failed to generate key pair
时间: 2023-12-03 11:19:34 浏览: 22
I'm sorry to hear that. Can you provide more details about what you are trying to do and what error message you are encountering? It would help me better understand the issue and provide better assistance.
相关问题
ECC加密算法c语言实现
以下是ECC加密算法的C语言实现代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/ec.h>
#include <openssl/ecdsa.h>
#include <openssl/obj_mac.h>
#include <openssl/err.h>
int main()
{
EC_KEY *key = NULL;
EC_GROUP *group = NULL;
unsigned char *msg = "hello world";
size_t msg_len = strlen(msg);
// 生成密钥对
key = EC_KEY_new_by_curve_name(NID_secp256k1);
if (!key) {
fprintf(stderr, "Failed to create key.\n");
return -1;
}
if (!EC_KEY_generate_key(key)) {
fprintf(stderr, "Failed to generate key pair.\n");
return -1;
}
group = EC_KEY_get0_group(key);
// 签名
unsigned int sig_len = ECDSA_size(key);
unsigned char *sig = (unsigned char *)malloc(sig_len);
if (!ECDSA_sign(0, msg, msg_len, sig, &sig_len, key)) {
fprintf(stderr, "Failed to sign message.\n");
return -1;
}
// 验证签名
if (!ECDSA_verify(0, msg, msg_len, sig, sig_len, key)) {
fprintf(stderr, "Failed to verify signature.\n");
return -1;
}
// 释放资源
free(sig);
EC_KEY_free(key);
return 0;
}
```
该代码中使用了OpenSSL库来实现ECC加密算法。首先,使用`EC_KEY_new_by_curve_name()`函数创建一个EC_KEY对象,并指定曲线类型为secp256k1,然后使用`EC_KEY_generate_key()`函数生成密钥对。接着,使用`ECDSA_sign()`函数对消息进行签名,将签名结果存储在`sig`中。最后,使用`ECDSA_verify()`函数验证签名的有效性。最后,释放资源,包括EC_KEY对象和签名结果的内存空间。
用c语言写椭圆曲线加密算法
下面是一个简单的椭圆曲线加密算法的C语言实现示例:
```c
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <openssl/ec.h>
#include <openssl/evp.h>
#include <openssl/bn.h>
// 椭圆曲线参数
const char *curve_name = "secp256k1";
// 生成ECC密钥对
void generate_keypair(EVP_PKEY **pkey) {
EC_KEY *ec_key = NULL;
EVP_PKEY *evp_key = NULL;
// 生成EC_KEY对象
ec_key = EC_KEY_new_by_curve_name(OBJ_sn2nid(curve_name));
if (ec_key == NULL) {
printf("Error: failed to generate EC_KEY object.\n");
return;
}
// 生成密钥对
if (EC_KEY_generate_key(ec_key) != 1) {
printf("Error: failed to generate key pair.\n");
return;
}
// 将EC_KEY对象转换为EVP_PKEY对象
evp_key = EVP_PKEY_new();
if (EVP_PKEY_assign_EC_KEY(evp_key, ec_key) != 1) {
printf("Error: failed to assign EC_KEY object to EVP_PKEY.\n");
return;
}
*pkey = evp_key;
}
// 加密数据
void encrypt_data(const EVP_PKEY *pkey, const unsigned char *in, int in_len, unsigned char **out, int *out_len) {
int len;
EVP_CIPHER_CTX *ctx = NULL;
const EVP_CIPHER *cipher = NULL;
// 获取加密算法
cipher = EVP_get_cipherbyname("aes-256-cbc");
if (cipher == NULL) {
printf("Error: failed to get cipher algorithm.\n");
return;
}
// 创建加密上下文
ctx = EVP_CIPHER_CTX_new();
if (ctx == NULL) {
printf("Error: failed to create cipher context.\n");
return;
}
// 初始化加密上下文
if (EVP_EncryptInit_ex(ctx, cipher, NULL, NULL, NULL) != 1) {
printf("Error: failed to initialize cipher context.\n");
return;
}
// 设置密钥
if (EVP_PKEY_CTX_set_ec_key(ctx, pkey) != 1) {
printf("Error: failed to set EC key.\n");
return;
}
// 加密数据
*out = malloc(in_len + EVP_CIPHER_block_size(cipher));
if (*out == NULL) {
printf("Error: failed to allocate memory for output buffer.\n");
return;
}
if (EVP_EncryptUpdate(ctx, *out, &len, in, in_len) != 1) {
printf("Error: failed to encrypt data.\n");
return;
}
// 结束加密
if (EVP_EncryptFinal_ex(ctx, *out + len, &len) != 1) {
printf("Error: failed to finalize cipher context.\n");
return;
}
*out_len = len + in_len;
EVP_CIPHER_CTX_free(ctx);
}
// 解密数据
void decrypt_data(const EVP_PKEY *pkey, const unsigned char *in, int in_len, unsigned char **out, int *out_len) {
int len;
EVP_CIPHER_CTX *ctx = NULL;
const EVP_CIPHER *cipher = NULL;
// 获取解密算法
cipher = EVP_get_cipherbyname("aes-256-cbc");
if (cipher == NULL) {
printf("Error: failed to get cipher algorithm.\n");
return;
}
// 创建解密上下文
ctx = EVP_CIPHER_CTX_new();
if (ctx == NULL) {
printf("Error: failed to create cipher context.\n");
return;
}
// 初始化解密上下文
if (EVP_DecryptInit_ex(ctx, cipher, NULL, NULL, NULL) != 1) {
printf("Error: failed to initialize cipher context.\n");
return;
}
// 设置密钥
if (EVP_PKEY_CTX_set_ec_key(ctx, pkey) != 1) {
printf("Error: failed to set EC key.\n");
return;
}
// 解密数据
*out = malloc(in_len + EVP_CIPHER_block_size(cipher));
if (*out == NULL) {
printf("Error: failed to allocate memory for output buffer.\n");
return;
}
if (EVP_DecryptUpdate(ctx, *out, &len, in, in_len) != 1) {
printf("Error: failed to decrypt data.\n");
return;
}
// 结束解密
if (EVP_DecryptFinal_ex(ctx, *out + len, &len) != 1) {
printf("Error: failed to finalize cipher context.\n");
return;
}
*out_len = len + in_len;
EVP_CIPHER_CTX_free(ctx);
}
int main() {
EVP_PKEY *pkey = NULL;
unsigned char *encrypted_text = NULL;
unsigned char *decrypted_text = NULL;
int encrypted_len, decrypted_len;
const unsigned char *plain_text = "Hello, World!";
// 生成密钥对
generate_keypair(&pkey);
// 加密数据
encrypt_data(pkey, plain_text, strlen(plain_text), &encrypted_text, &encrypted_len);
printf("Encrypted text: %s\n", encrypted_text);
// 解密数据
decrypt_data(pkey, encrypted_text, encrypted_len, &decrypted_text, &decrypted_len);
printf("Decrypted text: %s\n", decrypted_text);
// 释放资源
free(encrypted_text);
free(decrypted_text);
EVP_PKEY_free(pkey);
return 0;
}
```
需要注意的是,上面的示例程序中使用了OpenSSL库来处理椭圆曲线加密算法。在编译时需要加上`-lssl -lcrypto`参数才能链接上这两个库。另外,由于椭圆曲线加密算法涉及到大数运算,因此需要使用大数运算库来处理相关的计算。在OpenSSL库中,已经内置了BN库用于处理大数运算。