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1# 使用RSA密钥对签名验签（PSS模式）
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4对应的算法规格请查看[签名验签算法规格：RSA](crypto-sign-sig-verify-overview.md#rsa)。
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6
7**签名**
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101. 调用[cryptoFramework.createAsyKeyGeneratorBySpec](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#cryptoframeworkcreateasykeygeneratorbyspec10)、[AsyKeyGeneratorBySpec.generateKeyPair](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#generatekeypair-3)，指定密钥参数，生成RSA非对称密钥对（KeyPair）。
11   如何生成RSA非对称密钥，开发者可参考下文示例，并结合[非对称密钥生成和转换规格：RSA](crypto-asym-key-generation-conversion-spec.md#rsa)和[指定密钥参数生成密钥对](crypto-generate-asym-key-pair-from-key-spec.md)理解，参考文档与当前示例可能存在入参差异，请在阅读时注意区分。
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132. 调用[cryptoFramework.createSign](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#cryptoframeworkcreatesign)，指定字符串参数'RSA|PSS|SHA256|MGF1_SHA256'，创建非对称密钥类型为不带长度的RSA、填充模式为PSS、摘要算法为SHA256、掩码算法为MGF1_SHA256的Sign实例，用于完成签名操作。
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153. 调用[Sign.init](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#init-3)，使用私钥（PriKey）初始化Sign实例。
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174. 调用[Sign.setSignSpec](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#setsignspec10)，设置签名参数。此处设置盐值的长度（SignSpecItem.PSS_SALT_LEN_NUM）为32字节。在验签时将校验此数据。
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195. 调用[Sign.getSignSpec](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#getsignspec10)，获取其他签名参数。
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216. 调用[Sign.update](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#update-3)，传入待签名的数据。
22   当前单次update长度没有限制，开发者可以根据数据量判断如何调用update。
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247. 调用[Sign.sign](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#sign-2)，生成数据签名。
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27**验签**
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301. 调用[cryptoFramework.createVerify](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#cryptoframeworkcreateverify)，指定字符串参数'RSA2048|PSS|SHA256|MGF1_SHA256'，创建非对称密钥类型为RSA2048、填充模式为PSS、摘要算法为SHA256、掩码算法为MGF1_SHA256的Verify实例，用于完成验签操作。
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322. 调用[Verify.setVerifySpec](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#setverifyspec10)，设置签名参数。需要与签名时设置的保持一致。
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343. 调用[Verify.init](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#init-5)，使用公钥（PubKey）初始化Verify实例。
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364. 调用[Verify.update](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#update-5)，传入待验证的数据。
37   当前单次update长度没有限制，开发者可以根据数据量判断如何调用update。
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395. 调用[Verify.verify](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#verify-2)，对数据进行验签。
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42```ts
43import cryptoFramework from '@ohos.security.cryptoFramework';
44import buffer from '@ohos.buffer';
45// 根据密钥参数属性构造RSA非对称密钥对密钥参数
46function genRsaKeyPairSpec(nIn: bigint, eIn: bigint, dIn: bigint) {
47  let rsaCommSpec: cryptoFramework.RSACommonParamsSpec = {
48    n: nIn,
49    algName: "RSA",
50    specType: cryptoFramework.AsyKeySpecType.COMMON_PARAMS_SPEC
51  };
52  let rsaKeyPairSpec: cryptoFramework.RSAKeyPairSpec = {
53    params: rsaCommSpec,
54    sk: dIn,
55    pk: eIn,
56    algName: "RSA",
57    specType: cryptoFramework.AsyKeySpecType.KEY_PAIR_SPEC
58  };
59  return rsaKeyPairSpec;
60}
61// 生成RSA2048密钥对参数
62function genRsa2048KeyPairSpec(): cryptoFramework.RSAKeyPairSpec {
63  let nIn = BigInt("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");
64  let eIn = BigInt("0x010001");
65  let dIn = BigInt("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");
66  return genRsaKeyPairSpec(nIn, eIn, dIn);
67}
68
69async function verifyMessagePSS() {
70  // 完整的明文被拆分为input1和input2
71  let plan1 = "This is Sign test plan1";
72  let plan2 = "This is Sign test plan2";
73  let input1: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from(plan1, 'utf-8').buffer) };
74  let input2: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from(plan2, 'utf-8').buffer) };
75  // 获得RSA密钥对密钥参数对象
76  let rsaKeyPairSpec = genRsa2048KeyPairSpec();
77  // 构造RSA密钥对生成器
78  let rsaGeneratorSpec = cryptoFramework.createAsyKeyGeneratorBySpec(rsaKeyPairSpec);
79  // sign和verfiy均支持RSA密钥带长度/不带长度的写法
80  let signer = cryptoFramework.createSign("RSA|PSS|SHA256|MGF1_SHA256");
81  let verifyer = cryptoFramework.createVerify("RSA2048|PSS|SHA256|MGF1_SHA256");
82  let keyPair = await rsaGeneratorSpec.generateKeyPair();
83  await signer.init(keyPair.priKey);
84  // 在签名初始化后，对PSS参数进行set和get操作
85  let setN = 32;
86  signer.setSignSpec(cryptoFramework.SignSpecItem.PSS_SALT_LEN_NUM, setN);
87  let saltLen = signer.getSignSpec(cryptoFramework.SignSpecItem.PSS_SALT_LEN_NUM);
88  console.info("SaltLen == " + saltLen);
89  let tf = signer.getSignSpec(cryptoFramework.SignSpecItem.PSS_TRAILER_FIELD_NUM);
90  console.info("trailer field == " + tf);
91  let md = signer.getSignSpec(cryptoFramework.SignSpecItem.PSS_MD_NAME_STR);
92  console.info("md == " + md);
93  let mgf = signer.getSignSpec(cryptoFramework.SignSpecItem.PSS_MGF_NAME_STR);
94  console.info("mgf == " + mgf);
95  let mgf1Md = signer.getSignSpec(cryptoFramework.SignSpecItem.PSS_MGF1_MD_STR);
96  console.info("mgf1Md == " + mgf1Md);
97  await signer.update(input1);
98  let signMessageBlob = await signer.sign(input2);
99  // 在验签初始化前，对PSS参数进行set和get操作
100  verifyer.setVerifySpec(cryptoFramework.SignSpecItem.PSS_SALT_LEN_NUM, setN);
101  saltLen = verifyer.getVerifySpec(cryptoFramework.SignSpecItem.PSS_SALT_LEN_NUM);
102  console.info("SaltLen == " + saltLen);
103  tf = verifyer.getVerifySpec(cryptoFramework.SignSpecItem.PSS_TRAILER_FIELD_NUM);
104  console.info("trailer field == " + tf);
105  md = verifyer.getVerifySpec(cryptoFramework.SignSpecItem.PSS_MD_NAME_STR);
106  console.info("md == " + md);
107  mgf = verifyer.getVerifySpec(cryptoFramework.SignSpecItem.PSS_MGF_NAME_STR);
108  console.info("mgf == " + mgf);
109  mgf1Md = verifyer.getVerifySpec(cryptoFramework.SignSpecItem.PSS_MGF1_MD_STR);
110  await verifyer.init(keyPair.pubKey);
111  await verifyer.update(input1);
112  let verifyResult = await verifyer.verify(input2, signMessageBlob);
113  if (verifyResult == true) {
114    console.info('verify success');
115  } else {
116    console.error('verify failed');
117  }
118}
119```
120