Derive a shared secret using a context initialized with EVP_PKEY_derive_init().
Declared in <openssl/evp.h>
int
EVP_PKEY_derive(
EVP_PKEY_CTX* ctx,
unsigned char* key,
size_t* keylen);
1 on success, or 0 / a negative value on failure.
| Name | Description |
|---|---|
| ctx | Key derivation context that already has a peer key configured when required. |
| key | Output buffer for the shared secret, or NULL to query the required length. |
| keylen | On input, size of key; on output, number of bytes written or required. |