1# 使用RSA密钥对（PKCS1模式）验签(C/C++) 2 3对应的算法规格请查看[验签算法规格：RSA](crypto-sign-sig-verify-overview.md#rsa)。 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'RSA1024|PKCS1|SHA256'，与签名的Sign实例保持一致。创建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。 17 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。 18 19 - 当待签名的数据较短时，可以在init完成后直接调用[OH_CryptoVerify_Final](../../reference/apis-crypto-architecture-kit/_crypto_signature_api.md#oh_cryptoverify_final)。 20 - 当数据量较大时，可以多次调用update，即[分段验签](crypto-rsa-sign-sig-verify-pkcs1-by-segment-ndk.md)。 21 224. 调用[OH_CryptoVerify_Final](../../reference/apis-crypto-architecture-kit/_crypto_signature_api.md#oh_cryptoverify_final)，对数据进行验签。 23 24- 示例： 25 26```c++ 27#include "CryptoArchitectureKit/crypto_common.h" 28#include "CryptoArchitectureKit/crypto_asym_key.h" 29#include "CryptoArchitectureKit/crypto_signature.h" 30 31static bool doTestRsaSignature() 32{ 33 OH_CryptoAsymKeyGenerator *keyCtx = nullptr; 34 OH_CryptoKeyPair *keyPair = nullptr; 35 OH_CryptoVerify *verify = nullptr; 36 37 uint8_t plainText[] = { 38 0x43, 0x31, 0x7d, 0xb5, 0x85, 0x2e, 0xd4, 0xef, 0x08, 0x7a, 0x17, 0x96, 0xbc, 0x7c, 0x8f, 0x80, 39 0x8c, 0xa7, 0x63, 0x7f, 0x26, 0x89, 0x8f, 0xf0, 0xfa, 0xa7, 0x51, 0xbd, 0x9c, 0x69, 0x17, 0xf3, 40 0xd1, 0xb5, 0xc7, 0x12, 0xbf, 0xcf, 0x91, 0x25, 0x82, 0x23, 0x6b, 0xd6, 0x64, 0x52, 0x77, 0x93, 41 0x01, 0x9d, 0x70, 0xa3, 0xf4, 0x92, 0x16, 0xec, 0x3f, 0xa7, 0x3c, 0x83, 0x8d, 0x40, 0x41, 0xfc, 42 }; // 待验证数据，仅供参考。 43 Crypto_DataBlob msgBlob = { 44 .data = reinterpret_cast<uint8_t *>(plainText), 45 .len = sizeof(plainText) 46 }; 47 48 uint8_t pubKeyText[] = { 49 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x42, 0x45, 0x47, 0x49, 0x4e, 0x20, 0x52, 0x53, 0x41, 0x20, 0x50, 50 0x55, 0x42, 0x4c, 0x49, 0x43, 0x20, 0x4b, 0x45, 0x59, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x0a, 0x4d, 51 0x49, 0x47, 0x4a, 0x41, 0x6f, 0x47, 0x42, 0x41, 0x4d, 0x78, 0x63, 0x44, 0x4d, 0x6f, 0x61, 0x59, 52 0x52, 0x58, 0x6f, 0x78, 0x65, 0x69, 0x33, 0x49, 0x6d, 0x33, 0x33, 0x78, 0x4a, 0x76, 0x61, 0x73, 53 0x63, 0x43, 0x62, 0x77, 0x31, 0x6f, 0x73, 0x63, 0x32, 0x56, 0x56, 0x69, 0x47, 0x6a, 0x56, 0x47, 54 0x47, 0x4a, 0x37, 0x6c, 0x75, 0x4e, 0x41, 0x58, 0x6b, 0x6a, 0x73, 0x56, 0x46, 0x64, 0x35, 0x0a, 55 0x58, 0x37, 0x4c, 0x4d, 0x6c, 0x46, 0x34, 0x63, 0x35, 0x5a, 0x75, 0x59, 0x2f, 0x61, 0x69, 0x57, 56 0x77, 0x70, 0x54, 0x69, 0x63, 0x62, 0x67, 0x49, 0x33, 0x43, 0x66, 0x50, 0x6f, 0x32, 0x6a, 0x6c, 57 0x52, 0x74, 0x67, 0x41, 0x46, 0x6b, 0x44, 0x71, 0x7a, 0x4b, 0x53, 0x46, 0x62, 0x46, 0x47, 0x51, 58 0x6b, 0x43, 0x6e, 0x64, 0x63, 0x2b, 0x54, 0x59, 0x6b, 0x5a, 0x42, 0x32, 0x70, 0x45, 0x6f, 0x72, 59 0x0a, 0x7a, 0x73, 0x61, 0x56, 0x58, 0x77, 0x5a, 0x47, 0x45, 0x34, 0x41, 0x43, 0x70, 0x59, 0x35, 60 0x79, 0x65, 0x66, 0x49, 0x44, 0x6c, 0x45, 0x57, 0x49, 0x51, 0x4f, 0x6a, 0x59, 0x4b, 0x2f, 0x6c, 61 0x58, 0x71, 0x7a, 0x48, 0x47, 0x69, 0x4f, 0x69, 0x32, 0x75, 0x4a, 0x45, 0x75, 0x44, 0x43, 0x50, 62 0x6a, 0x51, 0x64, 0x6a, 0x54, 0x41, 0x67, 0x4d, 0x42, 0x41, 0x41, 0x45, 0x3d, 0x0a, 0x2d, 0x2d, 63 0x2d, 0x2d, 0x2d, 0x45, 0x4e, 0x44, 0x20, 0x52, 0x53, 0x41, 0x20, 0x50, 0x55, 0x42, 0x4c, 0x49, 64 0x43, 0x20, 0x4b, 0x45, 0x59, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x0a, 65 }; // 公钥DER编码数据，仅供参考。 66 67 Crypto_DataBlob keyBlob = { 68 .data = reinterpret_cast<uint8_t *>(pubKeyText), 69 .len = sizeof(pubKeyText) 70 }; 71 72 uint8_t signText[] = { 73 0x68, 0x2f, 0x3b, 0xe6, 0xa6, 0x5c, 0xb8, 0x60, 0xd4, 0xe1, 0x64, 0xa7, 0xd8, 0x0c, 0x9c, 0x89, 74 0x39, 0xb4, 0xf0, 0xb7, 0xad, 0xb5, 0x8a, 0x71, 0x04, 0xf1, 0xa5, 0x63, 0xdd, 0x32, 0x6a, 0x44, 75 0xeb, 0xff, 0xb7, 0xe6, 0x85, 0xe5, 0xa5, 0x55, 0x5d, 0x5b, 0x28, 0x53, 0x63, 0xe4, 0xb3, 0xb9, 76 0xa8, 0x70, 0xc8, 0x8f, 0xcd, 0x21, 0x8d, 0xe6, 0x1f, 0xe5, 0x78, 0x34, 0xd3, 0x45, 0x0c, 0x9c, 77 0x7a, 0x22, 0x1b, 0x63, 0x55, 0xca, 0x14, 0xa5, 0x0c, 0x7a, 0x40, 0x8e, 0xa1, 0x14, 0x78, 0xa1, 78 0xf1, 0x36, 0x78, 0xbd, 0xba, 0x37, 0x3b, 0x5b, 0xb0, 0x8e, 0xb3, 0x4a, 0x9b, 0x1b, 0x0c, 0xfa, 79 0xfa, 0xc7, 0x9f, 0xb1, 0x35, 0x48, 0x82, 0x73, 0xf8, 0x6b, 0xd4, 0x76, 0x33, 0x5c, 0xed, 0x9c, 80 0xd8, 0x4b, 0xc9, 0x92, 0xa0, 0x3f, 0x6e, 0xba, 0x78, 0x2e, 0x80, 0x78, 0x1e, 0x74, 0xa0, 0x47, 81 }; // 签名数据，仅供参考。 82 83 Crypto_DataBlob signBlob = { 84 .data = reinterpret_cast<uint8_t *>(signText), 85 .len = sizeof(signText) 86 }; 87 88 // keypair 89 OH_Crypto_ErrCode ret = CRYPTO_SUCCESS; 90 ret = OH_CryptoAsymKeyGenerator_Create((const char *)"RSA2048", &keyCtx); // 创建非对称密钥生成器。 91 if (ret != CRYPTO_SUCCESS) { 92 return false; 93 } 94 ret = OH_CryptoAsymKeyGenerator_Convert(keyCtx, CRYPTO_PEM, &keyBlob, nullptr, &keyPair); // 将PEM格式的公钥编码数据转换为OH_CryptoKeyPair。 95 if (ret != CRYPTO_SUCCESS) { 96 OH_CryptoAsymKeyGenerator_Destroy(keyCtx); 97 return false; 98 } 99 OH_CryptoPubKey *pubKey = OH_CryptoKeyPair_GetPubKey(keyPair); // 获取公钥。 100 // verify 101 ret = OH_CryptoVerify_Create((const char *)"RSA1024|PKCS1|SHA256", &verify); // 创建Verify实例。 102 if (ret != CRYPTO_SUCCESS) { 103 OH_CryptoVerify_Destroy(verify); 104 OH_CryptoAsymKeyGenerator_Destroy(keyCtx); 105 return false; 106 } 107 ret = OH_CryptoVerify_Init(verify, pubKey); // 使用公钥初始化Verify实例。 108 if (ret != CRYPTO_SUCCESS) { 109 OH_CryptoVerify_Destroy(verify); 110 OH_CryptoAsymKeyGenerator_Destroy(keyCtx); 111 return false; 112 } 113 bool res = OH_CryptoVerify_Final(verify, &msgBlob, &signBlob); // 对数据进行验签。 114 if (res != true) { 115 OH_CryptoVerify_Destroy(verify); 116 OH_CryptoAsymKeyGenerator_Destroy(keyCtx); 117 return false; 118 } 119 120 OH_CryptoVerify_Destroy(verify); 121 OH_CryptoAsymKeyGenerator_Destroy(keyCtx); 122 OH_CryptoKeyPair_Destroy(keyPair); 123 return res; 124} 125``` 126