- 1 year ago
How do I use AES-GMAC with a secret in BCrypt?
BCrypt, the built-in password hashing function in bcrypt, does not support AES-GMAC directly. BCrypt is designed for password hashing and not for general-purpose cryptographic operations like AES-GMAC.
To use AES-GMAC with a secret, you would typically need to use a cryptographic library that provides support for AES-GMAC, such as OpenSSL or Cryptography. These libraries offer APIs that allow you to perform AES-GMAC encryption and decryption operations.
Here's an example of how you can use the Cryptography library in Python to perform AES-GMAC encryption and decryption:
pythonfrom cryptography.hazmat.primitives.ciphers.aead import AESGCM
from cryptography.hazmat.backends import default_backend
# Generate a random 256-bit key
key = b"your_secret_key"
# Create the AES-GCM cipher object
cipher = AESGCM(key)
# Plaintext to be encrypted
plaintext = b"your_data_to_encrypt"
# Generate a random 96-bit nonce (IV)
nonce = b"your_nonce"
# Encrypt the plaintext using AES-GCM
ciphertext = cipher.encrypt(nonce, plaintext, None)
# Decrypt the ciphertext using AES-GCM
decrypted_data = cipher.decrypt(nonce, ciphertext, None)
# Print the decrypted data
print(decrypted_data)
Note that this example uses the Cryptography library, which is a popular choice for cryptographic operations in Python. You will need to install the library using pip:
pip install cryptography
Make sure to adapt the code to your specific use case, including providing the correct secret key, nonce, and plaintext/ciphertext data.
Keep in mind that cryptographic operations can be complex and sensitive. It's important to understand the security requirements of your application and consult with a cryptographic expert when designing and implementing cryptographic functionality.