From bc91494e064ebdcff68f987947f97e404fbca0b5 Mon Sep 17 00:00:00 2001 From: "Dr. Stephen Henson" Date: Tue, 8 Mar 2011 19:07:26 +0000 Subject: New SP 800-56A compliant version of DH_compute_key(). --- crypto/dh/dh_key.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'crypto/dh/dh_key.c') diff --git a/crypto/dh/dh_key.c b/crypto/dh/dh_key.c index bba83be312..6c7a457267 100644 --- a/crypto/dh/dh_key.c +++ b/crypto/dh/dh_key.c @@ -86,6 +86,21 @@ int DH_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh) return dh->meth->compute_key(key, pub_key, dh); } +int DH_compute_key_padded(unsigned char *key, const BIGNUM *pub_key, DH *dh) + { + int rv, pad; + rv = dh->meth->compute_key(key, pub_key, dh); + if (rv <= 0) + return rv; + pad = BN_num_bytes(dh->p) - rv; + if (pad > 0) + { + memmove(key + pad, key, rv); + memset(key, 0, pad); + } + return rv + pad; + } + static DH_METHOD dh_ossl = { "OpenSSL DH Method", generate_key, -- cgit v1.2.3