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Android中Sha1加密和RSA加密解密(记录)

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一、SHA-1加密

/**
 * SHA-1加密工具类
 */
public class SHA1Util {

    /**
     * SHA-1加密字符串
     *
     * @param info
     * @return
     */
    public static String getSHA(String info) {
        byte[] bytesSHA = null;
        try {
            // 得到一个SHA-1的消息摘要
            MessageDigest messageDigest = MessageDigest.getInstance("SHA-1");
            // 添加要进行计算摘要的信息
            messageDigest.update(info.getBytes());
            // 得到该摘要
            bytesSHA = messageDigest.digest();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        String strSHA = byteToHex(bytesSHA);
        return strSHA;
    }

    /**
     * Bytes数组转换为字符串
     *
     * @param bytes
     * @return
     */
    private static String byteToHex(byte[] bytes) {
        String hs = "";
        String temp;
        for (byte b : bytes) {
            temp = (Integer.toHexString(b & 0XFF));
            if (temp.length() == 1) {
                hs = hs + "0" + temp;
            } else {
                hs = hs + temp;
            }
        }
        return hs;
    }
}

二、RSA加密与解密

/**
 * RSA加密解密工具类
 */
public class RSAUtil {

    public static final String RSA = "RSA";// 非对称加密密钥算法
    public static final String ECB_PKCS1_PADDING = "RSA/ECB/PKCS1Padding";//加密填充方式
    public static final int DEFAULT_KEY_SIZE = 2048;//秘钥默认长度
    public static final byte[] DEFAULT_SPLIT = "#PART#".getBytes();    // 当要加密的内容超过bufferSize,则采用partSplit进行分块加密
    public static final int DEFAULT_BUFFERSIZE = (DEFAULT_KEY_SIZE / 8) - 11;// 当前秘钥支持加密的最大字节数

    /**
     * 字符串转化为公钥
     *
     * @param key
     * @return
     * @throws Exception
     */
    public static PublicKey getPublicKey(String key) throws Exception {
        byte[] keyBytes;
        keyBytes = (new BASE64Decoder()).decodeBuffer(key);
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey publicKey = keyFactory.generatePublic(keySpec);
        return publicKey;
    }

    /**
     * 字符串转化为私钥
     *
     * @param key
     * @return
     * @throws Exception
     */
    public static PrivateKey getPrivateKey(String key) throws Exception {
        byte[] keyBytes;
        keyBytes = (new BASE64Decoder()).decodeBuffer(key);
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
        return privateKey;
    }

    /**
     * 用公钥对字符串进行加密
     *
     * @param data 原文
     */
    public static byte[] encryptByPublicKey(byte[] data, byte[] publicKey) throws Exception {
        // 得到公钥
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKey);
        KeyFactory kf = KeyFactory.getInstance(RSA);
        PublicKey keyPublic = kf.generatePublic(keySpec);
        // 加密数据
        Cipher cp = Cipher.getInstance(ECB_PKCS1_PADDING);
        cp.init(Cipher.ENCRYPT_MODE, keyPublic);
        return cp.doFinal(data);
    }

    /**
     * 私钥加密
     *
     * @param data       待加密数据
     * @param privateKey 密钥
     * @return byte[] 加密数据
     */
    public static byte[] encryptByPrivateKey(byte[] data, byte[] privateKey) throws Exception {
        // 得到私钥
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(privateKey);
        KeyFactory kf = KeyFactory.getInstance(RSA);
        PrivateKey keyPrivate = kf.generatePrivate(keySpec);
        // 数据加密
        Cipher cipher = Cipher.getInstance(ECB_PKCS1_PADDING);
        cipher.init(Cipher.ENCRYPT_MODE, keyPrivate);
        return cipher.doFinal(data);
    }

    /**
     * 公钥解密
     *
     * @param data      待解密数据
     * @param publicKey 密钥
     * @return byte[] 解密数据
     */
    public static byte[] decryptByPublicKey(byte[] data, byte[] publicKey) throws Exception {
        // 得到公钥
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKey);
        KeyFactory kf = KeyFactory.getInstance(RSA);
        PublicKey keyPublic = kf.generatePublic(keySpec);
        // 数据解密
        Cipher cipher = Cipher.getInstance(ECB_PKCS1_PADDING);
        cipher.init(Cipher.DECRYPT_MODE, keyPublic);
        return cipher.doFinal(data);
    }

    /**
     * 使用私钥进行解密
     *
     * @param encrypted
     * @param privateKey
     * @return
     * @throws Exception
     */
    public static byte[] decryptByPrivateKey(byte[] encrypted, byte[] privateKey) throws Exception {
        // 得到私钥
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(privateKey);
        KeyFactory kf = KeyFactory.getInstance(RSA);
        PrivateKey keyPrivate = kf.generatePrivate(keySpec);

        // 解密数据
        Cipher cp = Cipher.getInstance(ECB_PKCS1_PADDING);
        cp.init(Cipher.DECRYPT_MODE, keyPrivate);
        byte[] arr = cp.doFinal(encrypted);
        return arr;
    }

    /**
     * 用公钥对字符串进行分段加密
     *
     * @param data
     * @param publicKey
     * @return
     * @throws Exception
     */
    public static byte[] encryptByPublicKeyForSpilt(byte[] data, byte[] publicKey) throws Exception {
        int dataLen = data.length;
        if (dataLen <= DEFAULT_BUFFERSIZE) {
            return encryptByPublicKey(data, publicKey);
        }
        List<Byte> allBytes = new ArrayList<Byte>(2048);
        int bufIndex = 0;
        int subDataLoop = 0;
        byte[] buf = new byte[DEFAULT_BUFFERSIZE];
        for (int i = 0; i < dataLen; i++) {
            buf[bufIndex] = data[i];
            if (++bufIndex == DEFAULT_BUFFERSIZE || i == dataLen - 1) {
                subDataLoop++;
                if (subDataLoop != 1) {
                    for (byte b : DEFAULT_SPLIT) {
                        allBytes.add(b);
                    }
                }
                byte[] encryptBytes = encryptByPublicKey(buf, publicKey);
                for (byte b : encryptBytes) {
                    allBytes.add(b);
                }
                bufIndex = 0;
                if (i == dataLen - 1) {
                    buf = null;
                } else {
                    buf = new byte[Math.min(DEFAULT_BUFFERSIZE, dataLen - i - 1)];
                }
            }
        }
        byte[] bytes = new byte[allBytes.size()];
        {
            int i = 0;
            for (Byte b : allBytes) {
                bytes[i++] = b.byteValue();
            }
        }
        return bytes;
    }

    /**
     * 分段加密
     *
     * @param data       要加密的原始数据
     * @param privateKey 秘钥
     */
    public static byte[] encryptByPrivateKeyForSpilt(byte[] data, byte[] privateKey) throws Exception {
        int dataLen = data.length;
        if (dataLen <= DEFAULT_BUFFERSIZE) {
            return encryptByPrivateKey(data, privateKey);
        }
        List<Byte> allBytes = new ArrayList<Byte>(2048);
        int bufIndex = 0;
        int subDataLoop = 0;
        byte[] buf = new byte[DEFAULT_BUFFERSIZE];
        for (int i = 0; i < dataLen; i++) {
            buf[bufIndex] = data[i];
            if (++bufIndex == DEFAULT_BUFFERSIZE || i == dataLen - 1) {
                subDataLoop++;
                if (subDataLoop != 1) {
                    for (byte b : DEFAULT_SPLIT) {
                        allBytes.add(b);
                    }
                }
                byte[] encryptBytes = encryptByPrivateKey(buf, privateKey);
                for (byte b : encryptBytes) {
                    allBytes.add(b);
                }
                bufIndex = 0;
                if (i == dataLen - 1) {
                    buf = null;
                } else {
                    buf = new byte[Math.min(DEFAULT_BUFFERSIZE, dataLen - i - 1)];
                }
            }
        }
        byte[] bytes = new byte[allBytes.size()];
        {
            int i = 0;
            for (Byte b : allBytes) {
                bytes[i++] = b.byteValue();
            }
        }
        return bytes;
    }

    /**
     * 公钥分段解密
     *
     * @param encrypted 待解密数据
     * @param publicKey 密钥
     */
    public static byte[] decryptByPublicKeyForSpilt(byte[] encrypted, byte[] publicKey) throws Exception {
        int splitLen = DEFAULT_SPLIT.length;
        if (splitLen <= 0) {
            return decryptByPublicKey(encrypted, publicKey);
        }
        int dataLen = encrypted.length;
        List<Byte> allBytes = new ArrayList<Byte>(1024);
        int latestStartIndex = 0;
        for (int i = 0; i < dataLen; i++) {
            byte bt = encrypted[i];
            boolean isMatchSplit = false;
            if (i == dataLen - 1) {
                // 到data的最后了
                byte[] part = new byte[dataLen - latestStartIndex];
                System.arraycopy(encrypted, latestStartIndex, part, 0, part.length);
                byte[] decryptPart = decryptByPublicKey(part, publicKey);
                for (byte b : decryptPart) {
                    allBytes.add(b);
                }
                latestStartIndex = i + splitLen;
                i = latestStartIndex - 1;
            } else if (bt == DEFAULT_SPLIT[0]) {
                // 这个是以split[0]开头
                if (splitLen > 1) {
                    if (i + splitLen < dataLen) {
                        // 没有超出data的范围
                        for (int j = 1; j < splitLen; j++) {
                            if (DEFAULT_SPLIT[j] != encrypted[i + j]) {
                                break;
                            }
                            if (j == splitLen - 1) {
                                // 验证到split的最后一位,都没有break,则表明已经确认是split段
                                isMatchSplit = true;
                            }
                        }
                    }
                } else {
                    // split只有一位,则已经匹配了
                    isMatchSplit = true;
                }
            }
            if (isMatchSplit) {
                byte[] part = new byte[i - latestStartIndex];
                System.arraycopy(encrypted, latestStartIndex, part, 0, part.length);
                byte[] decryptPart = decryptByPublicKey(part, publicKey);
                for (byte b : decryptPart) {
                    allBytes.add(b);
                }
                latestStartIndex = i + splitLen;
                i = latestStartIndex - 1;
            }
        }
        byte[] bytes = new byte[allBytes.size()];
        {
            int i = 0;
            for (Byte b : allBytes) {
                bytes[i++] = b.byteValue();
            }
        }
        return bytes;
    }

    /**
     * 使用私钥分段解密
     *
     * @param encrypted
     * @param privateKey
     * @return
     * @throws Exception
     */
    public static byte[] decryptByPrivateKeyForSpilt(byte[] encrypted, byte[] privateKey) throws Exception {
        int splitLen = DEFAULT_SPLIT.length;
        if (splitLen <= 0) {
            return decryptByPrivateKey(encrypted, privateKey);
        }
        int dataLen = encrypted.length;
        List<Byte> allBytes = new ArrayList<Byte>(1024);
        int latestStartIndex = 0;
        for (int i = 0; i < dataLen; i++) {
            byte bt = encrypted[i];
            boolean isMatchSplit = false;
            if (i == dataLen - 1) {
                // 到data的最后了
                byte[] part = new byte[dataLen - latestStartIndex];
                System.arraycopy(encrypted, latestStartIndex, part, 0, part.length);
                byte[] decryptPart = decryptByPrivateKey(part, privateKey);
                for (byte b : decryptPart) {
                    allBytes.add(b);
                }
                latestStartIndex = i + splitLen;
                i = latestStartIndex - 1;
            } else if (bt == DEFAULT_SPLIT[0]) {
                // 这个是以split[0]开头
                if (splitLen > 1) {
                    if (i + splitLen < dataLen) {
                        // 没有超出data的范围
                        for (int j = 1; j < splitLen; j++) {
                            if (DEFAULT_SPLIT[j] != encrypted[i + j]) {
                                break;
                            }
                            if (j == splitLen - 1) {
                                // 验证到split的最后一位,都没有break,则表明已经确认是split段
                                isMatchSplit = true;
                            }
                        }
                    }
                } else {
                    // split只有一位,则已经匹配了
                    isMatchSplit = true;
                }
            }
            if (isMatchSplit) {
                byte[] part = new byte[i - latestStartIndex];
                System.arraycopy(encrypted, latestStartIndex, part, 0, part.length);
                byte[] decryptPart = decryptByPrivateKey(part, privateKey);
                for (byte b : decryptPart) {
                    allBytes.add(b);
                }
                latestStartIndex = i + splitLen;
                i = latestStartIndex - 1;
            }
        }
        byte[] bytes = new byte[allBytes.size()];
        {
            int i = 0;
            for (Byte b : allBytes) {
                bytes[i++] = b.byteValue();
            }
        }
        return bytes;
    }
}

备注:

(1)BASE64Encoder需要添加jar包到项目中。下载连接:https://pan.baidu.com/s/1t3IQKYDe-tlEHRlDP4Ufbg

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