take a look at this current pkey impl: https://github.com/openssl/openssl/blob/OpenSSL_1_1_0-stable/crypto/evp/evp_pkey.c#L21 https://github.com/openssl/openssl

take a look at this current pkey impl: https://github.com/openssl/openssl/blob/OpenSSL_1_1_0-stable/crypto/evp/evp_pkey.c#L21 https://github.com/openssl/openssl/blob/OpenSSL_1_1_0-stable... and compare that to 0.9.8: https://github.com/openssl/openssl/blob/OpenSSL-fips-0_9_8-stable/crypto/evp/evp_pkey.c#L81 https://github.com/openssl/openssl/blob/OpenSSL-fips-0_9_8-s... You'll notice how much cleaner the code is. Error conditions are more consistently handled. Many fewer macros interleaving the code... etc.