Apr 02, 2019

In regards to the comment above: "After generating a key pair with OpenSSL, the public key can be stored in plain text format. I then encrypted the private key itself using regular mcrypt with the human-memorizable key of my choice and converted it to ACSII using base64_encode. What exactly is the purpose of these DH Parameters? These parameters define how OpenSSL performs the Diffie-Hellman (DH) key-exchange. As you stated correctly they include a field prime p and a generator g. The purpose of the availability to customize these parameter is to allow everyone to use his / her own parameters for this. OpenSSL is a robust, commercial-grade, and full-featured toolkit for the Transport Layer Security (TLS) and Secure Sockets Layer (SSL) protocols. It is also a general-purpose cryptography library. For more information about the team and community around the project, or to start making your own contributions, start with the community page. error: dereferencing pointer to incomplete type DH {aka struct dh_st} I've tried looking this up on the web, but there is no cleare guidance on how to get around this. I'm attempting to build our RHEL 7 based product on RHEL 8 and running into a lot of changes from openssl 1.0.2k-fips (RHEL 7) to 1.1.1 FIPS (RHEL 8).

The non-ephemeral DH modes are currently unimplemented in OpenSSL because there is no support for DH certificates. Some compiled versions of OpenSSL may not include all the ciphers listed here because some ciphers were excluded at compile time.

/news/vulnerabilities.html - OpenSSL

OpenSSL Cookbook: Chapter 1. OpenSSL - Feisty Duck

In the past, it was possible to call DH_generate_key when only (per documentation) the parameters p and g were set. Now, it seems that in some situations, q is required as well otherwise DH_generate_key fails with 0. SSL_CTX_set_tmp_dh is used to set the Diffie-Hellman parameters for a context. One of the easiest ways to get Diffie-Hellman parameters to use with this function is to generate random Diffie-Hellman parameters with the dhparam command-line program with the -C option, and embed the resulting code fragment in your program. Recent OpenSSL versions tend to select a DH modulus size that matches (from a security point of view) the strength of the server's key pair (used to sign the ServerKeyExchange message). In the example above, the server has a 2048-bit RSA key, so OpenSSL elected to use a 2048-bit DH modulus (in this case, the well-known modulus described in RFC $ openssl s_server -cert dh.crt -key dh.key -WWW -cert , -key オプションにより、作成した証明書と秘密鍵を指定します。 他にもオプションは色々あるのですが、特に指定しません。