- Key Generation Failed L Encrypt_aes Informix 12 10
- Key Generation Failed L Encrypt_aes Informix 12 10
An AES key is a random bitstring of the right length.
There are more attacks against improperly-chosen IVs than I've listed here. Generate a random IV for each message (using a cryptographic-quality random generator, the same you'd use to generate a key), and you'll be fine. There is one exception: if you generate a fresh key for each message, you can pick a predictable IV (all-bits 0 or whatever).
- For a 128-bit AES key you need 16 bytes.
- For a 256-bit AES key you need 32 bytes.
How can I securely convert a “string” password to a key used in AES? Ask Question Asked 6 years, 9 months ago. LShould I generate a key using PBKDF2? As I understand, I then also need to provide a salt. However, in my situation the salt seems unnecessary because I only have one key. – Four0hThree Jul 12 '13 at 17:41. As for the AES key, I am hashing the company GUID the database record belongs to using SHA256 (resulting in the same key on each server that is trying to decrypt the record from the DB) I am unable to use SQL encryption for various reasons and must use code for encryption/decryption. AES encryption is a web tool to encrypt and decrypt text using AES encryption algorithm. The tool is free, without registration. Column Encryption in Informix - SQL -26040: Encrypt VP initialization failed. We are using Informix as DB for our application. We have a new requirement to encrypt one column (ID) alone. The encryption should not be external and should be in DB itself.
If you need to generate your own AES key for encrypting data, you should use a good random source. The strength of the key depends on the unpredictability of the random.
Mbed TLS includes the CTR-DRBG module and an Entropy Collection module to help you with making an AES key generator for your key.
To use the AES generator, you need to have the modules enabled in the
config.h
files (MBEDTLS_CTR_DRBG_C
and MBEDTLS_ENTROPY_C
), see How do I configure Mbed TLS.Include the following headers in your code:
Then add the following variable definitions to your code:
The personalization string needs to be unique to your application to add randomness to your random sources.
Creating the AES key
You need to initialize the entropy pool and the random source and extract data for your key. In this case we generate 32 bytes (256 bits) of random data.
Now you can use the data in
key
as a 256-bit AES key.Did this help?
How to Encrypt and Decrypt a File
When you encrypt a file, the original file is not removed or changed.The output file is encrypted.
For solutions to common errors from the encrypt command,see the section that follows the examples.
- Create a symmetric key of the appropriatelength.You have two options. Youcan provide a passphrase from whicha key will be generated. Or you can provide a key.
- If you provide a passphrase, you must store or remember thepassphrase. If you store the passphrase online, the passphrase file shouldbe readable only by you.
- If you provide a key, it must be the correct size for themechanism. For the procedure, see How to Generate a Symmetric Key by Using the dd Command.
- Encrypta file.Provide a key and use a symmetric key algorithm with the encrypt command.
- -aalgorithm
- Is the algorithm to use to encrypt the file. Type the algorithmas the algorithm appears in the output of the encrypt -l command.
- -kkeyfile
- Is the file that contains a key of algorithm-specified length. The key length for each algorithm is listed, in bits, in the output of the encrypt -l command.
- -iinput-file
- Is the input file that you want to encrypt. This file is leftunchanged by the command.
- -ooutput-file
- Is the output file that is the encrypted form of the inputfile.
Example 14–11 Encrypting and Decrypting With AES and a Passphrase
In the following example, a file is encrypted with the AES algorithm.The key is generated from the passphrase. If the passphrase is stored in afile, the file should not be readable by anyone but the user.
The input file, ticket.to.ride, still exists inits original form.
To decrypt theoutput file, the user uses the same passphrase and encryption mechanism thatencrypted the file.
Example 14–12 Encrypting and Decrypting With AES and a Key File
In the following example, a file is encrypted with the AES algorithm.AES mechanisms use a key of 128 bits, or 16 bytes.
The input file, ticket.to.ride, still exists inits original form.
To decrypt the output file, the user uses the same key and encryptionmechanism that encrypted the file.
Example 14–13 Encrypting and Decrypting With ARCFOUR and a Key File
In the following example, a file is encrypted with the ARCFOUR algorithm.The ARCFOUR algorithm accepts a key of 8 bits (1 byte), 64 bits (8 bytes),or 128 bits (16 bytes).
To decrypt the output file, the user uses the same key and encryptionmechanism that encrypted the file.
Key Generation Failed L Encrypt_aes Informix 12 10
Example 14–14 Encrypting and Decrypting With 3DES and a Key File
In the following example, a file is encrypted with the 3DES algorithm.The 3DES algorithm requires a key of 192 bits, or 24 bytes.
To decrypt the output file, the user uses the same key and encryptionmechanism that encrypted the file.
Troubleshooting
Key Generation Failed L Encrypt_aes Informix 12 10
The following messages indicate that the key that you providedto the encrypt command is not permitted by the algorithmthat you are using.
- encrypt: unable to create key for crypto operation:CKR_ATTRIBUTE_VALUE_INVALID
- encrypt: failed to initialize crypto operation: CKR_KEY_SIZE_RANGE
If you pass a key that does not meet the requirements of the algorithm,you must supply a better key.
- One option is to use a passphrase. The framework then providesa key that meets the requirements.
- The second option is to pass a key size that the algorithmaccepts. For example, the DES algorithm requires a key of 64 bits. The 3DESalgorithm requires a key of 192 bits.