Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Free Learning
Arrow right icon
Arrow up icon
GO TO TOP
Demystifying Cryptography with OpenSSL 3.0

You're reading from   Demystifying Cryptography with OpenSSL 3.0 Discover the best techniques to enhance your network security with OpenSSL 3.0

Arrow left icon
Product type Paperback
Published in Oct 2022
Publisher Packt
ISBN-13 9781800560345
Length 342 pages
Edition 1st Edition
Languages
Arrow right icon
Author (1):
Arrow left icon
Alexei Khlebnikov Alexei Khlebnikov
Author Profile Icon Alexei Khlebnikov
Alexei Khlebnikov
Arrow right icon
View More author details
Toc

Table of Contents (20) Chapters Close

Preface 1. Part 1: Introduction
2. Chapter 1: OpenSSL and Other SSL/TLS Libraries FREE CHAPTER 3. Part 2: Symmetric Cryptography
4. Chapter 2: Symmetric Encryption and Decryption 5. Chapter 3: Message Digests 6. Chapter 4: MAC and HMAC 7. Chapter 5: Derivation of an Encryption Key from a Password 8. Part 3: Asymmetric Cryptography and Certificates
9. Chapter 6: Asymmetric Encryption and Decryption 10. Chapter 7: Digital Signatures and Their Verification 11. Chapter 8: X.509 Certificates and PKI 12. Part 4: TLS Connections and Secure Communication
13. Chapter 9: Establishing TLS Connections and Sending Data over Them 14. Chapter 10: Using X.509 Certificates in TLS 15. Chapter 11: Special Usages of TLS 16. Part 5: Running a Mini-CA
17. Chapter 12: Running a Mini-CA 18. Index 19. Other Books You May Enjoy

How to encrypt with RSA programmatically

OpenSSL 3.0 provides the following APIs for RSA encryption:

  • A legacy API with the RSA_ prefix and the RSA_public_encrypt() function. This API has been deprecated since OpenSSL 3.0, so we are not going to use it.
  • The EVP_PKEY API, particularly the EVP_PKEY_encrypt() function. We are going to use this API.
  • The EVP_Seal API. This is a hybrid encryption API that generates a session key, encrypts the session key with RSA, and then encrypts the user data with the session key. This API contains the EVP_SealInit(), EVP_SealUpdate(), and EVP_SealFinal() functions, which work similarly to EVP_EncryptInit(), EVP_EncryptUpdate(), and EVP_EncryptFinal(). EVP_SealUpdate() is just #define for EVP_EncryptUpdate(). There are also the corresponding EVP_Open functions for decrypting the sealsEVP_OpenInit(), EVP_OpenUpdate(), and EVP_OpenFinal(). Unfortunately, the EVP_Seal API is rather inflexible. It supports only RSA encryption of...
lock icon The rest of the chapter is locked
Register for a free Packt account to unlock a world of extra content!
A free Packt account unlocks extra newsletters, articles, discounted offers, and much more. Start advancing your knowledge today.
Unlock this book and the full library FREE for 7 days
Get unlimited access to 7000+ expert-authored eBooks and videos courses covering every tech area you can think of
Renews at $19.99/month. Cancel anytime
Banner background image