之前，在《如何使用RSA加密JWT》介绍过使用openssl生成PCKS1格式的RSA密钥，然后再转换成PCKS8格式的密码。但是转换后去除了秘钥的密码。那如果没有去除密码，如何加载带有密码的密钥呢？Java自带的API没有找到，如果需要实现加载带密码的RSA需要用到bouncycastle库。

在百度搜索，几乎搜索不到。唯一按照关键字用Java加载加密的PCKS8PEM私钥能够搜出一些内容。但是都需要发送暗号才能查看文章内容。其实内容是如下帖子的翻译：

而且关键问题是没有输出有用的代码。

/groupIdartifactIdbcprov-jdk15on//version//groupIdartifactIdbcpkix-jdk15on//version/depency

bcprov-jdk15on和bcpkix-jdk15on是bouncycastle提供的两个加解密包

代码中有三个条件判断分支

PKCS8EncryptedPrivateKeyInfo：PCKS8格式加密密钥

PEMEncryptedKeyPair：PCKS1格式加密密钥

PEMKeyPair：PKCS1格式非加密密钥

;;;;;;;;;;;;;;;;publicclassPKCS8Main{publicstaticvoidmain(String[]args)throwsIOException,PKCSException,CertificateException{//("LoadanEncryptedPCKS8PEMPrivateKeyInJava");//youneed2bouncycastlelibraries,I'://(newBouncyCastleProvider());char[]password="aWCTJPET9fL7UBTp97hX99gdofeWKUf5tuxSuJeST2sEkyvkyinrfrj6EiSUTErF".toCharArray();StringprivKeyStrBase64Encoded="-----BEGINENCRYPTEDPRIVATEKEY-----\n"+"MIIJrTBXBgkqhkiG9w0BBQ0wSjApBgkqhkiG9w0BBQwwHAQIRZpyCAQQR8oCAggA\n"+"MAwGCCqGSIb3DQIJBQAwHQYJYIZIAWUDBAEqBBC8h4heO8aR5NaJq5o89myBBIIJ\n"+"UDo2+MIuXH+y+hB9fx1kVe7yIogh0DEeYTnTLAraeg2yudSoNLq4xF2Ftid7Ax9Q\n"+"6BwdrY6YB8/Pk9vn7gWBoTdrfUpJZZu6DtLu7URXPTN5mgRNmJzC4uAv9y+T8CRv\n"+"sLXjwYOSbF4Vsbm8JlgJPuKPKkH1lTi3t1jxik+nNrDyAXRJOYfowkW9xnGqNSxq\n"+"GEFXN1S16msrEq+chTblSpn8liY6o2Yk405qJ2G+dz/Lv50vOjoc1GTh8vNw23ER\n"+"HckRiRS8TY/sjyVtI6tZp+30azbMcXgLEHFoMDIm/bu366/aYyRI2fI76LWJUuHA\n"+"ZmU8GYU8j0+IewLPgtAXkjkTMuvrucHgCH3/ZRDDqFI+YTj3q19r4xmPGRWoxp/c\n"+"2Oex3HfUCutLonof+89I5OGfvlnaESaQcSzLJSzPV6qXGMMTFVZ6G2ZW1gfaJGC1\n"+"VwyL2k7Ejg8ncnOPKsf27oCFOflDLvfVQc/iW/XXZfFkGpO3xgoBE1CYq9y1w4VZ\n"+"gzbi88AwIV2oJTqUQkNFkDMYwPnCj/D4BAT1ipysMA3Q9gs4+EnfD9nMevtef9dR\n"+"wYaPNcnC/dy3Soacqm6VPOQ9RP77BIMNAQKlE95lsB++DXhPs3uDyxavar0pnJn2\n"+"nBfPxRGbJeVc9hxyxzQtosgkrVIIt/0nEUigTukYCESpvJAd1vsupbi6v/FGXvzg\n"+"4aU2aGTYUWcPbsi4kZUQH8ysmaPAC4QmHBPumzmeA+k4LxUaGJaWwYxCqD+WBCye\n"+"D1w1utaFTjG+HSwIqGvVTxMXZswm3Tw8+bAu5UpPeIpXejWa06duCxDkvncpOW04\n"+"En3hJuPTBEMxzCVIlYjk3Z7bNtjOayJRqxrHlY0OkHoy8BXRSN6f9O84go8S2qie\n"+"MmchFTarLfG7dir9SyDJdH2bTephRdGV3nmPLX/xza3ES4JmyHEOmYxbgqnSXsSG\n"+"8RZQ7Cg5tQVDHf1ydgyfqJ/lcG3SaehKHVuUR/Ulv8u5WpAYoxr1aGWafUtFYSoC\n"+"g/RF6E9gEbrcl/KnnPEcG5jI+86BeEsfVkpjqsh10lHG008oyeI92nXzYvZv76+d\n"+"9bshKT6qERGlA+2HYvZkNMtuwh0eUlq0sHCKQW3D7PTerfok3EP5ohiHwIZ0cME6\n"+"Jq8Dz4ORGFFAdYi86NhCkW7s4nXtP1utppaZBeZLF7nxk0XYIb3NP+a/Ll9eQQSe\n"+"WNDdv/387J++PzpygviGmZfF3rBl253cbPX/nhhNAOiPajdN2q3qDTpAnZpE3G+v\n"+"t9OnNFtgmYZ0SEOMxo8T3kMVnmUhP3OsVoWcwcqIOjwPXmwCL8c4Dju8sxfZyCQh\n"+"rRGKsbJyON+UTXA07rpH1JzqmWSQDiir75JBsLlX56yKIzKe86CWDlohbyykVkPs\n"+"vT0qTgpSvkU8N3jErjZUJsIk29uMFVcVjvR1GmMiCOIG7jZ+KefjXx43JFl6Av4w\n"+"fjdfaMb2J2/jd9suBhGDpakftZl57Qhz/FN8yDONmetJMcum5+dwxnbB9hCP7fpJ\n"+"T5tnE/w0KNFJEtXeylOHlU225czr4+gdsj+ncKiTEwIm0htulrDDgKsN74EXPcor\n"+"ywEpc3oZZMFF8084g6j0rjAnLO/fgtf0nXfMGDGUfIGo9AJFqoYKKMu5u5vQ+XY0\n"+"cc93QAB1lJ1a8yyRwfUoLHNbq2AJ9NMw1sNvkRV26dpk7ecZ8LgoUdizbztz5vb2\n"+"6VfArHvT1pZEdjgPwsQnegu4i4/ELXZWTZu2hfIM/aTgP9avAQmQDiKEnOnOQZ/3\n"+"QyFEFo5qFfH4wUKbLoQXVWslIyz7bRd+F26GoJTLPOHkPAZZ3UCCzVUHwCzc78eO\n"+"o9V4wgfVNFNkdyXi81X97v0bKKbkxfanz0+kBSDmeOUOKTDmyFOmhbC5SKLBF3k/\n"+"gNHR6BzCET7ReGZ+qIVF10Oy6SzP7M/Fmt1TU2y58CoiM3pKPDUzDYX47NCoUU6c\n"+"S8iberxh1O4mMxDNfwQmFzXe8cst8JGBxWX2O+Oqvl9EpGojWGXY9ydut//nDRPv\n"+"sQyMngcK9KLAG8/JL4hp8plKee+JtNzelCHzbjObE18waF3cveKns8WaumqpgzyT\n"+"2nX0vct0UxBeynIefaMEwT4WbsFXu/iMrRQpsrQmxlq3LLiet5lj3UdE9EiBvQox\n"+"FftQdOR8t36zNzCDnHmPzmrxggiKEjDw6BFN4sV+jm6SZWzAlypplzBHGfexYS8t\n"+"4taG0Z6lXev9xYgAcTFZrNJRVQ18c8/8W2V+LMB86LNTG7IKa8Cbo4FMPFGQhlAZ\n"+"n3URL2jaV7Cf2tTuHq0IT4Sv4/dx/Cttx8qdFjGbTt3ILCpUsh9KjxTEjteA6Ydu\n"+"e8lYsU8C5E3mdldojkie8iZHFSjrwRuk4EyUGXRoMe900CDHXmNQ3g6Cb2cE3AgM\n"+"RQvCLTQgDpQe6WJ4/HFMRXtCE3dX6P46E1968MYlgn4RAmYel1HPIh/8oWaLmwxX\n"+"IPEO/kxjybWkrvRDw8tQxVbR8D3sdurmYuMid2EpzI1OFLPp08JcpHn+9LyvBEw9\n"+"9w8ngP260HSt0rckOCyRm+JWmFRmql6LRwdWl0ht1yTASDn1+/BkQm9JfOyjMxlE\n"+"mXFdCHL8EK0+xcYn1IMypP0oG7TA0o1BK+vsmDoEO1pT3Qh4pTA2lFAoshWR9YBP\n"+"ZMW2Pyscia5+wkRuL06yAujyJP5OOmHnLp9uni8tpo4OtSqt4DRCYLM9hsB2zL6Y\n"+"3WvgavGznflve604cZ1jkJFkzg74WgwdXXn9XrI9OoEJm84avdQIdK2WlOiA5md5\n"+"lMfyMVZtCZLh/6KpC8jB4t0FlOGdoQxubslWDXcJwhPFO0KvdNv+6TeWjt8ZBECI\n"+"zRMq+jAR6yLN0gld3y4YI37cll6kr6wNYBd0NoL7Bzl/WtPn8MJTrwcRpohNqQkJ\n"+"8MOrqL14yRDvPtQ2Rijzztnd3Vb9EL0Zgkrwh9uD1ZTVDyHWHnmwW7LeBOi0/vD3\n"+"k/bi3qVGEqAc5YkCZbydMfzw0W506WsEMlysfbAhTEx+w/IV31mfD4VwpZ+ueSyE\n"+"crFUOhrrE+9a34z2mSDke3Hte1pvjhIIH6B30mjFyQh3sOoouwl9PkvbuUo8Q7v2\n"+"ojIAhmdgVMd19lfA+ihPnmalOtR7hCwdrjoHR3N5A+Ng\n"+"-----ENDENCRYPTEDPRIVATEKEY-----";PrivateKeyrsaPrivateKey=stringToPrivateKey(privKeyStrBase64Encoded,password);("privateKey:"+rsaPrivateKey);}staticpublicPrivateKeystringToPrivateKey(Strings,char[]password)throwsIOException,PKCSException{PrivateKeyInfopki;try(PEMParserpemParser=newPEMParser(newStringReader(s))){Objecto=();if(oinstanceofPKCS8EncryptedPrivateKeyInfo){//("keyinpkcs8encoding");PKCS8EncryptedPrivateKeyInfoepki=(PKCS8EncryptedPrivateKeyInfo)o;("encryptionalgorithm:"+().getAlgorithm());JcePKCSPBEInputDecryptorProviderBuilderbuilder=newJcePKCSPBEInputDecryptorProviderBuilder().setProvider("BC");InputDecryptorProvideridp=(password);pki=(idp);}elseif(oinstanceofPEMEncryptedKeyPair){//("keyinpkcs1encoding");PEMEncryptedKeyPairepki=(PEMEncryptedKeyPair)o;PEMKeyPairpkp=(newBcPEMDecryptorProvider(password));pki=();}elseif(oinstanceofPEMKeyPair){//("keyunencrypted");PEMKeyPairpkp=(PEMKeyPair)o;pki=();}else{thrownewPKCSException("Invalidencryptedprivatekeyclass:"+().getName());}JcaPEMKeyConverterconverter=newJcaPEMKeyConverter().setProvider("BC");(pki);}}}