加解密算法库框架开发指导
说明
本开发指导基于API version 9,OH SDK版本3.2.7以上,适用于JS语言开发
使用密钥对象生成与转换操作
场景说明
使用密钥生成操作中,典型的场景有:
- 随机生成算法库密钥对象。该对象可用于后续的加解密等操作。
- 根据指定数据生成算法库密钥对象(也就是将外部或存储的二进制数据转换为算法库的密钥对象)。该对象可用于后续的加解密等操作。
- 获取算法库密钥对象的二进制数据,用于存储或传输。
说明:密钥对象Key包括对称密钥SymKey和非对称密钥(公钥PubKey和私钥PriKey),其中公钥和私钥组成密钥对KeyPair。密钥之间的具体关系可参考API参考。
接口及参数说明
详细接口说明可参考API参考。
以上场景涉及的常用接口如下表所示:
实例名 | 接口名 | 描述 |
---|---|---|
cryptoFramework | createAsyKeyGenerator(algName : string) : AsyKeyGenerator | 根据algName设置的非对称密钥规格,创建非对称密钥生成器对象 |
cryptoFramework | createSymKeyGenerator(algName : string) : SymKeyGenerator | 根据algName设置的对称密钥规格,创建对称密钥生成器对象 |
AsyKeyGenerator | generateKeyPair(callback : AsyncCallback<KeyPair>) : void | 使用callback方式,随机生成非对称密钥对象KeyPair |
AsyKeyGenerator | generateKeyPair() : Promise<KeyPair> | 使用Promise方式,随机生成非对称密钥对象KeyPair |
SymKeyGenerator | generateSymKey(callback : AsyncCallback<SymKey>) : void | 使用callback方式,随机生成对称密钥对象SymKey |
SymKeyGenerator | generateSymKey() : Promise<SymKey> | 使用Promise方式,随机生成对称密钥对象SymKey |
AsyKeyGenerator | convertKey(pubKey : DataBlob, priKey : DataBlob, callback : AsyncCallback<KeyPair>) : void | 使用callback方式,根据指定的公钥和私钥二进制数据生成KeyPair对象 (允许公钥/私钥为null,即只传入单一公钥或私钥,生成只携带公钥或私钥的KeyPair对象) |
AsyKeyGenerator | convertKey(pubKey : DataBlob, priKey : DataBlob) : Promise<KeyPair> | 使用Promise方式,根据指定的公钥和私钥二进制数据生成KeyPair对象 (允许公钥/私钥为null,即只传入单一公钥或私钥,生成只携带公钥或私钥的KeyPair对象) |
SymKeyGenerator | convertKey(key : DataBlob, callback : AsyncCallback<SymKey>) : void | 使用callback方式,根据指定的二进制数据,生成对称密钥对象SymKey |
SymKeyGenerator | convertKey(pubKey : DataBlob, priKey : DataBlob) : Promise<KeyPair> | 使用Promise方式,根据指定的二进制数据,生成对称密钥对象SymKey |
Key | getEncoded() : DataBlob; | 获取Key密钥对象的二进制数据(Key的子类实例包括对称密钥SymKey、公钥PubKey、私钥PriKey) |
开发步骤
示例1:随机生成非对称密钥KeyPair,并获得二进制数据(场景1、3)
- 创建非对称密钥生成器;
- 通过非对称密钥生成器随机生成非对称密钥;
- 获取密钥对象的二进制数据;
以使用Promise方式随机生成RSA密钥(1024位,素数个数为2)为例:
import cryptoFramework from '@ohos.security.cryptoFramework';
function generateAsyKey() {
// 创建非对称密钥生成器
let rsaGenerator = cryptoFramework.createAsyKeyGenerator("RSA1024|PRIMES_2");
// 通过非对称密钥生成器,随机生成非对称密钥
let keyGenPromise = rsaGenerator.generateKeyPair();
keyGenPromise.then( keyPair => {
globalKeyPair = keyPair;
let pubKey = globalKeyPair.pubKey;
let priKey = globalKeyPair.priKey;
// 获取非对称密钥的二进制数据
pkBlob = pubKey.getEncoded();
skBlob = priKey.getEncoded();
AlertDialog.show({ message : "pk bin data" + pkBlob.data} );
AlertDialog.show({ message : "sk bin data" + skBlob.data} );
})
}
示例2:随机生成对称密钥SymKey,并获得二进制数据(场景1、3)
- 创建对称密钥生成器;
- 通过对称密钥生成器随机生成对称密钥;
- 获取算法库密钥对象的二进制数据;
以使用Promise方式随机生成AES密钥(256位)为例:
import cryptoFramework from '@ohos.security.cryptoFramework';
// 字节流以16进制输出
function uint8ArrayToShowStr(uint8Array) {
return Array.prototype.map
.call(uint8Array, (x) => ('00' + x.toString(16)).slice(-2))
.join('');
}
function testGenerateAesKey() {
// 创建对称密钥生成器
let symKeyGenerator = cryptoFramework.createSymKeyGenerator('AES256');
// 通过密钥生成器随机生成对称密钥
let promiseSymKey = symKeyGenerator.generateSymKey();
promiseSymKey.then( key => {
// 获取对称密钥的二进制数据,输出长度为256bit的字节流
let encodedKey = key.getEncoded();
console.info('key hex:' + uint8ArrayToShowStr(encodedKey.data));
})
}
示例3:根据指定的RSA非对称密钥二进制数据,生成KeyPair对象(场景2)
- 获取RSA公钥或私钥二进制数据,公钥需满足ASN.1语法、X.509规范、DER编码格式,私钥需满足ASN.1语法、PKCS#8规范、DER编码格式。
- 创建AsyKeyGenerator对象,调用convertKey方法,传入公钥二进制和私钥二进制(二者非必选项,可只传入其中一个),转换为KeyPair对象。
import cryptoFramework from '@ohos.security.cryptoFramework';
function convertAsyKey() {
let rsaGenerator = cryptoFramework.createAsyKeyGenerator("RSA1024");
let pkval = new Uint8Array([48,129,159,48,13,6,9,42,134,72,134,247,13,1,1,1,5,0,3,129,141,0,48,129,137,2,129,129,0,174,203,113,83,113,3,143,213,194,79,91,9,51,142,87,45,97,65,136,24,166,35,5,179,42,47,212,79,111,74,134,120,73,67,21,19,235,80,46,152,209,133,232,87,192,140,18,206,27,106,106,169,106,46,135,111,118,32,129,27,89,255,183,116,247,38,12,7,238,77,151,167,6,102,153,126,66,28,253,253,216,64,20,138,117,72,15,216,178,37,208,179,63,204,39,94,244,170,48,190,21,11,73,169,156,104,193,3,17,100,28,60,50,92,235,218,57,73,119,19,101,164,192,161,197,106,105,73,2,3,1,0,1]);
let pkBlob = {data : pkval};
rsaGenerator.convertKey(pkBlob, null, function(err, keyPair) {
if (keyPair == null) {
AlertDialog.show({message : "Convert keypair fail"});
}
AlertDialog.show({message : "Convert KeyPair success"});
})
}
说明
当前convertKey操作,公钥只支持转换满足X.509规范的DER格式,私钥只支持PKCS#8规范的DER格式;
示例4:根据指定的ECC非对称密钥二进制数据,生成KeyPair对象(场景2、3)
- 获取ECC二进制密钥数据,封装成DataBlob对象。
- 调用convertKey方法,传入公钥二进制和私钥二进制(二者非必选项,可只传入其中一个),转换为KeyPair对象。
import cryptoFramework from "@ohos.security.cryptoFramework"
function convertEccAsyKey() {
let pubKeyArray = new Uint8Array([48,89,48,19,6,7,42,134,72,206,61,2,1,6,8,42,134,72,206,61,3,1,7,3,66,0,4,83,96,142,9,86,214,126,106,247,233,92,125,4,128,138,105,246,162,215,71,81,58,202,121,26,105,211,55,130,45,236,143,55,16,248,75,167,160,167,106,2,152,243,44,68,66,0,167,99,92,235,215,159,239,28,106,124,171,34,145,124,174,57,92]);
let priKeyArray = new Uint8Array([48,49,2,1,1,4,32,115,56,137,35,207,0,60,191,90,61,136,105,210,16,27,4,171,57,10,61,123,40,189,28,34,207,236,22,45,223,10,189,160,10,6,8,42,134,72,206,61,3,1,7]);
let pubKeyBlob = { data: pubKeyArray };
let priKeyBlob = { data: priKeyArray };
let generator = cryptoFramework.createAsyKeyGenerator("ECC256");
generator.convertKey(pubKeyBlob, priKeyBlob, (error, data) => {
if (error) {
AlertDialog.show({message : "Convert keypair fail"});
}
AlertDialog.show({message : "Convert KeyPair success"});
})
}
示例5:根据指定的对称密钥二进制数据,生成SymKey对象(场景2、3)
- 创建对称密钥生成器;
- 通过对称密钥生成器,根据指定的对称密钥二进制数据,生成SymKey对象;
- 获取算法库密钥对象的二进制数据;
以使用callback方式生成3DES密钥(3DES密钥只能为192位)为例:
import cryptoFramework from '@ohos.security.cryptoFramework';
// 字节流以16进制输出
function uint8ArrayToShowStr(uint8Array) {
return Array.prototype.map
.call(uint8Array, (x) => ('00' + x.toString(16)).slice(-2))
.join('');
}
function genKeyMaterialBlob() {
let arr = [
0xba, 0x3d, 0xc2, 0x71, 0x21, 0x1e, 0x30, 0x56,
0xad, 0x47, 0xfc, 0x5a, 0x46, 0x39, 0xee, 0x7c,
0xba, 0x3b, 0xc2, 0x71, 0xab, 0xa0, 0x30, 0x72]; // keyLen = 192 (24 bytes)
let keyMaterial = new Uint8Array(arr);
return {data : keyMaterial};
}
function testConvertAesKey() {
// 生成对称密钥生成器
let symKeyGenerator = cryptoFramework.createSymKeyGenerator('3DES192');
// 根据用户指定的数据,生成对称密钥
let keyMaterialBlob = genKeyMaterialBlob();
try {
symKeyGenerator.convertKey(keyMaterialBlob, (error, key) => {
if (error) { // 业务逻辑执行错误通过callback的第一个参数返回错误信息
console.error(`convertKey error, ${error.code}, ${error.message}`);
return;
}
console.info(`key algName: ${key.algName}`);
console.info(`key format: ${key.format}`);
let encodedKey = key.getEncoded(); // 获取对称密钥的二进制数据,输出长度为192bit的字节流
console.info('key getEncoded hex: ' + uint8ArrayToShowStr(encodedKey.data));
})
} catch (error) { // 参数检查的错误以同步的方式立即抛出异常
console.error(`convertKey failed, ${error.code}, ${error.message}`);
return;
}
}
使用加解密操作
场景说明
在数据存储或传输场景中,可以使用加解密操作用于保证数据的机密性,防止敏感数据泄露。使用加解密操作中,典型的场景有:
- 使用对称密钥的加解密操作
- 使用非对称密钥的加解密操作
接口及参数说明
详细接口说明可参考API参考。
由于密码算法的复杂性,在选取不同规格和参数时,开发差异较大,无法通过代码示例一一列举,请仔细阅读API参考资料中的相关接口,确保使用正确。
以上场景设计的常用接口如下表所示:
实例名 | 接口名 | 描述 |
---|---|---|
cryptoFramework | createCipher(transformation : string) : Cipher | 根据transformation设置的算法参数创建Cipher对象 |
Cipher | init(opMode : CryptoMode, key : Key, params : ParamsSpec, callback : AsyncCallback<void>) : void | 使用callback方式设置密钥并初始化Cipher对象 |
Cipher | init(opMode : CryptoMode, key : Key, params : ParamsSpec) : Promise<void> | 使用Promise方式设置密钥并初始化Cipher对象 |
Cipher | update(data : DataBlob, callback : AsyncCallback<DataBlob>) : void | 使用callback方式添加加解密数据 |
Cipher | update(data : DataBlob) : Promise<DataBlob> | 使用Promise方式添加加解密数据 |
Cipher | doFinal(data : DataBlob, callback : AsyncCallback<DataBlob>) : void | 使用callback方式结束对所有数据的加解密 |
Cipher | doFinal(data : DataBlob) : Promise<DataBlob> | 使用Promise方式结束对所有数据的加解密 |
开发步骤
示例1:使用对称密钥的加解密操作
- 创建对称密钥生成器。
- 通过密钥生成器生成对称密钥。
- 创建加解密生成器。
- 通过加解密生成器加密或解密数据。
以AES GCM以Promise方式加解密为例:
import cryptoFramework from '@ohos.security.cryptoFramework';
var globalCipher;
var globalGcmParams;
var globalKey;
var globalCipherText;
function genGcmParamsSpec() {
let arr = [0, 0, 0, 0 , 0, 0, 0, 0, 0, 0 , 0, 0]; // 12 bytes
let dataIv = new Uint8Array(arr);
let ivBlob = {data : dataIv};
arr = [0, 0, 0, 0 , 0, 0, 0, 0]; // 8 bytes
let dataAad = new Uint8Array(arr);
let aadBlob = {data : dataAad};
arr = [0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0]; // 16 bytes
let dataTag = new Uint8Array(arr);
let tagBlob = {data : dataTag}; // GCM的authTag在加密时从doFinal结果中获取,在解密时填入init函数的params参数中
let gcmParamsSpec = {iv : ivBlob, aad : aadBlob, authTag : tagBlob, algName : "GcmParamsSpec"};
return gcmParamsSpec;
}
// 可理解的字符串转成字节流
function stringToUint8Array(str) {
let arr = [];
for (let i = 0, j = str.length; i < j; ++i) {
arr.push(str.charCodeAt(i));
}
return new Uint8Array(arr);
}
// 字节流以16进制输出
function uint8ArrayToShowStr(uint8Array) {
return Array.prototype.map
.call(uint8Array, (x) => ('00' + x.toString(16)).slice(-2))
.join('');
}
// 字节流转成可理解的字符串
function uint8ArrayToString(array) {
let arrayString = '';
for (let i = 0; i < array.length; i++) {
arrayString += String.fromCharCode(array[i]);
}
return arrayString;
}
function genKeyMaterialBlob() {
let arr = [
0xba, 0x3d, 0xc2, 0x71, 0x21, 0x1e, 0x30, 0x56,
0xad, 0x47, 0xfc, 0x5a, 0x46, 0x39, 0xee, 0x7c,
0xba, 0x3b, 0xc2, 0x71, 0xab, 0xa0, 0x30, 0x72]; // keyLen = 192 (24 bytes)
let keyMaterial = new Uint8Array(arr);
return {data : keyMaterial};
}
// AES GCM模式示例,自动生成密钥(promise写法)
function testAesGcm() {
return new Promise((resolve, reject) => {
setTimeout(() => {
resolve('testAesGcm');
}, 10)
}).then(() => {
// 生成对称密钥生成器
let symAlgName = 'AES128';
let symKeyGenerator = cryptoFramework.createSymKeyGenerator(symAlgName);
if (symKeyGenerator == null) {
console.error('createSymKeyGenerator failed');
return;
}
console.info(`symKeyGenerator algName: ${symKeyGenerator.algName}`);
// 通过密钥生成器随机生成128位长度的对称密钥
let promiseSymKey = symKeyGenerator.generateSymKey();
// 构造参数
globalGcmParams = genGcmParamsSpec();
// 生成加解密生成器
let cipherAlgName = 'AES128|GCM|PKCS7';
try {
globalCipher = cryptoFramework.createCipher(cipherAlgName);
console.info(`cipher algName: ${globalCipher.algName}`);
} catch (error) {
console.error(`createCipher failed, ${error.code}, ${error.message}`);
return;
}
return promiseSymKey;
}).then(key => {
let encodedKey = key.getEncoded();
console.info('key hex:' + uint8ArrayToShowStr(encodedKey.data));
globalKey = key;
return key;
}).then(key => {
// 初始化加解密操作环境:开始加密
let mode = cryptoFramework.CryptoMode.ENCRYPT_MODE;
let promiseInit = globalCipher.init(mode, key, globalGcmParams); // init
return promiseInit;
}).then(() => {
let plainText = {data : stringToUint8Array('this is test!')};
let promiseUpdate = globalCipher.update(plainText); // update
return promiseUpdate;
}).then(updateOutput => {
globalCipherText = updateOutput;
let promiseFinal = globalCipher.doFinal(null); // doFinal
return promiseFinal;
}).then(authTag => {
// GCM模式需要从doFinal的输出中取出加密后的认证信息并填入globalGcmParams,在解密时传入init()
globalGcmParams.authTag = authTag;
return;
}).then(() => {
// 初始化加解密操作环境:开始解密
let mode = cryptoFramework.CryptoMode.DECRYPT_MODE;
let promiseInit = globalCipher.init(mode, globalKey, globalGcmParams); // init
return promiseInit;
}).then(() => {
let promiseUpdate = globalCipher.update(globalCipherText); // update
return promiseUpdate;
}).then(updateOutput => {
console.info('decrypt plainText: ' + uint8ArrayToString(updateOutput.data));
let promiseFinal = globalCipher.doFinal(null); // doFinal
return promiseFinal;
}).then(finalOutput => {
if (finalOutput == null) { // 使用finalOutput.data前,先判断结果是否为null
console.info('GCM finalOutput is null');
}
}).catch(error => {
console.error(`catch error, ${error.code}, ${error.message}`);
})
}
以3DES ECB以callback方式加解密(采用已有数据生成密钥)为例:
import cryptoFramework from '@ohos.security.cryptoFramework';
var globalCipher;
var globalGcmParams;
var globalKey;
var globalCipherText;
// 可理解的字符串转成字节流
function stringToUint8Array(str) {
let arr = [];
for (let i = 0, j = str.length; i < j; ++i) {
arr.push(str.charCodeAt(i));
}
return new Uint8Array(arr);
}
// 字节流以16进制输出
function uint8ArrayToShowStr(uint8Array) {
return Array.prototype.map
.call(uint8Array, (x) => ('00' + x.toString(16)).slice(-2))
.join('');
}
// 字节流转成可理解的字符串
function uint8ArrayToString(array) {
let arrayString = '';
for (let i = 0; i < array.length; i++) {
arrayString += String.fromCharCode(array[i]);
}
return arrayString;
}
function genKeyMaterialBlob() {
let arr = [
0xba, 0x3d, 0xc2, 0x71, 0x21, 0x1e, 0x30, 0x56,
0xad, 0x47, 0xfc, 0x5a, 0x46, 0x39, 0xee, 0x7c,
0xba, 0x3b, 0xc2, 0x71, 0xab, 0xa0, 0x30, 0x72]; // keyLen = 192 (24 bytes)
let keyMaterial = new Uint8Array(arr);
return {data : keyMaterial};
}
// 3DES ECB模式示例,采用已有数据生成密钥(callback写法)
function test3DesEcb() {
// 生成对称密钥生成器
let symAlgName = '3DES192';
let symKeyGenerator = cryptoFramework.createSymKeyGenerator(symAlgName);
if (symKeyGenerator == null) {
console.error('createSymKeyGenerator failed');
return;
}
console.info(`symKeyGenerator algName: ${symKeyGenerator.algName}`);
// 生成加解密生成器
let cipherAlgName = '3DES192|ECB|PKCS7';
try {
globalCipher = cryptoFramework.createCipher(cipherAlgName);
console.info(`cipher algName: ${globalCipher.algName}`);
} catch (error) {
console.error(`createCipher failed, ${error.code}, ${error.message}`);
return;
}
// 根据指定的数据,生成对称密钥
let keyMaterialBlob = genKeyMaterialBlob();
try {
symKeyGenerator.convertKey(keyMaterialBlob, (error, key) => {
if (error) {
console.error(`convertKey error, ${error.code}, ${error.message}`);
return;
}
console.info(`key algName: ${key.algName}`);
console.info(`key format: ${key.format}`);
let encodedKey = key.getEncoded();
console.info('key getEncoded hex: ' + uint8ArrayToShowStr(encodedKey.data));
globalKey = key;
// 初始化加解密操作环境:开始加密
let mode = cryptoFramework.CryptoMode.ENCRYPT_MODE;
// init
globalCipher.init(mode, key, null, (err, ) => {
let plainText = {data : stringToUint8Array('this is test!')};
// update
globalCipher.update(plainText, (err, updateOutput) => {
globalCipherText = updateOutput;
//doFinal
globalCipher.doFinal(null, (err, finalOutput) => {
if (error) {
console.error(`doFinal error, ${error.code}, ${error.message}`);
return;
}
if (finalOutput != null) {
globalCipherText = Array.from(globalCipherText.data);
finalOutput = Array.from(finalOutput.data);
globalCipherText = globalCipherText.concat(finalOutput);
globalCipherText = new Uint8Array(globalCipherText);
globalCipherText = {data : globalCipherText};
}
// 初始化加解密操作环境:开始解密
let mode = cryptoFramework.CryptoMode.DECRYPT_MODE;
// init
globalCipher.init(mode, globalKey, null, (err, ) => {
// update
globalCipher.update(globalCipherText, (err, updateOutput) => {
console.info('decrypt plainText: ' + uint8ArrayToString(updateOutput.data));
// doFinal
globalCipher.doFinal(null, (error, finalOutput) => {
if (finalOutput != null) { // 使用finalOutput.data前,先判断结果是否为null
console.info("decrypt plainText:" + uint8ArrayToString(finalOutput.data));
}
})
})
})
})
})
})
})
} catch (error) {
console.error(`convertKey failed, ${error.code}, ${error.message}`);
return;
}
}
以AES GCM以promise方式,分段update()实现加解密为例:
import cryptoFramework from '@ohos.security.cryptoFramework';
var globalCipher;
var globalGcmParams;
var globalKey;
var globalCipherText;
var globalPlainText;
function genGcmParamsSpec() {
let arr = [0, 0, 0, 0 , 0, 0, 0, 0, 0, 0 , 0, 0]; // 12 bytes
let dataIv = new Uint8Array(arr);
let ivBlob = {data : dataIv};
arr = [0, 0, 0, 0 , 0, 0, 0, 0]; // 8 bytes
let dataAad = new Uint8Array(arr);
let aadBlob = {data : dataAad};
arr = [0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0]; // 16 bytes
let dataTag = new Uint8Array(arr);
let tagBlob = {data : dataTag};
let gcmParamsSpec = {iv : ivBlob, aad : aadBlob, authTag : tagBlob, algName : "GcmParamsSpec"};
return gcmParamsSpec;
}
// 字节流以16进制输出
function uint8ArrayToShowStr(uint8Array) {
return Array.prototype.map
.call(uint8Array, (x) => ('00' + x.toString(16)).slice(-2))
.join('');
}
// 字节流转成可理解的字符串
function uint8ArrayToString(array) {
let arrayString = '';
for (let i = 0; i < array.length; i++) {
arrayString += String.fromCharCode(array[i]);
}
return arrayString;
}
// 算法库不限定update的次数和每次加解密的数据量,业务可根据自身内存情况对明文/密文进行多次分段。
function testAesMultiUpdate() {
return new Promise((resolve, reject) => {
setTimeout(() => {
resolve('testAesMultiUpdate');
}, 10)
}).then(() => {
// 生成对称密钥生成器
let symAlgName = 'AES128';
let symKeyGenerator = cryptoFramework.createSymKeyGenerator(symAlgName);
if (symKeyGenerator == null) {
console.error('createSymKeyGenerator failed');
return;
}
console.info(`symKeyGenerator algName: ${symKeyGenerator.algName}`);
// 通过密钥生成器随机生成128位长度的对称密钥
let promiseSymKey = symKeyGenerator.generateSymKey();
// 构造参数
globalGcmParams = genGcmParamsSpec();
// 生成加解密生成器
let cipherAlgName = 'AES128|GCM|PKCS7';
try {
globalCipher = cryptoFramework.createCipher(cipherAlgName);
console.info(`cipher algName: ${globalCipher.algName}`);
} catch (error) {
console.error(`createCipher failed, ${error.code}, ${error.message}`);
return;
}
return promiseSymKey;
}).then(key => {
let encodedKey = key.getEncoded();
console.info('key hex:' + uint8ArrayToShowStr(encodedKey.data));
globalKey = key;
return key;
}).then(key => {
// 初始化加解密操作环境:开始加密
let mode = cryptoFramework.CryptoMode.ENCRYPT_MODE;
let promiseInit = globalCipher.init(mode, key, globalGcmParams); // init
return promiseInit;
}).then(async () => {
let plainText = "aaaaa.....bbbbb.....ccccc.....ddddd.....eee"; // 假设明文总共43字节
let messageArr = [];
let updateLength = 20; // 假设每20字节分段update一次
globalCipherText = [];
for (let i = 0; i <= plainText.length; i++) {
if ((i % updateLength == 0 || i == plainText.length) && messageArr.length != 0) {
let message = new Uint8Array(messageArr);
let messageBlob = { data : message };
let updateOutput = await globalCipher.update(messageBlob); // 分段update
// 把update的结果拼接起来,得到密文(有些情况下还需拼接doFinal的结果,这取决于分组模式
// 和填充模式,本例中GCM模式的doFinal结果只包含authTag而不含密文,所以不需要拼接)
globalCipherText = globalCipherText.concat(Array.from(updateOutput.data));
messageArr = [];
}
if (i < plainText.length) {
messageArr.push(plainText.charCodeAt(i));
}
}
return;
}).then(() => {
let promiseFinal = globalCipher.doFinal(null); // doFinal
return promiseFinal;
}).then(authTag => {
// 获取加密后的认证信息
globalGcmParams.authTag = authTag;
return;
}).then(() => {
// 初始化加解密操作环境:开始解密
let mode = cryptoFramework.CryptoMode.DECRYPT_MODE;
let promiseInit = globalCipher.init(mode, globalKey, globalGcmParams); // init
return promiseInit;
}).then(async () => {
let updateLength = 20;
let updateTimes = Math.ceil(globalCipherText.length / updateLength); // 上取整
globalPlainText = "";
for (let i = 0; i < updateTimes; i++) {
let messageArr = globalCipherText.slice(i * updateLength, (i + 1) * updateLength);
let message = new Uint8Array(messageArr);
let messageBlob = { data : message };
let updateOutput = await globalCipher.update(messageBlob); // 分段update
globalPlainText += uint8ArrayToString(updateOutput.data); // 恢复出原始明文
}
return;
}).then(() => {
let promiseFinal = globalCipher.doFinal(null); // doFinal
return promiseFinal;
}).then(finalOutput => {
if (finalOutput == null) {
console.info('GCM finalOutput is null');
}
console.info(`decrypt output: ${globalPlainText}`);
}).catch(error => {
console.error(`catch error, ${error.code}, ${error.message}`);
})
}
示例2:使用非对称密钥的加解密操作
- 生成RSA密钥。通过createAsyKeyGenerator接口创建AsyKeyGenerator对象,并生成RSA非对称密钥。
- 生成Cipher对象。通过createCipher接口创建Cipher对象,执行初始化操作,设置密钥及加解密模式。
- 执行加解密操作。通过调用Cipher对象提供的doFinal接口,执行加密操作生成密文或执行解密操作生成明文。
import cryptoFramework from "@ohos.security.cryptoFramework"
let plan = "This is cipher test.";
function stringToUint8Array(str) {
var arr = [];
for (var i = 0, j = str.length; i < j; ++i) {
arr.push(str.charCodeAt(i));
}
var tmpArray = new Uint8Array(arr);
return tmpArray;
}
function encryptMessageProMise() {
let rsaGenerator = cryptoFramework.createAsyKeyGenerator("RSA1024|PRIMES_2");
let cipher = cryptoFramework.createCipher("RSA1024|PKCS1");
let keyGenPromise = rsaGenerator.generateKeyPair();
keyGenPromise.then(rsaKeyPair => {
let pubKey = rsaKeyPair.pubKey;
return cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, pubKey, null);
}).then(() => {
let input = { data : stringToUint8Array(plan) };
return cipher.doFinal(input);
}).then(dataBlob => {
console.info("EncryptOutPut is " + dataBlob.data);
});
}
function encryptMessageCallback() {
let rsaGenerator = cryptoFramework.createAsyKeyGenerator("RSA1024|PRIMES_2");
let cipher = cryptoFramework.createCipher("RSA1024|PKCS1");
rsaGenerator.generateKeyPair(function (err, keyPair) {
let pubKey = keyPair.pubKey;
cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, pubKey, null, function (err, data) {
let input = {data : stringToUint8Array(plan) };
cipher.doFinal(input, function (err, data) {
console.info("EncryptOutPut is " + data.data);
})
})
})
}
function decryptMessageProMise() {
let rsaGenerator = cryptoFramework.createAsyKeyGenerator("RSA1024|PRIMES_2");
let cipher = cryptoFramework.createCipher("RSA1024|PKCS1");
let decoder = cryptoFramework.createCipher("RSA1024|PKCS1");
let keyGenPromise = rsaGenerator.generateKeyPair();
let keyPair;
let cipherDataBlob;
let input = { data : stringToUint8Array(plan) };
keyGenPromise.then(rsaKeyPair => {
keyPair = rsaKeyPair;
return cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, keyPair.pubKey, null);
}).then(() => {
return cipher.doFinal(input);
}).then(dataBlob => {
console.info("EncryptOutPut is " + dataBlob.data);
AlertDialog.show({message : "output" + dataBlob.data});
cipherDataBlob = dataBlob;
return decoder.init(cryptoFramework.CryptoMode.DECRYPT_MODE, keyPair.priKey, null);
}).then(() => {
return decoder.doFinal(cipherDataBlob);
}).then(decodeData => {
if (decodeData.data.toString() === input.data.toString()) {
AlertDialog.show({message : "decrypt success"});
return;
}
AlertDialog.show({message : "decrypt fail"});
});
}
function decryptMessageCallback() {
let rsaGenerator = cryptoFramework.createAsyKeyGenerator("RSA1024|PRIMES_2");
let cipher = cryptoFramework.createCipher("RSA1024|PKCS1");
let decoder = cryptoFramework.createCipher("RSA1024|PKCS1");
let plainText = "this is cipher text";
let input = {data : stringToUint8Array(plainText) };
let cipherData;
let keyPair;
rsaGenerator.generateKeyPair(function (err, newKeyPair) {
keyPair = newKeyPair;
cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, keyPair.pubKey, null, function (err, data) {
cipher.doFinal(input, function (err, data) {
AlertDialog.show({ message : "EncryptOutPut is " + data.data} );
cipherData = data;
decoder.init(cryptoFramework.CryptoMode.DECRYPT_MODE, keyPair.priKey, null, function (err, data) {
decoder.doFinal(cipherData, function (err, data) {
if (input.data.toString() === data.data.toString()) {
AlertDialog.show({ message : "decrype success"} );
return;
}
AlertDialog.show({ message : "decrype fail"} );
});
});
});
});
});
}
以RSA非对称加解密(多次调用doFinal实现分段)为例:
import cryptoFramework from "@ohos.security.cryptoFramework"
function stringToUint8Array(str) {
var arr = [];
for (var i = 0, j = str.length; i < j; ++i) {
arr.push(str.charCodeAt(i));
}
var tmpArray = new Uint8Array(arr);
return tmpArray;
}
// 字节流转成可理解的字符串
function uint8ArrayToString(array) {
let arrayString = '';
for (let i = 0; i < array.length; i++) {
arrayString += String.fromCharCode(array[i]);
}
return arrayString;
}
function encryptLongMessagePromise() {
let globalPlainText = "This is a long plainTest! This is a long plainTest! This is a long plainTest!" +
"This is a long plainTest! This is a long plainTest! This is a long plainTest! This is a long plainTest!" +
"This is a long plainTest! This is a long plainTest! This is a long plainTest! This is a long plainTest!" +
"This is a long plainTest! This is a long plainTest! This is a long plainTest! This is a long plainTest!" +
"This is a long plainTest! This is a long plainTest! This is a long plainTest! This is a long plainTest!" +
"This is a long plainTest! This is a long plainTest! This is a long plainTest! This is a long plainTest!" +
"This is a long plainTest! This is a long plainTest! This is a long plainTest! This is a long plainTest!" +
"This is a long plainTest! This is a long plainTest! This is a long plainTest! This is a long plainTest!";
let globalCipherOutput;
let globalDecodeOutput;
var globalKeyPair;
let plainTextSplitLen = 64; // RSA每次加解密允许的原文长度大小与密钥位数和填充模式等有关,详细规格内容见overview文档
let cipherTextSplitLen = 128; // RSA密钥每次加密生成的密文数据长度计算方式:密钥位数/8
let keyGenName = "RSA1024";
let cipherAlgName = "RSA1024|PKCS1";
let asyKeyGenerator = cryptoFramework.createAsyKeyGenerator(keyGenName); // 创建非对称密钥生成器对象
let cipher = cryptoFramework.createCipher(cipherAlgName); // 创建加密Cipher对象
let decoder = cryptoFramework.createCipher(cipherAlgName); // 创建解密Decoder对象
return new Promise((resolve, reject) => {
setTimeout(() => {
resolve("testRsaMultiDoFinal");
}, 10);
}).then(() => {
return asyKeyGenerator.generateKeyPair(); // 生成rsa密钥
}).then(keyPair => {
globalKeyPair = keyPair; // 保存到密钥对全局变量
return cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, globalKeyPair.pubKey, null);
}).then(async () => {
globalCipherOutput = [];
// 将原文按64字符进行拆分,循环调用doFinal进行加密,使用1024bit密钥时,每次加密生成128B长度的密文
for (let i = 0; i < (globalPlainText.length / plainTextSplitLen); i++) {
let tempStr = globalPlainText.substr(i * plainTextSplitLen, plainTextSplitLen);
let tempBlob = { data : stringToUint8Array(tempStr) };
let tempCipherOutput = await cipher.doFinal(tempBlob);
globalCipherOutput = globalCipherOutput.concat(Array.from(tempCipherOutput.data));
}
console.info(`globalCipherOutput len is ${globalCipherOutput.length}, data is: ${globalCipherOutput.toString()}`);
return;
}).then(() =>{
return decoder.init(cryptoFramework.CryptoMode.DECRYPT_MODE, globalKeyPair.priKey, null);
}).then(async() => {
globalDecodeOutput = [];
// 将密文按128B进行拆分解密,得到原文后进行拼接
for (let i = 0; i < (globalCipherOutput.length / cipherTextSplitLen); i++) {
let tempBlobData = globalCipherOutput.slice(i * cipherTextSplitLen, (i + 1) * cipherTextSplitLen);
let message = new Uint8Array(tempBlobData);
let tempBlob = { data : message };
let tempDecodeOutput = await decoder.doFinal(tempBlob);
globalDecodeOutput += uint8ArrayToString(tempDecodeOutput.data);
}
if (globalDecodeOutput === globalPlainText) {
console.info(`encode and decode success`);
} else {
console.info(`encode and decode error`);
}
return;
}).catch(error => {
console.error(`catch error, ${error.code}, ${error.message}`);
})
}
说明
- 使用RSA加解密时,Cipher对象不可重复调用init方法初始化,在创建了一个加密Cipher对象后,如果要进行解密,则需要重新创建另一个Cipher对象执行解密操作。
- RSA加密有长度限制,允许加密明文的最大长度见加解密算法库框架概述中的基本概念章节。
- RSA解密每次允许解密的密文长度为,RSA密钥的位数/8。
使用签名验签操作
场景说明
当需要判断接收的数据是否被篡改且是否为指定对象发送的数据时,可以使用签名验签操作。使用签名验签操作中,典型的场景有:
- 使用RSA签名验签操作
- 使用ECC签名验签操作
接口及参数说明
详细接口说明可参考API参考。
由于密码算法的复杂性,在选取不同规格和参数时,开发差异较大,无法通过代码示例一一列举,请仔细阅读API参考资料中的相关接口,确保使用正确。
实例名 | 接口名 | 描述 |
---|---|---|
cryptoFramework | createSign(algName : string) : Sign | 根据String设置的参数创建Sign对象 |
Sign | init(priKey : PriKey, callback : AsyncCallback<void>) : void | 使用callback方式设置密钥并初始化Sign对象 |
Sign | init(priKey : PriKey) : Promise<void> | 使用Promise方式设置密钥并初始化Sign对象 |
Sign | update(data : DataBlob, callback : AsyncCallback<void>) : void | 使用callback方式添加签名数据 |
Sign | update(data : DataBlob) : Promise<void> | 用Promise方式添加签名数据 |
Sign | sign(data : DataBlob, callback : AsyncCallback<DataBlob>) : void | 使用callback方式签名所有数据 |
Sign | sign(data : DataBlob) : Promise<DataBlob> | 使用Promise方式签名所有数据 |
cryptoFramework | function createVerify(algName : string) : Verify | 根据String设置的参数创建Verify对象 |
Verify | init(priKey : PriKey, callback : AsyncCallback<void>) : void | 使用callback方式设置密钥并初始化Verify对象 |
Verify | init(priKey : PriKey) : Promise<void> | 使用Promise方式设置密钥并初始化Verify对象 |
Verify | update(data : DataBlob, callback : AsyncCallback<void>) : void | 使用callback方式添加验签数据 |
Verify | update(data : DataBlob) : Promise<void> | 用Promise方式添加验签数据 |
Verify | verify(data : DataBlob, signatureData : DataBlob, callback : AsyncCallback<boolean>) : void | 使用callback方式验签所有数据 |
Verify | verify(data : DataBlob, signatureData : DataBlob) : Promise<boolean> | 使用Promise方式验签所有数据 |
开发步骤
示例1:使用RSA签名验签操作
- 生成RSA密钥。通过createAsyKeyGenerator接口创建AsyKeyGenerator对象,并生成RSA非对称密钥。
- 生成Sign对象。通过createSign接口创建Sign对象,执行初始化操作并设置签名私钥。
- 执行签名操作。通过Sign类提供的update接口,添加签名数据,并调用sign接口生成数据的签名。
- 生成Verify对象。通过createVerify接口创建Verify对象,执行初始化操作并设置验签公钥。
- 执行验签操作。通过Verify类提供的update接口,添加签名数据,并调用verify接口传入签名进行验签。
import cryptoFramework from "@ohos.security.cryptoFramework"
function stringToUint8Array(str) {
var arr = [];
for (var i = 0, j = str.length; i < j; ++i) {
arr.push(str.charCodeAt(i));
}
var tmpArray = new Uint8Array(arr);
return tmpArray;
}
let globalKeyPair;
let SignMessageBlob;
let plan1 = "This is Sign test plan1";
let plan2 = "This is Sign test plan1";
let input1 = { data : stringToUint8Array(plan1) };
let input2 = { data : stringToUint8Array(plan2) };
function signMessagePromise() {
let rsaGenerator = cryptoFramework.createAsyKeyGenerator("RSA1024|PRIMES_2");
let signer = cryptoFramework.createSign("RSA1024|PKCS1|SHA256");
let keyGenPromise = rsaGenerator.generateKeyPair();
keyGenPromise.then( keyPair => {
globalKeyPair = keyPair;
let priKey = globalKeyPair.priKey;
return signer.init(priKey);
}).then(() => {
return signer.update(input1);
}).then(() => {
return signer.sign(input2);
}).then(dataBlob => {
SignMessageBlob = dataBlob;
console.info("sign output is " + SignMessageBlob.data);
});
}
function verifyMessagePromise() {
let verifyer = cryptoFramework.createVerify("RSA1024|PKCS1|SHA256");
let verifyInitPromise = verifyer.init(globalKeyPair.pubKey);
verifyInitPromise.then(() => {
return verifyer.update(input1);
}).then(() => {
return verifyer.verify(input2, SignMessageBlob);
}).then(res => {
console.log("Verify result is " + res);
});
}
function signMessageCallback() {
let rsaGenerator = cryptoFramework.createAsyKeyGenerator("RSA1024|PRIMES_2");
let signer = cryptoFramework.createSign("RSA1024|PKCS1|SHA256");
rsaGenerator.generateKeyPair(function (err, keyPair) {
globalKeyPair = keyPair;
let priKey = globalKeyPair.priKey;
signer.init(priKey, function (err, data) {
signer.update(input1, function (err, data) {
signer.sign(input2, function (err, data) {
SignMessageBlob = data;
console.info("sign output is " + SignMessageBlob.data);
});
});
});
});
}
function verifyMessageCallback() {
let verifyer = cryptoFramework.createVerify("RSA1024|PKCS1|SHA256");
verifyer.init(globalKeyPair.pubKey, function (err, data) {
verifyer.update(input1, function(err, data) {
verifyer.verify(input2, SignMessageBlob, function(err, data) {
console.info("verify result is " + data);
});
});
})
}
示例2:使用ECDSA操作
- 生成ECC密钥。通过createAsyKeyGenerator接口创建AsyKeyGenerator对象,并生成ECC非对称密钥。
- 生成Sign对象。通过createSign接口创建Sign对象,执行初始化操作并设置签名私钥。
- 执行签名操作。通过Sign类提供的update接口,添加签名数据,并调用doFinal接口生成数据的签名。
- 生成Verify对象。通过createVerify接口创建Verify对象,执行初始化操作并设置验签公钥。
- 执行验签操作。通过Verify类提供的update接口,添加签名数据,并调用doFinal接口传入签名进行验签。
import cryptoFramework from "@ohos.security.cryptoFramework"
function stringToUint8Array(str) {
var arr = [];
for (var i = 0, j = str.length; i < j; ++i) {
arr.push(str.charCodeAt(i));
}
var tmpArray = new Uint8Array(arr);
return tmpArray;
}
let globalKeyPair;
let SignMessageBlob;
let plan1 = "This is Sign test plan1";
let plan2 = "This is Sign test plan1";
let input1 = { data : stringToUint8Array(plan1) };
let input2 = { data : stringToUint8Array(plan2) };
function signMessagePromise() {
let eccGenerator = cryptoFramework.createAsyKeyGenerator("ECC256");
let signer = cryptoFramework.createSign("ECC256|SHA256");
let keyGenPromise = eccGenerator.generateKeyPair();
keyGenPromise.then( keyPair => {
globalKeyPair = keyPair;
let priKey = globalKeyPair.priKey;
return signer.init(priKey);
}).then(() => {
return signer.update(input1);
}).then(() => {
return signer.sign(input2);
}).then(dataBlob => {
SignMessageBlob = dataBlob;
console.info("sign output is " + SignMessageBlob.data);
});
}
function verifyMessagePromise() {
let verifyer = cryptoFramework.createVerify("ECC256|SHA256");
let verifyInitPromise = verifyer.init(globalKeyPair.pubKey);
verifyInitPromise.then(() => {
return verifyer.update(input1);
}).then(() => {
return verifyer.verify(input2, SignMessageBlob);
}).then(res => {
console.log("Verify result is " + res);
});
}
function signMessageCallback() {
let eccGenerator = cryptoFramework.createAsyKeyGenerator("ECC256");
let signer = cryptoFramework.createSign("ECC256|SHA256");
eccGenerator.generateKeyPair(function (err, keyPair) {
globalKeyPair = keyPair;
let priKey = globalKeyPair.priKey;
signer.init(priKey, function (err, data) {
signer.update(input1, function (err, data) {
signer.sign(input2, function (err, data) {
SignMessageBlob = data;
console.info("sign output is " + SignMessageBlob.data);
});
});
});
});
}
function verifyMessageCallback() {
let verifyer = cryptoFramework.createVerify("ECC256|SHA256");
verifyer.init(globalKeyPair.pubKey, function (err, data) {
verifyer.update(input1, function(err, data) {
verifyer.verify(input2, SignMessageBlob, function(err, data) {
console.info("verify result is " + data);
});
});
})
}
以执行签名、验签操作时多次调用update实现分段为例:
import cryptoFramework from "@ohos.security.cryptoFramework"
function stringToUint8Array(str) {
var arr = [];
for (var i = 0, j = str.length; i < j; ++i) {
arr.push(str.charCodeAt(i));
}
var tmpArray = new Uint8Array(arr);
return tmpArray;
}
function signLongMessagePromise() {
let globalPlainText = "This is a long plainTest! This is a long plainTest! This is a long plainTest!" +
"This is a long plainTest! This is a long plainTest! This is a long plainTest! This is a long plainTest!" +
"This is a long plainTest! This is a long plainTest! This is a long plainTest! This is a long plainTest!" +
"This is a long plainTest! This is a long plainTest! This is a long plainTest! This is a long plainTest!" +
"This is a long plainTest! This is a long plainTest! This is a long plainTest! This is a long plainTest!" +
"This is a long plainTest! This is a long plainTest! This is a long plainTest! This is a long plainTest!" +
"This is a long plainTest! This is a long plainTest! This is a long plainTest! This is a long plainTest!" +
"This is a long plainTest! This is a long plainTest! This is a long plainTest! This is a long plainTest!";
let globalSignData;
let textSplitLen = 64; // 自定义的数据拆分长度
let keyGenName = "RSA1024";
let cipherAlgName = "RSA1024|PKCS1|SHA256";
let globalKeyPair;
let asyKeyGenerator = cryptoFramework.createAsyKeyGenerator(keyGenName); // 创建非对称密钥生成器对象
let signer = cryptoFramework.createSign(cipherAlgName); // 创建加密Cipher对象
let verifier = cryptoFramework.createVerify(cipherAlgName); // 创建解密Decoder对象
return new Promise((resolve, reject) => {
setTimeout(() => {
resolve("testRsaMultiUpdate");
}, 10);
}).then(() => {
return asyKeyGenerator.generateKeyPair(); // 生成rsa密钥
}).then(keyPair => {
globalKeyPair = keyPair; // 保存到密钥对全局变量
return signer.init(globalKeyPair.priKey);
}).then(async () => {
// 当原文过大时,可将原文按理想长度进行拆分,循环调用update添加原文
for (let i = 0; i < (globalPlainText.length / textSplitLen); i++) {
let tempStr = globalPlainText.substr(i * textSplitLen, textSplitLen);
let tempBlob = { data : stringToUint8Array(tempStr) };
await signer.update(tempBlob);
}
return signer.sign(null);
}).then(data =>{
globalSignData = data.data;
console.info(`globalSignOutput len is ${globalSignData.length}, data is: ${globalSignData.toString()}`);
return verifier.init(globalKeyPair.pubKey);
}).then(async() => {
// 将密文按128B进行拆分解密,得到原文后进行拼接
for (let i = 0; i < (globalPlainText.length / textSplitLen); i++) {
let tempData = globalPlainText.slice(i * textSplitLen, (i + 1) * textSplitLen);
let tempBlob = { data : stringToUint8Array(tempData) };
await verifier.update(tempBlob);
}
return verifier.verify(null, { data : globalSignData});
}).then(res => {
console.info(`verify res is ${res}`);
}).catch(error => {
console.error(`catch error, ${error.code}, ${error.message}`);
})
}
使用摘要操作
场景说明
用户指定摘要算法(如SHA256)生成Md实例,并输入单段或多段需要摘要的信息,进行摘要计算更新,并返回消息摘要计算结果,在指定算法后可获取当前算法名与摘要计算长度(字节)
使用摘要操作的主要场景为:
用户指定摘要算法(如SHA256)生成Md实例,并输入单段或多段需要摘要的信息,进行摘要计算更新,并返回消息摘要计算结果,在指定算法后可获取当前算法名与摘要计算长度(字节)
接口及参数说明
详细接口说明可参考API参考。
实例名 | 接口名 | 描述 |
---|---|---|
cryptoFramework | function createMd(algName : string) : Md; | 指定摘要算法,生成摘要操作实例Md |
Md | update(input : DataBlob, callback : AsyncCallback<void>) : void; | 接受用户输入数据,通过Callback的方式,异步更新摘要 |
Md | update(input : DataBlob) : Promise<void>; | 接受用户输入数据,通过Promise的方式,异步更新摘要 |
Md | digest(callback : AsyncCallback<DataBlob>) : void; | 通过Callback的方式,返回结果 |
Md | digest() : Promise<DataBlob>; | 通过Promise的方式,返回结果 |
Md | getMdLength() : number; | 获取摘要的长度(由指定的摘要算法决定) |
Md | readonly algName : string; | 获取当前设置的摘要算法名 |
开发步骤
- 设置算法,通过接口
createMd
生成摘要操作实例 - 接受用户数据,通过接口
update
,更新摘要,此步骤可重复 - 通过接口
digest
,返回摘要计算结果 - 获取当前摘要算法名与摘要计算长度
import cryptoFramework from "@ohos.security.cryptoFramework"
// turn string into uint8Arr
function stringToUint8Array(str) {
var arr = [];
for (var i = 0, j = str.length; i < j; ++i) {
arr.push(str.charCodeAt(i));
}
var tmpUint8Array = new Uint8Array(arr);
return tmpUint8Array;
}
// generate dataBlob with given length
function GenDataBlob(dataBlobLen) {
var dataBlob;
if (dataBlobLen == 12) {
dataBlob = {data: stringToUint8Array("my test data")};
} else {
console.error("GenDataBlob: dataBlobLen is invalid");
dataBlob = {data: stringToUint8Array("my test data")};
}
return dataBlob;
}
// md with promise async
function doMdByPromise(algName) {
var md;
try {
md = cryptoFramework.createMd(algName);
} catch (error) {
console.error("[Promise]: error code: " + error.code + ", message is: " + error.message);
}
console.error("[Promise]: Md algName is: " + md.algName);
// 初次update
var promiseMdUpdate = md.update(GenDataBlob(12));
promiseMdUpdate.then(() => {
// 可根据情况进行多次update
promiseMdUpdate = md.update(GenDataBlob(12));
return promiseMdUpdate;
}).then(mdOutput => {
var PromiseMdDigest = md.digest();
return PromiseMdDigest;
}).then(mdOutput => {
console.error("[Promise]: MD result: " + mdOutput.data);
var mdLen = md.getMdLength();
console.error("[Promise]: MD len: " + mdLen);
}).catch(error => {
console.error("[Promise]: error: " + error.message);
});
}
// md with callback async
function doMdByCallback(algName) {
var md;
try {
md = cryptoFramework.createMd(algName);
} catch (error) {
console.error("[Callback]: error code: " + error.code + ", message is: " + error.message);
}
console.error("[Callback]: Md algName is: " + md.algName);
// 初次update
md.update(GenDataBlob(12), (err,) => {
if (err) {
console.error("[Callback]: err: " + err.code);
}
// 可根据情况进行多次update
md.update(GenDataBlob(12), (err1,) => {
if (err1) {
console.error("[Callback]: err: " + err1.code);
}
md.digest((err2, mdOutput) => {
if (err2) {
console.error("[Callback]: err: " + err2.code);
} else {
console.error("[Callback]: MD result: " + mdOutput.data);
var mdLen = md.getMdLength();
console.error("[Callback]: MD len: " + mdLen);
}
});
});
});
}
以MD更新时多次调用update实现分段为例:
import cryptoFramework from "@ohos.security.cryptoFramework"
async function updateData(index, obj, data) {
console.error("update " + (index + 1) + " MB data...");
return obj.update(data);
}
function stringToUint8Array(str) {
var arr = [];
for (var i = 0, j = str.length; i < j; ++i) {
arr.push(str.charCodeAt(i));
}
var tmpUint8Array = new Uint8Array(arr);
return tmpUint8Array;
}
function GenDataBlob(dataBlobLen) {
var dataBlob;
if (dataBlobLen == 12) {
dataBlob = {data: stringToUint8Array("my test data")};
} else {
console.error("GenDataBlob: dataBlobLen is invalid");
dataBlob = {data: stringToUint8Array("my test data")};
}
return dataBlob;
}
function LoopMdPromise(algName, loopSize) {
var md;
try {
md = cryptoFramework.createMd(algName);
} catch (error) {
console.error("[Promise]: error code: " + error.code + ", message is: " + error.message);
return;
}
console.error("[Promise]: Md algName is: " + md.algName);
var promiseMdUpdate = md.update(GenDataBlob(12));
promiseMdUpdate.then(() => {
var PromiseMdDigest = md.digest();
return PromiseMdDigest;
}).then(async () => {
for (var i = 0; i < loopSize; i++) {
await updateData(i, md, GenDataBlob(12));
}
var PromiseMdDigest = md.digest();
return PromiseMdDigest;
}).then(mdOutput => {
console.error("[Promise]: MD result: " + mdOutput.data);
var mdLen = md.getMdLength();
console.error("[Promise]: MD len: " + mdLen);
}).catch(error => {
console.error("[Promise]: error: " + error.message);
});
}
使用密钥协商操作
场景说明
使用密钥协商操作中,典型的场景有:
通信双方可以在一个公开的信道上通过相互传送一些消息,共同建立一个安全的共享秘密密钥。
接口及参数说明
详细接口说明可参考API参考。
实例名 | 接口名 | 描述 |
---|---|---|
cryptoFramework | createKeyAgreement(algName : string) : KeyAgreement | 根据String设置的参数创建KeyAgreement对象 |
KeyAgreement | generateSecret(priKey : PriKey, pubKey : PubKey, callback : AsyncCallback<DataBlob>) : void | 使用callback方式进行密钥协商 |
KeyAgreement | generateSecret(priKey : PriKey, pubKey : PubKey) : Promise<DataBlob> | 使用Promise方式进行密钥协商 |
开发步骤
- 通过createKeyAgreement接口创建KeyAgreement对象,用于后续的密钥协商操作。
- 调用KeyAgreement对象提供的generateSecret方法,传入对端的ECC公钥对象,以及本地生成的ECC私钥对象。
import cryptoFramework from "@ohos.security.cryptoFramework"
let globalSelfPriKey;
let globalPeerPubKey;
function ecdhPromise() {
let peerPubKeyArray = new Uint8Array([48,89,48,19,6,7,42,134,72,206,61,2,1,6,8,42,134,72,206,61,3,1,7,3,66,0,4,83,96,142,9,86,214,126,106,247,233,92,125,4,128,138,105,246,162,215,71,81,58,202,121,26,105,211,55,130,45,236,143,55,16,248,75,167,160,167,106,2,152,243,44,68,66,0,167,99,92,235,215,159,239,28,106,124,171,34,145,124,174,57,92]);
let peerPubKeyBlob = { data: peerPubKeyArray };
let eccGenerator = cryptoFramework.createAsyKeyGenerator("ECC256");
let eccKeyAgreement = cryptoFramework.createKeyAgreement("ECC256");
eccGenerator.convertKey(peerPubKeyBlob, null).then((peerKeyPair) => {
globalPeerPubKey = peerKeyPair.pubKey;
return eccGenerator.generateKeyPair();
}).then((keyPair) => {
globalSelfPriKey = keyPair.priKey;
return eccKeyAgreement.generateSecret(globalSelfPriKey, globalPeerPubKey);
}).then((secret) => {
console.info("ecdh promise output is " + secret.data);
}).catch((error) => {
console.error("ecdh error.");
});
}
function ecdhCallback() {
let peerPubKeyArray = new Uint8Array([48,89,48,19,6,7,42,134,72,206,61,2,1,6,8,42,134,72,206,61,3,1,7,3,66,0,4,83,96,142,9,86,214,126,106,247,233,92,125,4,128,138,105,246,162,215,71,81,58,202,121,26,105,211,55,130,45,236,143,55,16,248,75,167,160,167,106,2,152,243,44,68,66,0,167,99,92,235,215,159,239,28,106,124,171,34,145,124,174,57,92]);
let peerPubKeyBlob = { data: peerPubKeyArray };
let eccGenerator = cryptoFramework.createAsyKeyGenerator("ECC256");
let eccKeyAgreement = cryptoFramework.createKeyAgreement("ECC256");
eccGenerator.convertKey(peerPubKeyBlob, null, function (err, peerKeyPair) {
globalPeerPubKey = peerKeyPair.pubKey;
eccGenerator.generateKeyPair(function (err, keyPair) {
globalSelfPriKey = keyPair.priKey;
eccKeyAgreement.generateSecret(globalSelfPriKey, globalPeerPubKey, function (err, secret) {
if (err) {
console.error("ecdh error.");
return;
}
console.info("ecdh callback output is " + secret.data);
});
});
})
}
使用消息认证码操作
场景说明
消息认证码操作主要应用于身份认证的场景:
Mac(message authentication code)可以对消息进行完整性校验,通过使用双方共享的密钥,识别出信息伪装篡改等行为
用户指定摘要算法(如SHA256)生成消息认证码Mac实例,输入对称密钥初始化Mac,并传入单段或多段需要摘要的信息,进行消息认证码计算,并获取消息认证码计算结果,在指定算法后可获取当前算法名与消息认证码计算长度(字节)。
接口及参数说明
详细接口说明可参考API参考。
实例名 | 接口名 | 描述 |
---|---|---|
cryptoFramework | function createMac(algName : string) : Mac; | 指定摘要算法,生成消息认证码实例Mac |
Mac | init(key : SymKey, callback : AsyncCallback<void>) : void; | 接收输入对称密钥,通过Callback的方式,异步初始化MAC |
Mac | init(key : SymKey) : Promise<void>; | 接收输入对称密钥,通过Promise的方式,异步初始化MAC |
Mac | update(input : DataBlob, callback : AsyncCallback<void>) : void; | 接受输入数据,通过Callback的方式,异步更新MAC |
Mac | update(input : DataBlob) : Promise<void>; | 接受输入数据,通过Promise的方式,异步更新MAC |
Mac | doFinal(callback : AsyncCallback<DataBlob>) : void; | 通过Callback的方式,返回MAC计算结果 |
Mac | doFinal() : Promise<DataBlob>; | 通过Promise的方式,返回MAC计算结果 |
Mac | getMacLength() : number; | 获取MAC的长度(由指定的摘要算法决定) |
Mac | readonly algName : string; | 获取当前设置的摘要算法名 |
开发步骤
- 设置算法,通过接口
createMac
生成消息认证码操作实例 - 接受输入对称密钥,通过接口
init
,初始化Mac - 接受数据,通过接口
update
,更新Mac,此步骤可重复 - 通过接口
doFinal
,返回Mac计算结果 - 获取当前摘要算法名与Mac计算长度
import cryptoFramework from "@ohos.security.cryptoFramework"
// turn string into uint8Arr
function stringToUint8Array(str) {
var arr = [];
for (var i = 0, j = str.length; i < j; ++i) {
arr.push(str.charCodeAt(i));
}
var tmpUint8Array = new Uint8Array(arr);
return tmpUint8Array;
}
// generate blob with this func
function GenDataBlob(dataBlobLen) {
var dataBlob;
if (dataBlobLen == 12) {
dataBlob = {data: stringToUint8Array("my test data")};
} else {
console.error("GenDataBlob: dataBlobLen is invalid");
dataBlob = {data: stringToUint8Array("my test data")};
}
return dataBlob;
}
function doHmacByPromise(algName) {
var mac;
try {
mac = cryptoFramework.createMac(algName);
} catch (error) {
console.error("[Promise]: error code: " + error.code + ", message is: " + error.message);
}
console.error("[Promise]: Mac algName is: " + mac.algName);
var KeyBlob = {
data : stringToUint8Array("12345678abcdefgh")
}
var symKeyGenerator = cryptoFramework.createSymKeyGenerator("AES128");
var promiseConvertKey = symKeyGenerator.convertKey(KeyBlob);
promiseConvertKey.then(symKey => {
var promiseMacInit = mac.init(symKey);
return promiseMacInit;
}).then(() => {
// 初次update
var promiseMacUpdate = mac.update(GenDataBlob(12));
return promiseMacUpdate;
}).then(() => {
// 可根据情况进行多次update
var promiseMacUpdate = mac.update(GenDataBlob(12));
return promiseMacUpdate;
}).then(() => {
var PromiseMacDoFinal = mac.doFinal();
return PromiseMacDoFinal;
}).then(macOutput => {
console.error("[Promise]: HMAC result: " + macOutput.data);
var macLen = mac.getMacLength();
console.error("[Promise]: MAC len: " + macLen);
}).catch(error => {
console.error("[Promise]: error: " + error.message);
});
}
// process by callback
function doHmacByCallback(algName) {
var mac;
try {
mac = cryptoFramework.createMac(algName);
} catch (error) {
AlertDialog.show({message: "[Callback]: error code: " + error.code + ", message is: " + error.message});
console.error("[Callback]: error code: " + error.code + ", message is: " + error.message);
}
var KeyBlob = {
data : stringToUint8Array("12345678abcdefgh")
}
var symKeyGenerator = cryptoFramework.createSymKeyGenerator("AES128");
symKeyGenerator.convertKey(KeyBlob, (err, symKey) => {
if (err) {
console.error("[Callback]: err: " + err.code);
}
mac.init(symKey, (err1, ) => {
if (err1) {
console.error("[Callback]: err: " + err1.code);
}
// 初次update
mac.update(GenDataBlob(12), (err2, ) => {
if (err2) {
console.error("[Callback]: err: " + err2.code);
}
// 可根据情况进行多次update
mac.update(GenDataBlob(12), (err3, ) => {
if (err3) {
console.error("[Callback]: err: " + err3.code);
}
mac.doFinal((err4, macOutput) => {
if (err4) {
console.error("[Callback]: err: " + err4.code);
} else {
console.error("[Callback]: HMAC result: " + macOutput.data);
var macLen = mac.getMacLength();
console.error("[Callback]: MAC len: " + macLen);
}
});
});
});
});
});
}
以HMAC更新MAC时多次调用update实现分段为例:
import cryptoFramework from "@ohos.security.cryptoFramework"
async function updateData(index, obj, data) {
console.error("update " + (index + 1) + " MB data...");
return obj.update(data);
}
function stringToUint8Array(str) {
var arr = [];
for (var i = 0, j = str.length; i < j; ++i) {
arr.push(str.charCodeAt(i));
}
var tmpUint8Array = new Uint8Array(arr);
return tmpUint8Array;
}
function GenDataBlob(dataBlobLen) {
var dataBlob;
if (dataBlobLen == 12) {
dataBlob = {data: stringToUint8Array("my test data")};
} else {
console.error("GenDataBlob: dataBlobLen is invalid");
dataBlob = {data: stringToUint8Array("my test data")};
}
return dataBlob;
}
function LoopHmacPromise(algName, loopSize) {
var mac;
try {
mac = cryptoFramework.createMac(algName);
} catch (error) {
console.error("[Promise]: error code: " + error.code + ", message is: " + error.message);
return;
}
console.error("[Promise]: Mac algName is: " + mac.algName);
var KeyBlob = {
data : stringToUint8Array("12345678abcdefgh")
}
var symKeyGenerator = cryptoFramework.createSymKeyGenerator("AES128");
var promiseConvertKey = symKeyGenerator.convertKey(KeyBlob);
promiseConvertKey.then(symKey => {
var promiseMacInit = mac.init(symKey);
return promiseMacInit;
}).then(async () => {
for (var i = 0; i < loopSize; i++) {
await updateData(i, mac, GenDataBlob(12));
}
var promiseMacUpdate = mac.update(GenDataBlob(12));
return promiseMacUpdate;
}).then(() => {
var PromiseMacDoFinal = mac.doFinal();
return PromiseMacDoFinal;
}).then(macOutput => {
console.error("[Promise]: HMAC result: " + macOutput.data);
var macLen = mac.getMacLength();
console.error("[Promise]: MAC len: " + macLen);
}).catch(error => {
console.error("[Promise]: error: " + error.message);
});
}
使用随机数操作
场景说明
使用随机数操作的主要场景为:
- 用户生成随机数Random实例,输入随机数生成的长度(字节),生成指定长度的随机数。
- 用户使用生成的随机数作为参数,进行种子设置。
接口及参数说明
详细接口说明可参考API参考。
实例名 | 接口名 | 描述 |
---|---|---|
cryptoFramework | function createRandom() : Random; | 生成随机数Random实例 |
Random | generateRandom(len : number, callback: AsyncCallback<DataBlob>) : void; | 接受输入长度,通过Callback,异步生成随机数 |
Random | generateRandom(len : number) : Promise<DataBlob>; | 接受输入长度,通过Promise,异步生成随机数 |
Random | setSeed(seed : DataBlob) : void; | 接受输入Blob,设置种子 |
开发步骤
- 通过接口
createRandom
生成随机数操作实例 - 接受输入长度,通过接口
generateRandom
,生成指定长度的随机数 - 接受DataBlob数据,通过接口
setSeed
,为随机数生成池设置种子
import cryptoFramework from "@ohos.security.cryptoFramework"
// process by promise
function doRandByPromise(len) {
var rand;
try {
rand = cryptoFramework.createRandom();
} catch (error) {
console.error("[Promise]: error code: " + error.code + ", message is: " + error.message);
}
var promiseGenerateRand = rand.generateRandom(len);
promiseGenerateRand.then(randData => {
console.error("[Promise]: rand result: " + randData.data);
try {
rand.setSeed(randData);
} catch (error) {
console.log("setSeed failed, errCode: " + error.code + ", errMsg: " + error.message);
}
}).catch(error => {
console.error("[Promise]: error: " + error.message);
});
}
// process by callback
function doRandByCallback(len) {
var rand;
try {
rand = cryptoFramework.createRandom();
} catch (error) {
console.error("[Callback]: error code: " + error.code + ", message is: " + error.message);
}
rand.generateRandom(len, (err, randData) => {
if (err) {
console.error("[Callback]: err: " + err.code);
} else {
console.error("[Callback]: generate random result: " + randData.data);
try {
rand.setSeed(randData);
} catch (error) {
console.log("setSeed failed, errCode: " + error.code + ", errMsg: " + error.message);
}
}
});
}