Vault 7: Projects
This publication series is about specific projects related to the Vault 7 main publication.
// 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_OFB_Initialize (&context, AES_Encrypt, AES_Decrypt, AES_BLOCK_SIZE,
initialization_vector, (void *)&keyStream, sizeof (keyStream));
//Generate 4 blocks of key stream
BLOCK_CIPHER_OFB_KeyStreamGenerate(handle, 4, &round_keys, &context,
BLOCK_CIPHER_OPTION_STREAM_START);
//Encrypt the data
BLOCK_CIPHER_OFB_Encrypt (handle, cipher_text,(void *) plain_text, sizeof(plain_text),
&round_keys, &context, BLOCK_CIPHER_OPTION_STREAM_CONTINUE);
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.
numBlocks The number of blocks of key stream that should be created.
context->keyStream should have enough space remaining to
handle this request.
key The key to use when generating this key stream. The format
of this key will depend on the block cipher you are using.
context Pointer to a context structure for this operation. The first call
of this function should have the context->initializationVector
set. This value will be incremented for each block request.
options Block cipher encryption options that the user can specify,
or'd together. If
BLOCK_CIPHER_OPTION_STREAM_START is not
specified then
BLOCK_CIPHER_OPTION_STREAM_CONTINUE is
assumed. Valid options for this function are
• BLOCK_CIPHER_OPTION_STREAM_START
• BLOCK_CIPHER_OPTION_STREAM_CONTINUE
Function
BLOCK_CIPHER_ERRORS BLOCK_CIPHER_OFB_KeyStreamGenerate (DRV_HANDLE handle,
uint32_t numBlocks, void * key, BLOCK_CIPHER_OFB_CONTEXT * context,
uint32_t options)
1.7.1.5.4 BLOCK_CIPHER_OFB_Encrypt Function
Encrypts plain text using output feedback mode.
File
block_cipher_mode_ofb.h
1.7 Library Interface MLA - Crypto Library Help Block Cipher Modes
59
Protego_Release_01_05-Related-OEM-Documentation-MLA_v2013_12_20-help_mla_crypto.pdf