使用RSA密钥对（PKCS1模式）签名恢复(C/C++)
对应的算法规格请查看验签算法规格：RSA。
在CMake脚本中链接相关动态库
target_link_libraries(entry PUBLIC libohcrypto.so)
开发步骤
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调用OH_CryptoVerify_Create，指定字符串参数'RSA1024|PKCS1|SHA256|Recover'，与签名的Sign实例保持一致。创建Verify实例，用于完成验签操作。
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调用OH_CryptoVerify_Init，使用公钥（OH_CryptoPubKey）初始化Verify实例。
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调用OH_CryptoVerify_Recover，对数据进行签名恢复。
#include "signing_signature_verification.h"
OH_Crypto_ErrCode DoTestRsaSignatureRecover()
{
OH_CryptoAsymKeyGenerator *keyCtx = nullptr;
OH_CryptoKeyPair *keyPair = nullptr;
OH_CryptoVerify *verify = nullptr;
uint8_t plainText[] = {0xc4, 0xa5, 0xe5, 0x45, 0xee, 0x71, 0x5e, 0x3b, 0x24, 0x1d, 0x7e,
0x62, 0xd6, 0x6b, 0xab, 0x98, 0x88, 0x0f, 0xaf, 0x1e, 0x96, 0xa0,
0x6c, 0xa5, 0x0d, 0x29, 0xfd, 0xcc, 0xef, 0xf6, 0x2b, 0x92};
Crypto_DataBlob msgBlob = {.data = reinterpret_cast<uint8_t *>(plainText), .len = sizeof(plainText)};
uint8_t pubKeyText[] = {
0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x42, 0x45, 0x47, 0x49, 0x4e, 0x20, 0x52, 0x53, 0x41, 0x20, 0x50, 0x55, 0x42,
0x4c, 0x49, 0x43, 0x20, 0x4b, 0x45, 0x59, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x0a, 0x4d, 0x49, 0x47, 0x4a, 0x41,
0x6f, 0x47, 0x42, 0x41, 0x4b, 0x72, 0x55, 0x74, 0x74, 0x64, 0x76, 0x73, 0x2b, 0x62, 0x6e, 0x4d, 0x2f, 0x6f,
0x4e, 0x75, 0x39, 0x45, 0x42, 0x78, 0x35, 0x64, 0x49, 0x6d, 0x61, 0x70, 0x52, 0x67, 0x4d, 0x6a, 0x4b, 0x41,
0x38, 0x51, 0x48, 0x4b, 0x61, 0x75, 0x2f, 0x6c, 0x58, 0x50, 0x50, 0x68, 0x76, 0x38, 0x30, 0x69, 0x59, 0x4c,
0x46, 0x2b, 0x79, 0x35, 0x35, 0x0a, 0x6d, 0x42, 0x2f, 0x38, 0x2b, 0x4b, 0x68, 0x34, 0x34, 0x43, 0x2b, 0x5a,
0x76, 0x6f, 0x78, 0x5a, 0x66, 0x38, 0x78, 0x34, 0x6e, 0x78, 0x6f, 0x71, 0x76, 0x4f, 0x6f, 0x73, 0x32, 0x44,
0x55, 0x69, 0x51, 0x44, 0x4f, 0x4a, 0x35, 0x63, 0x57, 0x68, 0x5a, 0x62, 0x4d, 0x71, 0x4d, 0x42, 0x71, 0x62,
0x39, 0x30, 0x4e, 0x39, 0x63, 0x2f, 0x44, 0x51, 0x67, 0x39, 0x34, 0x63, 0x52, 0x7a, 0x35, 0x66, 0x0a, 0x68,
0x55, 0x66, 0x6d, 0x66, 0x6d, 0x54, 0x41, 0x46, 0x6a, 0x5a, 0x53, 0x33, 0x78, 0x6c, 0x78, 0x77, 0x6e, 0x50,
0x77, 0x66, 0x66, 0x39, 0x71, 0x44, 0x79, 0x4c, 0x63, 0x5a, 0x55, 0x6b, 0x6e, 0x64, 0x43, 0x30, 0x50, 0x77,
0x72, 0x6c, 0x38, 0x72, 0x70, 0x4b, 0x7a, 0x50, 0x47, 0x63, 0x71, 0x4e, 0x67, 0x33, 0x5a, 0x41, 0x67, 0x4d,
0x42, 0x41, 0x41, 0x45, 0x3d, 0x0a, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x45, 0x4e, 0x44, 0x20, 0x52, 0x53, 0x41,
0x20, 0x50, 0x55, 0x42, 0x4c, 0x49, 0x43, 0x20, 0x4b, 0x45, 0x59, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x0a,
};
Crypto_DataBlob keyBlob = {.data = reinterpret_cast<uint8_t *>(pubKeyText), .len = sizeof(pubKeyText)};
uint8_t signText[] = {
0x1f, 0xe3, 0xcf, 0x8d, 0x94, 0xb4, 0xa0, 0x9e, 0xf1, 0x0c, 0x38, 0x59, 0xcb, 0x5b, 0x89, 0xc9,
0x66, 0x8b, 0xfd, 0x8d, 0x1e, 0x37, 0xfa, 0x5e, 0x1b, 0xb1, 0x51, 0x07, 0xf1, 0xb0, 0x7d, 0x18,
0x2d, 0x82, 0x2a, 0x04, 0xa4, 0x4e, 0x94, 0x7e, 0x76, 0xb8, 0xa4, 0x78, 0x90, 0x2f, 0x43, 0x1d,
0x95, 0x80, 0xd7, 0xb3, 0x46, 0x4d, 0x58, 0x4b, 0xcd, 0x1f, 0x1d, 0xb3, 0x1f, 0x6b, 0x15, 0xd8,
0x33, 0x51, 0x1d, 0x36, 0x12, 0x39, 0x92, 0xb4, 0x4d, 0xe2, 0x89, 0x26, 0x01, 0xe9, 0x1f, 0xc0,
0x9c, 0x7c, 0xd8, 0xeb, 0x47, 0xff, 0xfb, 0x5d, 0x98, 0x9a, 0x02, 0x6a, 0x16, 0x37, 0xb1, 0xf5,
0x08, 0x4d, 0xd7, 0xa0, 0xf2, 0x9e, 0xbe, 0x4b, 0x54, 0x77, 0x94, 0x95, 0x4b, 0x97, 0x10, 0x22,
0x49, 0xa5, 0x2e, 0x05, 0x86, 0xfd, 0x6f, 0x9a, 0x40, 0xe6, 0x43, 0xab, 0xc5, 0xbc, 0xac, 0x21,
};
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 *)"RSA2048", &keyCtx);
if (ret != CRYPTO_SUCCESS) {
return ret;
}
ret = OH_CryptoAsymKeyGenerator_Convert(keyCtx, CRYPTO_PEM, &keyBlob, nullptr, &keyPair);
if (ret != CRYPTO_SUCCESS) {
OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
return ret;
}
OH_CryptoPubKey *pubKey = OH_CryptoKeyPair_GetPubKey(keyPair);
// verify
ret = OH_CryptoVerify_Create((const char *)"RSA1024|PKCS1|SHA256|Recover", &verify);
if (ret != CRYPTO_SUCCESS) {
OH_CryptoVerify_Destroy(verify);
OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
return ret;
}
ret = OH_CryptoVerify_Init(verify, pubKey);
if (ret != CRYPTO_SUCCESS) {
OH_CryptoVerify_Destroy(verify);
OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
return ret;
}
Crypto_DataBlob rawSignData = {.data = nullptr, .len = 0};
ret = OH_CryptoVerify_Recover(verify, (Crypto_DataBlob *)&signBlob, &rawSignData);
if (ret != CRYPTO_SUCCESS) {
OH_CryptoVerify_Destroy(verify);
OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
return ret;
}
OH_CryptoVerify_Destroy(verify);
OH_CryptoAsymKeyGenerator_Destroy(keyCtx);
OH_CryptoKeyPair_Destroy(keyPair);
return ret;
}