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1# 使用RSA密钥对（PKCS1模式）签名恢复(C/C++)
2
3<!--Kit: Crypto Architecture Kit-->
4<!--Subsystem: Security-->
5<!--Owner: @zxz--3-->
6<!--Designer: @lanming-->
7<!--Tester: @PAFT-->
8<!--Adviser: @zengyawen-->
9
10对应的算法规格请查看[验签算法规格：RSA](crypto-sign-sig-verify-overview.md#rsa)。
11
12## 在CMake脚本中链接相关动态库
13```txt
14target_link_libraries(entry PUBLIC libohcrypto.so)
15```
16
17## 开发步骤
18
191. 调用[OH_CryptoVerify_Create](../../reference/apis-crypto-architecture-kit/capi-crypto-signature-h.md#oh_cryptoverify_create)，指定字符串参数'RSA1024|PKCS1|SHA256|Recover'，与签名的Sign实例保持一致。创建Verify实例，用于完成验签操作。
20
212. 调用[OH_CryptoVerify_Init](../../reference/apis-crypto-architecture-kit/capi-crypto-signature-h.md#oh_cryptoverify_init)，使用公钥（OH_CryptoPubKey）初始化Verify实例。
22
233. 调用[OH_CryptoVerify_Recover](../../reference/apis-crypto-architecture-kit/capi-crypto-signature-h.md#oh_cryptoverify_recover)，对数据进行签名恢复。
24
25```c++
26#include "CryptoArchitectureKit/crypto_common.h"
27#include "CryptoArchitectureKit/crypto_signature.h"
28#include "CryptoArchitectureKit/crypto_asym_key.h"
29
30static OH_Crypto_ErrCode doTestRsaSignatureRecover()
31{
32   OH_CryptoAsymKeyGenerator *keyCtx = nullptr;
33   OH_CryptoKeyPair *keyPair = nullptr;
34   OH_CryptoVerify *verify = nullptr;
35
36   uint8_t plainText[] = {
37      0xc4, 0xa5, 0xe5, 0x45, 0xee, 0x71, 0x5e, 0x3b, 0x24, 0x1d, 0x7e, 0x62, 0xd6, 0x6b, 0xab, 0x98,
38      0x88, 0x0f, 0xaf, 0x1e, 0x96, 0xa0, 0x6c, 0xa5, 0x0d, 0x29, 0xfd, 0xcc, 0xef, 0xf6, 0x2b, 0x92
39   };
40   Crypto_DataBlob msgBlob = {
41      .data = reinterpret_cast<uint8_t *>(plainText),
42      .len = sizeof(plainText)
43   };
44
45   uint8_t pubKeyText[] = {
46      0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x42, 0x45, 0x47, 0x49, 0x4e, 0x20, 0x52, 0x53, 0x41, 0x20, 0x50,
47      0x55, 0x42, 0x4c, 0x49, 0x43, 0x20, 0x4b, 0x45, 0x59, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x0a, 0x4d,
48      0x49, 0x47, 0x4a, 0x41, 0x6f, 0x47, 0x42, 0x41, 0x4b, 0x72, 0x55, 0x74, 0x74, 0x64, 0x76, 0x73,
49      0x2b, 0x62, 0x6e, 0x4d, 0x2f, 0x6f, 0x4e, 0x75, 0x39, 0x45, 0x42, 0x78, 0x35, 0x64, 0x49, 0x6d,
50      0x61, 0x70, 0x52, 0x67, 0x4d, 0x6a, 0x4b, 0x41, 0x38, 0x51, 0x48, 0x4b, 0x61, 0x75, 0x2f, 0x6c,
51      0x58, 0x50, 0x50, 0x68, 0x76, 0x38, 0x30, 0x69, 0x59, 0x4c, 0x46, 0x2b, 0x79, 0x35, 0x35, 0x0a,
52      0x6d, 0x42, 0x2f, 0x38, 0x2b, 0x4b, 0x68, 0x34, 0x34, 0x43, 0x2b, 0x5a, 0x76, 0x6f, 0x78, 0x5a,
53      0x66, 0x38, 0x78, 0x34, 0x6e, 0x78, 0x6f, 0x71, 0x76, 0x4f, 0x6f, 0x73, 0x32, 0x44, 0x55, 0x69,
54      0x51, 0x44, 0x4f, 0x4a, 0x35, 0x63, 0x57, 0x68, 0x5a, 0x62, 0x4d, 0x71, 0x4d, 0x42, 0x71, 0x62,
55      0x39, 0x30, 0x4e, 0x39, 0x63, 0x2f, 0x44, 0x51, 0x67, 0x39, 0x34, 0x63, 0x52, 0x7a, 0x35, 0x66,
56      0x0a, 0x68, 0x55, 0x66, 0x6d, 0x66, 0x6d, 0x54, 0x41, 0x46, 0x6a, 0x5a, 0x53, 0x33, 0x78, 0x6c,
57      0x78, 0x77, 0x6e, 0x50, 0x77, 0x66, 0x66, 0x39, 0x71, 0x44, 0x79, 0x4c, 0x63, 0x5a, 0x55, 0x6b,
58      0x6e, 0x64, 0x43, 0x30, 0x50, 0x77, 0x72, 0x6c, 0x38, 0x72, 0x70, 0x4b, 0x7a, 0x50, 0x47, 0x63,
59      0x71, 0x4e, 0x67, 0x33, 0x5a, 0x41, 0x67, 0x4d, 0x42, 0x41, 0x41, 0x45, 0x3d, 0x0a, 0x2d, 0x2d,
60      0x2d, 0x2d, 0x2d, 0x45, 0x4e, 0x44, 0x20, 0x52, 0x53, 0x41, 0x20, 0x50, 0x55, 0x42, 0x4c, 0x49,
61      0x43, 0x20, 0x4b, 0x45, 0x59, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x0a,
62   };
63
64   Crypto_DataBlob keyBlob = {
65      .data = reinterpret_cast<uint8_t *>(pubKeyText),
66      .len = sizeof(pubKeyText)
67   };
68
69   uint8_t signText[] = {
70      0x1f, 0xe3, 0xcf, 0x8d, 0x94, 0xb4, 0xa0, 0x9e, 0xf1, 0x0c, 0x38, 0x59, 0xcb, 0x5b, 0x89, 0xc9,
71      0x66, 0x8b, 0xfd, 0x8d, 0x1e, 0x37, 0xfa, 0x5e, 0x1b, 0xb1, 0x51, 0x07, 0xf1, 0xb0, 0x7d, 0x18,
72      0x2d, 0x82, 0x2a, 0x04, 0xa4, 0x4e, 0x94, 0x7e, 0x76, 0xb8, 0xa4, 0x78, 0x90, 0x2f, 0x43, 0x1d,
73      0x95, 0x80, 0xd7, 0xb3, 0x46, 0x4d, 0x58, 0x4b, 0xcd, 0x1f, 0x1d, 0xb3, 0x1f, 0x6b, 0x15, 0xd8,
74      0x33, 0x51, 0x1d, 0x36, 0x12, 0x39, 0x92, 0xb4, 0x4d, 0xe2, 0x89, 0x26, 0x01, 0xe9, 0x1f, 0xc0,
75      0x9c, 0x7c, 0xd8, 0xeb, 0x47, 0xff, 0xfb, 0x5d, 0x98, 0x9a, 0x02, 0x6a, 0x16, 0x37, 0xb1, 0xf5,
76      0x08, 0x4d, 0xd7, 0xa0, 0xf2, 0x9e, 0xbe, 0x4b, 0x54, 0x77, 0x94, 0x95, 0x4b, 0x97, 0x10, 0x22,
77      0x49, 0xa5, 0x2e, 0x05, 0x86, 0xfd, 0x6f, 0x9a, 0x40, 0xe6, 0x43, 0xab, 0xc5, 0xbc, 0xac, 0x21,
78   };
79
80   Crypto_DataBlob signBlob = {
81      .data = reinterpret_cast<uint8_t *>(signText),
82      .len = sizeof(signText)
83   };
84
85   // keypair
86   OH_Crypto_ErrCode ret = CRYPTO_SUCCESS;
87   ret = OH_CryptoAsymKeyGenerator_Create((const char *)"RSA2048", &keyCtx);
88   if (ret != CRYPTO_SUCCESS) {
89      return ret;
90   }
91   ret = OH_CryptoAsymKeyGenerator_Convert(keyCtx, CRYPTO_PEM, &keyBlob, nullptr, &keyPair);
92   if (ret != CRYPTO_SUCCESS) {
93      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
94      return ret;
95   }
96   OH_CryptoPubKey *pubKey = OH_CryptoKeyPair_GetPubKey(keyPair);
97   // verify
98   ret = OH_CryptoVerify_Create((const char *)"RSA1024|PKCS1|SHA256|Recover", &verify);
99   if (ret != CRYPTO_SUCCESS) {
100      OH_CryptoVerify_Destroy(verify);
101      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
102      return ret;
103   }
104   ret = OH_CryptoVerify_Init(verify, pubKey);
105   if (ret != CRYPTO_SUCCESS) {
106      OH_CryptoVerify_Destroy(verify);
107      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
108      return ret;
109   }
110   Crypto_DataBlob rawSignData = {.data = nullptr, .len = 0};
111   ret = OH_CryptoVerify_Recover(verify, (Crypto_DataBlob *)&signBlob, &rawSignData);
112   if (ret != CRYPTO_SUCCESS) {
113      OH_CryptoVerify_Destroy(verify);
114      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
115      return ret;
116   }
117
118   OH_CryptoVerify_Destroy(verify);
119   OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
120   OH_CryptoKeyPair_Destroy(keyPair);
121   return ret;
122}
123```
124