Thanks! BIGNUM* n; BIGNUM* e; BIGNUM* d; EVP_PKEY_get_bn_param(cert.key(), OSSL_PKEY_PARAM_RSA_N, &n); EVP_PKEY_get_bn_param(cert.key(), OSSL_PKEY_PARAM_RSA_E, &e); EVP_PKEY_get_bn_param(cert.key(), OSSL_PKEY_PARAM_RSA_D, &d); Now, the reverse exercise for me: to create another RSA key, solely through EVP_PKEY interfaces (knowing these n, e, d parameters), I think I should go this route: mKey = EVP_PKEY_new(); EVP_PKEY_set_type(mKey, some int type ?); EVP_PKEY_set_bn_param(mKey, OSSL_PKEY_PARAM_RSA_N, n2); EVP_PKEY_set_bn_param(mKey, OSSL_PKEY_PARAM_RSA_E, e2); EVP_PKEY_set_bn_param(mKey, OSSL_PKEY_PARAM_RSA_D, d2); But how to get the proper int type to pass to EVP_PKEY_set_type()? Thanks all for support switching to OpenSSL 3.0. __ Best Regards, Meilleures salutations, Met vriendelijke groeten, Mit freundlichen Grüßen, Olivier Mascia > Le 30 juil. 2021 à 15:07, Dr Paul Dale <pauli@xxxxxxxxxxx> a écrit : > > Try: include/openssl/core_names.h > The names are "n", "e" and "d" in this case. > > > Pauli > > > On 30/7/21 10:57 pm, Olivier Mascia via openssl-users wrote: >> Dear all, >> >> Testing migration to OpenSSL 3.0. >> Got to update some code building a JWK (in relation to ACME LetsEncrypt protocols). >> >> Having an EVP_PKEY which happens to be a RSA key, I proceeded this way (1.1.1) to extract the bignums needed for inclusion into the JWK: >> >> // Access the numerical components of the certificate RSA keys. >> BIGNUM* n; >> BIGNUM* e; >> BIGNUM* d; >> RSA_get0_key(cert.RSAkey(), &n, &e, &d); >> >> ( my cert.RSAkey() returned RSA* from my embedded EVP_PKEY* through EVP_PKEY_get0_RSA() ) >> >> I understand I should now start straight from the EVP_PKEY and use : >> >> EVP_PKEY_get_bn_param(cert.key(), "name-n?", &n); >> EVP_PKEY_get_bn_param(cert.key(), "name-e?", &e); >> EVP_PKEY_get_bn_param(cert.key(), "name-d?", &d); >> >> ( cert.key() returns EVP_KEY* ) >> >> The question is: where can I find the proper names for these bignums out of a RSA key? >> >> __ >> Best Regards, Meilleures salutations, Met vriendelijke groeten, Mit freundlichen Grüßen, >> Olivier Mascia >> >> >
