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Demystifying Cryptography with OpenSSL 3.0

You're reading from  Demystifying Cryptography with OpenSSL 3.0

Product type Book
Published in Oct 2022
Publisher Packt
ISBN-13 9781800560345
Pages 342 pages
Edition 1st Edition
Languages
Concepts
Author (1):
Alexei Khlebnikov Alexei Khlebnikov
Profile icon Alexei Khlebnikov
LinkedIn
Alexei Khlebnikov has more than 20 years of professional experience in IT, where he worked in different roles - software developer, system administrator, DevOps engineer, technical leader, architect and project manager. During those years Alexei worked with many technologies - Security, Artificial Intelligence, Web Development, Embedded, Mobile, and Robotics. Among other companies, Alexei worked in Opera Software on the famous Opera Internet browser. Alexei has always been interested in security. He was one of the maintainers of security-related Opera browser modules, responsible for cryptography, SSL/TLS and integration with OpenSSL. He was also a member of the Security Architects group, responsible for the security of the Opera browser. Now Alexei lives in Oslo, Norway, and works as a senior consultant for Bespoke AS. He is also the leader of the Architects group at his current employer.
See other products by Alexei Khlebnikov

Table of Contents (20) Chapters

Preface 1. Part 1: Introduction
2. Chapter 1: OpenSSL and Other SSL/TLS Libraries 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

Understanding OpenSSL BIOs

To establish TLS connections and send data over them, we will use OpenSSL Basic Input/Output (BIO) objects. BIOs provide the same Application Programming Interface (API) for working with different types of Input/Output (I/O) channels, such as files, sockets, and TLS streams.

BIOs are divided into two types: source or sink BIOs and filter BIOs. A source or sink BIO represents an I/O endpoint, such as a file or a socket. A filter BIO transforms data that is being passed through the BIO. For example, a cipher BIO encrypts data when being written to and decrypts data when being read from. BIOs can be connected and form a chain of BIOs. For example, an SSL BIO can be connected to a socket BIO, providing TLS communication on a socket.

OpenSSL supports the following source or sink BIOs:

  • Accept BIO (BIO_s_accept): TCP/IP socket or Unix socket accept routines.
  • BIO BIO (BIO_s_bio): A BIO pair where whatever is written to one half of the pair can be...
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Authors (1)

Profile icon Alexei Khlebnikov
LinkedIn
Alexei Khlebnikov has more than 20 years of professional experience in IT, where he worked in different roles - software developer, system administrator, DevOps engineer, technical leader, architect and project manager. During those years Alexei worked with many technologies - Security, Artificial Intelligence, Web Development, Embedded, Mobile, and Robotics. Among other companies, Alexei worked in Opera Software on the famous Opera Internet browser. Alexei has always been interested in security. He was one of the maintainers of security-related Opera browser modules, responsible for cryptography, SSL/TLS and integration with OpenSSL. He was also a member of the Security Architects group, responsible for the security of the Opera browser. Now Alexei lives in Oslo, Norway, and works as a senior consultant for Bespoke AS. He is also the leader of the Architects group at his current employer.
Read more
See other products by Alexei Khlebnikov

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