• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1# 使用ECDSA密钥对验签(C/C++)
2
3对应的算法规格请查看[签名验签算法规格：ECDSA](crypto-sign-sig-verify-overview.md#ecdsa)。
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'ECC256|SHA256'，创建非对称密钥类型为ECC256、摘要算法为SHA256的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```c++
21#include "CryptoArchitectureKit/crypto_common.h"
22#include "CryptoArchitectureKit/crypto_signature.h"
23#include "CryptoArchitectureKit/crypto_asym_key.h"
24
25static bool doTestEcdsaSignature()
26{
27   OH_CryptoAsymKeyGenerator *keyCtx = nullptr;
28   OH_CryptoKeyPair *keyPair = nullptr;
29   OH_CryptoVerify *verify = nullptr;
30
31   uint8_t plainText[] = {
32      0xe4, 0x2b, 0xcc, 0x08, 0x11, 0x79, 0x16, 0x1b, 0x35, 0x7f, 0xb3, 0xaf, 0x40, 0x3b, 0x3f, 0x7c
33   }; // 待验证数据，仅供参考。
34   Crypto_DataBlob msgBlob = {
35      .data = reinterpret_cast<uint8_t *>(plainText),
36      .len = sizeof(plainText)
37   };
38
39   uint8_t pubKeyText[] = {
40      0x30, 0x39, 0x30, 0x13, 0x06, 0x07, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x02, 0x01, 0x06, 0x08, 0x2a,
41      0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07, 0x03, 0x22, 0x00, 0x03, 0x4d, 0xe4, 0xbb, 0x11, 0x10,
42      0x1a, 0xd2, 0x05, 0x74, 0xf1, 0x0b, 0xb4, 0x75, 0x57, 0xf4, 0x3e, 0x55, 0x14, 0x17, 0x05, 0x4a,
43      0xb2, 0xfb, 0x8c, 0x84, 0x64, 0x38, 0x02, 0xa0, 0x2a, 0xa6, 0xf0
44   }; // DER格式的公钥编码数据，仅供参考。
45
46   Crypto_DataBlob keyBlob = {
47      .data = reinterpret_cast<uint8_t *>(pubKeyText),
48      .len = sizeof(pubKeyText)
49   };
50
51   uint8_t signText[] = {
52      0x30, 0x44, 0x02, 0x20, 0x21, 0x89, 0x99, 0xb1, 0x56, 0x4e, 0x3a, 0x2c, 0x16, 0x08, 0xb5, 0x8a,
53      0x06, 0x6f, 0x67, 0x47, 0x1b, 0x04, 0x18, 0x7d, 0x53, 0x2d, 0xba, 0x00, 0x38, 0xd9, 0xe3, 0xe7,
54      0x8c, 0xcf, 0x76, 0x83, 0x02, 0x20, 0x13, 0x54, 0x84, 0x9d, 0x73, 0x40, 0xc3, 0x92, 0x66, 0xdc,
55      0x3e, 0xc9, 0xf1, 0x4c, 0x33, 0x84, 0x2a, 0x76, 0xaf, 0xc6, 0x61, 0x84, 0x5c, 0xae, 0x4b, 0x0d,
56      0x3c, 0xb0, 0xc8, 0x04, 0x89, 0x71
57   }; // 签名数据，仅供参考。
58
59   Crypto_DataBlob signBlob = {
60      .data = reinterpret_cast<uint8_t *>(signText),
61      .len = sizeof(signText)
62   };
63
64   OH_Crypto_ErrCode ret = CRYPTO_SUCCESS;
65
66   ret = OH_CryptoAsymKeyGenerator_Create((const char *)"ECC256", &keyCtx);
67   if (ret != CRYPTO_SUCCESS) {
68      return false;
69   }
70   ret = OH_CryptoAsymKeyGenerator_Convert(keyCtx, CRYPTO_DER, &keyBlob, nullptr, &keyPair); // 将DER格式的公钥编码数据转换为OH_CryptoKeyPair。
71   if (ret != CRYPTO_SUCCESS) {
72      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
73      return false;
74   }
75   OH_CryptoPubKey *pubKey = OH_CryptoKeyPair_GetPubKey(keyPair); // 获取公钥对象。
76   // verify
77   ret = OH_CryptoVerify_Create((const char *)"ECC256|SHA256", &verify); // 创建Verify实例。
78   if (ret != CRYPTO_SUCCESS) {
79      OH_CryptoVerify_Destroy(verify);
80      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
81      return false;
82   }
83   ret = OH_CryptoVerify_Init(verify, pubKey);
84   if (ret != CRYPTO_SUCCESS) {
85      OH_CryptoVerify_Destroy(verify);
86      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
87      return false;
88   }
89   bool res = OH_CryptoVerify_Final(verify, &msgBlob, &signBlob);
90   if (res != true) {
91      OH_CryptoVerify_Destroy(verify);
92      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
93      return false;
94   }
95
96   OH_CryptoVerify_Destroy(verify);
97   OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
98   OH_CryptoKeyPair_Destroy(keyPair);
99   return res;
100}
101```
102