Can two different BASE64 encoded strings result into same string if decoded?

Question

On client side I am doing an MD5 encryption of a string and then a BASE 64 encoding on the hash generated.

This final encoded string is then used for comparison on serve

Answer 1

You have the MD5 Hash 291423A531148527A9524EA0924CDF68 that generates the Base64 encoded string MjkxNDIzQTUzMTE0ODUyN0E5NTI0RUEwOTI0Q0RGNjg= , which is fine. You have converted the MD5 hash to an ascii hex representation, and base64 encoded that.

However your own getHashCode() works differently, it creates a base64 encoding of the binary representation of your hash code, you have not converted your hash to an ascii hex representation, and that's why you see different base64 encoded strings.