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linuxÄÚºËʵÏÖÁËcrypto½Ó¿Ú£¬ÓÃÓÚÀàËÆIPSecÖ®ÀàÒªÔÚÄÚºËÖÐʵÏÖµÄÓë²Ù×÷ϵͳ°ó¶¨µÄ°²È«»úÖÆ£¬Èç¹û²»ÊÇÓÃÓÚÕâÑùµÄ»úÖÆ£¬²»ÒªÊ¹ÓÃÄÚºËÖеÄcrypto½Ó¿Ú£¬×ܵÄÀ´Ëµ£¬linuxµÄcryptoÖÐ×îÖØÒªµÄ½á¹¹ÌåÓÐÁ½¸ö£ºcrypto_tfmºÍcrypto_alg
struct crypto_tfm {
    u32 crt_flags;
    union {
        struct cipher_tfm cipher;
        struct digest_tfm digest;
        struct compress_tfm compress;
    } crt_u; //¸ÃÁªºÏÌåÖ¸³ölinuxʵÏÖÁËcipher£¬digestºÍcompressÈýÀàËã·¨£¬Ã¿Ò»ÀàÖÐÓÐÐí¶àÖÖËã·¨£¬×¢ÒâÕâ¸öÁªºÏµÄÿһ¸ö¶¼½ö½öʵÏÖÁËÒ»´óÀàËã·¨µÄʵÏÖ·â×°£¬²¢²»ÊǾßÌåµÄʵÏÖ¡£
    struct crypto_alg *__crt_alg;
    char __crt_ctx[] __attribute__ ((__aligned__));
};
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struct crypto_alg {
    struct list_head cra_list;
    u32 cra_flags;  //Õâ¸öflagsºÜÖØÒª
    unsigned int cra_blocksize;
    unsigned int cra_ctxsize;
    unsigned int cra_alignmask;
    int cra_priority;
    char cra_name[CRYPTO_MAX_ALG_NAME];
    char cra_driver_name[CRYPTO_MAX_ALG_NAME];
    union {
        struct cipher_alg cipher;
        struct digest_alg digest;
        struct compress_alg compress;
    } cra_u;
    int (*cra_init)(struct crypto_tfm *tfm);
    void (*cra_exit)(struct crypto_tfm *tfm);
    struct module *cra_module;
};
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