INNER CODE UNIT · Python

hmac_key

kurtbrose/pyjks · jks/bks.py:284

            hmac_key = rfc7292.derive_key(hmac_fn, rfc7292.PURPOSE_MAC_MATERIAL, store_password, salt, iteration_count, hmac_key_size//8)

            store_data = data[pos:pos+size]
            store_hmac = data[pos+size:pos+size+hmac_digest_size]
            if len(store_hmac) != hmac_digest_size:
                raise BadKeystoreFormatException("Bad HMAC size; found %d bytes, expected %d bytes" % (len(store_hmac), hmac_digest_size))

            hmac = HMAC.new(hmac_key, digestmod=SHA)
            hmac.update(store_data)

            computed_hmac = hmac.digest()
            if store_hmac != computed_hmac:
                raise KeystoreSignatureException("Hash mismatch; incorrect keystore password?")
            return cls(store_type, entries, version=version)

        except struct.error as e:
            raise BadKeystoreFormatException(e)

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