protected ByteSource convertSaltToBytes(Object salt) {
        return toByteSource(salt);
    }
Acquires the specified {@code salt} argument's bytes and returns them in the form of a {@code ByteSource} instance.
<p/>
This implementation merely delegates to the convenience {@link #toByteSource(Object)} method for generic
conversion.  Can be overridden by subclasses for salt-specific conversion.

@param salt the salt to be use for the hash.
@return the salt's bytes in the form of a {@code ByteSource} instance.
@since 1.2
crypto/hash/src/main/java/org/apache/shiro/crypto/hash/SimpleHash.java