EVP_get_cipherbyname always returns null
问题 I have a problem when calling EVP_get_cipherbyname on macOS: const char *cipher_str = "aes-256-cbc"; const evp_cipher_st *cipher1 = EVP_aes_256_cbc(); const evp_cipher_st *cipher2 = EVP_get_cipherbyname(cipher_str); In the code above, cipher1 will always be set to a valid evp_cipher_st * object, and cipher2 will always be null. I haven't found a single instance of cipher_str that produces a non-null cipher2 . Am I doing something wrong? Are there some other calls I should be making to get