Process Of Key Generation In Aes Rating: 5,0/5 9889 reviews

Introduction

The main thing that changes in AES is how you generate the key schedule from the key — an issue I address at the end of Section 8.8.1. The notion of key schedule in AES is explained in Sections 8.2 and 8.8. Encryption consists of 10 rounds of processing for 128-bit keys, 12 rounds for 192-bit keys, and 14 rounds for 256-bit keys. AES is a symmetric block cipher where a single key is used for both encryption and decryption process. The input and output for the AES algorithm each consist of sequences of 128 bits. The key used in this algorithm consists of 128, 192, or 256 bits.

Recently we had a requirement in our organization to implement encryption for all data transmission happening from SAP to external systems to have an additional layer of security. The requirement was to AES256 encrypt and Base64 Encode the information shared between the systems.The encryption/decryption was done with a common key which gets generated in SAP and shared through automated email from the system. Nero 7 premium serial key generator.

SAP Class/Function Modules used for the process:

  • CL_SEC_SXML_WRITER is used to implement the logic for generation of AES key and encryption/decryption of information.
  • SCMS_BASE64_<EN/DE>CODE_STR FM is being used for Base64 Encoding/Decoding the information.

High Level Process Flow

Following are the steps and sample code we have used for encryption/decryption.

Generate Encryption Key

We use following logic to generate Key for encryption which is stored in a table and then shared with external systems.

Content generation using key words python. A generator function is defined like a normal function, but whenever it needs to generate a value, it does so with the yield keyword rather than return.

Decryption

Key Generation Process In Aes-256

External System sends AES encrypted and Base64 encoded data and in SAP we used following logic to decrypt the text.

Encryption:

SAP processes the information and sends encrypted response back using following logic:

Sample Output:

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Conclusion

The blog post provides information on how to encrypt and decrypt information in SAP and how you can plan the integration with external systems. The sample code here works for AES256/CBC/PKCS5 Padding algorithm, but CL_SEC_SXML_WRITER class has other AES encryption algorithms as well.

Key Generation Aes

Please note along with the encryption key, we also need to share the IV key which is 16bit hexadecimal string (‘0000000000000000’).

Process Of Key Generation In Aes 1

Hopefully this blog post will help in implementing similar requirements where we need to send encrypted information between multiple systems.