密钥滚动 - 2023.2 简体中文

AES-GCM 还支持密钥滚动功能，其中整个加密镜像以较小的 AES 加密块/模块形式来展示。每个模块均使用其专用密钥进行加密。初始密钥存储在器件上的密钥源中，而每个后续模块的密钥则在前一个模块中进行加密（封装）。您可使用 Bootgen，通过密钥滚动来生成启动镜像。BIF 属性 blocks 可指定在创建多个较小的块以便加密时所采用的模式。

all:
{
	id_code = 0x04ca8093
	extended_id_code = 0x01
	id = 0x2

	metaheader
	{
		encryption = aes,
		keysrc = bbram_red_key,
		aeskeyfile = efuse_red_metaheader_key.nky,
		dpacm_enable
	}

	image
	{
		name = pmc_subsys, id = 0x1c000001
		partition
		{
			id = 0x01, type = bootloader,
			encryption = aes,
			keysrc = bbram_red_key,
			aeskeyfile = bbram_red_key.nky,
			dpacm_enable,
			blocks = 4096(2);1024;2048(2);4096(*),
			file = plm.elf
		}
		partition
		{
			id = 0x09, type = pmcdata, load = 0xf2000000,
			aeskeyfile = pmcdata.nky,
			file = pmc_data.cdo
		}
	}

	image
	{
		name = lpd, id = 0x4210002
		partition
		{
			id = 0x0C, type = cdo,
			encryption = aes,
			keysrc = bbram_red_key,
			aeskeyfile = key1.nky,
			dpacm_enable,
			blocks = 8192(20);4096(*),
			file = lpd_data.cdo
		}
		partition
		{
			id = 0x0B, core = psm,
			encryption = aes,
			keysrc = bbram_red_key,
			aeskeyfile = key2.nky,
			dpacm_enable,
			blocks = 4096(2);1024;2048(2);4096(*),
			file = psm_fw.elf
		}
	}

	image
	{
		name = fpd, id = 0x420c003
		partition
		{
			id = 0x08, type = cdo,
			encryption = aes,
			keysrc = bbram_red_key,
			aeskeyfile = key5.nky,
			dpacm_enable,
			blocks = 8192(20);4096(*),
			file = fpd_data.cdo
		}
	}
}