com.github.pandachanv587.aesutil.util.KeyUtil Maven / Gradle / Ivy

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Java AES encryption/decryption tool

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package com.github.pandachanv587.aesutil.util;

import com.github.pandachanv587.aesutil.AESConfig;
import com.github.pandachanv587.aesutil.AESLevel;

import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;

public class KeyUtil {

    private static final String AES_STRING = "AES";

    /**
     * 创建 SecretKeySpec
     * 默认位数请查看 {@link AESLevel#DEFAULT}
     *
     * @param key 密钥
     * @return SecretKeySpec
     */
    public static SecretKeySpec createSecretKeySpec(String key) {
        return createSecretKeySpec(key, AESLevel.DEFAULT);
    }

    /**
     * 根据 {@link AESConfig} 创建 SecretKeySpec
     *
     * @param aesConfig AES配置
     * @return SecretKeySpec
     */
    public static SecretKeySpec createSecretKeySpec(AESConfig aesConfig) {
        return createSecretKeySpec(aesConfig.getKey(), aesConfig.getLevel());
    }

    /**
     * 创建 SecretKeySpec
     *
     * @param key   密钥
     * @param level AES加密位数
     * @return SecretKeySpec
     */
    protected static SecretKeySpec createSecretKeySpec(String key, AESLevel level) {
        byte[] keyBytes = new byte[level.getValue() / 8];
        byte[] passwordBytes = key.getBytes(StandardCharsets.UTF_8);
        int length = Math.min(passwordBytes.length, keyBytes.length);
        System.arraycopy(passwordBytes, 0, keyBytes, 0, length);
        return new SecretKeySpec(keyBytes, AES_STRING);
    }

}