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SEC h/w versions 2.1 and above support sha224 via explicit instruction. Performing sha224 ahashes on earlier versions is still possible because they support sha256 (sha224 is sha256 with different initial constants and a different truncation length). We do this by overriding hardware context self-initialization, and perform it manually in s/w instead. Thanks to Lee for his fixes for correct execution on actual sec2.0 h/w. Signed-off-by: Kim Phillips <kim.phillips@freescale.com> Signed-off by: Lee Nipper <lee.nipper@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>