How to recover a RSA public key from a byte[] array?

I’m wondering if it’s possible to recover a RSA public key that I have converted to byte array previously. byte[] keyBytes = publicKey.getEncoded(); Thanks for the help. Answer PublicKey publicKey = KeyFactory.getInstance(“RSA”).generatePublic(new X509EncodedKeySpec(bytes)); For more info see this tutorial AttributionSource : Link , Question Author : kiewic , Answer Author : madth3

How long to brute force a salted SHA-512 hash? (salt provided)

Here is an algorithm in Java: public String getHash(String password, String salt) throws Exception { String input = password + salt; MessageDigest md = MessageDigest.getInstance(SHA-512); byte[] out = md.digest(input.getBytes()); return HexEncoder.toHex(out); } Assume the salt is known. I want to know the time to brute force for when the password is a dictionary word and … Read more

How to store/retrieve RSA public/private key

I want to use RSA public key encryption. What is the best way to store or retrieve private and public keys? Is XML a good idea here? How to get the keys? RSAParameters privateKey = RSA.ExportParameters(true); RSAParameters publicKey = RSA.ExportParameters(false); Because RSAParameters have the following members: D, DP, DQ, Exponent, InverseQ, Modulus, P, Q Which … Read more

SHA1 VS RSA: what’s the difference between them?

What are the differences between SHA1 and RSA? Are they just different algorithms or are they fundamentally (i.e. used for different things) different on some level. Answer Fundamentally different. SHA1 is a hash algorithm, which is a one way function, turning an input of any size into a fixed-length output (160 bit in this case). … Read more

What does tilde(~) operator do?

I recently saw the above operator in a code,I googled for it but found nothing.The code is below.Please describe what actually does this operator do? #include<stdio.h> int main() { unsigned long int i=0; char ch; char name1[20],name2[20]; FILE *fp,*ft; printf(“ENTER THE SOURCE FILE:”); gets(name1); printf(“ENTER THE DESTINATION FILE:”); gets(name2); fp=fopen(name1,”r”); ft=fopen(name2,”w”); if(fp==NULL) { printf(“CAN,T OPEN … Read more

CryptographicException “Key not valid for use in specified state.” while trying to export RSAParameters of a X509 private key

I am staring at this for quite a while and thanks to the MSDN documentation I cannot really figure out what’s going. Basically I am loading a PFX file from the disc into a X509Certificate2 and trying to encrypt a string using the public key and decrypt using the private key. Why am I puzzled: … Read more