As I wrote before, there is no such function. There is only the EVP_PKEY_get_size() which gives you the maximum length the encrypted data can have for a given key. If you do not know the length of the ciphertext for the EVP_PKEY_decrypt() call, you can use the EVP_PKEY_get_size() value, compare it with the data length of your data and if it is smaller, use it as the ciphertext length in the EVP_PKEY_decrypt() call. That should work fine - at least with the algorithms currently supported by OpenSSL. On Sat, 2022-10-01 at 22:16 +0000, ANUJ SHARMA wrote: > Hi, > Just wanted to know that is there any Openssl/EVP_PKEY function where > I pass the encrypted data and encryption method and get the size of > encrypted data. > Something like: > EncryptedDataLen=OpensslFunc(encrypted_data,encryption_method) > > Thanks for your helping in advance. -- Tomáš Mráz, OpenSSL
