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Brian Smith
nettle
Commits
12bbae8b
Commit
12bbae8b
authored
Sep 21, 2012
by
Niels Möller
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Stress that the salsa20 hash function is not for general use.
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ChangeLog
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12bbae8b
2012-09-21 Niels Möller <nisse@lysator.liu.se>
* nettle.texinfo (Cipher functions): Stress that the salsa20 hash
function is not suitable as a general hash function.
2012-09-20 Simon Josefsson <simon@josefsson.org>
* pbkdf2-hmac-sha1.c, pbkdf2-hmac-sha256.c: New files.
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nettle.texinfo
View file @
12bbae8b
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@@ -1275,12 +1275,15 @@ in this way to ridicule United States export restrictions which treated hash
functions as nice and harmless, but ciphers as dangerous munitions.
Salsa20 uses the same idea, but with a new specialized hash function to
mix key, block counter, and a couple of constants (input and output are
the same size, making it not directly applicable for use as a general
hash function). It's also designed for speed; on x86
_
64, it is currently
the fastest cipher offered by nettle. It uses a block size of 512 bits
(64 octets) and there are two specified key sizes, 128 and 256 bits (16
and 32 octets).
mix key, block counter, and a couple of constants. It's also designed
for speed; on x86
_
64, it is currently the fastest cipher offered by
nettle. It uses a block size of 512 bits (64 octets) and there are two
specified key sizes, 128 and 256 bits (16 and 32 octets).
@strong
{
Caution:
}
The hash function used in Salsa20 is @emph
{
not
}
directly applicable for use as a general hash function. It's @emph
{
not
}
collision resistant if arbitrary inputs are allowed, and furthermore,
the input and output is of fixed size.
When using Salsa20 to process a message, one specifies both a key and a
@dfn
{
nonce
}
, the latter playing a similar rôle to the initialization
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