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🔐 NAME

EVP_CIPHER-AES - The AES EVP_CIPHER implementations

🚀 Quick Reference

Use Case	Command	Description
Encrypt a file with AES‑256‑CBC	openssl enc -aes-256-cbc -in plain.txt -out encrypted.bin	Standard CBC encryption; prompts for a passphrase.
Decrypt that file	openssl enc -d -aes-256-cbc -in encrypted.bin -out plain.txt	Decrypts using the same passphrase.
Authenticated encryption with AES‑128‑GCM	openssl enc -aes-128-gcm -in plain.txt -out enc.bin -iv ... -tag ...	GCM provides both secrecy and integrity.
Use AES‑256‑CTR (stream mode)	openssl enc -aes-256-ctr -in input -out output	CTR mode turns AES into a stream cipher; no padding needed.

📖 DESCRIPTION

Support for AES symmetric encryption using the EVP_CIPHER API.

🧮 Algorithm Names

The following algorithms are available in the FIPS provider as well as the default provider:

• AES-128-CBC, AES-192-CBC, AES-256-CBC
• AES-128-CBC-CTS, AES-192-CBC-CTS, AES-256-CBC-CTS
• AES-128-CFB, AES-192-CFB, AES-256-CFB, AES-128-CFB1, AES-192-CFB1, AES-256-CFB1, AES-128-CFB8, AES-192-CFB8, AES-256-CFB8
• AES-128-CTR, AES-192-CTR, AES-256-CTR
• AES-128-ECB, AES-192-ECB, AES-256-ECB
• AES-192-OCB, AES-128-OCB, AES-256-OCB
• AES-128-SIV, AES-192-SIV, AES-256-SIV
• AES-128-XTS, AES-256-XTS
• AES-128-CCM, AES-192-CCM, AES-256-CCM
• AES-128-GCM, AES-192-GCM, AES-256-GCM
• AES-128-WRAP, AES-192-WRAP, AES-256-WRAP, AES-128-WRAP-PAD, AES-192-WRAP-PAD, AES-256-WRAP-PAD, AES-128-WRAP-INV, AES-192-WRAP-INV, AES-256-WRAP-INV, AES-128-WRAP-PAD-INV, AES-192-WRAP-PAD-INV, AES-256-WRAP-PAD-INV
• AES-128-CBC-HMAC-SHA1, AES-256-CBC-HMAC-SHA1, AES-128-CBC-HMAC-SHA256, AES-256-CBC-HMAC-SHA256

The following algorithms are available in the default provider, but not the FIPS provider:

• AES-128-OFB, AES-192-OFB, AES-256-OFB

⚙️ Parameters

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

🔗 SEE ALSO

provider-cipher(7), OSSL_PROVIDER-FIPS(7), OSSL_PROVIDER-default(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>.

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