摘要：內部類提供本服務的服務的類型算法名稱本服務的實現類的名稱別名列表空如果服務沒有別名屬性映射空如果實現沒有屬性以的算法為例輸出的結果其中查看支持的密鑰類型繼承類函數前三種是類的全路徑名稱帶有后三種中的方法返回中所有的條目返回中所有的條目中
java.security.Provider
內部類Service
/**
* Construct a new service.
*
* @param provider 提供本服務的Provider
* @param type 服務的類型
* @param algorithm 算法名稱
* @param className 本服務的實現類的名稱
* @param aliases 別名列表|空(如果服務沒有別名)
* @param attributes 屬性映射|空(如果實現沒有屬性)
*
* @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算法為例toString()輸出的結果
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
查看支持的密鑰類型：
public boolean supportsParameter(Object parameter)
attributes:SupportedKeyFormats=PKCS#8|X.509
繼承Properties類
函數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(前三種),value是spi類的全路徑名稱
key = 帶有Alg.Alias..(后三種),value = type.algorithm中的algorithm.
方法
返回Provider中所有的property條目Set
public synchronized Set> entrySet()
返回Provider中所有的Property條目中的Set
public Set
返回Provider中所有的Property條目中的Collection
public Collection
根據Type和algorithm獲取Service
public synchronized Service getService(String type, String algorithm)
繼承自Property的函數
添加
public synchronized Object put(Object key, Object value)
public synchronized void putAll(Map t)
刪除
public synchronized Object remove(Object key)
public synchronized void clear()
獲取
public Object get(Object key)
public String getProperty(String key)
type,algorithm到service的轉換
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);
}
}
}
調用parseLegacyPut()，實際是將type,algorithm等轉換成Map legacyMap;
引擎類在getInstance()的時候去調用Provider.getService(type,algorithm)方法，通過ServiceKey(type,algorithm)獲取到Service.
然后在引擎類的getInstance()中調用service.newInstance()返回引擎類spi的實例
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