sdk-rt-thread-source-code/bsp/CME_M7/StdPeriph_Driver/src/cmem7_aes.c

/**
	*****************************************************************************
	* @file     cmem7_aes.c
	*
	* @brief    CMEM7 AES source file
	*
	*
	* @version  V1.0
	* @date     3. September 2013
	*
	* @note               
	*           
	*****************************************************************************
	* @attention
	*
	* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
	* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
	* TIME. AS A RESULT, CAPITAL-MICRO SHALL NOT BE HELD LIABLE FOR ANY DIRECT, 
	* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
	* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
	* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
	*
	* <h2><center>&copy; COPYRIGHT 2013 Capital-micro </center></h2>
	*****************************************************************************
	*/
	
#include "cmem7_aes.h"

BOOL AES_Decrypt(const void *src, void *dst, uint32_t len)
{
	uint32_t *po = dst;
	const uint32_t *pi = src;

	if (len & 0xF)
		return FALSE;

	AES->FIFO_CLEAR = 1;
	AES->FIFO_CLEAR = 0;
	GLOBAL_CTRL->AES_BURST_TYPE = 0x1;						// Cannot be 0
	while (len > 0) {
		while (0 == GLOBAL_CTRL->AES_STATUS_b.IDLE);		// 0x41007010
		udelay(2);
		GLOBAL_CTRL->AES_TARGET_ADDR = (uint32_t)po;		// 0x41800000;
		po += 4;
		len -= 4 * sizeof(uint32_t);
		while (0 == GLOBAL_CTRL->AES_STATUS_b.RD_EMPTY);	// 0x41007010
		AES->FIFO = *pi++;
		AES->FIFO = *pi++;
		AES->FIFO = *pi++;
		AES->FIFO = *pi++;
	}
	return TRUE;
}