racoon 函数处理流程第一阶段(ph1 mode)

main.c:main() -> session.c:session() -> admin_handler()/isakmp.c:isakmp_handler()#/pfkey_handler() -> isakmp.c:isakmp_main()

->isakmp.c:ph1_main() -> isakmp_inf.c:isakmp_info_send_n1() -> isakmp_inf.c:isakmp_info_send_common() ->

oakley.c:oakley_do_encrypt() -> isakmp_inf.c:isakmp_send()


oakley.c:oakley_do_encrypt() -> algorithm.c:alg_oakley_encdef_encrypt() -> algorithm.c:alg_oakley_encdef()取得加密算法f ->

crypto_openssl.c:f->encrypt()以blowfish为例则调用eay_bf_encrypt() -> evp_crypt() -> 调用openssl 库函数实现加密

具体的加密算法和函数定义在全局struct enc_algorithm oakley_encdef[]中:
struct enc_algorithm {
    char *name;
    int type;
    int doi;
    int blocklen;
    vchar_t *(*encrypt) __P((vchar_t *, vchar_t *, vchar_t *));
    vchar_t *(*decrypt) __P((vchar_t *, vchar_t *, vchar_t *));
    int (*weakkey) __P((vchar_t *));
    int (*keylen) __P((int));
};
通过比较doi找到具体的算法函数例如：eay_bf_encrypt
pfkey_handler()处理与kernel 的交互信息