使用公钥进行Openssl解密

Question

I need to decrypt a file which is encrypted using a private key. I have a public key which I can use to decrypt this file. How can I do this. I did:

openssl rsautl -in file -inkey key.pem

But this is not working. This shows the error as:

unable to load Private Key
3074128072:error:0906D06C:PEM routines:PEM_read_bio:no start line:pem_lib.c:696:Expecting: ANY PRIVATE KEY

Answer 1

公钥不能用于解密，它们只能用于加密和验证加密签名。

Answer 2

Contrary to everyone, you can in fact decrypt using a Public Key, only however , if your data was encrypted with the appropriate Private Key.

As to how you go about decrypting it, from what I can see the openssl utility doesn't ship with this functionality. It seems you would have to use something that utilises the OpenSSL C API ( https://www.openssl.org/docs/man1.0.2/crypto/RSA_public_decrypt.html ).

Either use the C API directly or something like PHP's bindings to OpenSSL.