harmony 鸿蒙Signing and Signature Verification with an ECDSA Key Pair (C/C++)

2025-06-12
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Signing and Signature Verification with an ECDSA Key Pair (C/C++)

For details about the algorithm specifications, see ECDSA.

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 ‘ECC256|SHA256’ to create a Verify instance. The key type is ECC256, and MD algorithm is SHA256.
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 doTestEcdsaSignature()
{
   OH_CryptoAsymKeyGenerator *keyCtx = nullptr;
   OH_CryptoKeyPair *keyPair = nullptr;
   OH_CryptoVerify *verify = nullptr;

   uint8_t plainText[] = {
      0xe4, 0x2b, 0xcc, 0x08, 0x11, 0x79, 0x16, 0x1b, 0x35, 0x7f, 0xb3, 0xaf, 0x40, 0x3b, 0x3f, 0x7c
   }; // Data to be verified, for reference only.
   Crypto_DataBlob msgBlob = {
      .data = reinterpret_cast<uint8_t *>(plainText),
      .len = sizeof(plainText)
   };

   uint8_t pubKeyText[] = {
      0x30, 0x39, 0x30, 0x13, 0x06, 0x07, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x02, 0x01, 0x06, 0x08, 0x2a,
      0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07, 0x03, 0x22, 0x00, 0x03, 0x4d, 0xe4, 0xbb, 0x11, 0x10,
      0x1a, 0xd2, 0x05, 0x74, 0xf1, 0x0b, 0xb4, 0x75, 0x57, 0xf4, 0x3e, 0x55, 0x14, 0x17, 0x05, 0x4a,
      0xb2, 0xfb, 0x8c, 0x84, 0x64, 0x38, 0x02, 0xa0, 0x2a, 0xa6, 0xf0
   }; // Public key in DER format, for reference only.

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

   uint8_t signText[] = {
      0x30, 0x44, 0x02, 0x20, 0x21, 0x89, 0x99, 0xb1, 0x56, 0x4e, 0x3a, 0x2c, 0x16, 0x08, 0xb5, 0x8a,
      0x06, 0x6f, 0x67, 0x47, 0x1b, 0x04, 0x18, 0x7d, 0x53, 0x2d, 0xba, 0x00, 0x38, 0xd9, 0xe3, 0xe7,
      0x8c, 0xcf, 0x76, 0x83, 0x02, 0x20, 0x13, 0x54, 0x84, 0x9d, 0x73, 0x40, 0xc3, 0x92, 0x66, 0xdc,
      0x3e, 0xc9, 0xf1, 0x4c, 0x33, 0x84, 0x2a, 0x76, 0xaf, 0xc6, 0x61, 0x84, 0x5c, 0xae, 0x4b, 0x0d,
      0x3c, 0xb0, 0xc8, 0x04, 0x89, 0x71
   }; // Signature data, for reference only.

   Crypto_DataBlob signBlob = {
      .data = reinterpret_cast<uint8_t *>(signText),
      .len = sizeof(signText)
   };
   
   OH_Crypto_ErrCode ret = CRYPTO_SUCCESS;

   ret = OH_CryptoAsymKeyGenerator_Create((const char *)"ECC256", &keyCtx);
   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); // Obtain the public key object.
   // verify
   ret = OH_CryptoVerify_Create((const char *)"ECC256|SHA256", &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);
   if (ret != CRYPTO_SUCCESS) {
      OH_CryptoVerify_Destroy(verify);
      OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
      return false;
   }
   bool res = OH_CryptoVerify_Final(verify, &msgBlob, &signBlob);
   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;
}