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1# 使用RSA密钥对分段验签（PKCS1模式）(C/C++)
2
3对应的算法规格请查看[验签算法规格：RSA](crypto-sign-sig-verify-overview.md#rsa)。
4
5## 在CMake脚本中链接相关动态库
6```txt
7target_link_libraries(entry PUBLIC libohcrypto.so)
8```
9
10## 开发步骤
11
121. 调用[OH_CryptoVerify_Create](../../reference/apis-crypto-architecture-kit/_crypto_signature_api.md#oh_cryptoverify_create)，指定字符串参数'RSA1024|PKCS1|SHA256'，与签名的Sign实例保持一致。创建Verify实例，用于完成验签操作。
13
142. 调用[OH_CryptoVerify_Init](../../reference/apis-crypto-architecture-kit/_crypto_signature_api.md#oh_cryptoverify_init)，使用公钥（OH_CryptoPubKey）初始化Verify实例。
15
163. 调用[OH_CryptoVerify_Update](../../reference/apis-crypto-architecture-kit/_crypto_signature_api.md#oh_cryptoverify_update)，传入待验证的数据。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，如果数据量较小，可以直接调用OH_CryptoVerify_Final接口一次性传入。
17
184. 调用[OH_CryptoVerify_Final](../../reference/apis-crypto-architecture-kit/_crypto_signature_api.md#oh_cryptoverify_final)，对数据进行验签。
19
20- 示例：
21
22```c++
23#include "CryptoArchitectureKit/crypto_common.h"
24#include "CryptoArchitectureKit/crypto_asym_key.h"
25#include "CryptoArchitectureKit/crypto_signature.h"
26
27static bool doTestRsaSignatureSeg()
28{
29   OH_CryptoAsymKeyGenerator *keyCtx = nullptr;
30   OH_CryptoKeyPair *keyPair = nullptr;
31   OH_CryptoVerify *verify = nullptr;
32
33   uint8_t plainText[] = {
34      0x43, 0x31, 0x7d, 0xb5, 0x85, 0x2e, 0xd4, 0xef, 0x08, 0x7a, 0x17, 0x96, 0xbc, 0x7c, 0x8f, 0x80,
35      0x8c, 0xa7, 0x63, 0x7f, 0x26, 0x89, 0x8f, 0xf0, 0xfa, 0xa7, 0x51, 0xbd, 0x9c, 0x69, 0x17, 0xf3,
36      0xd1, 0xb5, 0xc7, 0x12, 0xbf, 0xcf, 0x91, 0x25, 0x82, 0x23, 0x6b, 0xd6, 0x64, 0x52, 0x77, 0x93,
37      0x01, 0x9d, 0x70, 0xa3, 0xf4, 0x92, 0x16, 0xec, 0x3f, 0xa7, 0x3c, 0x83, 0x8d, 0x40, 0x41, 0xfc,
38   };
39   Crypto_DataBlob msgBlob = {
40      .data = reinterpret_cast<uint8_t *>(plainText),
41      .len = sizeof(plainText)
42   };
43
44   uint8_t pubKeyText[] = {
45      0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x42, 0x45, 0x47, 0x49, 0x4e, 0x20, 0x52, 0x53, 0x41, 0x20, 0x50,
46      0x55, 0x42, 0x4c, 0x49, 0x43, 0x20, 0x4b, 0x45, 0x59, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x0a, 0x4d,
47      0x49, 0x47, 0x4a, 0x41, 0x6f, 0x47, 0x42, 0x41, 0x4d, 0x78, 0x63, 0x44, 0x4d, 0x6f, 0x61, 0x59,
48      0x52, 0x58, 0x6f, 0x78, 0x65, 0x69, 0x33, 0x49, 0x6d, 0x33, 0x33, 0x78, 0x4a, 0x76, 0x61, 0x73,
49      0x63, 0x43, 0x62, 0x77, 0x31, 0x6f, 0x73, 0x63, 0x32, 0x56, 0x56, 0x69, 0x47, 0x6a, 0x56, 0x47,
50      0x47, 0x4a, 0x37, 0x6c, 0x75, 0x4e, 0x41, 0x58, 0x6b, 0x6a, 0x73, 0x56, 0x46, 0x64, 0x35, 0x0a,
51      0x58, 0x37, 0x4c, 0x4d, 0x6c, 0x46, 0x34, 0x63, 0x35, 0x5a, 0x75, 0x59, 0x2f, 0x61, 0x69, 0x57,
52      0x77, 0x70, 0x54, 0x69, 0x63, 0x62, 0x67, 0x49, 0x33, 0x43, 0x66, 0x50, 0x6f, 0x32, 0x6a, 0x6c,
53      0x52, 0x74, 0x67, 0x41, 0x46, 0x6b, 0x44, 0x71, 0x7a, 0x4b, 0x53, 0x46, 0x62, 0x46, 0x47, 0x51,
54      0x6b, 0x43, 0x6e, 0x64, 0x63, 0x2b, 0x54, 0x59, 0x6b, 0x5a, 0x42, 0x32, 0x70, 0x45, 0x6f, 0x72,
55      0x0a, 0x7a, 0x73, 0x61, 0x56, 0x58, 0x77, 0x5a, 0x47, 0x45, 0x34, 0x41, 0x43, 0x70, 0x59, 0x35,
56      0x79, 0x65, 0x66, 0x49, 0x44, 0x6c, 0x45, 0x57, 0x49, 0x51, 0x4f, 0x6a, 0x59, 0x4b, 0x2f, 0x6c,
57      0x58, 0x71, 0x7a, 0x48, 0x47, 0x69, 0x4f, 0x69, 0x32, 0x75, 0x4a, 0x45, 0x75, 0x44, 0x43, 0x50,
58      0x6a, 0x51, 0x64, 0x6a, 0x54, 0x41, 0x67, 0x4d, 0x42, 0x41, 0x41, 0x45, 0x3d, 0x0a, 0x2d, 0x2d,
59      0x2d, 0x2d, 0x2d, 0x45, 0x4e, 0x44, 0x20, 0x52, 0x53, 0x41, 0x20, 0x50, 0x55, 0x42, 0x4c, 0x49,
60      0x43, 0x20, 0x4b, 0x45, 0x59, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x0a,
61   };
62
63   Crypto_DataBlob keyBlob = {
64      .data = reinterpret_cast<uint8_t *>(pubKeyText),
65      .len = sizeof(pubKeyText)
66   };
67
68   uint8_t signText[] = {
69      0x68, 0x2f, 0x3b, 0xe6, 0xa6, 0x5c, 0xb8, 0x60, 0xd4, 0xe1, 0x64, 0xa7, 0xd8, 0x0c, 0x9c, 0x89,
70      0x39, 0xb4, 0xf0, 0xb7, 0xad, 0xb5, 0x8a, 0x71, 0x04, 0xf1, 0xa5, 0x63, 0xdd, 0x32, 0x6a, 0x44,
71      0xeb, 0xff, 0xb7, 0xe6, 0x85, 0xe5, 0xa5, 0x55, 0x5d, 0x5b, 0x28, 0x53, 0x63, 0xe4, 0xb3, 0xb9,
72      0xa8, 0x70, 0xc8, 0x8f, 0xcd, 0x21, 0x8d, 0xe6, 0x1f, 0xe5, 0x78, 0x34, 0xd3, 0x45, 0x0c, 0x9c,
73      0x7a, 0x22, 0x1b, 0x63, 0x55, 0xca, 0x14, 0xa5, 0x0c, 0x7a, 0x40, 0x8e, 0xa1, 0x14, 0x78, 0xa1,
74      0xf1, 0x36, 0x78, 0xbd, 0xba, 0x37, 0x3b, 0x5b, 0xb0, 0x8e, 0xb3, 0x4a, 0x9b, 0x1b, 0x0c, 0xfa,
75      0xfa, 0xc7, 0x9f, 0xb1, 0x35, 0x48, 0x82, 0x73, 0xf8, 0x6b, 0xd4, 0x76, 0x33, 0x5c, 0xed, 0x9c,
76      0xd8, 0x4b, 0xc9, 0x92, 0xa0, 0x3f, 0x6e, 0xba, 0x78, 0x2e, 0x80, 0x78, 0x1e, 0x74, 0xa0, 0x47,
77   };
78
79   Crypto_DataBlob signBlob = {
80      .data = reinterpret_cast<uint8_t *>(signText),
81      .len = sizeof(signText)
82   };
83
84   // keypair
85   OH_Crypto_ErrCode ret = CRYPTO_SUCCESS;
86   ret = OH_CryptoAsymKeyGenerator_Create((const char *)"RSA2048", &keyCtx);
87   if (ret != CRYPTO_SUCCESS) {
88      return false;
89   }
90   ret = OH_CryptoAsymKeyGenerator_Convert(keyCtx, CRYPTO_PEM, &keyBlob, nullptr, &keyPair);
91   if (ret != CRYPTO_SUCCESS) {
92      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
93      return false;
94   }
95   OH_CryptoPubKey *pubKey = OH_CryptoKeyPair_GetPubKey(keyPair);
96   // verify
97   ret = OH_CryptoVerify_Create((const char *)"RSA1024|PKCS1|SHA256", &verify);
98   if (ret != CRYPTO_SUCCESS) {
99      OH_CryptoVerify_Destroy(verify);
100      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
101      return false;
102   }
103   int blockSize = 20;
104   int cnt_s = 64 / blockSize;
105   int rem_s = 64 % blockSize;
106   ret = OH_CryptoVerify_Init(verify, pubKey);
107   if (ret != CRYPTO_SUCCESS) {
108      OH_CryptoVerify_Destroy(verify);
109      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
110      return false;
111   }
112   for (int i = 0; i < cnt_s; i++) {
113      msgBlob.len = blockSize;
114      ret = OH_CryptoVerify_Update(verify, (Crypto_DataBlob *)&msgBlob);
115      if (ret != CRYPTO_SUCCESS) {
116         OH_CryptoVerify_Destroy(verify);
117         OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
118         return false;
119      }
120      msgBlob.data += blockSize;
121   }
122   bool res = false;
123   if (rem_s > 0) {
124      msgBlob.len = rem_s;
125      res = OH_CryptoVerify_Final(verify, (Crypto_DataBlob *)&msgBlob, (Crypto_DataBlob *)&signBlob);
126      if (res != true) {
127         OH_CryptoVerify_Destroy(verify);
128         OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
129         return false;
130      }
131   }
132
133   msgBlob.data -=  64 - rem_s;
134   msgBlob.len = 64;
135
136   OH_CryptoVerify_Destroy(verify);
137   OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
138   OH_CryptoKeyPair_Destroy(keyPair);
139   return res;
140}
141```
142