HarmonyOS 鸿蒙Next使用国密SM2_256，密钥转成Uint8Array后，convertKey报错

【关键字】

国密 / SM2_256 / 加解密 / Uint8Array / convertKey

【问题描述】

按照官方的SM2_256加解密代码进行配置，从Android项目拷贝密钥，并将密钥转成Uint8Array后，convertKey报错，错误信息如下：

ConvertEcPubKey: d2iECPUBKEY fail.
com.examp…lication E HcfPrintOpensslError: [Openssl]: engine fail, error code = 109052059, error string = error:0680009B:asn1 encoding routines::too long
com.examp…lication E ConvertKeyAsyncWorkProcess: convert key fail.<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>

问题代码如下：

let generator = cryptoFramework.createAsyKeyGenerator("");
generator.convertKey(pubKeyBlob, null, (error, data) => {
})<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>

【解决方案】

请参考如下代码进行配置：

function HexStrTouint8Array(data: string): Uint8Array {
return new Uint8Array(buffer.from(data, ‘hex’).buffer);;
}<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>

async init(): Promise<cryptoFramework.KeyPair | null> {

let puk = “04D03640597C482DC4684A753BEB6CD18669AF5B77EF90C2CA6EDD25D68A8F54916E445307B2EDD05789373CD1B96DE9F79367F4E9A1005B3845B971EA18007090”;
let prk = “83C74105FC41DD00A48AF1F15A6C82EFC69D9E05E4002713B1D2F2C44DBF4C39”;
//转16进制放入对应的位置 04+x+y
let pk: cryptoFramework.Point = {
x: BigInt(“0xD03640597C482DC4684A753BEB6CD18669AF5B77EF90C2CA6EDD25D68A8F5491”),
y: BigInt(“0x6E445307B2EDD05789373CD1B96DE9F79367F4E9A1005B3845B971EA18007090”)
}
let sk: bigint = BigInt(“0x83C74105FC41DD00A48AF1F15A6C82EFC69D9E05E4002713B1D2F2C44DBF4C39”);
// 密钥对对象数据
let keyPair: cryptoFramework.ECCKeyPairSpec = {
params: this.genSM2CommonSpec(),
sk: sk,
pk: pk,
algName: ‘SM2’,
specType: cryptoFramework.AsyKeySpecType.KEY_PAIR_SPEC
}
let KeyPair: cryptoFramework.KeyPair | null = null;
try {
let KeyPairGenerator: cryptoFramework.AsyKeyGeneratorBySpec;
KeyPairGenerator = cryptoFramework.createAsyKeyGeneratorBySpec(keyPair);
KeyPair = await KeyPairGenerator.generateKeyPair()
.then((keyPair) => {
return keyPair;
})
.catch((e: Error): null => {
console.log(JSON.stringify(e))
return null;
})
} catch (err) {
let e: BusinessError = err as BusinessError;
console.error(sync error, ${e.code}, ${e.message});
}
return KeyPair;
}<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>

genSM2CommonSpec(): cryptoFramework.ECCCommonParamsSpec {
let fieldFp: cryptoFramework.ECFieldFp = {
fieldType: “Fp”,
p: BigInt(“0xFFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF”)
}

let G: cryptoFramework.Point = {
x: BigInt(“0x32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7”),
y: BigInt(“0xBC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0”)
}
let SM2CommonSpec: cryptoFramework.ECCCommonParamsSpec = {
algName: “ECC”,
specType: cryptoFramework.AsyKeySpecType.COMMON_PARAMS_SPEC,
field: fieldFp,
a: BigInt(“0xFFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC”),
b: BigInt(“0x28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93”),
g: G,
n: BigInt(“0xFFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123”),
h: 1
}
return SM2CommonSpec;
}<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>

详细信息请参见：https://developer.huawei.com/consumer/cn/doc/harmonyos-guides/crypto-generate-asym-key-pair-from-key-spec-0000001774120454#ZH-CN_TOPIC_0000001774120454__%E6%A0%B9%E6%8D%AE%E6%A4%AD%E5%9C%86%E6%9B%B2%E7%BA%BF%E5%90%8D%E7%94%9F%E6%88%90sm2%E5%AF%86%E9%92%A5%E5%AF%B9