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1# Signing and Signature Verification by Segment with an RSA Key Pair (PKCS1 Mode) (C/C++)
2
3
4For details about the algorithm specifications, see [RSA](crypto-sign-sig-verify-overview.md#rsa).
5
6
7## Adding the Dynamic Library in the CMake Script
8```txt
9target_link_libraries(entry PUBLIC libohcrypto.so)
10```
11
12## How to Develop
13
14
151. Call [OH_CryptoVerify_Create](../../reference/apis-crypto-architecture-kit/_crypto_signature_api.md#oh_cryptoverify_create) with the string parameter **'RSA1024|PKCS1|SHA256'** to create a **Verify** instance. The string parameter must be the same as that used to create the **Sign** instance.
16
172. Call [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**).
18
193. Call [OH_CryptoVerify_Update](../../reference/apis-crypto-architecture-kit/_crypto_signature_api.md#oh_cryptoverify_update) to pass in the data to be verified.
20
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. Call [OH_CryptoVerify_Final](../../reference/apis-crypto-architecture-kit/_crypto_signature_api.md#oh_cryptoverify_final) to verify the signature.
24
25
26**Example**
27
28```c++
29#include "CryptoArchitectureKit/crypto_common.h"
30#include "CryptoArchitectureKit/crypto_asym_key.h"
31#include "CryptoArchitectureKit/crypto_signature.h"
32
33static bool doTestRsaSignatureSeg()
34{
35   OH_CryptoAsymKeyGenerator *keyCtx = nullptr;
36   OH_CryptoKeyPair *keyPair = nullptr;
37   OH_CryptoVerify *verify = nullptr;
38
39   uint8_t plainText[] = {
40      0x43, 0x31, 0x7d, 0xb5, 0x85, 0x2e, 0xd4, 0xef, 0x08, 0x7a, 0x17, 0x96, 0xbc, 0x7c, 0x8f, 0x80,
41      0x8c, 0xa7, 0x63, 0x7f, 0x26, 0x89, 0x8f, 0xf0, 0xfa, 0xa7, 0x51, 0xbd, 0x9c, 0x69, 0x17, 0xf3,
42      0xd1, 0xb5, 0xc7, 0x12, 0xbf, 0xcf, 0x91, 0x25, 0x82, 0x23, 0x6b, 0xd6, 0x64, 0x52, 0x77, 0x93,
43      0x01, 0x9d, 0x70, 0xa3, 0xf4, 0x92, 0x16, 0xec, 0x3f, 0xa7, 0x3c, 0x83, 0x8d, 0x40, 0x41, 0xfc,
44   };
45   Crypto_DataBlob msgBlob = {
46      .data = reinterpret_cast<uint8_t *>(plainText),
47      .len = sizeof(plainText)
48   };
49
50   uint8_t pubKeyText[] = {
51      0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x42, 0x45, 0x47, 0x49, 0x4e, 0x20, 0x52, 0x53, 0x41, 0x20, 0x50,
52      0x55, 0x42, 0x4c, 0x49, 0x43, 0x20, 0x4b, 0x45, 0x59, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x0a, 0x4d,
53      0x49, 0x47, 0x4a, 0x41, 0x6f, 0x47, 0x42, 0x41, 0x4d, 0x78, 0x63, 0x44, 0x4d, 0x6f, 0x61, 0x59,
54      0x52, 0x58, 0x6f, 0x78, 0x65, 0x69, 0x33, 0x49, 0x6d, 0x33, 0x33, 0x78, 0x4a, 0x76, 0x61, 0x73,
55      0x63, 0x43, 0x62, 0x77, 0x31, 0x6f, 0x73, 0x63, 0x32, 0x56, 0x56, 0x69, 0x47, 0x6a, 0x56, 0x47,
56      0x47, 0x4a, 0x37, 0x6c, 0x75, 0x4e, 0x41, 0x58, 0x6b, 0x6a, 0x73, 0x56, 0x46, 0x64, 0x35, 0x0a,
57      0x58, 0x37, 0x4c, 0x4d, 0x6c, 0x46, 0x34, 0x63, 0x35, 0x5a, 0x75, 0x59, 0x2f, 0x61, 0x69, 0x57,
58      0x77, 0x70, 0x54, 0x69, 0x63, 0x62, 0x67, 0x49, 0x33, 0x43, 0x66, 0x50, 0x6f, 0x32, 0x6a, 0x6c,
59      0x52, 0x74, 0x67, 0x41, 0x46, 0x6b, 0x44, 0x71, 0x7a, 0x4b, 0x53, 0x46, 0x62, 0x46, 0x47, 0x51,
60      0x6b, 0x43, 0x6e, 0x64, 0x63, 0x2b, 0x54, 0x59, 0x6b, 0x5a, 0x42, 0x32, 0x70, 0x45, 0x6f, 0x72,
61      0x0a, 0x7a, 0x73, 0x61, 0x56, 0x58, 0x77, 0x5a, 0x47, 0x45, 0x34, 0x41, 0x43, 0x70, 0x59, 0x35,
62      0x79, 0x65, 0x66, 0x49, 0x44, 0x6c, 0x45, 0x57, 0x49, 0x51, 0x4f, 0x6a, 0x59, 0x4b, 0x2f, 0x6c,
63      0x58, 0x71, 0x7a, 0x48, 0x47, 0x69, 0x4f, 0x69, 0x32, 0x75, 0x4a, 0x45, 0x75, 0x44, 0x43, 0x50,
64      0x6a, 0x51, 0x64, 0x6a, 0x54, 0x41, 0x67, 0x4d, 0x42, 0x41, 0x41, 0x45, 0x3d, 0x0a, 0x2d, 0x2d,
65      0x2d, 0x2d, 0x2d, 0x45, 0x4e, 0x44, 0x20, 0x52, 0x53, 0x41, 0x20, 0x50, 0x55, 0x42, 0x4c, 0x49,
66      0x43, 0x20, 0x4b, 0x45, 0x59, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x0a,
67   };
68
69   Crypto_DataBlob keyBlob = {
70      .data = reinterpret_cast<uint8_t *>(pubKeyText),
71      .len = sizeof(pubKeyText)
72   };
73
74   uint8_t signText[] = {
75      0x68, 0x2f, 0x3b, 0xe6, 0xa6, 0x5c, 0xb8, 0x60, 0xd4, 0xe1, 0x64, 0xa7, 0xd8, 0x0c, 0x9c, 0x89,
76      0x39, 0xb4, 0xf0, 0xb7, 0xad, 0xb5, 0x8a, 0x71, 0x04, 0xf1, 0xa5, 0x63, 0xdd, 0x32, 0x6a, 0x44,
77      0xeb, 0xff, 0xb7, 0xe6, 0x85, 0xe5, 0xa5, 0x55, 0x5d, 0x5b, 0x28, 0x53, 0x63, 0xe4, 0xb3, 0xb9,
78      0xa8, 0x70, 0xc8, 0x8f, 0xcd, 0x21, 0x8d, 0xe6, 0x1f, 0xe5, 0x78, 0x34, 0xd3, 0x45, 0x0c, 0x9c,
79      0x7a, 0x22, 0x1b, 0x63, 0x55, 0xca, 0x14, 0xa5, 0x0c, 0x7a, 0x40, 0x8e, 0xa1, 0x14, 0x78, 0xa1,
80      0xf1, 0x36, 0x78, 0xbd, 0xba, 0x37, 0x3b, 0x5b, 0xb0, 0x8e, 0xb3, 0x4a, 0x9b, 0x1b, 0x0c, 0xfa,
81      0xfa, 0xc7, 0x9f, 0xb1, 0x35, 0x48, 0x82, 0x73, 0xf8, 0x6b, 0xd4, 0x76, 0x33, 0x5c, 0xed, 0x9c,
82      0xd8, 0x4b, 0xc9, 0x92, 0xa0, 0x3f, 0x6e, 0xba, 0x78, 0x2e, 0x80, 0x78, 0x1e, 0x74, 0xa0, 0x47,
83   };
84
85   Crypto_DataBlob signBlob = {
86      .data = reinterpret_cast<uint8_t *>(signText),
87      .len = sizeof(signText)
88   };
89
90   // keypair
91   OH_Crypto_ErrCode ret = CRYPTO_SUCCESS;
92   ret = OH_CryptoAsymKeyGenerator_Create((const char *)"RSA2048", &keyCtx);
93   if (ret != CRYPTO_SUCCESS) {
94      return false;
95   }
96   ret = OH_CryptoAsymKeyGenerator_Convert(keyCtx, CRYPTO_PEM, &keyBlob, nullptr, &keyPair);
97   if (ret != CRYPTO_SUCCESS) {
98      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
99      return false;
100   }
101   OH_CryptoPubKey *pubKey = OH_CryptoKeyPair_GetPubKey(keyPair);
102   // verify
103   ret = OH_CryptoVerify_Create((const char *)"RSA1024|PKCS1|SHA256", &verify);
104   if (ret != CRYPTO_SUCCESS) {
105      OH_CryptoVerify_Destroy(verify);
106      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
107      return false;
108   }
109   int blockSize = 20;
110   int cnt_s = 64 / blockSize;
111   int rem_s = 64 % blockSize;
112   ret = OH_CryptoVerify_Init(verify, pubKey);
113   if (ret != CRYPTO_SUCCESS) {
114      OH_CryptoVerify_Destroy(verify);
115      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
116      return false;
117   }
118   for (int i = 0; i < cnt_s; i++) {
119      msgBlob.len = blockSize;
120      ret = OH_CryptoVerify_Update(verify, (Crypto_DataBlob *)&msgBlob);
121      if (ret != CRYPTO_SUCCESS) {
122         OH_CryptoVerify_Destroy(verify);
123         OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
124         return false;
125      }
126      msgBlob.data += blockSize;
127   }
128   bool res = false;
129   if (rem_s > 0) {
130      msgBlob.len = rem_s;
131      res = OH_CryptoVerify_Final(verify, (Crypto_DataBlob *)&msgBlob, (Crypto_DataBlob *)&signBlob);
132      if (res != true) {
133         OH_CryptoVerify_Destroy(verify);
134         OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
135         return false;
136      }
137   }
138
139   msgBlob.data -=  64 - rem_s;
140   msgBlob.len = 64;
141
142   OH_CryptoVerify_Destroy(verify);
143   OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
144   OH_CryptoKeyPair_Destroy(keyPair);
145   return res;
146}
147```
148