res = null; try { res = Base64Utils.encode(data); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return res; }}2：数据之间的HASH算法加密
package com.shcc.microcredit.utils;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;public class StringEncrypt { /** * 对字符串加密,加密算法使用MD5,SHA-1,SHA-256,默认使用SHA-256 * * @param strSrc * 要加密的字符串 * @param encName * 加密类型 * @return */ public static String Encrypt(String strSrc, String encName) { MessageDigest md = null; String strDes = null; byte[] bt = strSrc.getBytes(); try { if (encName == null || encName.equals("")) { encName = "SHA-256"; } md = MessageDigest.getInstance(encName); md.update(bt); strDes = bytes2Hex(md.digest()); // to HexString } catch (NoSuchAlgorithmException e) { return null; } return strDes; } public static String bytes2Hex(byte[] bts) { String des = ""; String tmp = null; for (int i = 0; i < bts.length; i++) { tmp = (Integer.toHexString(bts[i] & 0xFF)); if (tmp.length() == 1) { des += "0"; } des += tmp; } return des; }}3:dese加密
package com.shcc.microcredit.utils;import java.io.UnsupportedEncodingException;import javax.crypto.Cipher;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec;/** * Created by liwenjie on 2015/11/9. */public class EncryptUtils { private static final String Algorithm = "DESede"; /** * ���ܷ��� * * @param src * Դ���ݵ��ֽ����� * @return */ public static byte[] encryptMode(byte[] src,String PASSWORD_CRYPT_KEY) { try { // ������Կ SecretKey deskey = new SecretKeySpec( build3DesKey(PASSWORD_CRYPT_KEY), Algorithm); // ʵ����Cipher Cipher cipher = Cipher.getInstance(Algorithm); cipher.init(Cipher.ENCRYPT_MODE, deskey); return cipher.doFinal(src); } catch (java.security.NoSuchAlgorithmException e1) { e1.printStackTrace(); } catch (javax.crypto.NoSuchPaddingException e2) { e2.printStackTrace(); } catch (java.lang.Exception e3) { e3.printStackTrace(); } return null; } /** * ���ܺ��� * * @param src * ���ĵ��ֽ����� * @return */ public static byte[] decryptMode(byte[] src,String PASSWORD_CRYPT_KEY) { try { SecretKey deskey = new SecretKeySpec( build3DesKey(PASSWORD_CRYPT_KEY), Algorithm); Cipher c1 = Cipher.getInstance(Algorithm); c1.init(Cipher.DECRYPT_MODE, deskey); return c1.doFinal(src); } catch (java.security.NoSuchAlgorithmException e1) { e1.printStackTrace(); } catch (javax.crypto.NoSuchPaddingException e2) { e2.printStackTrace(); } catch (java.lang.Exception e3) { e3.printStackTrace(); } return null; } /** * �����ַ���������Կ24λ���ֽ����� * * @param keyStr * @return * @throws UnsupportedEncodingException */ public static byte[] build3DesKey(String keyStr) throws UnsupportedEncodingException { byte[] key = new byte[24]; byte[] temp = keyStr.getBytes("UTF-8"); if (key.length > temp.length) { System.arraycopy(temp, 0, key, 0, temp.length); } else { System.arraycopy(temp, 0, key, 0, key.length); } return key; } public static void main(String[] args) { }}4:base64
package com.shcc.microcredit.utils;/* * Copyright (C) 2010 The MobileSecurePay Project * All right reserved. * author: shiqun.shi@Lakala.com */public final class Base64Utils { static private final int BASELENGTH = 128; static private final int LOOKUPLENGTH = 64; static private final int TWENTYFOURBITGROUP = 24; static private final int EIGHTBIT = 8; static private final int SIXTEENBIT = 16; static private final int FOURBYTE = 4; static private final int SIGN = -128; static private final char PAD = '='; static private final boolean fDebug = false; static final private byte[] base64Alphabet = new byte[BASELENGTH]; static final private char[] lookUpBase64Alphabet = new char[LOOKUPLENGTH]; static { for (int i = 0; i < BASELENGTH; ++i) { base64Alphabet[i] = -1; } for (int i = 'Z'; i >= 'A'; i--) { base64Alphabet[i] = (byte) (i - 'A'); } for (int i = 'z'; i >= 'a'; i--) { base64Alphabet[i] = (byte) (i - 'a' + 26); } for (int i = '9'; i >= '0'; i--) { base64Alphabet[i] = (byte) (i - '0' + 52); } base64Alphabet['+'] = 62; base64Alphabet['/'] = 63; for (int i = 0; i <= 25; i++) { lookUpBase64Alphabet[i] = (char) ('A' + i); } for (int i = 26, j = 0; i <= 51; i++, j++) { lookUpBase64Alphabet[i] = (char) ('a' + j); } for (int i = 52, j = 0; i <= 61; i++, j++) { lookUpBase64Alphabet[i] = (char) ('0' + j); } lookUpBase64Alphabet[62] = (char) '+'; lookUpBase64Alphabet[63] = (char) '/'; } private static boolean isWhiteSpace(char octect) { return (octect == 0x20 || octect == 0xd || octect == 0xa || octect == 0x9); } private static boolean isPad(char octect) { return (octect == PAD); } private static boolean isData(char octect) { return (octect < BASELENGTH && base64Alphabet[octect] != -1); } /** * Encodes hex octects into Base64 * * @param binaryData Array containing binaryData * @return Encoded Base64 array */ public static String encode(byte[] binaryData) { if (binaryData == null) { return null; } int lengthDataBits = binaryData.length * EIGHTBIT; if (lengthDataBits == 0) { return ""; } int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP; int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP; int numberQuartet = fewerThan24bits != 0 ? numberTriplets + 1 : numberTriplets; char encodedData[] = null; encodedData = new char[numberQuartet * 4]; byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0; int encodedIndex = 0; int dataIndex = 0; if (fDebug) { System.out.println("number of triplets = " + numberTriplets); } for (int i = 0; i < numberTriplets; i++) { b1 = binaryData[dataIndex++]; b2 = binaryData[dataIndex++]; b3 = binaryData[dataIndex++]; if (fDebug) { System.out.println("b1= " + b1 + ", b2= " + b2 + ", b3= " + b3); } l = (byte) (b2 & 0x0f); k = (byte) (b1 & 0x03); byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0); byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0); byte val3 = ((b3 & SIGN) == 0) ? (byte) (b3 >> 6) : (byte) ((b3) >> 6 ^ 0xfc); if (fDebug) { System.out.println("val2 = " + val2); System.out.println("k4 = " + (k << 4)); System.out.println("vak = " + (val2 | (k << 4))); } encodedData[encodedIndex++] = lookUpBase64Alphabet[val1]; encodedData[encodedIndex++] = lookUpBase64Alphabet[val2 | (k << 4)]; encodedData[encodedIndex++] = lookUpBase64Alphabet[(l << 2) | val3]; encodedData[encodedIndex++] = lookUpBase64Alphabet[b3 & 0x3f]; } // form integral number of 6-bit groups if (fewerThan24bits == EIGHTBIT) { b1 = binaryData[dataIndex]; k = (byte) (b1 & 0x03); if (fDebug) { System.out.println("b1=" + b1); System.out.println("b1<<2 = " + (b1 >> 2)); } byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0); encodedData[encodedIndex++] = lookUpBase64Alphabet[val1]; encodedData[encodedIndex++] = lookUpBase64Alphabet[k << 4]; encodedData[encodedIndex++] = PAD; encodedData[encodedIndex++] = PAD; } else if (fewerThan24bits == SIXTEENBIT) { b1 = binaryData[dataIndex]; b2 = binaryData[dataIndex + 1]; l = (byte) (b2 & 0x0f); k = (byte) (b1 & 0x03); byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0); byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0); encodedData[encodedIndex++] = lookUpBase64Alphabet[val1]; encodedData[encodedIndex++] = lookUpBase64Alphabet[val2 | (k << 4)]; encodedData[encodedIndex++] = lookUpBase64Alphabet[l << 2]; encodedData[encodedIndex++] = PAD; } return new String(encodedData); } /** * Decodes Base64 data into octects * * @param encoded string containing Base64 data * @return Array containind decoded data. */ public static byte[] decode(String encoded) { if (encoded == null) { return null; } char[] base64Data = encoded.toCharArray(); // remove white spaces int len = removeWhiteSpace(base64Data); if (len % FOURBYTE != 0) { return null;//should be divisible by four } int numberQuadruple = (len / FOURBYTE); if (numberQuadruple == 0) { return new byte[0]; } byte decodedData[] = null; byte b1 = 0, b2 = 0, b3 = 0, b4 = 0; char d1 = 0, d2 = 0, d3 = 0, d4 = 0; int i = 0; int encodedIndex = 0; int dataIndex = 0; decodedData = new byte[(numberQuadruple) * 3]; for (; i < numberQuadruple - 1; i++) { if (!isData((d1 = base64Data[dataIndex++])) || !isData((d2 = base64Data[dataIndex++])) || !isData((d3 = base64Data[dataIndex++])) || !isData((d4 = base64Data[dataIndex++]))) { return null; }//if found "no data" just return null b1 = base64Alphabet[d1]; b2 = base64Alphabet[d2]; b3 = base64Alphabet[d3]; b4 = base64Alphabet[d4]; decodedData[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4); decodedData[encodedIndex++] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf)); decodedData[encodedIndex++] = (byte) (b3 << 6 | b4); } if (!isData((d1 = base64Data[dataIndex++])) || !isData((d2 = base64Data[dataIndex++]))) { return null;//if found "no data" just return null } b1 = base64Alphabet[d1]; b2 = base64Alphabet[d2]; d3 = base64Data[dataIndex++]; d4 = base64Data[dataIndex++]; if (!isData((d3)) || !isData((d4))) {//Check if they are PAD characters if (isPad(d3) && isPad(d4)) { if ((b2 & 0xf) != 0)//last 4 bits should be zero { return null; } byte[] tmp = new byte[i * 3 + 1]; System.arraycopy(decodedData, 0, tmp, 0, i * 3); tmp[encodedIndex] = (byte) (b1 << 2 | b2 >> 4); return tmp; } else if (!isPad(d3) && isPad(d4)) { b3 = base64Alphabet[d3]; if ((b3 & 0x3) != 0)//last 2 bits should be zero { return null; } byte[] tmp = new byte[i * 3 + 2]; System.arraycopy(decodedData, 0, tmp, 0, i * 3); tmp[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4); tmp[encodedIndex] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf)); return tmp; } else { return null; } } else { //No PAD e.g 3cQl b3 = base64Alphabet[d3]; b4 = base64Alphabet[d4]; decodedData[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4); decodedData[encodedIndex++] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf)); decodedData[encodedIndex++] = (byte) (b3 << 6 | b4); } return decodedData; } /** * remove WhiteSpace from MIME containing encoded Base64 data. * * @param data the byte array of base64 data (with WS) * @return the new length */ private static int removeWhiteSpace(char[] data) { if (data == null) { return 0; } // count characters that's not whitespace int newSize = 0; int len = data.length; for (int i = 0; i < len; i++) { if (!isWhiteSpace(data[i])) { data[newSize++] = data[i]; } } return newSize; }}以上九尾全部的加密程序代码了。
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