method

compute_key

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What's this?

compute_key(p1) public

Returns a String containing a shared secret computed from the other party’s public value. See DH_compute_key() for further information.

Parameters

pub_bn is a OpenSSL::BN, not the DH instance returned by

DH#public_key as that contains the DH parameters only.

Show source

static VALUE
ossl_dh_compute_key(VALUE self, VALUE pub)
{
    DH *dh;
    EVP_PKEY *pkey;
    BIGNUM *pub_key;
    VALUE str;
    int len;

    GetPKeyDH(self, pkey);
    dh = pkey->pkey.dh;
    if (!dh->p)
        ossl_raise(eDHError, "incomplete DH");
    pub_key = GetBNPtr(pub);
    len = DH_size(dh);
    str = rb_str_new(0, len);
    if ((len = DH_compute_key((unsigned char *)RSTRING_PTR(str), pub_key, dh)) < 0) {
        ossl_raise(eDHError, NULL);
    }
    rb_str_set_len(str, len);

    return str;
}

compute_key

Related methods

Parameters