You have to decrypt with the same key that was used for encryption, otherwise you would just get random garbage. That's the whole point of encryption - if you don't know the key, you can't see the original data. I have made a mistake. This would be correct: Public key for encryption, private key for decryption. This is what i was asking, doesn't it?
I can make keys on one pc, transfer data and private key on another to decrypt it. I can move private key through secure channel and then send my data over none secure. Key generator make key pair private and public keys , no session keys.
This should work. However, it is ill-advised to encrypt data with RSA public key directly and in fact, I believe CryptAPI limits the amount of data that can be thus encrypted. RSA is vulnerable to analysis of large amounts of ciphertext. Besides, RSA encryption is slow, orders of magnitude slower than symmetric encryption.
So normally, you would generate a random session key, encrypt the data with some symmetric algorithm using that key, then encrypt that session key itself with RSA public key and send the encrypted key together with the data. The recipient would decrypt the session key with the private key, then decrypt the data with the session key.
If you can transport and store keys securely somehow, then you don't need public-key cryptography in the first place. Learn more about bidirectional Unicode characters Show hidden characters. Copy link. What should I put at "is decrypt mode" param? Sign up for free to join this conversation on GitHub.
Already have an account? Sign in to comment. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. CryptReleaseContext hProv, 0 ;.
CryptDestroyHash hHash ;. CryptDestroyKey hKey ;. CloseHandle hInpFile ;. NET Cryptographic Services. While the various OS libraries differ in performance, they should be compatible. The underlying ciphers and chaining are done by the system libraries, and all are supported by all platforms. AesCcm and System. AesGcm classes.
Users on macOS need to obtain an appropriate copy of OpenSSL libcrypto for these types to function, and it must be in a path that the system would load a library from by default. The libcrypto. The AesCcm class supports 56, 64, 72, 80, 88, 96, and bit 7, 8, 9, 10, 11, 12, and byte nonces. The AesCcm class supports creating or processing 32, 48, 64, 80, 96, , and bit 4, 8, 10, 12, 14, and byte tags. The AesGcm class supports only bit byte nonces.
The AesGcm class supports creating or processing 96, , , , and bit 12, 13, 14, 15, and byte tags. RSA Rivest—Shamir—Adleman key generation is performed by the OS libraries and is subject to their size limitations and performance characteristics. RSA key operations are performed by the OS libraries, and the types of key that can be loaded are subject to OS requirements.
The OS libraries are used for encryption and decryption padding. Not all platforms support the same padding options:. NET exposes types to allow programs to interoperate with the OS libraries that the. NET cryptography code uses. The types involved do not translate between platforms, and should only be directly used when necessary. In that case, any method that requires OS interop, such as opening a named key, throws a PlatformNotSupportedException.
If an appropriate library can't be found, exceptions will be thrown. Named curves are not available in earlier versions of Windows, except for three curves in Windows 7. The types involved don't translate between platforms and should only be directly used when necessary. All returned data is in terms of key derivation functions:.
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