But as public keys normally have a small public exponent, public keys may not always be accepted as private keys. So the components of a private key will always match those of a public key. Note that that a public key allows for a larger range of values than a private key (the public exponent may be small or large, the private exponent should always be near the key size).Private keys require security, such as protection against side channel attacks. the library will handle private keys operations differently from public key operations.First of all, OAEP padding mechanism is not compatible with the one for signing.įurthermore, there may be differences in handling the keys Unfortunately both concepts are not compatible.From the code however it seems you want to sign a message, but you are using an algorithm (RSA OAEP) that has been designed explicitly for encryption.Signature generation (providing authenticity & integrity) If you know the private key then a public key with a small public exponent can be easily guessed by an attacker.
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