WinRTCrypto

Five sample applications written for Delphi give an introduction to symmetric encryption with AES, asymmetric encryption with RSA and hybrid encryption as a combination of both encryption alorithms and sign and verification. All code based on pure Delphi using the WinApi.WinRT and Winapi.Security.Cryptography library delivered since Delphi 10 Seattle. No additional 3rd party library are required. This code runs on Windows only and therefore uses the VCL.

Introduction to asymmetric encryption with RSA algorithms

This first sample app shows how easy it is to use asymmetric encryption for small messages.

Introduction to symmetric encryption with AES algorithms

This second sample app shows how easy it is to use symmetric encryption for longer real messages.

Combination of symmetric and asymmetric encryption within the hybrid encryption

This third sample app shows how to encrypt a message with the public key. The appropriate private key is used for subsequent decryption. With each encryption, a new session key is generated to symmetrically encrypt the entire message. Only this session key is encrypted and decrypted by asymmetric algorithms.

Hybrid encryption for several recipients of the same message

The fourth sample app expands the previous sample app by allowing decryption by more than one recipient.

For several recipients, the session key is encrypted asymmetrically with their public keys and appended to the message.

Hybrid encryption for several recipients with sender signature

The fiveth sample app expands the previous sample app by adding a sender signature to the message. When decrypting, this signature is used to check whether the message was created by the sender with the public key known to me.

The sample projects are developed and prepared for Delphi 11.3 Alexandria.

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