Why not just copy the key?
EVP_PKEY *cp_key (EVP_PKEY *pkey) {
/* error handling omittet */
EVP_PKEY *pnew;
int key_type;
pnew = EVP_PKEY_new();
switch(pkey->type) {
case EVP_PKEY_RSA:
DSA *dsa = EVP_PKEY_get1_DSA(pkey);
EVP_PKEY_set1_DSA(pnew, dsa);
break;
case EVP_PKEY_DSA:
RSA *rsa = EVP_PKEY_get1_RSA(pkey);
EVP_PKEY_set1_RSA(pnew, rsa);
break;
case EVP_PKEY_DH:
DH *dh = EVP_PKEY_get1_DH(pkey);
EVP_PKEY_set1_DH(pnew, dh);
break;
case EVP_PKEY_EC:
EC_KEY *ec = EVP_PKEY_get1_EC(pkey);
EVP_PKEY_set1_EC(pnew, ec);
break;
default:
fprintf(stderr, "unknown key type %.\n", pkey->type);
}
return pnew;
}
Thomas
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