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This code is just trying to condition 48 bytes of random data. This can be done easily using HKDF-SHA512-Extract, saving 300 lines of code. This commit also fixes forward security (in this particular case) by clearing the entropy from memory after it's used. Signed-off-by: Eric Biggers <ebiggers@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>