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[Source] .NET/C# RSA PEM format encryption and decryption

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Posted on 6/1/2023 9:33:57 PM | | | |
Requirements: Friends and third-party systems are jointly debugged, and the interface transmission is encrypted and decrypted HTTP content using the RSA algorithm, due toThird-party projects are developed in Java, with the other party providing the public and private keys, and then in PEM formatHow does .NET/C# encrypt and decrypt content based on PEM certificates?

PEM format

The PEM format is commonly used by digital certificate authorities (CAs) with extensions .pem, .crt, .cer, and .key. The content is a Base64 encoded ASCII code file with header and tail tags like "-----BEGIN CERTIFICATE-----" and "-----END CERTIFICATE-----". Server certificates, intermediate certificates, and private keys can all be stored in PEM format (certificates are actually public keys). Apache and similar servers use PEM format certificates.

Review:

Implementation of RSA encryption and decryption in java
https://www.itsvse.com/thread-6987-1-1.html

.NET Core uses the RSA encryption algorithm for error reporting solutions
https://www.itsvse.com/thread-4884-1-1.html

Alipay RSA private key and public key one-click generation tool
https://www.itsvse.com/thread-2909-1-1.html

RSA generates public and private keys, as well as encryption and decryption
https://www.itsvse.com/thread-2470-1-1.html

c# RSA encryption decryption Segmented encryption and segmented decryption
https://www.itsvse.com/thread-2779-1-1.html
First, use "Alipay RAS Key Generator SHAwithRSA1024_V1.0" to generate public and private keys in PEM format, as follows:



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Private key file：rsa_private_key_pkcs8.pem
Public key file：rsa_public_key.pem

Create a new .NET 6 console app that references the BouncyCastle.Cryptography third-party package via nuget as follows:

The code is as follows:

Test RSA encryption and decryption, as shown in the figure below:



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 Landlord| Posted on 6/9/2023 8:27:52 PM |
C#.net core encryption and decryption RSA private key encryption, signature, and signature verification tools Java to .net, php encryption and decryption instances, not tested.



RSA encryption is an asymmetric encryption. Decryption can be completed without passing the key directly. This ensures the security of information and avoids the risk of cracking caused by passing the key directly. It is the process of encryption and decryption by a pair of keys, called public and private keys, respectively. There is a mathematical correlation between the two, and the principle of the encryption algorithm is to ensure security by factoring a large integer. Usually the private key is kept by the individual, and the public key is public (it may be held by multiple people at the same time).

RSA can be used for cryptographic decryption and signature verification.


Another file

Usage examples:

php private key encryption public key decryption tool reference code:

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 Landlord| Posted on 9/6/2024 8:44:28 AM |
Encrypt the backend using the RSA algorithm (. NET) decrypted
https://www.itsvse.com/thread-10826-1-1.html
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