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📝 NAME

EVP_CIPHER-SEED - The SEED EVP_CIPHER implementations

🚀 Quick Reference

Use Case	Command	Description
Encrypt/Decrypt with SEED-CBC	EVP_CIPHER_fetch(NULL, "SEED-CBC", "provider=legacy")	SEED cipher in CBC mode, 128-bit key
Encrypt/Decrypt with SEED-ECB	EVP_CIPHER_fetch(NULL, "SEED-ECB", "provider=legacy")	SEED cipher in ECB mode, 128-bit key
Encrypt/Decrypt with SEED-OFB	EVP_CIPHER_fetch(NULL, "SEED-OFB", "provider=legacy")	SEED cipher in OFB mode, 128-bit key, 128-bit feedback
Encrypt/Decrypt with SEED-CFB	EVP_CIPHER_fetch(NULL, "SEED-CFB", "provider=legacy")	SEED cipher in CFB mode, 128-bit key, 128-bit feedback

📖 DESCRIPTION

Support for SEED symmetric encryption using the EVP_CIPHER API.

🏷️ Algorithm Names

The following algorithms are available in the legacy provider:

• SEED-CBC or SEED
• SEED-ECB
• SEED-OFB or SEED-OFB128
• SEED-CFB or SEED-CFB128

⚙️ 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-SEED(7SSL)

📝 NAME 🚀 Quick Reference 📖 DESCRIPTION 📚 SEE ALSO © COPYRIGHT