在我看到document时，JCE有多个提供者。如何查找默认可用的提供程序？
答案 0 :(得分：1)
for (Provider provider : Security.getProviders())
System.out.printf("%-11s %s%n", provider.getName(), provider.getInfo());
Windows上的Oracle Java 9.0.1上的输出：
SUN SUN (DSA key/parameter generation; DSA signing; SHA-1, MD5 digests; SecureRandom; X.509 certificates; PKCS12, JKS & DKS keystores; PKIX CertPathValidator; PKIX CertPathBuilder; LDAP, Collection CertStores, JavaPolicy Policy; JavaLoginConfig Configuration)
SunRsaSign Sun RSA signature provider
SunEC Sun Elliptic Curve provider (EC, ECDSA, ECDH)
SunJSSE Sun JSSE provider(PKCS12, SunX509/PKIX key/trust factories, SSLv3/TLSv1/TLSv1.1/TLSv1.2/DTLSv1.0/DTLSv1.2)
SunJCE SunJCE Provider (implements RSA, DES, Triple DES, AES, Blowfish, ARCFOUR, RC2, PBE, Diffie-Hellman, HMAC)
SunJGSS Sun (Kerberos v5, SPNEGO)
SunSASL Sun SASL provider(implements client mechanisms for: DIGEST-MD5, EXTERNAL, PLAIN, CRAM-MD5, NTLM; server mechanisms for: DIGEST-MD5, CRAM-MD5, NTLM)
XMLDSig XMLDSig (DOM XMLSignatureFactory; DOM KeyInfoFactory; C14N 1.0, C14N 1.1, Exclusive C14N, Base64, Enveloped, XPath, XPath2, XSLT TransformServices)
SunPCSC Sun PC/SC provider
JdkLDAP JdkLDAP Provider (implements LDAP CertStore)
JdkSASL JDK SASL provider(implements client and server mechanisms for GSSAPI)
SunMSCAPI Sun's Microsoft Crypto API provider
SunPKCS11 Unconfigured and unusable PKCS11 provider
如果您想查看每个提供商提供的服务，请尝试以下方法：
for (Provider provider : Security.getProviders()) {
System.out.printf("%-11s %s%n", provider.getName(), provider.getInfo());
for (Service service : provider.getServices())
System.out.printf(" %s: %s%n", service.getType(), service.getAlgorithm());
}
输出
SUN SUN (DSA key/parameter generation; DSA signing; SHA-1, MD5 digests; SecureRandom; X.509 certificates; PKCS12, JKS & DKS keystores; PKIX CertPathValidator; PKIX CertPathBuilder; LDAP, Collection CertStores, JavaPolicy Policy; JavaLoginConfig Configuration)
SecureRandom: DRBG
SecureRandom: SHA1PRNG
Signature: SHA1withDSA
Signature: NONEwithDSA
Signature: SHA224withDSA
Signature: SHA256withDSA
Signature: SHA1withDSAinP1363Format
Signature: NONEwithDSAinP1363Format
Signature: SHA224withDSAinP1363Format
Signature: SHA256withDSAinP1363Format
KeyPairGenerator: DSA
MessageDigest: MD2
MessageDigest: MD5
MessageDigest: SHA
MessageDigest: SHA-224
MessageDigest: SHA-256
MessageDigest: SHA-384
MessageDigest: SHA-512
MessageDigest: SHA-512/224
MessageDigest: SHA-512/256
MessageDigest: SHA3-224
MessageDigest: SHA3-256
MessageDigest: SHA3-384
MessageDigest: SHA3-512
AlgorithmParameterGenerator: DSA
AlgorithmParameters: DSA
KeyFactory: DSA
CertificateFactory: X.509
KeyStore: PKCS12
KeyStore: JKS
KeyStore: CaseExactJKS
KeyStore: DKS
Policy: JavaPolicy
Configuration: JavaLoginConfig
CertPathBuilder: PKIX
CertPathValidator: PKIX
CertStore: Collection
CertStore: com.sun.security.IndexedCollection
SunRsaSign Sun RSA signature provider
KeyFactory: RSA
KeyPairGenerator: RSA
Signature: MD2withRSA
Signature: MD5withRSA
Signature: SHA1withRSA
Signature: SHA224withRSA
Signature: SHA256withRSA
Signature: SHA384withRSA
Signature: SHA512withRSA
SunEC Sun Elliptic Curve provider (EC, ECDSA, ECDH)
KeyFactory: EC
AlgorithmParameters: EC
Signature: NONEwithECDSA
Signature: SHA1withECDSA
Signature: SHA224withECDSA
Signature: SHA256withECDSA
Signature: SHA384withECDSA
Signature: SHA512withECDSA
Signature: NONEwithECDSAinP1363Format
Signature: SHA1withECDSAinP1363Format
Signature: SHA224withECDSAinP1363Format
Signature: SHA256withECDSAinP1363Format
Signature: SHA384withECDSAinP1363Format
Signature: SHA512withECDSAinP1363Format
KeyPairGenerator: EC
KeyAgreement: ECDH
SunJSSE Sun JSSE provider(PKCS12, SunX509/PKIX key/trust factories, SSLv3/TLSv1/TLSv1.1/TLSv1.2/DTLSv1.0/DTLSv1.2)
KeyFactory: RSA
KeyPairGenerator: RSA
Signature: MD2withRSA
Signature: MD5withRSA
Signature: SHA1withRSA
Signature: MD5andSHA1withRSA
KeyManagerFactory: SunX509
KeyManagerFactory: NewSunX509
TrustManagerFactory: SunX509
TrustManagerFactory: PKIX
SSLContext: TLSv1
SSLContext: TLSv1.1
SSLContext: TLSv1.2
SSLContext: TLS
SSLContext: DTLSv1.0
SSLContext: DTLSv1.2
SSLContext: DTLS
SSLContext: Default
KeyStore: PKCS12
SunJCE SunJCE Provider (implements RSA, DES, Triple DES, AES, Blowfish, ARCFOUR, RC2, PBE, Diffie-Hellman, HMAC)
Cipher: RSA
Cipher: DES
Cipher: DESede
Cipher: DESedeWrap
Cipher: PBEWithMD5AndDES
Cipher: PBEWithMD5AndTripleDES
Cipher: PBEWithSHA1AndDESede
Cipher: PBEWithSHA1AndRC2_40
Cipher: PBEWithSHA1AndRC2_128
Cipher: PBEWithSHA1AndRC4_40
Cipher: PBEWithSHA1AndRC4_128
Cipher: PBEWithHmacSHA1AndAES_128
Cipher: PBEWithHmacSHA224AndAES_128
Cipher: PBEWithHmacSHA256AndAES_128
Cipher: PBEWithHmacSHA384AndAES_128
Cipher: PBEWithHmacSHA512AndAES_128
Cipher: PBEWithHmacSHA1AndAES_256
Cipher: PBEWithHmacSHA224AndAES_256
Cipher: PBEWithHmacSHA256AndAES_256
Cipher: PBEWithHmacSHA384AndAES_256
Cipher: PBEWithHmacSHA512AndAES_256
Cipher: Blowfish
Cipher: AES
Cipher: AES_128/ECB/NoPadding
Cipher: AES_128/CBC/NoPadding
Cipher: AES_128/OFB/NoPadding
Cipher: AES_128/CFB/NoPadding
Cipher: AES_128/GCM/NoPadding
Cipher: AES_192/ECB/NoPadding
Cipher: AES_192/CBC/NoPadding
Cipher: AES_192/OFB/NoPadding
Cipher: AES_192/CFB/NoPadding
Cipher: AES_192/GCM/NoPadding
Cipher: AES_256/ECB/NoPadding
Cipher: AES_256/CBC/NoPadding
Cipher: AES_256/OFB/NoPadding
Cipher: AES_256/CFB/NoPadding
Cipher: AES_256/GCM/NoPadding
Cipher: AESWrap
Cipher: AESWrap_128
Cipher: AESWrap_192
Cipher: AESWrap_256
Cipher: RC2
Cipher: ARCFOUR
KeyGenerator: DES
KeyGenerator: DESede
KeyGenerator: Blowfish
KeyGenerator: AES
KeyGenerator: RC2
KeyGenerator: ARCFOUR
KeyGenerator: HmacMD5
KeyGenerator: HmacSHA1
KeyGenerator: HmacSHA224
KeyGenerator: HmacSHA256
KeyGenerator: HmacSHA384
KeyGenerator: HmacSHA512
KeyPairGenerator: DiffieHellman
AlgorithmParameterGenerator: DiffieHellman
KeyAgreement: DiffieHellman
AlgorithmParameters: DiffieHellman
AlgorithmParameters: DES
AlgorithmParameters: DESede
AlgorithmParameters: PBE
AlgorithmParameters: PBEWithMD5AndDES
AlgorithmParameters: PBEWithMD5AndTripleDES
AlgorithmParameters: PBEWithSHA1AndDESede
AlgorithmParameters: PBEWithSHA1AndRC2_40
AlgorithmParameters: PBEWithSHA1AndRC2_128
AlgorithmParameters: PBEWithSHA1AndRC4_40
AlgorithmParameters: PBEWithSHA1AndRC4_128
AlgorithmParameters: PBES2
AlgorithmParameters: PBEWithHmacSHA1AndAES_128
AlgorithmParameters: PBEWithHmacSHA224AndAES_128
AlgorithmParameters: PBEWithHmacSHA256AndAES_128
AlgorithmParameters: PBEWithHmacSHA384AndAES_128
AlgorithmParameters: PBEWithHmacSHA512AndAES_128
AlgorithmParameters: PBEWithHmacSHA1AndAES_256
AlgorithmParameters: PBEWithHmacSHA224AndAES_256
AlgorithmParameters: PBEWithHmacSHA256AndAES_256
AlgorithmParameters: PBEWithHmacSHA384AndAES_256
AlgorithmParameters: PBEWithHmacSHA512AndAES_256
AlgorithmParameters: Blowfish
AlgorithmParameters: AES
AlgorithmParameters: GCM
AlgorithmParameters: RC2
AlgorithmParameters: OAEP
KeyFactory: DiffieHellman
SecretKeyFactory: DES
SecretKeyFactory: DESede
SecretKeyFactory: PBEWithMD5AndDES
SecretKeyFactory: PBEWithMD5AndTripleDES
SecretKeyFactory: PBEWithSHA1AndDESede
SecretKeyFactory: PBEWithSHA1AndRC2_40
SecretKeyFactory: PBEWithSHA1AndRC2_128
SecretKeyFactory: PBEWithSHA1AndRC4_40
SecretKeyFactory: PBEWithSHA1AndRC4_128
SecretKeyFactory: PBEWithHmacSHA1AndAES_128
SecretKeyFactory: PBEWithHmacSHA224AndAES_128
SecretKeyFactory: PBEWithHmacSHA256AndAES_128
SecretKeyFactory: PBEWithHmacSHA384AndAES_128
SecretKeyFactory: PBEWithHmacSHA512AndAES_128
SecretKeyFactory: PBEWithHmacSHA1AndAES_256
SecretKeyFactory: PBEWithHmacSHA224AndAES_256
SecretKeyFactory: PBEWithHmacSHA256AndAES_256
SecretKeyFactory: PBEWithHmacSHA384AndAES_256
SecretKeyFactory: PBEWithHmacSHA512AndAES_256
SecretKeyFactory: PBKDF2WithHmacSHA1
SecretKeyFactory: PBKDF2WithHmacSHA224
SecretKeyFactory: PBKDF2WithHmacSHA256
SecretKeyFactory: PBKDF2WithHmacSHA384
SecretKeyFactory: PBKDF2WithHmacSHA512
Mac: HmacMD5
Mac: HmacSHA1
Mac: HmacSHA224
Mac: HmacSHA256
Mac: HmacSHA384
Mac: HmacSHA512
Mac: HmacSHA512/224
Mac: HmacSHA512/256
Mac: HmacPBESHA1
Mac: PBEWithHmacSHA1
Mac: PBEWithHmacSHA224
Mac: PBEWithHmacSHA256
Mac: PBEWithHmacSHA384
Mac: PBEWithHmacSHA512
Mac: SslMacMD5
Mac: SslMacSHA1
KeyStore: JCEKS
KeyGenerator: SunTlsPrf
KeyGenerator: SunTls12Prf
KeyGenerator: SunTlsMasterSecret
KeyGenerator: SunTlsKeyMaterial
KeyGenerator: SunTlsRsaPremasterSecret
SunJGSS Sun (Kerberos v5, SPNEGO)
GssApiMechanism: 1.2.840.113554.1.2.2
GssApiMechanism: 1.3.6.1.5.5.2
SunSASL Sun SASL provider(implements client mechanisms for: DIGEST-MD5, EXTERNAL, PLAIN, CRAM-MD5, NTLM; server mechanisms for: DIGEST-MD5, CRAM-MD5, NTLM)
SaslClientFactory: DIGEST-MD5
SaslClientFactory: NTLM
SaslClientFactory: EXTERNAL
SaslClientFactory: PLAIN
SaslClientFactory: CRAM-MD5
SaslServerFactory: CRAM-MD5
SaslServerFactory: DIGEST-MD5
SaslServerFactory: NTLM
XMLDSig XMLDSig (DOM XMLSignatureFactory; DOM KeyInfoFactory; C14N 1.0, C14N 1.1, Exclusive C14N, Base64, Enveloped, XPath, XPath2, XSLT TransformServices)
XMLSignatureFactory: DOM
KeyInfoFactory: DOM
TransformService: http://www.w3.org/TR/2001/REC-xml-c14n-20010315
TransformService: http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments
TransformService: http://www.w3.org/2006/12/xml-c14n11
TransformService: http://www.w3.org/2006/12/xml-c14n11#WithComments
TransformService: http://www.w3.org/2001/10/xml-exc-c14n#
TransformService: http://www.w3.org/2001/10/xml-exc-c14n#WithComments
TransformService: http://www.w3.org/2000/09/xmldsig#base64
TransformService: http://www.w3.org/2000/09/xmldsig#enveloped-signature
TransformService: http://www.w3.org/2002/06/xmldsig-filter2
TransformService: http://www.w3.org/TR/1999/REC-xpath-19991116
TransformService: http://www.w3.org/TR/1999/REC-xslt-19991116
SunPCSC Sun PC/SC provider
TerminalFactory: PC/SC
JdkLDAP JdkLDAP Provider (implements LDAP CertStore)
CertStore: LDAP
JdkSASL JDK SASL provider(implements client and server mechanisms for GSSAPI)
SaslClientFactory: GSSAPI
SaslServerFactory: GSSAPI
SunMSCAPI Sun's Microsoft Crypto API provider
SecureRandom: Windows-PRNG
KeyStore: Windows-MY
KeyStore: Windows-ROOT
Signature: NONEwithRSA
Signature: SHA1withRSA
Signature: SHA256withRSA
Signature: SHA384withRSA
Signature: SHA512withRSA
Signature: MD5withRSA
Signature: MD2withRSA
KeyPairGenerator: RSA
Cipher: RSA
Cipher: RSA/ECB/PKCS1Padding
SunPKCS11 Unconfigured and unusable PKCS11 provider