java.security包详解

一、Provider

提供DSA、RSA、MD5等算法

密钥的生成、转换、管理

 

二、Secruity

主要是管理Provider

public static int addProvider(Provider provider)

public static synchronized void removeProvider(String name)

public static Provider[] getProviders()

public static Provider getProvider(String name)

等等

 for (Provider p: Security.getProviders()){
                System.out.println(p);
                for (Map.Entry entry: p.entrySet()){
                    System.out.println("\t" + entry.getKey());
                }
            }

I/System.out: AndroidNSSP version 1.0
    	Provider.id info
    	Provider.id className
    	Provider.id version
    	Alg.Alias.TrustManagerFactory.X509
    	Provider.id name
    	TrustManagerFactory.PKIX
I/System.out: AndroidOpenSSL version 1.0
    	Alg.Alias.Cipher.RSA/None/OAEPWithSHA-1AndMGF1Padding
    	Cipher.AES_256/ECB/PKCS5Padding
    	Alg.Alias.Cipher.RSA/None/OAEPWithSHA-384AndMGF1Padding
    	Alg.Alias.Cipher.2.16.840.1.101.3.4.1.26
    	Cipher.RSA/ECB/NoPadding
    	Alg.Alias.Cipher.ChaCha20-Poly1305
    	Signature.SHA224withRSA SupportedKeyClasses
    	Alg.Alias.Signature.2.16.840.1.101.3.4.2.3with1.2.840.10045.2.1
    	Cipher.AES/ECB/PKCS5Padding
    	Alg.Alias.Mac.HMAC/SHA224
    	Cipher.AES_128/ECB/NoPadding
    	Alg.Alias.Mac.HMAC-SHA384
    	Cipher.AES/CBC/NoPadding
    	Provider.id name
    	KeyGenerator.AES
    	KeyFactory.EC
    	Alg.Alias.KeyGenerator.2.16.840.1.101.3.4.2.1
    	Signature.SHA256withRSA/PSS SupportedKeyClasses
    	Alg.Alias.Mac.1.3.6.1.5.5.8.1.2
    	Alg.Alias.Mac.1.3.6.1.5.5.8.1.1
    	Signature.SHA384withRSA SupportedKeyClasses
    	Alg.Alias.KeyGenerator.HMAC/SHA1
    	Alg.Alias.Signature.OID.1.2.840.10045.4.3.4
    	Alg.Alias.Signature.SHA-1/RSA
    	Alg.Alias.Signature.OID.1.2.840.10045.4.3.3
    	Alg.Alias.Signature.OID.1.2.840.10045.4.3.2
    	Alg.Alias.Signature.OID.1.2.840.10045.4.3.1
    	Alg.Alias.MessageDigest.SHA384
等等……

2、%JDK_HOME%\jre\lib\security\java.security

以下方法可以配置java.security文件：

public static String getProperty(String key)

public static void setProperty(String key, String datum)

三、MessageDigest

        MessageDigest类实现了摘要算法，支持MD2、MD5、SHA-1(SHA)、SHA-256、SHA-384、SHA512，算法名不区分大小写。

        MessageDigest类的实例：

public static MessageDigest getInstance(String algorithm)
    throws NoSuchAlgorithmException;

public static MessageDigest getInstance(String algorithm,Provider provider)
    throws NoSuchAlgorithmException

public static MessageDigest getInstance(String algorithm, String provider)
    throws NoSuchAlgorithmException, NoSuchProviderException;