MbedTLS生成256bit的AES密钥方法

eric2013

在代码中包含：

1. #include "mbedtls/entropy.h"
   
2. #include "mbedtls/ctr_drbg.h"

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然后将以下变量定义添加到代码中：

1. mbedtls_ctr_drbg_context ctr_drbg;
   
2. mbedtls_entropy_context entropy;
   
3. unsigned char key[32];
   
4. 
   
5. char *pers = "aes generate key";
   
6. int ret;

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生成密钥：

1. mbedtls_entropy_init( &entropy );
   
2. 
   
3. mbedtls_ctr_drbg_init( &ctr_drbg );
   
4. 
   
5. if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
   
6.     (unsigned char *) pers, strlen( pers ) ) ) != 0 )
   
7. {
   
8.     printf( " failed\n ! mbedtls_ctr_drbg_init returned -0x%04x\n", -ret );
   
9.     goto exit;
   
10. }
    
11. 
    
12. if( ( ret = mbedtls_ctr_drbg_random( &ctr_drbg, key, 32 ) ) != 0 )
    
13. {
    
14.     printf( " failed\n ! mbedtls_ctr_drbg_random returned -0x%04x\n", -ret );
    
15.     goto exit;
    
16. }

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caicaptain2

密匙应该是自己定义的啊？ 为什么要它去生成一个自己都不了解的密匙呢？