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3 Commits

Author SHA1 Message Date
Theodore Ts'o e192be9d9a random: replace non-blocking pool with a Chacha20-based CRNG 
The CRNG is faster, and we don't pretend to track entropy usage in the
CRNG any more.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
 2016-07-03 00:57:23 -04:00
Martin Willi 31d7247da5 crypto: chacha20 - Export common ChaCha20 helpers 
As architecture specific drivers need a software fallback, export a
ChaCha20 en-/decryption function together with some helpers in a header
file.

Signed-off-by: Martin Willi <martin@strongswan.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
 2015-07-17 21:20:21 +08:00
Martin Willi c08d0e6473 crypto: chacha20 - Add a generic ChaCha20 stream cipher implementation 
ChaCha20 is a high speed 256-bit key size stream cipher algorithm designed by
Daniel J. Bernstein. It is further specified in RFC7539 for use in IETF
protocols as a building block for the ChaCha20-Poly1305 AEAD.

This is a portable C implementation without any architecture specific
optimizations. It uses a 16-byte IV, which includes the 12-byte ChaCha20 nonce
prepended by the initial block counter. Some algorithms require an explicit
counter value, for example the mentioned AEAD construction.

Signed-off-by: Martin Willi <martin@strongswan.org>
Acked-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
 2015-06-04 15:04:49 +08:00