Encryption in Java

Description:

This Java code demonstrates various cryptographic techniques, including hashing and both symmetric (AES) and asymmetric (RSA) encryption. It utilizes the Java Cryptography Architecture (JCA) to perform these operations securely.

Key Components

1. SHA-512 Hashing:
   • The createSHA512Hash method generates a SHA-512 hash of a given string using the MessageDigest class.
   • The resulting hash is converted to a hexadecimal string format using the bytesToHex helper method.
2. AES Encryption and Decryption:
   • The aesEncryptionDecryption method generates a symmetric AES key using the KeyGenerator class.
   • It encrypts the input data using AES in CBC mode with PKCS5 padding.
   • The method returns the encrypted data, the base64-encoded AES key, and the initialization vector (IV) used during encryption.
3. RSA Encryption and Decryption:
   • The rsaEncryptionDecryption method generates a pair of RSA keys (public and private) using the KeyPairGenerator class.
   • It encrypts the input data with the public key using OAEP padding with SHA-512.
   • The method returns the encrypted data and the base64-encoded private key.
4. Main Method:
   • The main method demonstrates the usage of the above functions.
   • It hashes a sample string using SHA-512, encrypts a secret message using AES, and performs RSA encryption on the same message.
   • The results of each operation are printed to the console, including the SHA-512 hash, encrypted data, AES key, IV, and private key.

Example Output

When executed, the program will produce output similar to the following:

javascript

SHA-512 Hash: <hashed_value>
Encrypted data (AES): <encrypted_aes_data>
AES Key: <base64_encoded_aes_key>
AES IV: <base64_encoded_iv>
Encrypted data (RSA): <encrypted_rsa_data>
Private Key (Base64): <base64_encoded_private_key>

This output demonstrates the successful execution of hashing and encryption/decryption processes, showcasing the functionality of the cryptographic techniques implemented.

Conclusion

This Java code effectively illustrates the use of cryptographic methods for securing data through hashing and encryption. It provides a clear example of how to implement SHA-512 hashing, AES symmetric encryption, and RSA asymmetric encryption using the Java Cryptography Architecture. This code serves as a valuable reference for understanding basic cryptographic operations in Java.

Features:

1. SHA-512 Hashing:
   • The createSHA512Hash method generates a SHA-512 hash of a given string using the MessageDigest class.
   • The resulting hash is converted to a hexadecimal string format using the bytesToHex helper method.
2. AES Encryption and Decryption:
   • The aesEncryptionDecryption method generates a symmetric AES key using the KeyGenerator class.
   • It encrypts the input data using AES in CBC mode with PKCS5 padding.
   • The method returns the encrypted data, the base64-encoded AES key, and the initialization vector (IV) used during encryption.
3. RSA Encryption and Decryption:
   • The rsaEncryptionDecryption method generates a pair of RSA keys (public and private) using the KeyPairGenerator class.
   • It encrypts the input data with the public key using OAEP padding with SHA-512.
   • The method returns the encrypted data and the base64-encoded private key.
4. Main Method:
   • The main method demonstrates the usage of the above functions.
   • It hashes a sample string using SHA-512, encrypts a secret message using AES, and performs RSA encryption on the same message.
   • The results of each operation are printed to the console, including the SHA-512 hash, encrypted data, AES key, IV, and private key.

Requirements:

• Latest Java SDK
• Javac Compiler

Instructions:

For best results, use Netbeans, Eclipse or IntelliJ IDEA.