(2) Else if you have or can get openssl commandline, write the PKCS8 from Java in correct 'PEM' which is base64 with linebreaks at 19 groups (76 chars) or less and header and trailer for type PRIVATE KEY (NOT RSA PRIVATE KEY also not ENCRYPTED PRIVATE KEY), then run that through openssl rsa (NOT openssl pkey) to convert to legacy, and read that. 2016-9-1 //下面代码是直接读取文件来进行加密解密，算法文件package Test;import javaxJava 本文主要讲解在APP上如何实现双向RSA + AES加密。先上一张主要流程图：场景预设：由于客户端是APP而不是网页，APP在第一次加载的时候会生成一对RSA秘钥.
This chapter demonstrates how to generate an RSA based OpenPGP key pair with OpenPGP Library for Java.
When we create an OpenPGP key pair, a few parameters must be passed. These include:
- Encryption key size in bytes (recommended between 1024 and 3072)
- User ID
- key algorithm (RSA or ELGAMAL)
- private key password
- list of preferred compression algorithms
- list of preferred signature hash algorithms
- list of preferred symmetric encryption algorithms
- key expiration date (optional)
One note regarding the naming convention for the User ID parameter. The original PGP(r) software is delimiting the email in the User ID with < and > like : “Richard C. <richard.c@site.com>”
An overloaded method exists that accepts key expiration date as a last parameter.
Table of Contents
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1. Key generation with a KeyStore
2. Key generation directly
3. Exception handling
Openssl generate rsa private key. If this argument is not specified then standard output isused.This specifies the output format DER or PEM.the output file password source. For more information about the format of argsee the PASS PHRASE ARGUMENTS section in.This option encrypts the private key with the supplied cipher.
1. Key generation example
https://syngdelondo.tistory.com/2. After the key pair is generated usually we will export the public key and send it to our partners.
I ready app for mac. Below is a screenshot of the generated key properties when we open it with PGP (r) 10:
2. Key generation directly
We can avoid the use of a KeyStore class and generate a key pair in the memory in a PGPKeyPair object. In that case we also have to export it afterwards.
3. Exception Handling
Java Generate Rsa Key Pair
The key pair generation methods simply throw com.didisoft.pgp.PGPException in case the key generation fails.
Summary
This chapter demonstrated how to generate an RSA OpenPGP key pair with DidiSoft OpenPGP Library for Java.
Java Generate Rsa 2048 Key Code
| importjavax.crypto.Cipher; |
| importjava.security.*; |
| importjava.security.spec.PKCS8EncodedKeySpec; |
| importjava.security.spec.X509EncodedKeySpec; |
| importjava.util.Base64; |
| importjava.util.Scanner; |
| publicclassRSAKeyGenMain { |
| privatestaticBase64.Encoder encoder =Base64.getEncoder(); |
| privatestaticBase64.Decoder decoder =Base64.getDecoder(); |
| publicstaticvoidmain(String[] args) throwsException { |
| introBOT(); |
| } |
| privatestaticvoidintroBOT() throwsException { |
| try { |
| System.out.println('Hi! Do you want to generate a pair of RSA Keys ? (Y/n)'); |
| Scanner s =newScanner(System.in); |
| String str = s.nextLine(); |
| if (str.toLowerCase().equals('y')) { |
| // generate public and private keys |
| KeyPair keyPair = buildKeyPair(); |
| PublicKey pubKey = keyPair.getPublic(); |
| PrivateKey privateKey = keyPair.getPrivate(); |
| } else { |
| System.out.println('Do you want to Encrypt or Decrypt a message ? (E/d)'); |
| s =newScanner(System.in); |
| str = s.nextLine(); |
| System.out.println('Please enter the message : '); |
| s =newScanner(System.in); |
| String message = s.nextLine(); |
| if (str.toLowerCase().equals('x')) { |
| System.out.println('Please enter your public key: '); |
| s =newScanner(System.in); |
| String publicKey = s.nextLine(); |
| // decrypt the message |
| byte[] secret = decrypt(getPublicKey(publicKey), decoder.decode(message)); |
| System.out.println(newString(secret)); // This is a secret message |
| } elseif (str.toLowerCase().equals('e')) { |
| System.out.println('Please enter your public key: '); |
| s =newScanner(System.in); |
| String publicKey = s.nextLine(); |
| // encrypt the message |
| byte[] encrypted = pubEncrypt(getPublicKey(publicKey), message); |
| System.out.println(encoder.encodeToString(encrypted)); |
| } else { |
| System.out.println('Please enter your private key:'); |
| s =newScanner(System.in); |
| String privateKey = s.nextLine(); |
| // decrypt the message |
| byte[] secret = pubDecrypt(getPrivateKey(privateKey), decoder.decode(message)); |
| System.out.println(newString(secret)); // This is a secret message |
| } |
| } |
| } catch (Exception ex) { |
| } finally { |
| System.out.println('Do you want to Quit or Continue ? (C/q) '); |
| Scanner s =newScanner(System.in); |
| String qc = s.nextLine(); |
| if (qc.toLowerCase().equals('q')) { |
| System.out.println('Thank you ! :)'); |
| } else { |
| introBOT(); |
| } |
| } |
| } |
| publicstaticKeyPairbuildKeyPair() throwsNoSuchAlgorithmException { |
| finalint keySize =2048; |
| KeyPairGenerator keyPairGenerator =KeyPairGenerator.getInstance('RSA'); |
| keyPairGenerator.initialize(keySize); |
| KeyPair keyPair = keyPairGenerator.genKeyPair(); |
| System.out.println('Private : '+ encoder.encodeToString(keyPair.getPrivate().getEncoded())); |
| System.out.println('Public : '+ encoder.encodeToString(keyPair.getPublic().getEncoded())); |
| return keyPair; |
| } |
| publicstaticbyte[] pubEncrypt(PublicKeypublicKey, Stringmessage) throwsException { |
| Cipher cipher =Cipher.getInstance('RSA'); |
| cipher.init(Cipher.ENCRYPT_MODE, publicKey); |
| return cipher.doFinal(message.getBytes()); |
| } |
| publicstaticbyte[] pubDecrypt(PrivateKeyprivateKey, byte[] encrypted) throwsException { |
| Cipher cipher =Cipher.getInstance('RSA'); |
| cipher.init(Cipher.DECRYPT_MODE, privateKey); |
| return cipher.doFinal(encrypted); |
| } |
| publicstaticbyte[] encrypt(PrivateKeyprivateKey, Stringmessage) throwsException { |
| Cipher cipher =Cipher.getInstance('RSA'); |
| cipher.init(Cipher.ENCRYPT_MODE, privateKey); |
| return cipher.doFinal(message.getBytes()); |
| } |
| publicstaticbyte[] decrypt(PublicKeypublicKey, byte[] encrypted) throwsException { |
| Cipher cipher =Cipher.getInstance('RSA'); |
| cipher.init(Cipher.DECRYPT_MODE, publicKey); |
| return cipher.doFinal(encrypted); |
| } |
| publicstaticPrivateKeygetPrivateKey(StringprivateKey) |
| throwsException { |
| byte[] keyBytes = decoder.decode(privateKey.getBytes()); |
| PKCS8EncodedKeySpec spec = |
| newPKCS8EncodedKeySpec(keyBytes); |
| KeyFactory kf =KeyFactory.getInstance('RSA'); |
| return kf.generatePrivate(spec); |
| } |
| publicstaticPublicKeygetPublicKey(StringpublicKey) |
| throwsException { |
| byte[] keyBytes = decoder.decode(publicKey.getBytes()); |
| X509EncodedKeySpec spec = |
| newX509EncodedKeySpec(keyBytes); |
| KeyFactory kf =KeyFactory.getInstance('RSA'); |
| return kf.generatePublic(spec); |
| } |
| } |