Calculating SHA-1 hashes in Java and C#

Question

Calculating SHA-1 hashes in Java and C#

I\'m trying to replicate the logic of a Java application within a C# application. Part of this involves generating an SHA-1 ha

Answer 1

your question and the answer were very useful to me, but I noticed that when the password has the character "0" hash codes generated are different, so I changed a little the code (in Java).

for (int i = 0; i < hash.length; i++)
    {
        String hex = Integer.toHexString(hash[i]);
        if (hex.length() == 1) hex = "0" + hex;
        hex = hex.substring(hex.length() - 2);
        result += hex;
    }

Answer 2

In the Java version, do not use b + 256; instead, use b & 255. The SHA-1 part is fine, this is just a matter of printing the output. Java's "byte" type is signed: it returns values between -128 and 127. To get the corresponding unsigned value, you must add 256 only if the value is negative.

A bitwise AND with 255 (that's what "& 255" does) operates the proper conversion, which, at the binary level, is truncation of the value to its 8 least significant bits.