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106 lines
4.3 KiB
106 lines
4.3 KiB
From 8dbe0dc3eea5c689d4f76b37b93fe216cf1f00d4 Mon Sep 17 00:00:00 2001 |
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From: Legrandin <helderijs@gmail.com> |
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Date: Sun, 22 Dec 2013 22:24:46 +0100 |
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Subject: [PATCH] Throw exception when IV is used with ECB or CTR |
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The IV parameter is currently ignored when initializing |
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a cipher in ECB or CTR mode. |
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For CTR mode, it is confusing: it takes some time to see |
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that a different parameter is needed (the counter). |
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For ECB mode, it is outright dangerous. |
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This patch forces an exception to be raised. |
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--- |
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lib/Crypto/SelfTest/Cipher/common.py | 31 +++++++++++++++++++++++-------- |
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src/block_template.c | 11 +++++++++++ |
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2 files changed, 34 insertions(+), 8 deletions(-) |
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diff --git a/lib/Crypto/SelfTest/Cipher/common.py b/lib/Crypto/SelfTest/Cipher/common.py |
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index 420b6ff..a5f8a88 100644 |
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--- a/lib/Crypto/SelfTest/Cipher/common.py |
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+++ b/lib/Crypto/SelfTest/Cipher/common.py |
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@@ -239,16 +239,30 @@ class RoundtripTest(unittest.TestCase): |
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return """%s .decrypt() output of .encrypt() should not be garbled""" % (self.module_name,) |
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def runTest(self): |
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- for mode in (self.module.MODE_ECB, self.module.MODE_CBC, self.module.MODE_CFB, self.module.MODE_OFB, self.module.MODE_OPENPGP): |
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+ |
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+ ## ECB mode |
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+ mode = self.module.MODE_ECB |
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+ encryption_cipher = self.module.new(a2b_hex(self.key), mode) |
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+ ciphertext = encryption_cipher.encrypt(self.plaintext) |
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+ decryption_cipher = self.module.new(a2b_hex(self.key), mode) |
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+ decrypted_plaintext = decryption_cipher.decrypt(ciphertext) |
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+ self.assertEqual(self.plaintext, decrypted_plaintext) |
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+ |
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+ ## OPENPGP mode |
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+ mode = self.module.MODE_OPENPGP |
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+ encryption_cipher = self.module.new(a2b_hex(self.key), mode, self.iv) |
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+ eiv_ciphertext = encryption_cipher.encrypt(self.plaintext) |
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+ eiv = eiv_ciphertext[:self.module.block_size+2] |
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+ ciphertext = eiv_ciphertext[self.module.block_size+2:] |
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+ decryption_cipher = self.module.new(a2b_hex(self.key), mode, eiv) |
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+ decrypted_plaintext = decryption_cipher.decrypt(ciphertext) |
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+ self.assertEqual(self.plaintext, decrypted_plaintext) |
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+ |
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+ ## All other non-AEAD modes (but CTR) |
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+ for mode in (self.module.MODE_CBC, self.module.MODE_CFB, self.module.MODE_OFB): |
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encryption_cipher = self.module.new(a2b_hex(self.key), mode, self.iv) |
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ciphertext = encryption_cipher.encrypt(self.plaintext) |
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- |
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- if mode != self.module.MODE_OPENPGP: |
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- decryption_cipher = self.module.new(a2b_hex(self.key), mode, self.iv) |
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- else: |
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- eiv = ciphertext[:self.module.block_size+2] |
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- ciphertext = ciphertext[self.module.block_size+2:] |
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- decryption_cipher = self.module.new(a2b_hex(self.key), mode, eiv) |
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+ decryption_cipher = self.module.new(a2b_hex(self.key), mode, self.iv) |
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decrypted_plaintext = decryption_cipher.decrypt(ciphertext) |
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self.assertEqual(self.plaintext, decrypted_plaintext) |
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diff --git a/src/block_template.c b/src/block_template.c |
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index f940e0e..d555ceb 100644 |
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--- a/src/block_template.c |
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+++ b/src/block_template.c |
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@@ -170,6 +170,17 @@ ALGnew(PyObject *self, PyObject *args, PyObject *kwdict) |
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"Key cannot be the null string"); |
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return NULL; |
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} |
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+ if (IVlen != 0 && mode == MODE_ECB) |
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+ { |
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+ PyErr_Format(PyExc_ValueError, "ECB mode does not use IV"); |
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+ return NULL; |
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+ } |
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+ if (IVlen != 0 && mode == MODE_CTR) |
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+ { |
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+ PyErr_Format(PyExc_ValueError, |
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+ "CTR mode needs counter parameter, not IV"); |
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+ return NULL; |
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+ } |
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if (IVlen != BLOCK_SIZE && mode != MODE_ECB && mode != MODE_CTR) |
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{ |
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PyErr_Format(PyExc_ValueError, |
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From 58de28a5d32bc10e15766e5a59f41b07397cc6cb Mon Sep 17 00:00:00 2001 |
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From: Richard Mitchell <richard.j.mitchell@gmail.com> |
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Date: Mon, 28 Apr 2014 16:58:27 +0100 |
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Subject: [PATCH] Fix speedtest run for ECB modes. |
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--- |
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pct-speedtest.py | 2 ++ |
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1 file changed, 2 insertions(+) |
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diff --git a/pct-speedtest.py b/pct-speedtest.py |
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index 4ce18be..c7b893a 100644 |
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--- a/pct-speedtest.py |
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+++ b/pct-speedtest.py |
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@@ -121,6 +121,8 @@ class Benchmark: |
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blocks = self.random_blocks(16384, 1000) |
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if mode is None: |
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cipher = module.new(key) |
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+ elif mode==module.MODE_ECB: |
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+ cipher = module.new(key, module.MODE_ECB) |
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else: |
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cipher = module.new(key, mode, iv) |
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