mbedtls_pkcs5_pbkdf2_hmac使用示例

mbedtls_pkcs5_pbkdf2_hmac是mbed TLS库中用于实现PBKDF2的函数。下面是一个使用示例：

#include "mbedtls/pkcs5.h"
#include "mbedtls/md.h"

int main()
{
    unsigned char password\[\] = "my_password";
    size_t password_len = strlen((char*)password);
    unsigned char salt\[\] = "my_salt";
    size_t salt_len = strlen((char*)salt);
    unsigned char output\[32\]; // 输出的密钥长度为32字节
    int iterations = 10000; // 迭代次数
    mbedtls_md_type_t md_type = MBEDTLS_MD_SHA256; // 使用SHA-256哈希算法

    int ret = mbedtls_pkcs5_pbkdf2_hmac(md_type, password, password_len, salt, salt_len, iterations, sizeof(output), output);
    if (ret != 0) {
        // 错误处理
    }

    // 输出密钥
    for (size_t i = 0; i < sizeof(output); i++) {
        printf("%02x", output\[i\]);
    }
    printf("\n");

    return 0;
}

在上面的示例中，我们使用了mbedtls_pkcs5_pbkdf2_hmac函数来计算PBKDF2哈希值。我们提供了密码明文、盐、迭代次数、输出密钥的长度和哈希算法类型作为参数。函数将计算PBKDF2哈希值并将结果存储在output数组中。

请注意，这只是一个简单的示例，实际使用时需要根据具体情况进行适当的错误处理和参数验证。
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