EVP_SM4_CBC(3ossl)

📦 version 3.5.0, in opensuse-leap 16.0

💖 NAME 💖

okay so bestie, welcome to EVP_SM4_CBC(3ossl) — the OpenSSL manual page for the EVP SM4 cipher. The whole function squad is:

  • EVP_sm4_cbc
  • EVP_sm4_ecb
  • EVP_sm4_cfb
  • EVP_sm4_cfb128
  • EVP_sm4_ofb
  • EVP_sm4_ctr

✨ SYNOPSIS ✨

        #include <openssl/evp.h>

        const EVP_CIPHER *EVP_sm4_cbc(void);
        const EVP_CIPHER *EVP_sm4_ecb(void);
        const EVP_CIPHER *EVP_sm4_cfb(void);
        const EVP_CIPHER *EVP_sm4_cfb128(void);
        const EVP_CIPHER *EVP_sm4_ofb(void);
        const EVP_CIPHER *EVP_sm4_ctr(void);

🌸 DESCRIPTION 🌸

It's the SM4 blockcipher (GB/T 32907-2016) for EVP — iconic little symmetric-cipher moment. Every mode below uses a key length of 128 bits and acts on blocks of 128 bits. Yes, 128 and 128, she said what she said. 💅

  • EVP_sm4_cbc(), EVP_sm4_ecb(), EVP_sm4_cfb(), EVP_sm4_cfb128(), EVP_sm4_ofb(), EVP_sm4_ctr() — the SM4 blockcipher with a 128-bit key in CBC, ECB, CFB, OFB, and CTR modes respectively. That's the whole group, bestie: six entry points, same blockcipher energy. 🦋

🔥 NOTES 🔥

no cap, developers should be aware of the negative performance implications of calling these functions multiple times. Please consider using EVP_CIPHER_fetch(3) with EVP_CIPHER-SM4(7) instead. See "Performance" in crypto(7) for further information. That's the vibe check. 💅

🫶 RETURN VALUES 🫶

These functions return a EVP_CIPHER structure that contains the implementation of the symmetric cipher. For the details of the EVP_CIPHER structure, see EVP_CIPHER_meth_new(3). It's giving "here's your cipher object, go be main character." ✨

🌈 SEE ALSO 🌈

Copyright 2017-2023 The OpenSSL Project Authors. All Rights Reserved.

Copyright 2017 Ribose Inc. 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>.

and that's the page, bestie — source/version 3.5.0, date 2026-09-25, manual EVP_SM4_CBC(3ossl). bye and slay 💅✨

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