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1# 随机生成非对称密钥对(C/C++)
2
3<!--Kit: Crypto Architecture Kit-->
4<!--Subsystem: Security-->
5<!--Owner: @zxz--3-->
6<!--Designer: @lanming-->
7<!--Tester: @PAFT-->
8<!--Adviser: @zengyawen-->
9
10以RSA和SM2为例，随机生成非对称密钥对（OH_CryptoKeyPair），并获得二进制数据。
11
12非对称密钥对可用于后续加解密等操作，二进制数据可用于存储或运输。
13
14## 在CMake脚本中链接相关动态库
15```txt
16target_link_libraries(entry PUBLIC libohcrypto.so)
17```
18
19## 随机生成RSA密钥对
20
21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)。
22
231. 调用[OH_CryptoAsymKeyGenerator_Create](../../reference/apis-crypto-architecture-kit/capi-crypto-asym-key-h.md#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）。
24
252. 调用[OH_CryptoAsymKeyGenerator_Generate](../../reference/apis-crypto-architecture-kit/capi-crypto-asym-key-h.md#oh_cryptoasymkeygenerator_generate)，随机生成非对称密钥对象（OH_CryptoKeyPair）。
26
273. 调用[OH_CryptoPubKey_Encode](../../reference/apis-crypto-architecture-kit/capi-crypto-asym-key-h.md#oh_cryptopubkey_encode)获取公钥密钥对象的二进制数据。
28
29```c++
30#include "CryptoArchitectureKit/crypto_common.h"
31#include "CryptoArchitectureKit/crypto_asym_key.h"
32
33static OH_Crypto_ErrCode randomGenerateAsymKey()
34{
35    OH_CryptoAsymKeyGenerator *ctx = nullptr;
36    OH_CryptoKeyPair *keyPair = nullptr;
37    OH_Crypto_ErrCode ret;
38
39    ret = OH_CryptoAsymKeyGenerator_Create("RSA1024|PRIMES_2", &ctx);
40    if (ret != CRYPTO_SUCCESS) {
41        OH_CryptoAsymKeyGenerator_Destroy(ctx);
42        return ret;
43    }
44
45
46    ret = OH_CryptoAsymKeyGenerator_Generate(ctx, &keyPair);
47    if (ret != CRYPTO_SUCCESS) {
48        OH_CryptoAsymKeyGenerator_Destroy(ctx);
49        OH_CryptoKeyPair_Destroy(keyPair);
50        return ret;
51    }
52
53    OH_CryptoPubKey *pubKey = OH_CryptoKeyPair_GetPubKey(keyPair);
54    Crypto_DataBlob retBlob = { .data = nullptr, .len = 0 };
55    ret = OH_CryptoPubKey_Encode(pubKey, CRYPTO_PEM, "PKCS1", &retBlob);
56    if (ret != CRYPTO_SUCCESS) {
57        OH_CryptoAsymKeyGenerator_Destroy(ctx);
58        OH_CryptoKeyPair_Destroy(keyPair);
59        return ret;
60    }
61
62    OH_Crypto_FreeDataBlob(&retBlob);
63
64    OH_CryptoAsymKeyGenerator_Destroy(ctx);
65    OH_CryptoKeyPair_Destroy(keyPair);
66    return ret;
67}
68```
69
70## 随机生成SM2密钥对
71
72对应的算法规格请查看[非对称密钥生成和转换规格：SM2](crypto-asym-key-generation-conversion-spec.md#sm2)。
73
741. 调用[OH_CryptoAsymKeyGenerator_Create](../../reference/apis-crypto-architecture-kit/capi-crypto-asym-key-h.md#oh_cryptoasymkeygenerator_create)，指定字符串参数'SM2_256'，创建密钥算法为SM2、密钥长度为256位的非对称密钥生成器（OH_CryptoAsymKeyGenerator）。
75
762. 调用[OH_CryptoAsymKeyGenerator_Generate](../../reference/apis-crypto-architecture-kit/capi-crypto-asym-key-h.md#oh_cryptoasymkeygenerator_generate)，随机生成非对称密钥对象（OH_CryptoKeyPair）。
77
783. 调用[OH_CryptoPubKey_Encode](../../reference/apis-crypto-architecture-kit/capi-crypto-asym-key-h.md#oh_cryptopubkey_encode)获取公钥密钥对象的二进制数据。
79
80
81```c++
82#include "CryptoArchitectureKit/crypto_common.h"
83#include "CryptoArchitectureKit/crypto_asym_key.h"
84
85static OH_Crypto_ErrCode randomGenerateSm2KeyPair()
86{
87    OH_CryptoAsymKeyGenerator *ctx = nullptr;
88    OH_CryptoKeyPair *dupKeyPair = nullptr;
89    OH_Crypto_ErrCode ret;
90
91    ret = OH_CryptoAsymKeyGenerator_Create("SM2_256", &ctx);
92    if (ret != CRYPTO_SUCCESS) {
93        OH_CryptoAsymKeyGenerator_Destroy(ctx);
94        return ret;
95    }
96
97    ret = OH_CryptoAsymKeyGenerator_Generate(ctx, &dupKeyPair);
98    if (ret != CRYPTO_SUCCESS) {
99        OH_CryptoAsymKeyGenerator_Destroy(ctx);
100        OH_CryptoKeyPair_Destroy(dupKeyPair);
101        return ret;
102    }
103
104    OH_CryptoPubKey *pubKey = OH_CryptoKeyPair_GetPubKey(dupKeyPair);
105    Crypto_DataBlob retBlob = { .data = nullptr, .len = 0 };
106    ret = OH_CryptoPubKey_Encode(pubKey, CRYPTO_DER, nullptr, &retBlob);
107    if (ret != CRYPTO_SUCCESS) {
108        OH_CryptoAsymKeyGenerator_Destroy(ctx);
109        OH_CryptoKeyPair_Destroy(dupKeyPair);
110        return ret;
111    }
112
113    OH_Crypto_FreeDataBlob(&retBlob);
114    OH_CryptoAsymKeyGenerator_Destroy(ctx);
115    OH_CryptoKeyPair_Destroy(dupKeyPair);
116    return ret;
117}
118```
119
120