使用私钥对象获取公钥对象(C/C++)
从API version 23开始，算法库支持从私钥对象中获取公钥对象的操作。
以RSA为例，根据私钥对象获取公钥对象。
在CMake脚本中链接相关动态库
target_link_libraries(entry PUBLIC libohcrypto.so)
对应的算法规格请查看非对称密钥生成和转换规格：RSA。
开发步骤
-
调用OH_CryptoAsymKeyGenerator_Create，指定字符串参数'RSA1024|PRIMES_2'，创建RSA密钥类型为RSA1024、素数个数为2的非对称密钥生成器（OH_CryptoAsymKeyGenerator）。
-
调用OH_CryptoAsymKeyGenerator_Convert，传入私钥数据，生成非对称密钥对象（OH_CryptoKeyPair）。
-
调用OH_CryptoKeyPair_GetPubKey获取公钥对象 (OH_CryptoPubKey)。
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调用OH_CryptoPubKey_Encode获取公钥对象的二进制数据。
-
比较公钥数据与期望值是否相等。
#include "CryptoArchitectureKit/crypto_common.h"
#include "CryptoArchitectureKit/crypto_asym_key.h"
#include <cstring>
#include "file.h"
static OH_Crypto_ErrCode ConvertPrikeyToKeyPair(OH_CryptoAsymKeyGenerator *ctx, OH_CryptoKeyPair **keyPair)
{
uint8_t privData[] = {
0x30, 0x82, 0x01, 0x3c, 0x02, 0x01, 0x00, 0x02, 0x41, 0x00, 0xe4, 0x0c, 0xc1, 0x45, 0x43, 0xff,
0x9f, 0x2c, 0x02, 0x99, 0x11, 0x00, 0xff, 0x45, 0xb0, 0x8e, 0x01, 0xe1, 0x2f, 0x83, 0xf4, 0xe3,
0x28, 0xbe, 0x15, 0x45, 0xd9, 0x7a, 0x31, 0xfb, 0xa5, 0x6b, 0xc2, 0x1a, 0x0e, 0x1e, 0x60, 0xf6,
0xd6, 0xab, 0xdc, 0xb6, 0x72, 0x7e, 0xed, 0x52, 0xd2, 0xc3, 0x46, 0x8a, 0x99, 0x8d, 0xac, 0x50,
0x35, 0x3f, 0x8c, 0x58, 0x5d, 0xdd, 0x9f, 0x0c, 0x04, 0xc1, 0x02, 0x03, 0x01, 0x00, 0x01, 0x02,
0x41, 0x00, 0x84, 0xad, 0x8b, 0x10, 0x72, 0x74, 0x59, 0x35, 0xf0, 0xb8, 0xff, 0x34, 0x96, 0x50,
0x04, 0x5d, 0x4a, 0x68, 0xaa, 0x0d, 0x5a, 0xbf, 0x82, 0xa7, 0xbc, 0x96, 0xab, 0xe5, 0xb5, 0x08,
0xd4, 0x7f, 0x18, 0xfc, 0x24, 0x22, 0x43, 0x8e, 0x52, 0x70, 0x5e, 0x70, 0xaf, 0xbe, 0xdb, 0x0b,
0x86, 0x12, 0xea, 0x51, 0xeb, 0x0f, 0xd4, 0x5a, 0x55, 0xef, 0x21, 0x4b, 0xf5, 0x6e, 0x08, 0x04,
0x7e, 0xb1, 0x02, 0x21, 0x00, 0xf4, 0xf5, 0xe9, 0x8c, 0x5f, 0x15, 0xbd, 0xb0, 0xd3, 0xea, 0x88,
0xe4, 0x5a, 0xd9, 0xde, 0x00, 0xec, 0xaf, 0xa0, 0x74, 0xe2, 0xb4, 0x94, 0x47, 0x12, 0x8d, 0xd6,
0x62, 0x83, 0x90, 0xf6, 0xd5, 0x02, 0x21, 0x00, 0xee, 0x53, 0xbe, 0xa2, 0x8a, 0x17, 0x09, 0xcd,
0x5d, 0xbf, 0xc0, 0x8b, 0x32, 0xc9, 0xbb, 0x65, 0xea, 0x81, 0x04, 0x00, 0x8c, 0x09, 0xfa, 0x9e,
0xc4, 0x8d, 0x2d, 0x96, 0x27, 0xbe, 0x64, 0x3d, 0x02, 0x21, 0x00, 0xcf, 0x08, 0xa0, 0x51, 0x91,
0x73, 0xb0, 0x95, 0x29, 0x26, 0x8a, 0x78, 0x66, 0x08, 0xc9, 0x47, 0x82, 0xc3, 0x95, 0x1b, 0xf5,
0x17, 0xa6, 0x52, 0xc3, 0x6d, 0xb9, 0x8a, 0x1d, 0xa4, 0x81, 0xd9, 0x02, 0x20, 0x12, 0x19, 0x58,
0x03, 0xdd, 0xfa, 0xcb, 0xea, 0xc5, 0xb0, 0xd7, 0x3d, 0x7a, 0xf8, 0xe8, 0xfb, 0x5f, 0x68, 0xb6,
0xd6, 0x17, 0xcc, 0x76, 0x34, 0xf2, 0x76, 0x4a, 0x3c, 0xf9, 0xfd, 0xb2, 0x7d, 0x02, 0x21, 0x00,
0xbe, 0x19, 0x10, 0x81, 0x5d, 0x0f, 0x20, 0x7a, 0x34, 0x70, 0x55, 0xae, 0xc6, 0x5e, 0xb7, 0xb9,
0xea, 0x26, 0x82, 0x9f, 0x8d, 0x72, 0xdc, 0xd0, 0x3b, 0x75, 0xfd, 0xf3, 0x58, 0x61, 0x9e, 0xcc,
};
Crypto_DataBlob dataBlob = { .data = privData, .len = sizeof(privData) };
OH_Crypto_ErrCode ret = OH_CryptoAsymKeyGenerator_Convert(ctx, CRYPTO_DER, nullptr, &dataBlob, keyPair);
if (ret != CRYPTO_SUCCESS) {
return ret;
}
return ret;
}
OH_Crypto_ErrCode doTestGetPubkeyFromPrikey()
{
OH_CryptoAsymKeyGenerator *ctx = nullptr;
OH_CryptoKeyPair *keyPair = nullptr;
OH_Crypto_ErrCode ret = OH_CryptoAsymKeyGenerator_Create("RSA1024|PRIMES_2", &ctx);
if (ret != CRYPTO_SUCCESS) {
OH_CryptoAsymKeyGenerator_Destroy(ctx);
return ret;
}
uint8_t expectedPubData[] = {
0x30, 0x5c, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x01, 0x05,
0x00, 0x03, 0x4b, 0x00, 0x30, 0x48, 0x02, 0x41, 0x00, 0xe4, 0x0c, 0xc1, 0x45, 0x43, 0xff, 0x9f,
0x2c, 0x02, 0x99, 0x11, 0x00, 0xff, 0x45, 0xb0, 0x8e, 0x01, 0xe1, 0x2f, 0x83, 0xf4, 0xe3, 0x28,
0xbe, 0x15, 0x45, 0xd9, 0x7a, 0x31, 0xfb, 0xa5, 0x6b, 0xc2, 0x1a, 0x0e, 0x1e, 0x60, 0xf6, 0xd6,
0xab, 0xdc, 0xb6, 0x72, 0x7e, 0xed, 0x52, 0xd2, 0xc3, 0x46, 0x8a, 0x99, 0x8d, 0xac, 0x50, 0x35,
0x3f, 0x8c, 0x58, 0x5d, 0xdd, 0x9f, 0x0c, 0x04, 0xc1, 0x02, 0x03, 0x01, 0x00, 0x01
};
ret = ConvertPrikeyToKeyPair(ctx, &keyPair);
if (ret != CRYPTO_SUCCESS) {
OH_CryptoAsymKeyGenerator_Destroy(ctx);
OH_CryptoKeyPair_Destroy(keyPair);
return ret;
}
OH_CryptoPubKey *pubKey = OH_CryptoKeyPair_GetPubKey(keyPair);
Crypto_DataBlob pubData = { .data = nullptr, .len = 0 };
ret = OH_CryptoPubKey_Encode(pubKey, CRYPTO_DER, nullptr, &pubData);
if (ret != CRYPTO_SUCCESS) {
OH_CryptoAsymKeyGenerator_Destroy(ctx);
OH_CryptoKeyPair_Destroy(keyPair);
return ret;
}
if (memcmp(pubData.data, expectedPubData, sizeof(expectedPubData)) != 0) {
OH_Crypto_FreeDataBlob(&pubData);
OH_CryptoAsymKeyGenerator_Destroy(ctx);
OH_CryptoKeyPair_Destroy(keyPair);
return CRYPTO_OPERTION_ERROR;
}
OH_Crypto_FreeDataBlob(&pubData);
OH_CryptoAsymKeyGenerator_Destroy(ctx);
OH_CryptoKeyPair_Destroy(keyPair);
return ret;
}