Accelerated CTR encryption
@param pt Plaintext
@param ct Ciphertext
@param blocks The number of complete blocks to process
@param IV The initial value (input/output)
@param mode little or big endian counter (mode=0 or mode=1)
@param skey The scheduled key context
@return CRYPT_OK if successful
Accelerated CTR encryption @param pt Plaintext @param ct Ciphertext @param blocks The number of complete blocks to process @param IV The initial value (input/output) @param mode little or big endian counter (mode=0 or mode=1) @param skey The scheduled key context @return CRYPT_OK if successful