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131 lines
4.4 KiB
131 lines
4.4 KiB
package com.huateng.util.sm4;
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public class SM4_Context {
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public int mode = 1;
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public long[] sk = new long[32];
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public boolean isPadding = true;
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protected SM4_Context() {
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}
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/**
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* 加密
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* @param plainText 参数
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* @param keyBytes 随机码
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* @return
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*/
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public byte[] EncryptByte(byte[] plainText,byte[] keyBytes) {
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if (keyBytes != null && keyBytes.length == 16) {
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if (plainText != null && plainText.length > 0) {
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try {
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SM4_Context ctx = new SM4_Context();
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ctx.isPadding = true;
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ctx.mode = 1;
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SM4 sm4 = new SM4();
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sm4.sm4_setkey_enc(ctx, keyBytes);
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byte[] encrypted = sm4.sm4_crypt_ecb(ctx, plainText);
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return encrypted;
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} catch (Exception var6) {
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var6.printStackTrace();
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return null;
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}
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} else {
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return null;
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}
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} else {
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return null;
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}
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}
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/**
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* 解密
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* @param cipherText 密文
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* @param keyBytes 随机码
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* @return
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*/
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public byte[] DecryptStrByte(byte[] cipherText,byte[] keyBytes) {
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if (keyBytes != null && keyBytes.length == 16) {
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if (cipherText != null && cipherText.length > 0 && cipherText.length % 16 == 0) {
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try {
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SM4_Context ctx = new SM4_Context();
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ctx.isPadding = true;
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ctx.mode = 0;
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SM4 sm4 = new SM4();
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sm4.sm4_setkey_dec(ctx, keyBytes);
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byte[] decrypted = sm4.sm4_crypt_ecb(ctx, cipherText);
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int decryptedLen = decrypted.length;
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for (int i = decrypted.length - 1; i >= 0 && decrypted[i] == 0; --decryptedLen) {
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--i;
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}
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byte[] temp = new byte[decryptedLen];
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System.arraycopy(decrypted, 0, temp, 0, decryptedLen);
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return temp;
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} catch (Exception var8) {
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var8.printStackTrace();
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return null;
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}
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} else {
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return null;
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}
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} else {
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return null;
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}
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}
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protected byte[] encryptData_CBC(byte[] ivBytes, byte[] keyBytes, byte[] plainText) {
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if (keyBytes != null && keyBytes.length != 0 && keyBytes.length % 16 == 0) {
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if (plainText != null && plainText.length > 0) {
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if (ivBytes != null && ivBytes.length > 0) {
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try {
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SM4_Context ctx = new SM4_Context();
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ctx.isPadding = true;
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ctx.mode = 1;
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SM4 sm4 = new SM4();
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sm4.sm4_setkey_enc(ctx, keyBytes);
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byte[] encrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, plainText);
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return encrypted;
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} catch (Exception var7) {
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var7.printStackTrace();
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return null;
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}
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} else {
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return null;
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}
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} else {
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return null;
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}
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} else {
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return null;
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}
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}
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protected byte[] decryptData_CBC(byte[] ivBytes, byte[] keyBytes, byte[] cipherText) {
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if (keyBytes != null && keyBytes.length != 0 && keyBytes.length % 16 == 0) {
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if (cipherText != null && cipherText.length > 0) {
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if (ivBytes != null && ivBytes.length > 0) {
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try {
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SM4_Context ctx = new SM4_Context();
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ctx.isPadding = true;
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ctx.mode = 0;
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SM4 sm4 = new SM4();
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sm4.sm4_setkey_dec(ctx, keyBytes);
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byte[] decrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, cipherText);
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return decrypted;
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} catch (Exception var7) {
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var7.printStackTrace();
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return null;
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}
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} else {
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return null;
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}
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} else {
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return null;
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}
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} else {
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return null;
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}
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}
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}
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