zhouhaibin
2 months ago
7 changed files with 179 additions and 25 deletions
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package org.dromara.common.encrypt.utils; |
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import org.bouncycastle.crypto.engines.SM4Engine; |
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import org.bouncycastle.crypto.params.KeyParameter; |
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import org.bouncycastle.util.encoders.Hex; |
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import java.nio.charset.StandardCharsets; |
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import java.security.SecureRandom; |
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public class SM4Util { |
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private static final int BLOCK_SIZE = 16; // 块大小
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// 随机生成 SM4 密钥
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public static String generateKey() { |
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byte[] key = new byte[BLOCK_SIZE]; |
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new SecureRandom().nextBytes(key); |
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return Hex.toHexString(key); |
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} |
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// 加密
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public static String encrypt(String plainText, String hexKey) throws Exception { |
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byte[] input = plainText.getBytes(StandardCharsets.UTF_8); |
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byte[] keyBytes = Hex.decode(hexKey); |
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// 计算填充长度
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int paddingLength = BLOCK_SIZE - (input.length % BLOCK_SIZE); |
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byte[] paddedInput = new byte[input.length + paddingLength]; |
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// 复制原始数据
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System.arraycopy(input, 0, paddedInput, 0, input.length); |
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// PKCS7填充
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for (int i = input.length; i < paddedInput.length; i++) { |
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paddedInput[i] = (byte) paddingLength; |
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} |
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SM4Engine sm4 = new SM4Engine(); |
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sm4.init(true, new KeyParameter(keyBytes)); |
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byte[] encrypted = new byte[paddedInput.length]; |
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for (int i = 0; i < paddedInput.length; i += BLOCK_SIZE) { |
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sm4.processBlock(paddedInput, i, encrypted, i); |
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} |
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// SM4Engine sm4 = new SM4Engine();
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// sm4.init(true, new KeyParameter(keyBytes)); // 加密模式
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//
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// byte[] encrypted = new byte[input.length];
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// for (int i = 0; i < input.length; i += BLOCK_SIZE) {
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// sm4.processBlock(input, i, encrypted, i);
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// }
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return Hex.toHexString(encrypted); |
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} |
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// 解密
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public static String decrypt(String cipherText, String hexKey) throws Exception { |
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byte[] keyBytes = Hex.decode(hexKey); |
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byte[] encrypted = Hex.decode(cipherText); |
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SM4Engine sm4 = new SM4Engine(); |
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sm4.init(false, new KeyParameter(keyBytes)); // 解密模式
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byte[] decrypted = new byte[encrypted.length]; |
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for (int i = 0; i < encrypted.length; i += BLOCK_SIZE) { |
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sm4.processBlock(encrypted, i, decrypted, i); |
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} |
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return new String(decrypted, StandardCharsets.UTF_8).trim(); |
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} |
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} |
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