在使用java进行AES的时候，会用到如下方法： SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
但是在android4.2以上进行加密、解密时，会报类似badPadding的异常，但是把该代码替换成一下方法则一切都OK。 SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto"); AES加密算法：| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 | import java.security.SecureRandom; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec; public class AESUtil { public static String encrypt(String seed, String cleartext) throws Exception { byte [] rawKey = getRawKey(seed.getBytes()); byte [] result = encrypt(rawKey, cleartext.getBytes()); return toHex(result); } public static String decrypt(String seed, String encrypted) throws Exception { byte [] rawKey = getRawKey(seed.getBytes()); byte [] enc = toByte(encrypted); byte [] result = decrypt(rawKey, enc); return new String(result); } private static byte [] getRawKey( byte [] seed) throws Exception { KeyGenerator kgen = KeyGenerator.getInstance( "AES" ); // SecureRandom sr = SecureRandom.getInstance("SHA1PRNG"); SecureRandom sr = SecureRandom.getInstance( "SHA1PRNG" , "Crypto" ); sr.setSeed(seed); kgen.init( 128 , sr); // 192 and 256 bits may not be available SecretKey skey = kgen.generateKey(); byte [] raw = skey.getEncoded(); return raw; } private static byte [] encrypt( byte [] raw, byte [] clear) throws Exception { SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES" ); Cipher cipher = Cipher.getInstance( "AES" ); cipher.init(Cipher.ENCRYPT_MODE, skeySpec); byte [] encrypted = cipher.doFinal(clear); return encrypted; } private static byte [] decrypt( byte [] raw, byte [] encrypted) throws Exception { SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES" ); Cipher cipher = Cipher.getInstance( "AES" ); cipher.init(Cipher.DECRYPT_MODE, skeySpec); byte [] decrypted = cipher.doFinal(encrypted); return decrypted; } public static String toHex(String txt) { return toHex(txt.getBytes()); } public static String fromHex(String hex) { return new String(toByte(hex)); } public static byte [] toByte(String hexString) { int len = hexString.length()/ 2 ; byte [] result = new byte [len]; for ( int i = 0 ; i < len; i++) result[i] = Integer.valueOf(hexString.substring( 2 *i, 2 *i+ 2 ), 16 ).byteValue(); return result; } public static String toHex( byte [] buf) { if (buf == null ) return "" ; StringBuffer result = new StringBuffer( 2 *buf.length); for ( int i = 0 ; i < buf.length; i++) { appendHex(result, buf[i]); } return result.toString(); } private final static String HEX = "0123456789ABCDEF" ; private static void appendHex(StringBuffer sb, byte b) { sb.append(HEX.charAt((b>> 4 )& 0x0f )).append(HEX.charAt(b& 0x0f )); } } |
DES加密算法
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 | import java.io.UnsupportedEncodingException; import java.security.Key; import java.util.Locale; import javax.crypto.Cipher; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESedeKeySpec; import javax.crypto.spec.IvParameterSpec; /** * DES加密 * * @author houjinyun * */ public class DesUtils { private static final String KEY = "********************" ; /** * 对字符串进行DES3加密 * * @param str * @return 加密后的字符串，若失败则返回null */ public static String encode(String str) { try { byte [] key = KEY.getBytes( "UTF-8" ); byte [] data = str.getBytes( "UTF-8" ); byte [] encodedData = des3EncodeECB(key, data); return byte2HexString(encodedData); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } return null ; } public static String decode(String str) { try { byte [] key = KEY.getBytes( "UTF-8" ); byte [] data = hexString2Byte(str); byte [] decodedData = des3DecodeECB(key, data); return new String(decodedData, "UTF-8" ); } catch (Exception e) { e.printStackTrace(); } return null ; } /** * ECB加密,不要IV * * @param key * 密钥 * @param data * 明文 * @return Base64编码的密文 * @throws Exception */ public static byte [] des3EncodeECB( byte [] key, byte [] data) throws Exception { Key deskey = null ; DESedeKeySpec spec = new DESedeKeySpec(key); SecretKeyFactory keyfactory = SecretKeyFactory.getInstance( "desede" ); deskey = keyfactory.generateSecret(spec); Cipher cipher = Cipher.getInstance( "desede" + "/ECB/PKCS5Padding" ); cipher.init(Cipher.ENCRYPT_MODE, deskey); byte [] bOut = cipher.doFinal(data); return bOut; } /** * ECB解密,不要IV * * @param key * 密钥 * @param data * Base64编码的密文 * @return 明文 * @throws Exception */ public static byte [] ees3DecodeECB( byte [] key, byte [] data) throws Exception { Key deskey = null ; DESedeKeySpec spec = new DESedeKeySpec(key); SecretKeyFactory keyfactory = SecretKeyFactory.getInstance( "desede" ); deskey = keyfactory.generateSecret(spec); Cipher cipher = Cipher.getInstance( "desede" + "/ECB/PKCS5Padding" ); cipher.init(Cipher.DECRYPT_MODE, deskey); byte [] bOut = cipher.doFinal(data); return bOut; } /** * CBC加密 * * @param key * 密钥 * @param keyiv * IV * @param data * 明文 * @return Base64编码的密文 * @throws Exception */ public static byte [] des3EncodeCBC( byte [] key, byte [] keyiv, byte [] data) throws Exception { Key deskey = null ; DESedeKeySpec spec = new DESedeKeySpec(key); SecretKeyFactory keyfactory = SecretKeyFactory.getInstance( "desede" ); deskey = keyfactory.generateSecret(spec); Cipher cipher = Cipher.getInstance( "desede" + "/CBC/PKCS5Padding" ); IvParameterSpec ips = new IvParameterSpec(keyiv); cipher.init(Cipher.ENCRYPT_MODE, deskey, ips); byte [] bOut = cipher.doFinal(data); return bOut; } /** * CBC解密 * * @param key * 密钥 * @param keyiv * IV * @param data * Base64编码的密文 * @return 明文 * @throws Exception */ public static byte [] des3DecodeCBC( byte [] key, byte [] keyiv, byte [] data) throws Exception { Key deskey = null ; DESedeKeySpec spec = new DESedeKeySpec(key); SecretKeyFactory keyfactory = SecretKeyFactory.getInstance( "desede" ); deskey = keyfactory.generateSecret(spec); Cipher cipher = Cipher.getInstance( "desede" + "/CBC/PKCS5Padding" ); IvParameterSpec ips = new IvParameterSpec(keyiv); cipher.init(Cipher.DECRYPT_MODE, deskey, ips); byte [] bOut = cipher.doFinal(data); return bOut; } public static byte [] des3DecodeECB( byte [] key, byte [] data) throws Exception { Key deskey = null ; DESedeKeySpec spec = new DESedeKeySpec(key); SecretKeyFactory keyfactory = SecretKeyFactory.getInstance( "desede" ); deskey = keyfactory.generateSecret(spec); Cipher cipher = Cipher.getInstance( "desede" + "/ECB/PKCS5Padding" ); cipher.init(Cipher.DECRYPT_MODE, deskey); byte [] bOut = cipher.doFinal(data); return bOut; } private static String byte2HexString( byte [] b) { String a = "" ; for ( int i = 0 ; i < b.length; i++) { String hex = Integer.toHexString(b[i] & 0xFF ) .toUpperCase(Locale.US); if (hex.length() == 1 ) { hex = '0' + hex; } a = a + hex; } return a; } private static byte [] hexString2Byte(String str) { if (str == null ) return null ; str = str.trim(); int len = str.length(); if (len == 0 || len % 2 == 1 ) return null ; byte [] b = new byte [len / 2 ]; try { for ( int i = 0 ; i < str.length(); i += 2 ) { b[i / 2 ] = ( byte ) Integer.decode( "0x" + str.substring(i, i + 2 )).intValue(); } return b; } catch (Exception e) { return null ; } } } |
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