Decapsulate a shared secret from a KEM ciphertext using a context from EVP_PKEY_decapsulate_init().
Declared in <openssl/evp.h>
int
EVP_PKEY_decapsulate(
EVP_PKEY_CTX* ctx,
unsigned char* unwrapped,
size_t* unwrappedlen,
unsigned char const* wrapped,
size_t wrappedlen);1 on success, or a non-positive value on failure.
| Name | Description |
|---|---|
| ctx | Decapsulation context holding the private key. |
| unwrapped | Buffer for the recovered shared secret, or NULL to query size via unwrappedlen. |
| unwrappedlen | On entry, capacity of unwrapped when non-NULL; on return, bytes written or required. |
| wrapped | Encapsulation ciphertext bytes. |
| wrappedlen | Length of wrapped in bytes. |