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The shared secret returned by openssl_dh_compute_key () is often used as an encryption key to secretly communicate with a remote party. This is known as the Diffie-Hellman key exchange.
The shared secret returned by openssl_dh_compute_key () is often used as an encryption key to secretly communicate with a remote party. This is known as the Diffie-Hellman key exchange.
Apr 7, 2026 · DH_compute_key () computes the shared secret from the private DH value in dh and the other party's public value in pub_key and stores it in key. key must point to DH_size (dh) bytes of memory. The padding style is RFC 5246 (8.1.2) that strips leading zero bytes. It is not constant time due to the leading zero bytes being stripped.
DH_generate_key () performs the first step of a Diffie-Hellman key exchange by generating private and public DH values. By calling DH_compute_key () or DH_compute_key_padded (), these are combined with the other party's public value to compute the shared key.
PHP Manual openssl_dh_compute_key — Computes shared secret for public value of remote DH key and local DH key
DH_generate_key () performs the first step of a Diffie-Hellman key exchange by generating private and public DH values. By calling DH_compute_key () or DH_compute_key_padded (), these are combined with the other party's public value to compute the shared key.
19 DH_generate_key () performs the first step of a Diffie-Hellman key 20 exchange by generating private and public DH values. By calling 21 DH_compute_key () or DH_compute_key_padded (), these are combined with 22 the other party's public value to compute the shared key. 23 24 DH_generate_key () expects dh to contain the shared parameters dh->p ...
