---
name: "EVP_idea_cbc"
section: "3ssl"
platform: "linux"
package: "openssl"
version: "3.6.5-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/EVP_idea_cbc"
---

# EVP\_idea\_cbc(3ssl)

EVP IDEA cipher

## NAME

EVP\_idea\_cbc, EVP\_idea\_cfb, EVP\_idea\_cfb64, EVP\_idea\_ecb, EVP\_idea\_ofb - EVP IDEA cipher

## SYNOPSIS

```
 #include <openssl/evp.h>
 const EVP_CIPHER *EVP_idea_cbc(void);
 const EVP_CIPHER *EVP_idea_cfb(void);
 const EVP_CIPHER *EVP_idea_cfb64(void);
 const EVP_CIPHER *EVP_idea_ecb(void);
 const EVP_CIPHER *EVP_idea_ofb(void);
```

## DESCRIPTION

The IDEA encryption algorithm for EVP.

- **EVP\_idea\_cbc()**, **EVP\_idea\_cfb()**, **EVP\_idea\_cfb64()**, **EVP\_idea\_ecb()**, **EVP\_idea\_ofb()**

  The IDEA encryption algorithm in CBC, CFB, ECB and OFB modes respectively.

## NOTES

Developers should be aware of the negative performance implications of calling these functions multiple times and should consider using **EVP\_CIPHER\_fetch**(3) with **EVP\_CIPHER-IDEA**(7) instead. See "Performance" in [**crypto**(7)](/crypto/7.md) for further information.

## RETURN VALUES

These functions return an **EVP\_CIPHER** structure that contains the implementation of the symmetric cipher. See **EVP\_CIPHER\_meth\_new**(3) for details of the **EVP\_CIPHER** structure.

## SEE ALSO

**evp**(7), **EVP\_EncryptInit**(3), **EVP\_CIPHER\_meth\_new**(3)

## COPYRIGHT

Copyright 2017-2023 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\>.