Hi ,
While migrating from 1.0.2 to 3.0, we found that DH_compute_key () has be
deprecated.
In the current we are using the compute API as below
dh->priv_key = BN_bin2bn(privateKey, octet_len, NULL);
bn_publicKey = BN_bin2bn(publicKey, octet_len, NULL);
rv = DH_compute_key(sharedSecret, bn_publicKey, dh);
to exactly replace this we are generating "pubparam_key/priparam_key" using
bn_publicKey/dh->priv_key as below
OSSL_PARAM_BLD *pubparamsbld = NULL, priparamsbld = NULL;
OSSL_PARAM *pubparams = NULL, priparams = NULL;
EVP_PKEY *pubparam_key = NULL, *priparam_key = NULL;
EVP_PKEY_CTX *pubctx = NULL, *prictx = NULL;
pubparamsbld = OSSL_PARAM_BLD_new()
priparamsbld = OSSL_PARAM_BLD_new()
OSSL_PARAM_BLD_push_BN(pubparamsbld, OSSL_PKEY_PARAM_PUB_KEY, bn_publicKey)
OSSL_PARAM_BLD_push_BN(priparamsbld, OSSL_PKEY_PARAM_PRIV_KEY,bn_privateKey)
//build context
pubctx = EVP_PKEY_CTX_new_from_name(NULL, "DH", NULL);
prictx = EVP_PKEY_CTX_new_from_name(NULL, "DH", NULL);
EVP_PKEY_key_fromdata_init(pubctx)
EVP_PKEY_key_fromdata_init(prictx)
pubparams = OSSL_PARAM_BLD_to_param(pubparamsbld);
EVP_PKEY_fromdata(pubctx, &pubparam_key, pubparams))
priparams = OSSL_PARAM_BLD_to_param(priparamsbld);
EVP_PKEY_fromdata(prictx, &priparam_key, priparams))
>From there, we are planning to use EVP_PKEY_derive_init,
>EVP_PKEY_derive_set_peer, and EVP_PKEY_derive to get shared secret
Please suggest if any step is invalid or not necessary
Regards,
Sunil
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