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[taler-anastasis] branch master updated: do bit twiddling correctly, it
From: |
gnunet |
Subject: |
[taler-anastasis] branch master updated: do bit twiddling correctly, it's little-endian |
Date: |
Mon, 18 Oct 2021 20:24:35 +0200 |
This is an automated email from the git hooks/post-receive script.
dold pushed a commit to branch master
in repository anastasis.
The following commit(s) were added to refs/heads/master by this push:
new 3a9e7d4 do bit twiddling correctly, it's little-endian
3a9e7d4 is described below
commit 3a9e7d47e8c0d8b5cc172d48c44afdeed6414429
Author: Florian Dold <florian@dold.me>
AuthorDate: Mon Oct 18 20:24:30 2021 +0200
do bit twiddling correctly, it's little-endian
---
doc/sphinx/cryptography.rst | 5 +++--
doc/system-documentation/design.tex | 5 +++--
src/util/anastasis_crypto.c | 6 ++++--
3 files changed, 10 insertions(+), 6 deletions(-)
diff --git a/doc/sphinx/cryptography.rst b/doc/sphinx/cryptography.rst
index 406732a..194b311 100644
--- a/doc/sphinx/cryptography.rst
+++ b/doc/sphinx/cryptography.rst
@@ -132,8 +132,9 @@ HKDF to ensure that the result differs from other cases
where we hash
.. code-block:: c
- digest[0] = (digest[0] & 0x7f) | 0x40;
- digest[31] &= 0xf8;
+ digest[0] &= 0xf8;
+ digest[31] &= 0x7f;
+ digest[31] |= 0x40;
**eddsa_priv**: The generated EdDSA private key.
diff --git a/doc/system-documentation/design.tex
b/doc/system-documentation/design.tex
index 650beb1..0883e7a 100644
--- a/doc/system-documentation/design.tex
+++ b/doc/system-documentation/design.tex
@@ -373,8 +373,9 @@ eddsa_keys_create (kdf_id, salt, keysize)
\end{description}
\begin{lstlisting}
-digest[0] = (digest[0] & 0x7f) | 0x40;
-digest[31] &= 0xf8;
+digest[0] &= 0xf8;
+digest[31] &= 0x7f;
+digest[31] |= 0x40;
\end{lstlisting}
\begin{description}
diff --git a/src/util/anastasis_crypto.c b/src/util/anastasis_crypto.c
index 1025e60..9231fc1 100644
--- a/src/util/anastasis_crypto.c
+++ b/src/util/anastasis_crypto.c
@@ -241,8 +241,10 @@ ANASTASIS_CRYPTO_account_private_key_derive (
return;
}
/* go from ver_secret to proper private key (eddsa_d_to_a() in spec) */
- priv_key->priv.d[0] = (priv_key->priv.d[0] & 0x7f) | 0x40;
- priv_key->priv.d[31] &= 0xf8;
+
+ priv_key->priv.d[0] &= 0xf8;
+ priv_key->priv.d[31] &= 0x7f;
+ priv_key->priv.d[31] |= 0x40;
}
--
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