JAVA RSA Sign Data and Verify

Simple Note

Add Sign data by Signature with Private Key and verify data by Signature with Public Key

RSAUtils.java

Also add Test Cases and Performance Testing

TestRSAUtils.java

TestRSAPerformance.java

and update the Performance Testing google sheet

JAVA RSA Performance Testing

Reference

Java Cryptography Architecture (JCA) Reference Guide
Generating and Verifying a Signature Using Generated Keys
https://docs.oracle.com/javase/8/docs/technotes/guides/security/crypto/CryptoSpec.html#SigEx

Java Doc of Signature
https://docs.oracle.com/javase/7/docs/api/java/security/Signature.html

JAVA RSA Generate KeyPair, Encryption, Decryption and Performance Testing

Motivation

To try RSA Enc/Dec and check its performance.

Simple Note

Test file TestRSAUtils.java

Implementation RSAUtils.java

Performance testing TestRSAPerformance.java

Refactoring

Move AESUtils.encrypt and AESUtils.decrypt to CryptoUtils since they are no different from RSA encrypt/decrypt.

Still wrap them in AESUtils/RSAUtils for convenience.
(Can import less class) (Just one class less)

Hmm...


Performance Testing

Test over
PublicKey/PrivateKey, Encryption/Decryption,
Create Cipher each time/Reuse Cipher,
Key Size 1024/2048/4096/8192 bits
total 32 cases, 100 runs each

Results listed in the google sheet
JAVA RSA Performance Testing

Not very accurate but...

Summary

1. PublicKey Enc/Dec is faster than PrivateKey Enc/Dec

2. Key Size affects, the longer the slower.

3. Reuse Cipher similar to create Cipher each time, sometimes even slower.

Conclusions

1. Use proper Key Size, 2048 probably a good choice.

2. Can create Cipher each time, no need to cache it.

3. Can also cache and reuse Cipher, will slightly increase performance in most cases.

References

Java: How can I generate PrivateKey from a string?

Load RSA public key from file