Firstly, apologies for the amount of code I’m about to post. I’m trying to use the RSA public key from my Java application to encrypt a message in an Android app, and then send the ciphertext back to a Java environment for decryption, but upon attempting to decrypt I always get this error: The ciphertext does contain the correct number
Tag: rsa
How to make “MessageDigest SHA-1 and Signature NONEwithRSA” equivalent to “Signature SHA1withRSA “
I am interested in applying a SHA-1 hash with RSA signature to some data, but I need to do it in two steps – apply hash first and then sign the data. The Signature.sign() function appears to create a more complex (ASN.1?) data structure that is ultimately signed (see this question). How can I make the two equivalent without using
Load RSA public key from file
I’ve generated a private key with: After this I’ve generated a public key with: I want to sign some messages with my private key, and verify some other messages with my public key, using code like this: I found a solution to convert my private key to PKCS8 format and load it. It works with some code like this: And
RSA in bouncycastle for java – How is ciphertext randomization gained?
I´m acutally using bouncycastle library for my applications RSA crypto. My question is: When I encrypt one plaintext two times using the same key, It will lead to two different ciphertexts, so there has to be some kind of randomization in bouncycastles implementation (RSA itself is not randomized, so enc(a, k) is always the same). Can anyone please tell me,
Generate RSA key pair and encode public as string
I want to generate 512 bit RSA keypair and then encode my public key as a string. How can I achieve this? Answer For output as Hex-String For output as byte values