对应的算法规格请查看[验签算法规格：RSA](https://developer.huawei.com/consumer/cn/doc/harmonyos-guides/crypto-sign-sig-verify-overview#rsa)。

## 在CMake脚本中链接相关动态库

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```
1. target_link_libraries(entry PUBLIC libohcrypto.so)
```

## 开发步骤

1. 调用[OH\_CryptoVerify\_Create](https://developer.huawei.com/consumer/cn/doc/harmonyos-references/capi-crypto-signature-h#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。
2. 调用[OH\_CryptoVerify\_Init](https://developer.huawei.com/consumer/cn/doc/harmonyos-references/capi-crypto-signature-h#oh_cryptoverify_init)，使用公钥（OH\_CryptoPubKey）初始化Verify实例。
3. 调用[OH\_CryptoVerify\_Recover](https://developer.huawei.com/consumer/cn/doc/harmonyos-references/capi-crypto-signature-h#oh_cryptoverify_recover)，对数据进行签名恢复。

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```
1. #include "CryptoArchitectureKit/crypto_common.h"
2. #include "CryptoArchitectureKit/crypto_signature.h"
3. #include "CryptoArchitectureKit/crypto_asym_key.h"

5. static OH_Crypto_ErrCode doTestRsaSignatureRecover()
6. {
7. OH_CryptoAsymKeyGenerator *keyCtx = nullptr;
8. OH_CryptoKeyPair *keyPair = nullptr;
9. OH_CryptoVerify *verify = nullptr;

11. uint8_t plainText[] = {
12. 0xc4, 0xa5, 0xe5, 0x45, 0xee, 0x71, 0x5e, 0x3b, 0x24, 0x1d, 0x7e, 0x62, 0xd6, 0x6b, 0xab, 0x98,
13. 0x88, 0x0f, 0xaf, 0x1e, 0x96, 0xa0, 0x6c, 0xa5, 0x0d, 0x29, 0xfd, 0xcc, 0xef, 0xf6, 0x2b, 0x92
14. };
15. Crypto_DataBlob msgBlob = {
16. .data = reinterpret_cast<uint8_t *>(plainText),
17. .len = sizeof(plainText)
18. };

20. uint8_t pubKeyText[] = {
21. 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x42, 0x45, 0x47, 0x49, 0x4e, 0x20, 0x52, 0x53, 0x41, 0x20, 0x50,
22. 0x55, 0x42, 0x4c, 0x49, 0x43, 0x20, 0x4b, 0x45, 0x59, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x0a, 0x4d,
23. 0x49, 0x47, 0x4a, 0x41, 0x6f, 0x47, 0x42, 0x41, 0x4b, 0x72, 0x55, 0x74, 0x74, 0x64, 0x76, 0x73,
24. 0x2b, 0x62, 0x6e, 0x4d, 0x2f, 0x6f, 0x4e, 0x75, 0x39, 0x45, 0x42, 0x78, 0x35, 0x64, 0x49, 0x6d,
25. 0x61, 0x70, 0x52, 0x67, 0x4d, 0x6a, 0x4b, 0x41, 0x38, 0x51, 0x48, 0x4b, 0x61, 0x75, 0x2f, 0x6c,
26. 0x58, 0x50, 0x50, 0x68, 0x76, 0x38, 0x30, 0x69, 0x59, 0x4c, 0x46, 0x2b, 0x79, 0x35, 0x35, 0x0a,
27. 0x6d, 0x42, 0x2f, 0x38, 0x2b, 0x4b, 0x68, 0x34, 0x34, 0x43, 0x2b, 0x5a, 0x76, 0x6f, 0x78, 0x5a,
28. 0x66, 0x38, 0x78, 0x34, 0x6e, 0x78, 0x6f, 0x71, 0x76, 0x4f, 0x6f, 0x73, 0x32, 0x44, 0x55, 0x69,
29. 0x51, 0x44, 0x4f, 0x4a, 0x35, 0x63, 0x57, 0x68, 0x5a, 0x62, 0x4d, 0x71, 0x4d, 0x42, 0x71, 0x62,
30. 0x39, 0x30, 0x4e, 0x39, 0x63, 0x2f, 0x44, 0x51, 0x67, 0x39, 0x34, 0x63, 0x52, 0x7a, 0x35, 0x66,
31. 0x0a, 0x68, 0x55, 0x66, 0x6d, 0x66, 0x6d, 0x54, 0x41, 0x46, 0x6a, 0x5a, 0x53, 0x33, 0x78, 0x6c,
32. 0x78, 0x77, 0x6e, 0x50, 0x77, 0x66, 0x66, 0x39, 0x71, 0x44, 0x79, 0x4c, 0x63, 0x5a, 0x55, 0x6b,
33. 0x6e, 0x64, 0x43, 0x30, 0x50, 0x77, 0x72, 0x6c, 0x38, 0x72, 0x70, 0x4b, 0x7a, 0x50, 0x47, 0x63,
34. 0x71, 0x4e, 0x67, 0x33, 0x5a, 0x41, 0x67, 0x4d, 0x42, 0x41, 0x41, 0x45, 0x3d, 0x0a, 0x2d, 0x2d,
35. 0x2d, 0x2d, 0x2d, 0x45, 0x4e, 0x44, 0x20, 0x52, 0x53, 0x41, 0x20, 0x50, 0x55, 0x42, 0x4c, 0x49,
36. 0x43, 0x20, 0x4b, 0x45, 0x59, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x0a,
37. };

39. Crypto_DataBlob keyBlob = {
40. .data = reinterpret_cast<uint8_t *>(pubKeyText),
41. .len = sizeof(pubKeyText)
42. };

44. uint8_t signText[] = {
45. 0x1f, 0xe3, 0xcf, 0x8d, 0x94, 0xb4, 0xa0, 0x9e, 0xf1, 0x0c, 0x38, 0x59, 0xcb, 0x5b, 0x89, 0xc9,
46. 0x66, 0x8b, 0xfd, 0x8d, 0x1e, 0x37, 0xfa, 0x5e, 0x1b, 0xb1, 0x51, 0x07, 0xf1, 0xb0, 0x7d, 0x18,
47. 0x2d, 0x82, 0x2a, 0x04, 0xa4, 0x4e, 0x94, 0x7e, 0x76, 0xb8, 0xa4, 0x78, 0x90, 0x2f, 0x43, 0x1d,
48. 0x95, 0x80, 0xd7, 0xb3, 0x46, 0x4d, 0x58, 0x4b, 0xcd, 0x1f, 0x1d, 0xb3, 0x1f, 0x6b, 0x15, 0xd8,
49. 0x33, 0x51, 0x1d, 0x36, 0x12, 0x39, 0x92, 0xb4, 0x4d, 0xe2, 0x89, 0x26, 0x01, 0xe9, 0x1f, 0xc0,
50. 0x9c, 0x7c, 0xd8, 0xeb, 0x47, 0xff, 0xfb, 0x5d, 0x98, 0x9a, 0x02, 0x6a, 0x16, 0x37, 0xb1, 0xf5,
51. 0x08, 0x4d, 0xd7, 0xa0, 0xf2, 0x9e, 0xbe, 0x4b, 0x54, 0x77, 0x94, 0x95, 0x4b, 0x97, 0x10, 0x22,
52. 0x49, 0xa5, 0x2e, 0x05, 0x86, 0xfd, 0x6f, 0x9a, 0x40, 0xe6, 0x43, 0xab, 0xc5, 0xbc, 0xac, 0x21,
53. };

55. Crypto_DataBlob signBlob = {
56. .data = reinterpret_cast<uint8_t *>(signText),
57. .len = sizeof(signText)
58. };

60. // keypair
61. OH_Crypto_ErrCode ret = CRYPTO_SUCCESS;
62. ret = OH_CryptoAsymKeyGenerator_Create((const char *)"RSA2048", &keyCtx);
63. if (ret != CRYPTO_SUCCESS) {
64. return ret;
65. }
66. ret = OH_CryptoAsymKeyGenerator_Convert(keyCtx, CRYPTO_PEM, &keyBlob, nullptr, &keyPair);
67. if (ret != CRYPTO_SUCCESS) {
68. OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
69. return ret;
70. }
71. OH_CryptoPubKey *pubKey = OH_CryptoKeyPair_GetPubKey(keyPair);
72. // verify
73. ret = OH_CryptoVerify_Create((const char *)"RSA1024|PKCS1|SHA256|Recover", &verify);
74. if (ret != CRYPTO_SUCCESS) {
75. OH_CryptoVerify_Destroy(verify);
76. OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
77. return ret;
78. }
79. ret = OH_CryptoVerify_Init(verify, pubKey);
80. if (ret != CRYPTO_SUCCESS) {
81. OH_CryptoVerify_Destroy(verify);
82. OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
83. return ret;
84. }
85. Crypto_DataBlob rawSignData = {.data = nullptr, .len = 0};
86. ret = OH_CryptoVerify_Recover(verify, (Crypto_DataBlob *)&signBlob, &rawSignData);
87. if (ret != CRYPTO_SUCCESS) {
88. OH_CryptoVerify_Destroy(verify);
89. OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
90. return ret;
91. }

93. OH_CryptoVerify_Destroy(verify);
94. OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
95. OH_CryptoKeyPair_Destroy(keyPair);
96. return ret;
97. }
```