90 questions
1
vote
0
answers
60
views
Java encrypt a zip file then decrypt with openssl
The goal is to be able to encrypt a Zip file in Java, and decrypt it elsewhere using openssl or Python.
I use the following to (hopefully) encrypt a ZIP file in Java, cobbled together from a couple ...
- 4,004
1
vote
1
answer
79
views
Decrypt Java produced AES file with openssl
The following Java produces encryoted data:
private static final int KEY_LENGTH = 256;
private static final int ITERATION_COUNT = 65536;
public static String encrypt(String strToEncrypt, String ...
- 4,004
1
vote
1
answer
55
views
Decrypt a Java encrypted file in Python
I use the following to encrypt a file in Java:
public static byte[] hexStringToByteArray(String s) {
int len = s.length();
byte[] data = new byte[len / 2];
for (int i = 0; i <...
- 419
1
vote
2
answers
303
views
java Cannot find any provider supporting Serpent/CTR/NoPadding
sshj logs
Cannot find any provider supporting CAST5/CTR/NoPadding
Cannot find any provider supporting IDEA/CTR/NoPadding
Cannot find any provider supporting Serpent/CBC/NoPadding
Cannot find any ...
- 2,664
1
vote
2
answers
472
views
javax.crypto - Cipher objects - How does the Provider Service work?
I am trying to find the implementations of the source code.
For example, if I initialize the Cipher-object like this:
Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding");
how can I find ...
- 35
0
votes
1
answer
77
views
BadPaddingException when reading CipherInputStream during decryption
I'm new to Java cryptography and don't know why I keep getting BadPaddingException when attempting to decrypt a file that I have successfully encrypted, using the same key and IV for both. I am adding ...
- 3
2
votes
1
answer
190
views
Migrate java decryption from openssl (>1.1.1 with -md sha256) to (<1.1.1 with --pbkdf2) doesn't work
I am migrating a java code that encrypts and decrypts messages just as openssl below 1.1.1 with this command :
echo -n "password" | openssl enc -aes-256-cbc -a -k secretKey -md sha256
This ...
- 169
0
votes
1
answer
812
views
javax.crypto.IllegalBlockSizeException: Input length not multiple of 16 bytes - AES_256/CBC/NoPadding
I am trying to decrypt an AES cipher in Java. The cipher was encrypted/decrypted in PHP using the openssl_encrypt/openssl_decrypt function.
An example of decryption in PHP looks like this:
function ...
1
vote
0
answers
51
views
Is there a class containing statics for algorithm names/modes/paddings?
If I needed to reference an encoding, like UTF-8, I'd typically reference the StandardCharset.UTF-8 static, not use a String literal "UTF-8".
When working with cipher transformations, I see ...
- 167
2
votes
1
answer
2k
views
Generating key from password without salt
Java has a convinient class PBEKeySpec that lets you generate a secret key from a password using values of iteration count, key length and salt for decryption purposes. See the example below.
private ...
- 31
0
votes
0
answers
494
views
Is it possible to use javax.crypto.Cipher RSA 1024 to decrypt the message with the public key? Maybe public key can be used for encryption only?
I have Delphi client/software suite that uses RSA 1024 private and public keys in the following protocol (client has public key, server has private key):
client generates string A and encrypts it ...
- 3,276
1
vote
1
answer
787
views
How to configure Android RSA key generation (or key use) so that it works like Delphi TurboPower Lockbox 2 RSA key generation/use?
I have the following code for Delphi 10.2 TurboPower LockBox 2 RSA keys generation and their represenation as some string:
//Object properties
object LbRSA1024: TLbRSA
PrimeTestIterations = 20
...
- 3,276
0
votes
0
answers
66
views
How can I use javax.crypto to encrypt images?
I need a program that could encrypt images, and after a somewhat brief amount of research I stumbled upon the javax.crypto library. I need it be absolutely secure. Could I use this library, and if ...
- 123
0
votes
0
answers
1k
views
Python equivalent to java encryption
In my company, we have java class for encrypt/decrypt-ing small strings such as passwords.
Running the java code through a debugger, I can get the encrypted string, and the decrypted string. I then ...
- 167
1
vote
0
answers
121
views
Why does PBEWithMD5AndDES mess up encryption in parallelStream in Java?
I am working in a Spring Boot project where we use the PBEWithMD5AndDES encryption algorithm. We use the
javax.crypto.Cipher class library like the code below. When we process single requests it works ...
- 41