openssl源代码分析.docVIP

Openssl源代码的特点： openssl中只有实现而没有调用的函数 openssl中各系列的函数都是用宏定义的（因而无法用代码浏览工具找到其定义） 用于定义X509的new、free、i2d和d2i函数的宏： 1、函数声明DECLARE_ASN1_FUNCTIONS(X509) 用于声明函数x509\x509.h 在openssl中的具体定义如下：asn1\asn1.h /* Declare ASN1 functions: the implement macro in in asn1t.h */ #define DECLARE_ASN1_FUNCTIONS(type) DECLARE_ASN1_FUNCTIONS_name(type, type) #define DECLARE_ASN1_ALLOC_FUNCTIONS(type) \ DECLARE_ASN1_ALLOC_FUNCTIONS_name(type, type) #define DECLARE_ASN1_FUNCTIONS_name(type, name) \ DECLARE_ASN1_ALLOC_FUNCTIONS_name(type, name) \ DECLARE_ASN1_ENCODE_FUNCTIONS(type, name, name) #define DECLARE_ASN1_FUNCTIONS_fname(type, itname, name) \ DECLARE_ASN1_ALLOC_FUNCTIONS_name(type, name) \ DECLARE_ASN1_ENCODE_FUNCTIONS(type, itname, name) #define DECLARE_ASN1_ENCODE_FUNCTIONS(type, itname, name) \ type *d2i_##name(type **a, const unsigned char **in, long len); \ int i2d_##name(type *a, unsigned char **out); \ DECLARE_ASN1_ITEM(itname) #define DECLARE_ASN1_ENCODE_FUNCTIONS_const(type, name) \ type *d2i_##name(type **a, const unsigned char **in, long len); \ int i2d_##name(const type *a, unsigned char **out); \ DECLARE_ASN1_ITEM(name) #define DECLARE_ASN1_NDEF_FUNCTION(name) \ int i2d_##name##_NDEF(name *a, unsigned char **out); #define DECLARE_ASN1_FUNCTIONS_const(name) \ DECLARE_ASN1_ALLOC_FUNCTIONS(name) \ DECLARE_ASN1_ENCODE_FUNCTIONS_const(name, name) #define DECLARE_ASN1_ALLOC_FUNCTIONS_name(type, name) \ type *name##_new(void); \ void name##_free(type *a); 用于函数的实现asn1\x_x509.c ASN1_SEQUENCE_ref(X509, x509_cb, CRYPTO_LOCK_X509) = { ASN1_SIMPLE(X509, cert_info, X509_CINF), ASN1_SIMPLE(X509, sig_alg, X509_ALGOR), ASN1_SIMPLE(X509, signature, ASN1_BIT_STRING) } ASN1_SEQUENCE_END_ref(X509, X509) IMPLEMENT_ASN1_FUNCTIONS(X509) 2、ASN1_SEQUENCE_ref： ASN1_SEQUENCE_ref：asn1\asn1t.h #define ASN1_SEQUENCE_ref(tname, cb, lck) \ static const ASN1_AUX tname##_aux = {NULL, ASN1_AFLG_REFCOUNT, offsetof(tname, references), lck, cb, 0}; \ ASN1_SEQUENCE(tname) 3、ASN1_SEQUENCE 用于SEQUE