#include <openssl/evp.h> int EVP_PKEY_decapsulate_init(EVP_PKEY_CTX *ctx, const OSSL_PARAM params[]); int EVP_PKEY_decapsulate(EVP_PKEY_CTX *ctx, unsigned char *unwrapped, size_t *unwrappedlen, const unsigned char *wrapped, size_t wrappedlen);
The EVP_PKEY_decapsulate() function performs a private key decapsulation operation using ctx. The data to be decapsulated is specified using the wrapped and wrappedlen parameters. If unwrapped is NULL then the maximum size of the output secret buffer is written to *unwrappedlen. If unwrapped is not NULL and the call is successful then the decapsulated secret data is written to unwrapped and the amount of data written to *unwrappedlen.
#include <openssl/evp.h> /* * NB: assumes rsa_priv_key is an RSA private key, * and that in, inlen are already set up to contain encapsulated data. */ EVP_PKEY_CTX *ctx = NULL; size_t secretlen = 0; unsigned char *secret = NULL;; ctx = EVP_PKEY_CTX_new_from_pkey(libctx, rsa_priv_key, NULL); if (ctx = NULL) /* Error */ if (EVP_PKEY_decapsulate_init(ctx, NULL) <= 0) /* Error */ /* Set the mode - only 'RSASVE' is currently supported */ if (EVP_PKEY_CTX_set_kem_op(ctx, "RSASVE") <= 0) /* Error */ /* Determine buffer length */ if (EVP_PKEY_decapsulate(ctx, NULL, &secretlen, in, inlen) <= 0) /* Error */ secret = OPENSSL_malloc(secretlen); if (secret == NULL) /* malloc failure */ /* Decapsulated secret data is secretlen bytes long */ if (EVP_PKEY_decapsulaterctx, secret, &secretlen, in, inlen) <= 0) /* Error */
Licensed under the Apache License 2.0 (the ``License''). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>.