Overview
Description
Topics
The RSA, AES, and SHA libraries for the RX family now support SBOM.
While network technology and digital devices have improved in terms of performance and convenience, there is also a growing concern about security issues such as data eavesdropping, tampering, privacy violations, and unauthorized copying of copyrighted works.
Renesas provides robust cryptographic libraries for the development of various systems that require security.
Features
- RZ/A1H Group Cryptographic Software Library
- RSA Library
- AES Library
- SHA Library
- Learn More
Release Information
| Target Device | Product Name | Supported Compilers | Latest Ver. / Released | Providing Method |
|---|---|---|---|---|
| RZ/A1H Group | RZ/A1H Group Cryptographic Software Library | Arm® Compiler v5 | Latest Ver.: V.1.01 Release 00 Released: Jan. 26, 2015 | Contact us |
| RL78 Family *1 | RSA Library for RL78 Family | CC-RL, IAR, LLVM | Latest Ver.: V.2.01 Release 00 Released: Jun. 30, 2022 | Download: RL78 Family RSA Library: Introduction Guide Rev.2.01 - Sample Code (ZIP) |
| AES Library for RL78 Family | Latest Ver.: V.2.01 Release 00 Released: Jun. 30, 2022 | Download: RL78 Family AES Library: Introduction Guide Rev.2.01 - Sample Code (ZIP) | ||
| SHA Library for RL78 Family | Latest Ver.: V.2.03 Release 00 Released: Aug. 1, 2025 | Download: RL78 Family SHA Hash Function Library: Introduction Guide Rev.2.03 - Sample Code (ZIP) | ||
| RL78/G24 FAA *1 | AES Library for RL78/G24 FAA | CC-RL, IAR | Latest Ver.: V.1.01 Release 00 Released: Aug. 1, 2025 | Download: RL78/G24 FAA AES Library Introduction Guide Rev.1.01 - Sample Code (ZIP) |
| SHA Library for RL78/G24 FAA *2 | Latest Ver.: V.2.03 Release 00 Released: Aug. 1, 2025 | Download: RL78 Family SHA Hash Function Library: Introduction Guide Rev.2.03 - Sample Code (ZIP) | ||
| RX Family | RSA Library for RX Family | CC-RX, GCC, IAR | Latest Ver.: V.1.06 Release 00 Released: Apr. 20, 2026 | Download: RX Family RSA Library Firmware Integration Technology Rev.1.06 - Sample Code (ZIP) |
| AES Library for RX Family | Latest Ver.: V.1.09 Release 00 Released: Apr. 20, 2026 | Download: RX Family AES Library Firmware Integration Technology Rev.1.09 - Sample Code (ZIP) | ||
| SHA Library for RX Family | Latest Ver.: V.1.07 Release 00 Released: Apr. 20, 2026 | Download: RX Family SHA Library Firmware Integration Technology Rev.1.07 - Sample Code (ZIP) |
*1.It can not be used for automotive applications.
*2.This library is included in the release package of the SHA Library for RL78 family.
Target Devices
Design & Development
Additional Details
Purpose
- Electronic Commerce
- Network Security
- Device Authentication
- Content Protection
- Tamper-Proofing
- Confidential Information Protection
etc.
Function
We offer cryptographic libraries for Renesas MCUs that perform software processing.
Library
| Type | Function | Target Devices | Supported Compilers |
|---|---|---|---|
| AES Library | AES encryption with a key length of 128/256 bits. Supported operation modes are ECB, CBC mode, and GCM (Galois/Counter mode). | RL78 Family *1 | CC-RL, IAR, LLVM |
| RL78/G24 FAA *1 *2 | CC-RL, IAR | ||
| RX Family | CC-RX, GCC, IAR | ||
| Hash Function Library | SHA-1, SHA-256, and SHA-384 (SHA-384 is only available for the RX family) Initial values are set and padding data is added within the library for ease of use. | RL78 Family *1 | CC-RL, IAR, LLVM |
| RL78/G24 FAA *1 *3 | CC-RL, IAR | ||
| RX Family | CC-RX, GCC, IAR | ||
| RSA Library | Key length: Maximum 2048 bits Encryption/decryption method RSAES-PKCS1-V1_5 Signature generation/verification method RSASSA-PKCS1-V1_5 Exponential remainder operation | RL78 Family *1 | CC-RL, IAR, LLVM |
| RX Family | CC-RX, GCC, IAR |
*1. It can not be used for automotive applications.
*2. It does not support GCM (Galois/Counter Mode).
*3. It only supports SHA-256.
Related Products
Driver
| Product Name | Function | Target Devices |
|---|---|---|
| AES Coprocessor Driver | High-speed execution of AES algorithm with HW | RX140(Part of a product), RX63N, RX64M, RX71M, and RX651/RX65N (ROM 1 Mbyte) groups |
| RNG Driver | Random Number Generate | RX140(Part of a product), RX63N, RX64M, RX71M, and RX651/RX65N (ROM 1 Mbyte) groups |
| SHA Coprocessor Driver | High-speed execution of SHA algorithm with HW | RX63N, RX64M, RX71M, and RX651/RX65N (ROM 1 Mbyte) groups |
| DES Coprocessor Driver | High-speed execution of DES algorithm with HW | RX63N, RX64M, RX71M, and RX651/RX65N (ROM 1 Mbyte) groups |
How to Obtain
Cryptographic libraries for Renesas MCUs that perform software processing can be downloaded from this page (except for some MCUs). Please download and use the sample code.
Cryptographic libraries or hardware accelerator drivers that are not available for download are provided to customers who are using or planning to use Renesas MCUs. Please contact your Renesas Electronics sales representative.
Target Devices
- RL78 Family * It can not be used for automotive applications
- RX Family
Please refer to Function for details.
Support
Support Communities
- Why does the cryptographic library include the caveat "not for automotive applications?"
Hello all, The title is essentially the question. The RL78 cryptographic library has a caveat that it cannot be used for automotive applications. I would like to understand if this is a technical restriction due to the characteristics of the MCU, or if this is a regulatory restriction? Thank you ...
Nov 6, 2019 - SHA-256 library (RL78/G11)
Hi. I work with the RL78/G11 and I need to calculate HASH in my application. I found that Renesas has personal implementation of the SHA-256 (https://www.renesas.com/eu/en/software-tool/crypto-library). But, I read that this library ...
Nov 16, 2023 - Crypto framework and multiple threads
When I add crypto framework using Synergy configurator, it creates an instance per thread. For example g_sf_crypto_hash0 or g_sf_crypto_cipher0. However, our code which we're porting to Synergy platform uses single global crypto library for all threads. I'm looking for a way how ...
Jun 26, 2019
Knowledge Base
- RH850/F1K Crypto library RSA Algorithm
The devices feature the ICU-S which is only doing symmetric AES operations. For RSA there is no hardware support. Renesas do not offer a SW library. But there are some 3rd parties (Vektor, Elektrobit) which offer such a library.
Feb 7, 2024 - Why is the SHA hash function library (crypto library) for RL78-family products unavailable for in-vehicle use?
Last Updated: 02/20/2024 Question: Why is the SHA hash function library for RL78-family products unavailable for in-vehicle use although it is available for other general uses? Answer: Since we have not performed self-established in-vehicle grading and evaluation for the library, we cannot ...
Feb 20, 2024 - RA Family: Parsing OpenSSL ECDSA Signatures to Raw Format for ECDSA Verification with the SCE API
Last Updated: 11/06/2025 OverviewCryptographic libraries such as OpenSSL typically handle ECDSA signatures as byte sequences encoded in ASN.1 DER (Distinguished Encoding Rules) format. This standardized format ensures consistency when exchanging signature data across different systems and platforms. Although the length of a signature varies ...
Nov 6, 2025
Support Communities
