184 lines
6.8 KiB
Python
184 lines
6.8 KiB
Python
# test_aesgcmstream.py
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#
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# Copyright (C) 2022 wolfSSL Inc.
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#
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# This file is part of wolfSSL. (formerly known as CyaSSL)
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#
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# wolfSSL is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# wolfSSL is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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# pylint: disable=redefined-outer-name
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from wolfcrypt._ffi import lib as _lib
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if _lib.AESGCM_STREAM_ENABLED:
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import pytest
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from wolfcrypt.utils import t2b
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from wolfcrypt.exceptions import WolfCryptError
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from binascii import hexlify as b2h
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from wolfcrypt.ciphers import AesGcmStream
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def test_encrypt():
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key = "fedcba9876543210"
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iv = "0123456789abcdef"
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gcm = AesGcmStream(key, iv)
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buf = gcm.encrypt("hello world")
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authTag = gcm.final()
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assert b2h(authTag) == bytes('ac8fcee96dc6ef8e5236da19b6197d2e', 'utf-8')
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assert b2h(buf) == bytes('5ba7d42e1bf01d7998e932', "utf-8")
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gcmdec = AesGcmStream(key, iv)
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bufdec = gcmdec.decrypt(buf)
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gcmdec.final(authTag)
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assert bufdec == t2b("hello world")
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def test_encrypt_short_tag():
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key = "fedcba9876543210"
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iv = "0123456789abcdef"
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gcm = AesGcmStream(key, iv, 12)
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buf = gcm.encrypt("hello world")
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authTag = gcm.final()
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assert b2h(authTag) == bytes('ac8fcee96dc6ef8e5236da19', 'utf-8')
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assert b2h(buf) == bytes('5ba7d42e1bf01d7998e932', "utf-8")
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gcmdec = AesGcmStream(key, iv, 12)
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bufdec = gcmdec.decrypt(buf)
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gcmdec.final(authTag)
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assert bufdec == t2b("hello world")
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def test_multipart():
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key = "fedcba9876543210"
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iv = "0123456789abcdef"
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gcm = AesGcmStream(key, iv)
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buf = gcm.encrypt("hello")
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buf += gcm.encrypt(" world")
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authTag = gcm.final()
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assert b2h(authTag) == bytes('ac8fcee96dc6ef8e5236da19b6197d2e', 'utf-8')
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assert b2h(buf) == bytes('5ba7d42e1bf01d7998e932', "utf-8")
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gcmdec = AesGcmStream(key, iv)
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bufdec = gcmdec.decrypt(buf[:5])
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bufdec += gcmdec.decrypt(buf[5:])
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gcmdec.final(authTag)
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assert bufdec == t2b("hello world")
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def test_encrypt_aad():
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key = "fedcba9876543210"
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iv = "0123456789abcdef"
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aad = "aad data"
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gcm = AesGcmStream(key, iv)
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gcm.set_aad(aad)
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buf = gcm.encrypt("hello world")
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authTag = gcm.final()
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print(b2h(authTag))
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assert b2h(authTag) == bytes('8f85338aa0b13f48f8b17482dbb8acca', 'utf-8')
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assert b2h(buf) == bytes('5ba7d42e1bf01d7998e932', "utf-8")
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gcmdec = AesGcmStream(key, iv)
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gcmdec.set_aad(aad)
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bufdec = gcmdec.decrypt(buf)
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gcmdec.final(authTag)
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assert bufdec == t2b("hello world")
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def test_multipart_aad():
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key = "fedcba9876543210"
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iv = "0123456789abcdef"
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aad = "aad data"
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gcm = AesGcmStream(key, iv)
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gcm.set_aad(aad)
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buf = gcm.encrypt("hello")
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buf += gcm.encrypt(" world")
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authTag = gcm.final()
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assert b2h(authTag) == bytes('8f85338aa0b13f48f8b17482dbb8acca', 'utf-8')
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assert b2h(buf) == bytes('5ba7d42e1bf01d7998e932', "utf-8")
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gcmdec = AesGcmStream(key, iv)
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gcmdec.set_aad(aad)
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bufdec = gcmdec.decrypt(buf[:5])
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bufdec += gcmdec.decrypt(buf[5:])
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gcmdec.final(authTag)
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assert bufdec == t2b("hello world")
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def test_encrypt_aad_bad():
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key = "fedcba9876543210"
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iv = "0123456789abcdef"
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aad = "aad data"
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aad_bad = "bad data"
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gcm = AesGcmStream(key, iv)
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gcm.set_aad(aad)
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buf = gcm.encrypt("hello world")
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authTag = gcm.final()
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print(b2h(authTag))
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assert b2h(authTag) == bytes('8f85338aa0b13f48f8b17482dbb8acca', 'utf-8')
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assert b2h(buf) == bytes('5ba7d42e1bf01d7998e932', "utf-8")
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gcmdec = AesGcmStream(key, iv)
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gcmdec.set_aad(aad_bad)
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gcmdec.decrypt(buf)
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with pytest.raises(WolfCryptError):
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gcmdec.final(authTag)
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def test_invalid_tag_bytes():
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key = "fedcba9876543210"
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iv = "0123456789abcdef"
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# Out of range
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with pytest.raises(ValueError, match="tag_bytes must be one of"):
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AesGcmStream(key, iv, tag_bytes=0)
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with pytest.raises(ValueError, match="tag_bytes must be one of"):
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AesGcmStream(key, iv, tag_bytes=3)
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with pytest.raises(ValueError, match="tag_bytes must be one of"):
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AesGcmStream(key, iv, tag_bytes=17)
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# Non-NIST sizes within 4-16 range
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for bad in (5, 6, 7, 9, 10, 11):
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with pytest.raises(ValueError, match="tag_bytes must be one of"):
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AesGcmStream(key, iv, tag_bytes=bad)
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# Valid NIST sizes: verify the resulting tag has the requested length.
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for good in (4, 8, 12, 13, 14, 15, 16):
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gcm = AesGcmStream(key, iv, tag_bytes=good)
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gcm.encrypt("hello world")
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tag = gcm.final()
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assert len(tag) == good
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def test_decrypt_rejects_wrong_tag_length():
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key = "fedcba9876543210"
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iv = "0123456789abcdef"
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gcm = AesGcmStream(key, iv, tag_bytes=16)
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buf = gcm.encrypt("hello world")
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authTag = gcm.final()
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assert len(authTag) == 16
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# Truncated tag: would silently lower the verification window to
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# 32-bit forgery probability without this check.
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gcmdec = AesGcmStream(key, iv, tag_bytes=16)
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gcmdec.decrypt(buf)
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with pytest.raises(ValueError, match="authTag must be 16 bytes"):
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gcmdec.final(authTag[:4])
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# Over-long tag is also rejected.
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gcmdec2 = AesGcmStream(key, iv, tag_bytes=16)
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gcmdec2.decrypt(buf)
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with pytest.raises(ValueError, match="authTag must be 16 bytes"):
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gcmdec2.final(authTag + b"\x00")
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# Happy path with the configured length still verifies.
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gcmdec3 = AesGcmStream(key, iv, tag_bytes=16)
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plain = gcmdec3.decrypt(buf)
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gcmdec3.final(authTag)
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assert plain == t2b("hello world")
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def test_repeated_construction_destruction():
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import gc
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key = "fedcba9876543210"
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iv = "0123456789abcdef"
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for _ in range(1000):
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gcm = AesGcmStream(key, iv)
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gcm.encrypt("hello world")
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gcm.final()
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del gcm
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gc.collect()
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