INNER CODE UNIT · Python
hmac_key_size
kurtbrose/pyjks · jks/bks.py:283
hmac_key_size = hmac_digest_size*8 if version != 1 else hmac_digest_size
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)