Java AES加密

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  • 2022-05-20 04:28
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该资源是java或在Android中实现aes加密的代码,是测试过的,另外还有ios端的代码,随后附上。
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package com.ytlcn.server; import java.io.*; public class Base64Encoder extends FilterOutputStream { private static final char[] chars = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' }; private int charCount; private int carryOver; /*** * Constructs a new Base64 encoder that writes output to the given * OutputStream. * * @param out * the output stream */ public Base64Encoder(OutputStream out) { super(out); } /*** * Writes the given byte to the output stream in an encoded form. * * @exception IOException * if an I/O error occurs */ public void write(int b) throws IOException { // Take 24-bits from three octets, translate into four encoded chars // Break lines at 76 chars // If necessary, pad with 0 bits on the right at the end // Use = signs as padding at the end to ensure encodedLength % 4 == 0 // Remove the sign bit, // thanks to Christian Schweingruber <chrigu@lorraine.ch> if (b < 0) { b += 256; } // First byte use first six bits, save last two bits if (charCount % 3 == 0) { int lookup = b >> 2; carryOver = b & 3; // last two bits out.write(chars[lookup]); } // Second byte use previous two bits and first four new bits, // save last four bits else if (charCount % 3 == 1) { int lookup = ((carryOver << 4) + (b >> 4)) & 63; carryOver = b & 15; // last four bits out.write(chars[lookup]); } // Third byte use previous four bits and first two new bits, // then use last six new bits else if (charCount % 3 == 2) { int lookup = ((carryOver << 2) + (b >> 6)) & 63; out.write(chars[lookup]); lookup = b & 63; // last six bits out.write(chars[lookup]); carryOver = 0; } charCount++; // Add newline every 76 output chars (that's 57 input chars) if (charCount % 57 == 0) { out.write('\n'); } } /*** * Writes the given byte array to the output stream in an encoded form. * * @param buf * the data to be written * @param off * the start offset of the data * @param len * the length of the data * @exception IOException * if an I/O error occurs */ public void write(byte[] buf, int off, int len) throws IOException { // This could of course be optimized for (int i = 0; i < len; i++) { write(buf[off + i]); } } /*** * Closes the stream, this MUST be called to ensure proper padding is * written to the end of the output stream. * * @exception IOException * if an I/O error occurs */ public void close() throws IOException { // Handle leftover bytes if (charCount % 3 == 1) { // one leftover int lookup = (carryOver << 4) & 63; out.write(chars[lookup]); out.write('='); out.write('='); } else if (charCount % 3 == 2) { // two leftovers int lookup = (carryOver << 2) & 63; out.write(chars[lookup]); out.write('='); } super.close(); } /*** * Returns the encoded form of the given unencoded string. The encoder uses * the ISO-8859-1 (Latin-1) encoding to convert the string to bytes. For * greater control over the encoding, encode the string to bytes yourself * and use encode(byte[]). * * @param unencoded * the string to encode * @return the encoded form of the unencoded string */ public static String encode(String unencoded) { byte[] bytes = null; try { bytes = unencoded.getBytes("UTF-8"); } catch (UnsupportedEncodingException ignored) { } return encode(bytes); } /*** * Returns the encoded form of the given unencoded string. * * @param bytes * the bytes to encode * @return the encoded form of the unencoded string */ public static String encode(byte[] bytes) { ByteArrayOutputStream out = new ByteArrayOutputStream( (int) (bytes.length * 1.37)); Base64Encoder encodedOut = new Base64Encoder(out); try { encodedOut.write(bytes); encodedOut.close(); return out.toString("UTF-8"); } catch (IOException ignored) { return null; } } public static void main(String[] args) throws Exception { if (args.length != 1) { System.err .println("Usage: java com.oreilly.servlet.Base64Encoder fileToEncode"); return; } Base64Encoder encoder = null; BufferedInputStream in = null; try { encoder = new Base64Encoder(System.out); in = new BufferedInputStream(new FileInputStream(args[0])); byte[] buf = new byte[4 * 1024]; // 4K buffer int bytesRead; while ((bytesRead = in.read(buf)) != -1) { encoder.write(buf, 0, bytesRead); } } finally { if (in != null) in.close(); if (encoder != null) encoder.close(); } } }
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