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A subsequent patch will make the crypto/dh's dh_is_pubkey_valid() to calculate a safe-prime groups Q parameter from P: Q = (P - 1) / 2. For implementing this, mpi_rshift() will be needed. Export it so that it's accessible from crypto/dh. Signed-off-by: Nicolai Stange <nstange@suse.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>