I know how to generate rsa keys and encrypt an decrypt. My question what the difference is between a Java generated rsa key and a rsa key generated with openssh. Is there a way to convert this key in java? – Ralph Oct 23 '13 at 6:33.
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- Rsa Algorithm For Key Generation And Cipher Verification In Java Download
- Rsa Algorithm For Key Generation And Cipher Verification In Java Pdf
- Rsa Algorithm For Key Generation And Cipher Verification In Java 10
Rsa Algorithm For Key Generation And Cipher Verification In Java Download
| importjavax.crypto.Cipher; |
| importjava.io.InputStream; |
| importjava.security.*; |
| importjava.util.Base64; |
| import staticjava.nio.charset.StandardCharsets.UTF_8; |
| publicclassRsaExample { |
| publicstaticKeyPairgenerateKeyPair() throwsException { |
| KeyPairGenerator generator =KeyPairGenerator.getInstance('RSA'); |
| generator.initialize(2048, newSecureRandom()); |
| KeyPair pair = generator.generateKeyPair(); |
| return pair; |
| } |
| publicstaticKeyPairgetKeyPairFromKeyStore() throwsException { |
| //Generated with: |
| // keytool -genkeypair -alias mykey -storepass s3cr3t -keypass s3cr3t -keyalg RSA -keystore keystore.jks |
| InputStream ins =RsaExample.class.getResourceAsStream('/keystore.jks'); |
| KeyStore keyStore =KeyStore.getInstance('JCEKS'); |
| keyStore.load(ins, 's3cr3t'.toCharArray()); //Keystore password |
| KeyStore.PasswordProtection keyPassword =//Key password |
| newKeyStore.PasswordProtection('s3cr3t'.toCharArray()); |
| KeyStore.PrivateKeyEntry privateKeyEntry = (KeyStore.PrivateKeyEntry) keyStore.getEntry('mykey', keyPassword); |
| java.security.cert.Certificate cert = keyStore.getCertificate('mykey'); |
| PublicKey publicKey = cert.getPublicKey(); |
| PrivateKey privateKey = privateKeyEntry.getPrivateKey(); |
| returnnewKeyPair(publicKey, privateKey); |
| } |
| publicstaticStringencrypt(StringplainText, PublicKeypublicKey) throwsException { |
| Cipher encryptCipher =Cipher.getInstance('RSA'); |
| encryptCipher.init(Cipher.ENCRYPT_MODE, publicKey); |
| byte[] cipherText = encryptCipher.doFinal(plainText.getBytes(UTF_8)); |
| returnBase64.getEncoder().encodeToString(cipherText); |
| } |
| publicstaticStringdecrypt(StringcipherText, PrivateKeyprivateKey) throwsException { |
| byte[] bytes =Base64.getDecoder().decode(cipherText); |
| Cipher decriptCipher =Cipher.getInstance('RSA'); |
| decriptCipher.init(Cipher.DECRYPT_MODE, privateKey); |
| returnnewString(decriptCipher.doFinal(bytes), UTF_8); |
| } |
| publicstaticStringsign(StringplainText, PrivateKeyprivateKey) throwsException { |
| Signature privateSignature =Signature.getInstance('SHA256withRSA'); |
| privateSignature.initSign(privateKey); |
| privateSignature.update(plainText.getBytes(UTF_8)); |
| byte[] signature = privateSignature.sign(); |
| returnBase64.getEncoder().encodeToString(signature); |
| } |
| publicstaticbooleanverify(StringplainText, Stringsignature, PublicKeypublicKey) throwsException { |
| Signature publicSignature =Signature.getInstance('SHA256withRSA'); |
| publicSignature.initVerify(publicKey); |
| publicSignature.update(plainText.getBytes(UTF_8)); |
| byte[] signatureBytes =Base64.getDecoder().decode(signature); |
| return publicSignature.verify(signatureBytes); |
| } |
| publicstaticvoidmain(String. argv) throwsException { |
| //First generate a public/private key pair |
| KeyPair pair = generateKeyPair(); |
| //KeyPair pair = getKeyPairFromKeyStore(); |
| //Our secret message |
| String message ='the answer to life the universe and everything'; |
| //Encrypt the message |
| String cipherText = encrypt(message, pair.getPublic()); |
| //Now decrypt it |
| String decipheredMessage = decrypt(cipherText, pair.getPrivate()); |
| System.out.println(decipheredMessage); |
| //Let's sign our message |
| String signature = sign('foobar', pair.getPrivate()); |
| //Let's check the signature |
| boolean isCorrect = verify('foobar', signature, pair.getPublic()); |
| System.out.println('Signature correct: '+ isCorrect); |
| } |
| } |
commented Oct 17, 2019
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commented Nov 26, 2019
Jomonte suvisheshangal full movie download torrent. Thanks for the code. One issue - using Debian putty generate ssh key. To create and use SSH keys on Windows, you need to download and install both PuTTY, the utility used to connect to remote servers through SSH, and PuTTYgen, a utility used to create SSH keys. On the PuTTY website, download the.msi file in the Package files section at the top of the page, under MSI (‘Windows Installer’). Puttygen is the SSH key generation tool for the linux version of PuTTY. It works similarly to the ssh-keygen tool in OpenSSH. The basic function is to create public and private key pairs. PuTTY stores keys in its own format in.ppk files. However, the tool can also convert key formats. Jul 19, 2013 PuTTY Key Generator (a.k.a. PuTTYgen) While PuTTY is a client program for SSH (in addition to Telnet and Rlogin), it is not a port of or otherwise based on OpenSSH. Consequently, PuTTY does not have native support for reading OpenSSH's SSH-2 private key files. However, PuTTY does have a companion named PuTTYgen. PuTTYgen is an key generator tool for creating SSH keys for PuTTY. It is analogous to the ssh-keygen tool used in some other SSH implementations. The basic function is to create public and private key pairs. PuTTY stores keys in its own format in.ppk files. However, the tool can also convert keys to and from other formats. |
commented Dec 29, 2019
Rsa Algorithm For Key Generation And Cipher Verification In Java Pdf
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Rsa Algorithm For Key Generation And Cipher Verification In Java 10