1.12 CRYPT_AES_CTR_Encrypt Function

C

int CRYPT_AES_CTR_Encrypt(
CRYPT_AES_CTX* aes, 
unsigned char* out, 
const unsigned char* in, 
unsigned int inSz
);

Description

This function encrypts a block of data using the AES algorithm in Counter (CTR) mode.

Preconditions

Key and Initialization Vector (IV) must be set earlier with a call to CRYPT_AES_KeySet and CRYPT_AES_IvSet.

Parameters

ParametersDescription
aesPointer to context which saves state between calls.
outPointer to buffer to store the results of the encryption pass.
inPointer to buffer holding the data to be encrypted.
inSzSize of the input data, in bytes.

Returns

  • BAD_FUNC_ARG - An invalid pointer was passed to the function.

  • 0 - An invalid pointer was not passed to the function.

Remarks

The output buffer must be equal in size to the input buffer.

Example

CRYPT_AES_CTX mcAes;
int           ret;
byte          out1[AES_TEST_SIZE];

strncpy((char*)key, "1234567890abcdefghijklmnopqrstuv", 32);
strncpy((char*)iv,  "1234567890abcdef", 16);

ret = CRYPT_AES_KeySet(&mcAes, key, 16, iv, CRYPT_AES_ENCRYPTION);
ret = CRYPT_AES_CTR_Encrypt(&mcAes, out1, ourData, AES_TEST_SIZE);