1# 指定PEM格式字符串数据转换非对称密钥对(C/C++) 2 3以RSA为例，根据指定的非对称密钥字符串数据，生成非对称密钥对（OH_CryptoKeyPair）。 4 5> **说明：** 6> 7> 针对非对称密钥的convertPemKey操作： 8> 9> - 公钥需满足：X.509规范、PKCS\#1规范、PEM编码格式。 10> 11> - 私钥需满足：PKCS\#8规范、PKCS\#1规范、PEM编码格式。 12> 13> - 当前只支持RSA非对称密钥的转换。 14 15## 在CMake脚本中链接相关动态库 16```txt 17target_link_libraries(entry PUBLIC libohcrypto.so) 18``` 19 20## 指定PEM格式字符串数据转换RSA密钥对 21 22对应的算法规格请查看[非对称密钥生成和转换规格：RSA](crypto-asym-key-generation-conversion-spec.md#rsa)。 23 241. 调用[OH_CryptoAsymKeyGenerator_Create](../../reference/apis-crypto-architecture-kit/_crypto_asym_key_api.md#oh_cryptoasymkeygenerator_create)，指定字符串参数'RSA1024'，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）。 25 26 生成RSA非对称密钥时，默认素数为2，此处省略了参数PRIMES_2。 27 282. 调用[OH_CryptoAsymKeyGenerator_Convert](../../reference/apis-crypto-architecture-kit/_crypto_asym_key_api.md#oh_cryptoasymkeygenerator_convert)，传入二进制密钥数据，生成非对称密钥对象（OH_CryptoKeyPair）。 293. 调用[OH_CryptoPubKey_Encode](../../reference/apis-crypto-architecture-kit/_crypto_asym_key_api.md#oh_cryptopubkey_encode)，将非对称密钥对象中的公钥转换成pkcs1或x509格式。 30 31- 以下以生成RSA密钥对为例： 32 33```c++ 34#include "CryptoArchitectureKit/crypto_common.h" 35#include "CryptoArchitectureKit/crypto_asym_key.h" 36 37static OH_Crypto_ErrCode doTestPemDataCovertAsymKey() 38{ 39 OH_CryptoAsymKeyGenerator *ctx = nullptr; 40 OH_Crypto_ErrCode ret; 41 42 ret = OH_CryptoAsymKeyGenerator_Create("RSA1024", &ctx); 43 if (ret != CRYPTO_SUCCESS) { 44 return ret; 45 } 46 47 uint8_t pubKeyBlobData[] = { 48,129,159,48,13,6,9,42,134,72,134,247,13,1,1,1,5,0,3,129, 48 141,0,48,129,137,2,129,129,0,235,184,151,247,130,216,140,187,64,124,219,137,140,184,53, 49 137,216,105,156,141,137,165,30,80,232,55,96,46,23,237,197,123,121,27,240,190,14,111,237, 50 172,67,42,47,164,226,248,211,157,213,194,131,109,181,41,173,217,127,252,121,126,26,130, 51 55,4,134,104,73,5,132,91,214,146,232,64,99,87,33,222,155,159,9,59,212,144,46,183,83,89, 52 220,189,148,13,176,5,139,156,230,143,16,152,79,36,8,112,40,174,35,83,82,57,137,87,123, 53 215,99,199,66,131,150,31,143,56,252,2,73,41,70,159,2,3,1,0,1 }; 54 55 OH_CryptoKeyPair *dupKeyPair = nullptr; 56 Crypto_DataBlob pubBlob = { .data = pubKeyBlobData, .len = sizeof(pubKeyBlobData) }; 57 ret = OH_CryptoAsymKeyGenerator_Convert(ctx, CRYPTO_DER, &pubBlob, nullptr, &dupKeyPair); 58 if (ret != CRYPTO_SUCCESS) { 59 OH_CryptoAsymKeyGenerator_Destroy(ctx); 60 return ret; 61 } 62 63 OH_CryptoPubKey *pubKey1 = OH_CryptoKeyPair_GetPubKey(dupKeyPair); 64 Crypto_DataBlob retBlob = { .data = nullptr, .len = 0 }; 65 ret = OH_CryptoPubKey_Encode(pubKey1, CRYPTO_PEM, "PKCS1", &retBlob); 66 if (ret != CRYPTO_SUCCESS) { 67 OH_CryptoAsymKeyGenerator_Destroy(ctx); 68 OH_CryptoKeyPair_Destroy(dupKeyPair); 69 return ret; 70 } 71 OH_Crypto_FreeDataBlob(&retBlob); 72 OH_CryptoAsymKeyGenerator_Destroy(ctx); 73 OH_CryptoKeyPair_Destroy(dupKeyPair); 74 return ret; 75} 76``` 77 78 79