摘要：内部类提供本服务的服务的类型算法名称本服务的实现类的名称别名列表空如果服务没有别名属性映射空如果实现没有属性以的算法为例输出的结果其中查看支持的密钥类型继承类函数前三种是类的全路径名称带有后三种中的方法返回中所有的条目返回中所有的条目中
java.security.Provider
内部类Service
/**
* Construct a new service.
*
* @param provider 提供本服务的Provider
* @param type 服务的类型
* @param algorithm 算法名称
* @param className 本服务的实现类的名称
* @param aliases 别名列表|空(如果服务没有别名)
* @param attributes 属性映射|空(如果实现没有属性)
*
* @throws NullPointerException if provider, type, algorithm, or
* className is null
*/
public Service(Provider provider, String type, String algorithm,
String className, List aliases, Map attributes)
以BC的RSA算法为例toString()输出的结果
BC: Cipher.RSA -> org.bouncycastle.jcajce.provider.asymmetric.rsa.CipherSpi$NoPadding
aliases: [RSA//RAW, RSA//NOPADDING]
attributes: {SupportedKeyFormats=PKCS#8|X.509, SupportedKeyClasses=javax.crypto.interfaces.RSAPublicKey|javax.crypto.interfaces.RSAPrivateKey}
BC: Cipher.RSA/OAEP -> org.bouncycastle.jcajce.provider.asymmetric.rsa.CipherSpi$OAEPPadding
aliases: [RSA//OAEPPADDING]
其中：
Service.className = org.bouncycastle.jcajce.provider.asymmetric.rsa.CipherSpi$NoPadding
Service.type = Cipher
Service.algorithm = RSA
查看支持的密钥类型：
public boolean supportsParameter(Object parameter)
attributes:SupportedKeyFormats=PKCS#8|X.509
继承Properties类
函数put：
Key=
type.algorithm
type.oid
type.OID.oid
Alg.Alias.type.algorithm
Alg.Alias.type.oid
Alg.Alias.type.OID.oid
value = className
key = type.algorithm(前三种),value是spi类的全路径名称
key = 带有Alg.Alias..(后三种),value = type.algorithm中的algorithm.
方法
返回Provider中所有的property条目Set
public synchronized Set> entrySet()
返回Provider中所有的Property条目中的Set
public Set
返回Provider中所有的Property条目中的Collection
public Collection
根据Type和algorithm获取Service
public synchronized Service getService(String type, String algorithm)
继承自Property的函数
添加
public synchronized Object put(Object key, Object value)
public synchronized void putAll(Map t)
删除
public synchronized Object remove(Object key)
public synchronized void clear()
获取
public Object get(Object key)
public String getProperty(String key)
type,algorithm到service的转换
provider.put(key,value)
name = key,value = value
private void parseLegacyPut(String name, String value) {
if (name.toLowerCase(ENGLISH).startsWith(ALIAS_PREFIX_LOWER)) {
// e.g. put("Alg.Alias.MessageDigest.SHA", "SHA-1");
// aliasKey ~ MessageDigest.SHA
String stdAlg = value;
String aliasKey = name.substring(ALIAS_LENGTH);
String[] typeAndAlg = getTypeAndAlgorithm(aliasKey);
if (typeAndAlg == null) {
return;
}
String type = getEngineName(typeAndAlg[0]);
String aliasAlg = typeAndAlg[1].intern();
ServiceKey key = new ServiceKey(type, stdAlg, true);
Service s = legacyMap.get(key);
if (s == null) {
s = new Service(this);
s.type = type;
s.algorithm = stdAlg;
legacyMap.put(key, s);
}
legacyMap.put(new ServiceKey(type, aliasAlg, true), s);
s.addAlias(aliasAlg);
} else {
String[] typeAndAlg = getTypeAndAlgorithm(name);
if (typeAndAlg == null) {
return;
}
int i = typeAndAlg[1].indexOf(" ");
if (i == -1) {
// e.g. put("MessageDigest.SHA-1", "sun.security.provider.SHA");
String type = getEngineName(typeAndAlg[0]);
String stdAlg = typeAndAlg[1].intern();
String className = value;
ServiceKey key = new ServiceKey(type, stdAlg, true);
Service s = legacyMap.get(key);
if (s == null) {
s = new Service(this);
s.type = type;
s.algorithm = stdAlg;
legacyMap.put(key, s);
}
s.className = className;
} else { // attribute
// e.g. put("MessageDigest.SHA-1 ImplementedIn", "Software");
String attributeValue = value;
String type = getEngineName(typeAndAlg[0]);
String attributeString = typeAndAlg[1];
String stdAlg = attributeString.substring(0, i).intern();
String attributeName = attributeString.substring(i + 1);
// kill additional spaces
while (attributeName.startsWith(" ")) {
attributeName = attributeName.substring(1);
}
attributeName = attributeName.intern();
ServiceKey key = new ServiceKey(type, stdAlg, true);
Service s = legacyMap.get(key);
if (s == null) {
s = new Service(this);
s.type = type;
s.algorithm = stdAlg;
legacyMap.put(key, s);
}
s.addAttribute(attributeName, attributeValue);
}
}
}
调用parseLegacyPut()，实际是将type,algorithm等转换成Map legacyMap;
引擎类在getInstance()的时候去调用Provider.getService(type,algorithm)方法，通过ServiceKey(type,algorithm)获取到Service.
然后在引擎类的getInstance()中调用service.newInstance()返回引擎类spi的实例
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