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EVP_CIPHER-CAST(7SSL) — OpenSSL

📌 NAME

EVP_CIPHER-CAST — The CAST EVP_CIPHER implementations

🚀 Quick Reference

Use Case	Command	Description
🔐 Encrypt with CAST-128-CBC	EVP_CIPHER_fetch(NULL, "CAST-128-CBC", NULL)	Obtain a CAST-128 cipher in CBC mode (64‑bit block, 128‑bit key)
🔐 Encrypt with CAST-192-CBC	EVP_CIPHER_fetch(NULL, "CAST-192-CBC", NULL)	CAST cipher with 192‑bit key, CBC mode
🔐 Encrypt with CAST-256-CBC	EVP_CIPHER_fetch(NULL, "CAST-256-CBC", NULL)	CAST cipher with 256‑bit key, CBC mode (128‑bit block)
🔁 Use CFB mode	EVP_CIPHER_fetch(NULL, "CAST-128-CFB", NULL)	CAST-128 in CFB (cipher feedback) mode
🔁 Use ECB mode	EVP_CIPHER_fetch(NULL, "CAST-128-ECB", NULL)	CAST-128 in ECB (electronic codebook) mode
🔁 Use OFB mode	EVP_CIPHER_fetch(NULL, "CAST-128-OFB", NULL)	CAST-128 in OFB (output feedback) mode
🔧 Access parameters	EVP_CIPHER_CTX_get_params()	Retrieve cipher parameters (key size, IV length, etc.)
🔧 Set parameters	EVP_CIPHER_CTX_set_params()	Set cipher parameters (e.g., custom key length)
📦 Load legacy provider	OSSL_PROVIDER_load(NULL, "legacy")	CAST algorithms are only available in the legacy provider

📖 Description

Support for CAST symmetric encryption using the EVP_CIPHER API.

🏷️ Algorithm Names

The following algorithms are available in the legacy provider:

• CAST-128-CBC, CAST-192-CBC and CAST-256-CBC
• CAST-128-CFB, CAST-192-CFB, CAST-256-CFB
• CAST-128-ECB, CAST-192-ECB and CAST-256-ECB
• CAST-192-OFB, CAST-128-OFB and CAST-256-OFB

⚙️ Parameters

This implementation supports the parameters described in PARAMETERS in EVP_EncryptInit(3).

📚 See Also

• provider-cipher(7)
• OSSL_PROVIDER-legacy(7)

📄 Copyright

Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at https://www.openssl.org/source/license.html.

3.0.2 — 2026-06-02 — EVP_CIPHER-CAST(7SSL)

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EVP_CIPHER-CAST(7SSL) — OpenSSL 📌 NAME 🚀 Quick Reference 📖 Description 📚 See Also 📄 Copyright