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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

How to sign programmatically

OpenSSL 3.0 provides the following APIs for digital signatures:

  • Legacy low-level APIs that consist of functions with algorithm-specific prefixes, such as RSA_, DSA_, and ECDSA_. These APIs have been deprecated since OpenSSL 3.0.
  • The EVP_PKEY API: This API is not deprecated but is still low level. It is more convenient to use a high-level API.
  • The EVP_Sign API: This API is high level but has some disadvantages. This API uses the key argument only after the whole input data has been read and hashed. Therefore, if there is a problem with the key, it will be discovered later rather than sooner. Another disadvantage is that this API is inflexible and does not allow you to set signing parameters to PKEY_CTX if the signature algorithm supports them. The OpenSSL documentation does not recommend this API.
  • The EVP_DigestSign API: This is a high-level API where drawbacks of the EVP_Sign API have been fixed. The OpenSSL documentation recommends...
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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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