# Vault 7: Projects

This publication series is about specific projects related to the Vault 7 main publication.

### Protego

# MLA -- Crypto Library

1 January, 2012

- 1
- 2
…
- 50
- 51
- 52
- 53
- 54
…
- 119
- 120

// error
}
// Driver open call for the AES module
handle = DRV_AES_Open (DRV_AES_INDEX, 0);
if (handle != DRV_AES_HANDLE)
{
// error
}
//Create the AES round keys. This only needs to be done once for each AES key.
AES_RoundKeysCreate (&round_keys, (uint8_t*)AESKey128, AES_KEY_SIZE_128_BIT);
// Initialize the Block Cipher context with the AES module encryption/decryption functions
and the AES block size
BLOCK_CIPHER_CFB_Initialize (&context, AES_Encrypt, AES_Decrypt, AES_BLOCK_SIZE,
initialization_vector);
//Encrypt the data
BLOCK_CIPHER_CFB_Encrypt (handle, cipher_text, &num_bytes_encrypted, (void *) plain_text,
sizeof(plain_text), &round_keys, &context, BLOCK_CIPHER_OPTION_STREAM_START |
BLOCK_CIPHER_OPTION_USE_CFB1);
Parameters
Parameters Description
handle A handle that is passed to the block cipher's encrypt/decrypt
functions to specify which instance of the block cipher
module to use. This parameter can be specified as NULL if
the block cipher does not have multiple instances.
cipherText The cipher text produced by the encryption. This buffer must
be a multiple of the block size, even if the plain text buffer
size is not. This buffer should always be larger than the plain
text buffer.
numCipherBytes Pointer to a uint32_t; the number of bytes encrypted will be
returned in this parameter.
plainText The plain test to encrypt.
numPlainBytes The number of plain text bytes that must be encrypted. If the
number of plain text bytes encrypted is not evenly divisible
by the block size, the remaining bytes will be cached in the
CFB context structure until additional data is provided.
key The key to use when encrypting/decrypting the data. The
format of this key will depend on the block cipher you are
using.
context Pointer to a context structure for this encryption. The first call
of this function should have the context->initializationVector
set to the initializationVector. The same context structure
instance should be used for every call used for the same
data stream. The contents of this structure should not be
changed by the user once the encryption/decryption has
started.
1.7 Library Interface MLA - Crypto Library Help Block Cipher Modes
52

- 1
- 2
…
- 50
- 51
- 52
- 53
- 54
…
- 119
- 120