harmony 鸿蒙Signature Verification with an SM2 Key Pair (C/C++)

2025-06-12
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Signature Verification with an SM2 Key Pair (C/C++)

For details about the algorithm specifications, see SM2.

Adding the Dynamic Library in the CMake Script

target_link_libraries(entry PUBLIC libohcrypto.so)

How to Develop

Call OH_CryptoVerify_Create with the string parameter ‘SM2_256|SM3’ to create a Verify instance. The key type is SM2_256, and MD algorithm is SM3.
Call OH_CryptoVerify_Init to initialize the Verify instance by using the public key (OH_CryptoPubKey).
Call OH_CryptoVerify_Update to pass in the data to be verified.
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().
Call OH_CryptoVerify_Final to verify the signature. Example

#include "CryptoArchitectureKit/crypto_common.h"
#include "CryptoArchitectureKit/crypto_signature.h"
#include "CryptoArchitectureKit/crypto_asym_key.h"

static bool doTestSm2Signature()
{
   OH_CryptoAsymKeyGenerator *keyCtx = nullptr;
   OH_CryptoKeyPair *keyPair = nullptr;
   OH_CryptoVerify *verify = nullptr;

   uint8_t plainText[] = {
      0x96, 0x46, 0x2e, 0xde, 0x3f, 0x47, 0xbf, 0xd6, 0x87, 0x48, 0x36, 0x1d, 0x75, 0x35, 0xbd, 0xbc,
      0x6b, 0x06, 0xe8, 0xb3, 0x68, 0x91, 0x53, 0xce, 0x76, 0x5d, 0x24, 0xda, 0xdc, 0xc4, 0x9f, 0x94,
   }; // Data to be verified, for reference only.
   Crypto_DataBlob msgBlob = {
      .data = reinterpret_cast<uint8_t *>(plainText),
      .len = sizeof(plainText)
   };

   uint8_t pubKeyText[] = {
      0x30, 0x59, 0x30, 0x13, 0x06, 0x07, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x02, 0x01, 0x06, 0x08, 0x2a,
      0x81, 0x1c, 0xcf, 0x55, 0x01, 0x82, 0x2d, 0x03, 0x42, 0x00, 0x04, 0x80, 0x5b, 0x78, 0x04, 0xd7,
      0xcf, 0xc3, 0x99, 0x63, 0xae, 0x88, 0xcd, 0xfc, 0xd6, 0x18, 0xf4, 0x08, 0xe8, 0xe3, 0x68, 0x47,
      0x4f, 0x44, 0x0e, 0xb2, 0xba, 0x3a, 0xb3, 0x10, 0xf1, 0xc9, 0xd0, 0x84, 0xe2, 0xa4, 0x47, 0xbe,
      0x72, 0xae, 0xf8, 0x6a, 0xeb, 0x6e, 0x10, 0xab, 0x52, 0x6b, 0x6a, 0x58, 0xc6, 0xb5, 0x78, 0xaa,
      0x70, 0xe5, 0x58, 0x20, 0x4e, 0x34, 0x42, 0x77, 0x08, 0x27, 0x11,
   }; // Public key in DER format, for reference only.

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

   uint8_t signText[] = {
      0x30, 0x45, 0x02, 0x21, 0x00, 0xf4, 0xe7, 0x9d, 0x35, 0x33, 0xa6, 0x86, 0x2e, 0x2a, 0x97, 0x72,
      0xc9, 0x46, 0x79, 0x65, 0xca, 0x4a, 0x71, 0x34, 0xca, 0xf7, 0x58, 0xb3, 0x26, 0xa5, 0xdb, 0xfa,
      0x8b, 0xbe, 0xbf, 0x5f, 0x90, 0x02, 0x20, 0x53, 0xb4, 0x23, 0xb1, 0xe2, 0x8f, 0x2f, 0xe9, 0xc8,
      0x22, 0xef, 0xab, 0x9b, 0x13, 0x08, 0x75, 0x8e, 0xb1, 0x9c, 0x59, 0xe5, 0xd6, 0x64, 0x35, 0xf5,
      0xd1, 0xde, 0xfa, 0xfe, 0x80, 0x37, 0x1a,
   }; // Signature data, for reference only.

   Crypto_DataBlob signBlob = {
      .data = reinterpret_cast<uint8_t *>(signText),
      .len = sizeof(signText)
   };
   
   // keypair
   OH_Crypto_ErrCode ret = CRYPTO_SUCCESS;
   ret = OH_CryptoAsymKeyGenerator_Create((const char *)"SM2_256", &keyCtx); // Create an asymmetric key generator.
   if (ret != CRYPTO_SUCCESS) {
      return false;
   }
   ret = OH_CryptoAsymKeyGenerator_Convert(keyCtx, CRYPTO_DER, &keyBlob, nullptr, &keyPair); // Convert the public key in DER format to OH_CryptoKeyPair.
   if (ret != CRYPTO_SUCCESS) {
      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
      return false;
   }
   OH_CryptoPubKey *pubKey = OH_CryptoKeyPair_GetPubKey(keyPair);
   // verify
   ret = OH_CryptoVerify_Create((const char *)"SM2_256|SM3", &verify); // Create a Verify instance.
   if (ret != CRYPTO_SUCCESS) {
      OH_CryptoVerify_Destroy(verify);
      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
      return false;
   }
   ret = OH_CryptoVerify_Init(verify, pubKey); // Use the public key to initialize the Verify instance.
   if (ret != CRYPTO_SUCCESS) {
      OH_CryptoVerify_Destroy(verify);
      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
      return false;
   }
   bool res = OH_CryptoVerify_Final(verify, &msgBlob, &signBlob); // Verify the signature of the data.
   if (res != true) {
      OH_CryptoVerify_Destroy(verify);
      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
      return false;
   }

   OH_CryptoVerify_Destroy(verify);
   OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
   OH_CryptoKeyPair_Destroy(keyPair);
   return res;
}