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pgcrypto: support changing S2K iteration count

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pgcrypto already supports key-stretching during symmetric encryption,
including the salted-and-iterated method; but the number of iterations
was not configurable.  This commit implements a new s2k-count parameter
to pgp_sym_encrypt() which permits selecting a larger number of
iterations.

Author: Jeff Janes
This commit is contained in:
Alvaro Herrera
2016-03-09 14:31:07 -03:00
parent b6fb6471f6
commit 188f359d39
9 changed files with 98 additions and 16 deletions
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13
doc/src/sgml/pgcrypto.sgml
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@ -858,6 +858,19 @@ Applies to: pgp_sym_encrypt
</literallayout>
</sect4>
<sect4>
<title>s2k-count</title>
<para>
The number of iterations of the S2K algorithm to use. It must
be a value between 1024 and 65011712, inclusive.
</para>
<literallayout>
Default: A random value bewteen 65536 and 253952
Applies to: pgp_sym_encrypt, only with s2k-mode=3
</literallayout>
</sect4>
<sect4>
<title>s2k-digest-algo</title>