Problem with sha-256 digest: missing zeros!
Hi, I'm doing a "Digest" sha-256, leave a string, it's that in the digest resulting some zeros are missing!Digest itself is not wrong: other characters are very well... for example, let's say I had a string like this:
'64C6DDE3E579B6D986968D3445D23B15CAAF128402AC560005CE2075913FDCE8363739303358303038323339330025532682B1 '.
Correct sha256 digest would be:
'0986d134680fa055c32f86738ad67108c8028a2ea6fc31d5d64b5c8e43901f42 '.
but I get
'986d13468fa055c32f86738ad6718c828a2ea6fc31d5d64b5c8e43901f42 '.
Here is my code:
String beforeHash = aString; //each couple of chars is a hex number so ...
byte b[] = (new BigInteger(beforeHash,16)).toByteArray();
String result = getHash(b);
System.out.println(result);
public String getHash(byte[] passwd) throws NoSuchAlgorithmException{
MessageDigest msg = MessageDigest.getInstance("SHA-256");
msg.reset();
byte output[] = null;
msg.update(passwd);
output = msg.digest();
StringBuffer hexString = new StringBuffer();
for(int i=0;i<input.length;i++)
hexString.append(Integer.toHexString(0xFF & output));
return hexString.toString();
}
Not a problem in Cryptography. Integer.hexString () does not preserve the leading zeros. Change to use String.format("%02X",v) or use one of the free hexagonal encoders.
Tags: Java
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