//由 https://github.com/wechat-miniprogram/sm-crypto/ 库修改
/* eslint-disable no-bitwise, no-mixed-operators, complexity */

const DECRYPT = 0
const ROUND = 32
const BLOCK = 16

const Sbox : number[] = [
	0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7, 0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05,
	0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3, 0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99,
	0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a, 0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62,
	0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95, 0x80, 0xdf, 0x94, 0xfa, 0x75, 0x8f, 0x3f, 0xa6,
	0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba, 0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8,
	0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b, 0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35,
	0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2, 0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87,
	0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52, 0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e,
	0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38, 0xb5, 0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1,
	0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55, 0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3,
	0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60, 0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f,
	0xd5, 0xdb, 0x37, 0x45, 0xde, 0xfd, 0x8e, 0x2f, 0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51,
	0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f, 0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8,
	0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd, 0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0,
	0x89, 0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e, 0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84,
	0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20, 0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39, 0x48
]

const CK : number[] = [
	0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269,
	0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9,
	0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249,
	0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,
	0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229,
	0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,
	0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209,
	0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279
] as number[];

/**
 * 16 进制串转字节数组
 */
export function hexToArray(str : string) : number[] {
	const arr : number[] = []
	for (let i = 0, len = str.length; i < len; i += 2) {
		arr.push(parseInt(str.substring(i, i + 2), 16))
	}
	return arr
}

/**
 * 将字节数组转换为16进制字符串
 *
 * @param arr 输入的字节数组
 * @returns 16进制表示的字符串，每个字节占2位
 */
export function arrayToHex(arr : number[]) : string {
	let hex = "";
	let str: string;
	for (let i = 0; i < arr.length; i++) {
		str = arr[i].toString(16);
		hex += str.length == 1 ? '0' + str : str
	}
	return hex;
}
/**
 * UTF-8字符串转字节数组
 * @param str 待转换的UTF-8字符串
 * @returns 字节数组
 */
export function utf8ToArray(str : string) : number[] {
	const arr : number[] = [];

	for (let i = 0, len = str.length; i < len; i++) {
		let point : number = str.charCodeAt(i) as number;

		if (point <= 0x007f) {
			// 单字节
			arr.push(point);
		} else if (point <= 0x07ff) {
			// 双字节
			arr.push(0xc0 | (point >>> 6)); // 110yyyyy
			arr.push(0x80 | (point & 0x3f)); // 10zzzzzz
		} else if (point <= 0xD7FF || (point >= 0xE000 && point <= 0xFFFF)) {
			// 三字节
			arr.push(0xe0 | (point >>> 12)); // 1110xxxx
			arr.push(0x80 | ((point >>> 6) & 0x3f)); // 10yyyyyy
			arr.push(0x80 | (point & 0x3f)); // 10zzzzzz
		} else if (point >= 0x010000 && point <= 0x10FFFF) {
			// 四字节
			i++;
			arr.push(0xf0 | (point >>> 18) & 0x07); // 11110www
			arr.push(0x80 | ((point >>> 12) & 0x3f)); // 10xxxxxx
			arr.push(0x80 | ((point >>> 6) & 0x3f)); // 10yyyyyy
			arr.push(0x80 | (point & 0x3f)); // 10zzzzzz
		} else {
			// 五、六字节，不支持
			arr.push(point);
			throw new Error('Input is not supported');
		}
	}

	return arr;
}


/**
 * 将字节数组转换为UTF-8字符串
 *
 * @param arr 输入的字节数组
 * @returns UTF-8编码的字符串
 */
export function arrayToUtf8(arr : number[]) : string {
	const str : string[] = [];
	for (let i = 0, len = arr.length; i < len; i++) {
		if (arr[i] >= 0xf0 && arr[i] <= 0xf7) {
			// 四字节
			str.push(String.fromCharCode(
				((arr[i] & 0x07) << 18) +
				((arr[i + 1] & 0x3f) << 12) +
				((arr[i + 2] & 0x3f) << 6) +
				(arr[i + 3] & 0x3f)
			));
			i += 3;
		} else if (arr[i] >= 0xe0 && arr[i] <= 0xef) {
			// 三字节
			str.push(String.fromCharCode(
				((arr[i] & 0x0f) << 12) +
				((arr[i + 1] & 0x3f) << 6) +
				(arr[i + 2] & 0x3f)
			));
			i += 2;
		} else if (arr[i] >= 0xc0 && arr[i] <= 0xdf) {
			// 双字节
			str.push(String.fromCharCode(
				((arr[i] & 0x1f) << 6) +
				(arr[i + 1] & 0x3f)
			));
			i++;
		} else {
			// 单字节
			str.push(String.fromCharCode(arr[i]));
		}
	}

	return str.join('');
}

/**
 * 32 比特循环左移
 */
function rotl(x : number, n : number) : number {
	const s = n & 31
	return (x << s) | (x >>> (32 - s))
}

/**
 * 非线性变换
 */
function byteSub(a : number) : number {
	return (Sbox[a >>> 24 & 0xFF] & 0xFF) << 24 |
		(Sbox[a >>> 16 & 0xFF] & 0xFF) << 16 |
		(Sbox[a >>> 8 & 0xFF] & 0xFF) << 8 |
		(Sbox[a & 0xFF] & 0xFF)
}

/**
 * 线性变换，加密/解密用
 */
function l1(b : number) : number {
	return b ^ rotl(b, 2) ^ rotl(b, 10) ^ rotl(b, 18) ^ rotl(b, 24)
}

/**
 * 线性变换，生成轮密钥用
 */
function l2(b : number) : number {
	return b ^ rotl(b, 13) ^ rotl(b, 23)
}

/**
 * 使用SMS4算法进行128比特的加密/解密操作
 * @param input 输入的字节数组，长度为16字节
 * @param output 输出的字节数组，长度为16字节
 * @param roundKey 加密轮密钥，长度为32字节
 */
function sms4Crypt(input : number[], output : number[], roundKey : number[]) {
	const x : number[] = [0, 0, 0, 0];

	// 字节数组转成字数组（此处 1 字 = 32 比特）
	const tmp : number[] = [0, 0, 0, 0];
	for (let i = 0; i < 4; i++) {
		tmp[0] = input[4 * i] & 0xff;
		tmp[1] = input[4 * i + 1] & 0xff;
		tmp[2] = input[4 * i + 2] & 0xff;
		tmp[3] = input[4 * i + 3] & 0xff;
		x[i] = tmp[0] << 24 | tmp[1] << 16 | tmp[2] << 8 | tmp[3];
	}

	// x[i + 4] = x[i] ^ l1(byteSub(x[i + 1] ^ x[i + 2] ^ x[i + 3] ^ roundKey[i]))
	for (let r = 0, mid : number; r < 32; r += 4) {
		mid = x[1] ^ x[2] ^ x[3] ^ roundKey[r];
		x[0] ^= l1(byteSub(mid)); // x[4]

		mid = x[2] ^ x[3] ^ x[0] ^ roundKey[r + 1];
		x[1] ^= l1(byteSub(mid)); // x[5]

		mid = x[3] ^ x[0] ^ x[1] ^ roundKey[r + 2];
		x[2] ^= l1(byteSub(mid)); // x[6]

		mid = x[0] ^ x[1] ^ x[2] ^ roundKey[r + 3];
		x[3] ^= l1(byteSub(mid)); // x[7]
	}

	// 反序变换
	for (let j = 0; j < 16; j += 4) {
		output[j] = x[3 - j / 4] >>> 24 & 0xff;
		output[j + 1] = x[3 - j / 4] >>> 16 & 0xff;
		output[j + 2] = x[3 - j / 4] >>> 8 & 0xff;
		output[j + 3] = x[3 - j / 4] & 0xff;
	}
}


/**
 * 密钥扩展算法
 */
function sms4KeyExt(key : number[], roundKey : number[], cryptflag : number) {
	const x = [0, 0, 0, 0];

	// 字节数组转成字数组（此处 1 字 = 32 比特）
	const tmp = [0, 0, 0, 0];
	for (let i = 0; i < 4; i++) {
		tmp[0] = key[0 + 4 * i] & 0xff as number
		tmp[1] = key[1 + 4 * i] & 0xff as number
		tmp[2] = key[2 + 4 * i] & 0xff as number
		tmp[3] = key[3 + 4 * i] & 0xff as number
		x[i] = tmp[0] << 24 | tmp[1] << 16 | tmp[2] << 8 | tmp[3]
	}

	// 与系统参数做异或
	x[0] ^= 0xa3b1bac6
	x[1] ^= 0x56aa3350
	x[2] ^= 0x677d9197
	x[3] ^= 0xb27022dc

	// roundKey[i] = x[i + 4] = x[i] ^ l2(byteSub(x[i + 1] ^ x[i + 2] ^ x[i + 3] ^ CK[i]))
	for (let r : number = 0, mid : number; r < 32; r += 4) {
		mid = x[1] ^ x[2] ^ x[3] ^ CK[r + 0]
		x[0] ^= l2(byteSub(mid)); // x[4]
		roundKey[r + 0] = x[0];

		mid = x[2] ^ x[3] ^ x[0] ^ CK[r + 1]
		x[1] ^= l2(byteSub(mid)) // x[5]
		roundKey[r + 1] = x[1]

		mid = x[3] ^ x[0] ^ x[1] ^ CK[r + 2]
		x[2] ^= l2(byteSub(mid)) // x[6]
		roundKey[r + 2] = x[2]

		mid = x[0] ^ x[1] ^ x[2] ^ CK[r + 3]
		x[3] ^= l2(byteSub(mid)) // x[7]
		roundKey[r + 3] = x[3]
	}

	// 解密时使用反序的轮密钥
	if (cryptflag === DECRYPT) {
		for (let r = 0, mid : number; r < 16; r++) {
			mid = roundKey[r]
			roundKey[r] = roundKey[31 - r]
			roundKey[31 - r] = mid
		}
	}
}

/* function sm4(inArray, key : string | number[], cryptflag, {
	padding = 'pkcs#7', mode = '', iv = [] as number[], output = 'string'
} = {}) {
	if (mode === 'cbc') {
		// CBC 模式，默认走 ECB 模式
		if (typeof iv === 'string') iv = hexToArray(iv)
		if (iv.length !== (128 / 8)) {
			// iv 不是 128 比特
			throw new Error('iv is invalid')
		}
	}

	// 检查 key
	if (typeof key === 'string') key = hexToArray(key)
	if (key.length !== (128 / 8)) {
		// key 不是 128 比特
		throw new Error('key is invalid')
	}

	// 检查输入
	if (typeof inArray === 'string') {
		if (cryptflag !== DECRYPT) {
			// 加密，输入为 utf8 串
			inArray = utf8ToArray(inArray)
		} else {
			// 解密，输入为 16 进制串
			inArray = hexToArray(inArray)
		}
	} else {
		inArray = [...inArray]
	}

	// 新增填充，sm4 是 16 个字节一个分组，所以统一走到 pkcs#7
	if ((padding === 'pkcs#5' || padding === 'pkcs#7') && cryptflag !== DECRYPT) {
		//加密
		const paddingCount = BLOCK - inArray.length % BLOCK
		for (let i = 0; i < paddingCount; i++) inArray.push(paddingCount)
	}

	// 生成轮密钥
	const roundKey : number[] = new Array(ROUND)
	sms4KeyExt(key, roundKey, cryptflag)

	const outArray = []
	let lastVector = iv
	let restLen = inArray.length
	let point = 0
	while (restLen >= BLOCK) {
		const input = inArray.slice(point, point + 16)
		const output = new Array(16)

		if (mode === 'cbc') {
			for (let i = 0; i < BLOCK; i++) {
				if (cryptflag !== DECRYPT) {
					// 加密过程在组加密前进行异或
					input[i] ^= lastVector[i]
				}
			}
		}

		sms4Crypt(input, output, roundKey)


		for (let i = 0; i < BLOCK; i++) {
			if (mode === 'cbc') {
				if (cryptflag === DECRYPT) {
					// 解密过程在组解密后进行异或
					output[i] ^= lastVector[i]
				}
			}

			outArray[point + i] = output[i]
		}

		if (mode === 'cbc') {
			if (cryptflag !== DECRYPT) {
				// 使用上一次输出作为加密向量
				lastVector = output
			} else {
				// 使用上一次输入作为解密向量
				lastVector = input
			}
		}

		restLen -= BLOCK
		point += BLOCK
	}

	// 去除填充，sm4 是 16 个字节一个分组，所以统一走到 pkcs#7
	if ((padding === 'pkcs#5' || padding === 'pkcs#7') && cryptflag === DECRYPT) {
		const len = outArray.length
		const paddingCount = outArray[len - 1]
		for (let i = 1; i <= paddingCount; i++) {
			if (outArray[len - i] !== paddingCount) throw new Error('padding is invalid')
		}
		outArray.splice(len - paddingCount, paddingCount)
	}

	// 调整输出
	if (output !== 'array') {
		if (cryptflag !== DECRYPT) {
			// 加密，输出转 16 进制串
			return ArrayToHex(outArray)
		} else {
			// 解密，输出转 utf8 串
			return arrayToUtf8(outArray)
		}
	} else {
		return outArray
	}
}

export default {
	encrypt(inArray, key, options) {
		return sm4(inArray, key, 1, options)
	},
	decrypt(inArray, key, options) {
		return sm4(inArray, key, 0, options)
	}
} */
/**
 * SM4加密
 * @param {string} data 原始字符串
 * @param {string} key 密钥 16 进制字符串要求为 128 比特
 * @returns {string} 返回加密后16进制字符串
 */
export const sm4_encrypt = (data : string, key : string) : string => {
	let dataArray = utf8ToArray(data);
	let keyArray = hexToArray(key);
	if (keyArray.length !== (128 / 8)) {
		throw new Error('key is invalid')
	}
	const paddingCount = BLOCK - dataArray.length % BLOCK
	for (let i = 0; i < paddingCount; i++) dataArray.push(paddingCount)
	// 生成轮密钥
	const roundKey : number[] = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
	sms4KeyExt(keyArray, roundKey, 1);
	let outArray : number[] = [];
	let restLen = dataArray.length
	let point = 0
	while (restLen >= BLOCK) {
		const input = dataArray.slice(point, point + 16)
		const output = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
		sms4Crypt(input, output, roundKey)
		for (let i = 0; i < BLOCK; i++) {
			outArray.push(output[i]);
		}
		restLen -= BLOCK;
		point += BLOCK;
	}
	return arrayToHex(outArray)
}

/**
 * SM4解密
 * @param {string} data 要解密的16进制字符串
 * @param {string} key 密钥 16 进制字符串要求为 128 比特
 * @returns {string} 返回解密后的文本
 */
export const sm4_decrypt = (data : string, key : string) : string => {
	let keyArray = hexToArray(key);
	if (keyArray.length !== (128 / 8)) {
		// key 不是 128 比特
		throw new Error('key is invalid');
	}
	let dataArray = hexToArray(data)
	const roundKey : number[] = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
	sms4KeyExt(keyArray, roundKey, 0);
	let outArray : number[] = [];
	let restLen = dataArray.length
	let point = 0
	while (restLen >= BLOCK) {
		const input = dataArray.slice(point, point + 16)
		const output = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
		sms4Crypt(input, output, roundKey)
		for (let i = 0; i < BLOCK; i++) {
			outArray.push(output[i]);
		}
		restLen -= BLOCK
		point += BLOCK
	}
	const len = outArray.length
	const paddingCount = outArray[len - 1]
	for (let i = 1; i <= paddingCount; i++) {
		if (outArray[len - i] !== paddingCount) throw new Error('padding is invalid')
	}
	outArray.splice(len - paddingCount, paddingCount)
	return arrayToUtf8(outArray);
}
/**
 * SM4加密
 * @param {string} data 原始字符串
 * @param {string} key 密钥 16 进制字符串要求为 128 比特
 * @param {string} vi 密钥 16 进制字符串要求为 128 比特
 * @returns {string} 返回解密后的文本
 */
export const sm4_encrypt_cbc = (data : string, key : string, iv : string) : string => {
	let dataArray = utf8ToArray(data)
	let ivArray = hexToArray(iv)
	if (ivArray.length !== (128 / 8)) {
		// iv 不是 128 比特
		throw new Error('iv is invalid')
	}
	let keyArray = hexToArray(key)
	if (keyArray.length !== (128 / 8)) {
		// key 不是 128 比特
		throw new Error('key is invalid')
	}

	const paddingCount = BLOCK - dataArray.length % BLOCK
	for (let i = 0; i < paddingCount; i++) dataArray.push(paddingCount)
	const roundKey : number[] = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
	sms4KeyExt(keyArray, roundKey, 1)

	const outArray : number[] = []
	let restLen = dataArray.length
	let point = 0
	while (restLen >= BLOCK) {
		const input = dataArray.slice(point, point + 16)
		const output = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
		for (let i = 0; i < BLOCK; i++) {
			input[i] ^= ivArray[i]
		}
		sms4Crypt(input, output, roundKey)
		for (let i = 0; i < BLOCK; i++) {
			outArray.push(output[i]);
		}
		ivArray = output
		restLen -= BLOCK
		point += BLOCK
	}
	return arrayToHex(outArray)

}
/**
 * SM4解密
 * @param {string} data 要解密的16进制字符串
 * @param {string} key 密钥 16 进制字符串要求为 128 比特
 * @param {string} vi 密钥 16 进制字符串要求为 128 比特
 * @returns {string} 返回解密后的文本
 */
export const sm4_decrypt_cbc = (data : string, key : string, iv : string) : string => {
	let dataArray = hexToArray(data)
	let ivArray = hexToArray(iv)
	if (ivArray.length !== (128 / 8)) {
		// iv 不是 128 比特
		throw new Error('iv is invalid')
	}
	let keyArray = hexToArray(key)
	if (keyArray.length !== (128 / 8)) {
		// key 不是 128 比特
		throw new Error('key is invalid')
	}
	// 生成轮密钥
	const roundKey : number[] = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
	sms4KeyExt(keyArray, roundKey, 0)
	let outArray : number[] = [];
	let restLen = dataArray.length
	let point = 0
	while (restLen >= BLOCK) {
		const input = dataArray.slice(point, point + 16)
		const output =  [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
		sms4Crypt(input, output, roundKey)
		for (let i = 0; i < BLOCK; i++) {
			output[i] ^= ivArray[i]
			outArray.push(output[i]);
		}
		// 使用上一次输入作为解密向量
		ivArray = input
		restLen -= BLOCK
		point += BLOCK
	}

	// 去除填充，sm4 是 16 个字节一个分组，所以统一走到 pkcs#7
	const len = outArray.length
	const paddingCount = outArray[len - 1]
	for (let i = 1; i <= paddingCount; i++) {
		if (outArray[len - i] !== paddingCount){
			throw new Error('padding is invalid')
		} 
	}
	outArray.splice(len - paddingCount, paddingCount);
	return arrayToUtf8(outArray)

}