C++ (Cpp) aes_838_decrypt示例

示例#1

文件： images.c 项目： codeordie/iphonelinux

unsigned int images_read(Image* image, void** data) {
	if(image == NULL) {
		*data = NULL;
		return 0;
	}

	*data = malloc(image->padded);
	if(!IsImg3) {
		nor_read(*data, image->offset + sizeof(Img2Header), image->length);
		aes_838_decrypt(*data, image->length, NULL);
		return image->length;
	} else {
		nor_read(*data, image->offset, image->padded);

		uint32_t dataOffset = 0;
		uint32_t dataLength = 0;
		uint32_t kbagOffset = 0;
		uint32_t kbagLength = 0;
		uint32_t offset = (uint32_t)(*data + sizeof(AppleImg3RootHeader));
		while((offset - (uint32_t)(*data + sizeof(AppleImg3RootHeader))) < image->length) {
			AppleImg3Header* header = (AppleImg3Header*) offset;
			if(header->magic == IMG3_DATA_MAGIC) {
				dataOffset = offset + sizeof(AppleImg3Header);
				dataLength = header->dataSize;
			}
			if(header->magic == IMG3_KBAG_MAGIC) {
				kbagOffset = offset + sizeof(AppleImg3Header);
				kbagLength = header->dataSize;
			}
			offset += header->size;
		}

		AppleImg3KBAGHeader* kbag = (AppleImg3KBAGHeader*) kbagOffset;

    if(kbag != 0) {
      if(kbag->key_modifier == 1) {
        aes_decrypt((void*)(kbagOffset + sizeof(AppleImg3KBAGHeader)), 16 + (kbag->key_bits / 8), AESGID, NULL, NULL);
      }

      aes_decrypt((void*)dataOffset, (dataLength / 16) * 16, AESCustom, (uint8_t*)(kbagOffset + sizeof(AppleImg3KBAGHeader) + 16), (uint8_t*)(kbagOffset + sizeof(AppleImg3KBAGHeader)));
    }

		uint8_t* newBuf = malloc(dataLength);
		memcpy(newBuf, (void*)dataOffset, dataLength);
		free(*data);
		*data = newBuf;

		return dataLength;
	}
}

示例#2

文件： images.c 项目： Cephrus/openiBoot

unsigned int images_read(Image* image, void** data) {
	if(image == NULL) {
		*data = NULL;
		return 0;
	}

	mtd_t *dev = images_device();
	if(!dev)
	{
		*data = NULL;
		return 0;
	}

	mtd_prepare(dev);

	*data = malloc(image->padded);
	if(!IsImg3) {
		mtd_read(dev, *data, image->offset + sizeof(Img2Header), image->length);
		aes_838_decrypt(*data, image->length, NULL);
		mtd_finish(dev);
		return image->length;
	} else {
		mtd_read(dev, *data, image->offset, image->padded);

		uint32_t dataOffset = 0;
		uint32_t dataLength = 0;
		uint32_t kbagOffset = 0;
		uint32_t kbagLength = 0;
		uint32_t offset = (uint32_t)(*data + sizeof(AppleImg3RootHeader));
		while((offset - (uint32_t)(*data + sizeof(AppleImg3RootHeader))) < image->length) {
			AppleImg3Header* header = (AppleImg3Header*) offset;
			if(header->magic == IMG3_DATA_MAGIC) {
				dataOffset = offset + sizeof(AppleImg3Header);
				dataLength = header->dataSize;
			}
			if(header->magic == IMG3_KBAG_MAGIC) {
				kbagOffset = offset + sizeof(AppleImg3Header);
				kbagLength = header->dataSize;
			}
			offset += header->size;
		}

		AppleImg3KBAGHeader* kbag = (AppleImg3KBAGHeader*) kbagOffset;

		if(kbag != 0) {
			if(kbag->key_modifier == 1) {
				aes_decrypt((void*)(kbagOffset + sizeof(AppleImg3KBAGHeader)), 16 + (kbag->key_bits / 8), AESGID, NULL, 0, NULL);
			}

			AESKeyLen keyLen;
			switch(kbag->key_bits)
			{
				case 128:
					keyLen = AES128;
					break;
				case 192:
					keyLen = AES192;
					break;
				case 256:
					keyLen = AES256;
					break;
				default:
					keyLen = AES128;
					break;
			}

			aes_decrypt((void*)dataOffset, (dataLength / 16) * 16, AESCustom, (uint8_t*)(kbagOffset + sizeof(AppleImg3KBAGHeader) + 16), keyLen, (uint8_t*)(kbagOffset + sizeof(AppleImg3KBAGHeader)));
		}

		uint8_t* newBuf = malloc(dataLength);
		memcpy(newBuf, (void*)dataOffset, dataLength);
		free(*data);
		*data = newBuf;

		mtd_finish(dev);
		return dataLength;
	}
}