1# Signing and Signature Verification with an ECDSA Key Pair (C/C++)
2
3
4For details about the algorithm specifications, see [ECDSA](crypto-sign-sig-verify-overview.md#ecdsa).
5
6
7## Adding the Dynamic Library in the CMake Script
8```txt
9   target_link_libraries(entry PUBLIC libohcrypto.so)
10```
11
12## How to Develop
13
14
15
161. Use [OH_CryptoVerify_Create](../../reference/apis-crypto-architecture-kit/_crypto_signature_api.md#oh_cryptoverify_create) with the string parameter **'ECC256|SHA256'** to create a **Verify** instance. The key type is **ECC256**, and MD algorithm is **SHA256**.
17
182. Use [OH_CryptoVerify_Init](../../reference/apis-crypto-architecture-kit/_crypto_signature_api.md#oh_cryptoverify_init) to initialize the **Verify** instance by using the public key (**OH_CryptoPubKey**).
19
203. Use [OH_CryptoVerify_Update](../../reference/apis-crypto-architecture-kit/_crypto_signature_api.md#oh_cryptoverify_update) to pass in the data to be verified.
21   Currently, the amount of data to be passed in by a single **OH_CryptoVerify_Update** is not limited. You can determine how to pass in data based on the data volume. If a small amount of data is to be verified, you can call **OH_CryptoVerify_Final** immediately after **OH_CryptoVerify_Init()**.
22
234. Use [OH_CryptoVerify_Final](../../reference/apis-crypto-architecture-kit/_crypto_signature_api.md#oh_cryptoverify_final) to verify the signature.
24
25**Example**
26
27```c++
28#include "CryptoArchitectureKit/crypto_common.h"
29#include "CryptoArchitectureKit/crypto_signature.h"
30#include "CryptoArchitectureKit/crypto_asym_key.h"
31
32static bool doTestEcdsaSignature()
33{
34   OH_CryptoAsymKeyGenerator *keyCtx = nullptr;
35   OH_CryptoKeyPair *keyPair = nullptr;
36   OH_CryptoVerify *verify = nullptr;
37
38   uint8_t plainText[] = {
39      0xe4, 0x2b, 0xcc, 0x08, 0x11, 0x79, 0x16, 0x1b, 0x35, 0x7f, 0xb3, 0xaf, 0x40, 0x3b, 0x3f, 0x7c
40   };
41   Crypto_DataBlob msgBlob = {
42      .data = reinterpret_cast<uint8_t *>(plainText),
43      .len = sizeof(plainText)
44   };
45
46   uint8_t pubKeyText[] = {
47      0x30, 0x39, 0x30, 0x13, 0x06, 0x07, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x02, 0x01, 0x06, 0x08, 0x2a,
48      0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07, 0x03, 0x22, 0x00, 0x03, 0x4d, 0xe4, 0xbb, 0x11, 0x10,
49      0x1a, 0xd2, 0x05, 0x74, 0xf1, 0x0b, 0xb4, 0x75, 0x57, 0xf4, 0x3e, 0x55, 0x14, 0x17, 0x05, 0x4a,
50      0xb2, 0xfb, 0x8c, 0x84, 0x64, 0x38, 0x02, 0xa0, 0x2a, 0xa6, 0xf0
51   };
52
53   Crypto_DataBlob keyBlob = {
54      .data = reinterpret_cast<uint8_t *>(pubKeyText),
55      .len = sizeof(pubKeyText)
56   };
57
58   uint8_t signText[] = {
59      0x30, 0x44, 0x02, 0x20, 0x21, 0x89, 0x99, 0xb1, 0x56, 0x4e, 0x3a, 0x2c, 0x16, 0x08, 0xb5, 0x8a,
60      0x06, 0x6f, 0x67, 0x47, 0x1b, 0x04, 0x18, 0x7d, 0x53, 0x2d, 0xba, 0x00, 0x38, 0xd9, 0xe3, 0xe7,
61      0x8c, 0xcf, 0x76, 0x83, 0x02, 0x20, 0x13, 0x54, 0x84, 0x9d, 0x73, 0x40, 0xc3, 0x92, 0x66, 0xdc,
62      0x3e, 0xc9, 0xf1, 0x4c, 0x33, 0x84, 0x2a, 0x76, 0xaf, 0xc6, 0x61, 0x84, 0x5c, 0xae, 0x4b, 0x0d,
63      0x3c, 0xb0, 0xc8, 0x04, 0x89, 0x71
64   };
65
66   Crypto_DataBlob signBlob = {
67      .data = reinterpret_cast<uint8_t *>(signText),
68      .len = sizeof(signText)
69   };
70
71   OH_Crypto_ErrCode ret = CRYPTO_SUCCESS;
72   // keypair
73   ret = OH_CryptoAsymKeyGenerator_Create((const char *)"ECC256", &keyCtx);
74   if (ret != CRYPTO_SUCCESS) {
75      return false;
76   }
77   ret = OH_CryptoAsymKeyGenerator_Convert(keyCtx, CRYPTO_DER, &keyBlob, nullptr, &keyPair);
78   if (ret != CRYPTO_SUCCESS) {
79      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
80      return false;
81   }
82   OH_CryptoPubKey *pubKey = OH_CryptoKeyPair_GetPubKey(keyPair);
83   // verify
84   ret = OH_CryptoVerify_Create((const char *)"ECC256|SHA256", &verify);
85   if (ret != CRYPTO_SUCCESS) {
86      OH_CryptoVerify_Destroy(verify);
87      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
88      return false;
89   }
90   ret = OH_CryptoVerify_Init(verify, pubKey);
91   if (ret != CRYPTO_SUCCESS) {
92      OH_CryptoVerify_Destroy(verify);
93      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
94      return false;
95   }
96   bool res = OH_CryptoVerify_Final(verify, &msgBlob, &signBlob);
97   if (res != true) {
98      OH_CryptoVerify_Destroy(verify);
99      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
100      return false;
101   }
102
103   OH_CryptoVerify_Destroy(verify);
104   OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
105   OH_CryptoKeyPair_Destroy(keyPair);
106   return res;
107}
108```
109