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• Openssl Generate Key File

Then Generate a Key PAIR of AES+IV using Openssl. #openssl enc -nosalt -aes-256-cbc -k hello-aes -P Remember: in above command hello-aes is important and is like password. If you type anything in place of hello the key and iv value will changed. Creating a File named a.txt using echo. Generate an AES key plus Initialization vector (iv) with openssl and; how to encode/decode a file with the generated key/iv pair; Note: AES is a symmetric-key algorithm which means it uses the same key during encryption/decryption. Generating key/iv pair. We want to generate a 256-bit key and use Cipher Block Chaining (CBC). AES (Advanced Encryption Standard) is a symmetric-key encryption algorithm. Symmetric-key algorithms are algorithms for cryptography that use the same cryptographic keys for both encryption of plaintext and decryption of ciphertext. How do or what is the best way to generate AES key using openssl programmatically? Saw recommendations using RANDbytes. I also come across this API — AESsetencryptkey(.). But the first parameter seems to be user’s encrypted key. So, I think you I need to generate an AES key first b4 calling this API. Please advise. Mar 12, 2020  Generating AES keys and password Use the OpenSSL command-line tool, which is included with InfoSphere® MDM, to generate AES 128-, 192-, or 256-bit keys. The madpwd3 utility is used to create the password.

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Branch:master

/*

* Copyright 2008-2016 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

*/

/*

* AES_encrypt/AES_decrypt are deprecated - but we need to use them to implement

* these functions

*/

#include'internal/deprecated.h'

#include'internal/cryptlib.h'

#include<openssl/aes.h>

#include<openssl/modes.h>

intAES_wrap_key(AES_KEY *key, constunsignedchar *iv,

unsignedchar *out,

constunsignedchar *in, unsignedint inlen)

{

returnCRYPTO_128_wrap(key, iv, out, in, inlen, (block128_f) AES_encrypt);

}

intAES_unwrap_key(AES_KEY *key, constunsignedchar *iv,

unsignedchar *out,

constunsignedchar *in, unsignedint inlen)

{

returnCRYPTO_128_unwrap(key, iv, out, in, inlen,

(block128_f) AES_decrypt);

}

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Symmetic encryption

For symmetic encryption, you can use the following:

To encrypt:

To decrypt:

Asymmetric encryption

For Asymmetric encryption you must first generate your private key and extract the public key.

To encrypt:

To decrypt:

Encripting files

You can't directly encrypt a large file using rsautl. Instead, do the following:

• Generate a key using openssl rand, e.g. openssl rand 32 -out keyfile.
• Encrypt the key file using openssl rsautl.
• Encrypt the data using openssl enc, using the generated key from step 1.
• Package the encrypted key file with the encrypted data. The recipient will need to decrypt the key with their private key, then decrypt the data with the resulting key.

Ultimate solution for safe and high secured encode anyone file in OpenSSL and command-line:

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Private key generation (encrypted private key):

With unecrypted private key:

With encrypted private key:

Openssl Generate Key File

With existing encrypted (unecrypted) private key:

Encrypt a file

Encrypt binary file:

Encrypt text file:

What is what:

• smime — ssl command for S/MIME utility (smime(1)).
• -encrypt — chosen method for file process.
• -binary — use safe file process. Normally the input message is converted to 'canonical' format as required by the S/MIME specification, this switch disable it. It is necessary for all binary files (like a images, sounds, ZIP archives).
• -aes-256-cbc — chosen cipher AES in 256 bit for encryption (strong). If not specified 40 bit RC2 is used (very weak). (Supported ciphers).
• -in plainfile.zip — input file name.
• -out encrypted.zip.enc — output file name.
• -outform DER — encode output file as binary. If is not specified, file is encoded by base64 and file size will be increased by 30%.
• yourSslCertificate.pem — file name of your certificate's. That should be in PEM format.

That command can very effectively a strongly encrypt any file regardless of its size or format.

Decrypt a file

Decrypt binary file:

For text files:

What is what:

• -inform DER — same as -outform above.
• -inkey private.key — file name of your private key. That should be in PEM format and can be encrypted by password.
• -passin pass:your_password — (optional) your password for private key encrypt.

Verification

Creating a signed digest of a file:

Verify a signed digest:

Source