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简介
OpenSSL是一个功能丰富且自包含的开源安全工具箱。它提供的主要功能有：SSL协议实现(包括SSLv2、SSLv3和TLSv1)、大量软算法(对称/非对称/摘要)、大数运算、非对称算法密钥生成、ASN.1编解码库、证书请求(PKCS10)编解码、数字证书编解码、CRL编解码、OCSP协议、数字证书验证、PKCS7标准实现和PKCS12个人数字证书格式实现等功能。
OpenSSL采用C语言作为开发语言，这使得它具有优秀的跨平台性能。OpenSSL支持Linux、UNIX、windows、Mac等平台。OpenSSL目前最新的版本是openssl-1.0.0e.
编译安装
1、资源下载
http://www.openssl.org/source/openssl-1.0.0e.tar.gz
2、编译安装
cd openssl-1.0.0e
./config make make install
API文档
http://www.openssl.org/docs/crypto/crypto.html http://www.openssl.org/docs/ssl/ssl.html
编程示例
程序1：openssl堆栈示例
#include <stdio.h> #include <stdlib.h> #include <string.h> #include <openssl/safestack.h> #define sk_Student_new(st) SKM_sk_new(Student, (st)) #define sk_Student_new_null() SKM_sk_new_null(Student) #define sk_Student_free(st) SKM_sk_free(Student, (st)) #define sk_Student_num(st) SKM_sk_num(Student, (st)) #define sk_Student_value(st, i) SKM_sk_value(Student, (st), (i)) #define sk_Student_set(st, i, val) SKM_sk_set(Student, (st), (i), (val)) #define sk_Student_zero(st) SKM_sk_zero(Student, (st)) #define sk_Student_push(st, val) SKM_sk_push(Student, (st), (val)) #define sk_Student_unshift(st, val) SKM_sk_unshift(Student, (st), (val)) #define sk_Student_find(st, val) SKM_sk_find(Student, (st), (val)) #define sk_Student_delete(st, i) SKM_sk_delete(Student, (st), (i)) #define sk_Student_delete_ptr(st, ptr) SKM_sk_delete_ptr(Student, (st), (ptr)) #define sk_Student_insert(st, val, i) SKM_sk_insert(Student, (st), (val), (i)) #define sk_Student_set_cmp_func(st, cmp) SKM_sk_set_cmp_func(Student, (st), (cmp)) #define sk_Student_dup(st) SKM_sk_dup(Student, st) #define sk_Student_pop_free(st, free_func) SKM_sk_pop_free(Student, (st), (free_func)) #define sk_Student_shift(st) SKM_sk_shift(Student, (st)) #define sk_Student_pop(st) SKM_sk_pop(Student, (st)) #define sk_Student_sort(st) SKM_sk_sort(Student, (st)) typedef struct Student_st { char *name; int age; char *otherInfo; } Student; typedef STACK_OF(Student) Students; Student *Student_Malloc() { Student *a=malloc(sizeof(Student));
a->name=(char *)malloc(sizeof(char)*20); strcpy(a->name,"zcp"); a->otherInfo=(char *)malloc(sizeof(char)*20);
strcpy(a->otherInfo,"no info");
return a; } void Student_Free(Student *a) { free(a->name); free(a->otherInfo); free(a); } static int Student_cmp(Student *a,Student *b) { int ret; ret=strcmp(a->name,b->name); /* 只比较关键字 */ return ret; } int main() { Students *s,*snew; Student *s1,*one,*s2; int i,num; s=sk_Student_new_null(); /* 新建一个堆栈对象 */ snew=sk_Student_new(Student_cmp); /* 新建一个堆栈对象 */
s2=Student_Malloc(); sk_Student_push(snew,s2); i=sk_Student_find(snew,s2);
s1=Student_Malloc(); sk_Student_push(s,s1); num=sk_Student_num(s); for(i=0; i<num; i++) { one=sk_Student_value(s,i); printf("student name : %s\n",one->name); printf("sutdent age : %d\n",one->age); printf("student otherinfo : %s\n\n\n",one->otherInfo); }
sk_Student_pop_free(s,Student_Free); sk_Student_pop_free(snew,Student_Free); return 0; }
编译
gcc example1.c -o example1 -L/usr/lib -lssl -lcrypto
运行
程序2：openssl哈希表示例
#include <string.h> #include <openssl/lhash.h> typedef struct Student_st { char name[20]; int age; char otherInfo[200]; } Student; static int Student_cmp(const void *a, const void *b) { char *namea=((Student *)a)->name; char *nameb=((Student *)b)->name; return strcmp(namea,nameb); } /* 打印每个值*/ static void PrintValue(Student *a) { printf("name :%s\n",a->name); printf("age :%d\n",a->age); printf("otherInfo : %s\n",a->otherInfo); } static void PrintValue_arg(Student *a,void *b) { int flag=0; flag=*(int *)b; printf("用户输入参数为:%d\n",flag); printf("name :%s\n",a->name); printf("age :%d\n",a->age); printf("otherInfo : %s\n",a->otherInfo); } int main() { int flag=11; _LHASH *h; Student s1= {"zcp",28,"hu bei"}, s2= {"forxy",28,"no info"}, s3= {"skp",24,"student"}, s4= {"zhao_zcp",28,"zcp‘s name"}, *s5; void *data; /*创建哈希表*/ h=lh_new(NULL,Student_cmp); if(h==NULL) { printf("err.\n"); return -1; } /*将数据插入哈希表*/ data=&s1; lh_insert(h,data); data=&s2; lh_insert(h,data); data=&s3; lh_insert(h,data); data=&s4; lh_insert(h,data); /*遍历打印*/ lh_doall(h,PrintValue); lh_doall_arg(h,PrintValue_arg,(void *)(&flag)); /*查找数据*/ data=lh_retrieve(h,(const void*)"skp"); if(data==NULL) { printf("can not find skp!\n"); lh_free(h); return -1; } else { s5=data; printf("\n\nstudent name : %s\n",s5->name); printf("sutdent age : %d\n",s5->age); printf("student otherinfo : %s\n",s5->otherInfo); lh_free(h); } getchar(); return 0; }
编译
gcc example2.c -o example2 -L/usr/lib -lssl -lcrypto
运行
程序3：openssl内存管理示例
#include <openssl/crypto.h> #include <openssl/bio.h> int main() { char *p; BIO *b; CRYPTO_malloc_debug_init(); CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL); CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON); /*开户内存记录*/ p=OPENSSL_malloc(4); CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_OFF);/*关闭内存记录*/ b=BIO_new_file("leak.log","w"); CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON); CRYPTO_mem_leaks(b); /*将内存泄露输出到FILE中*/ OPENSSL_free(p); BIO_free(b); return 0; }
编译
gcc example3.c -o example3 -L/usr/lib -lssl -lcrypto
运行
程序4：动态模块加载
#include <openssl/dso.h> #include <openssl/bio.h> #include <openssl/safestack.h> int main() { DSO *d; void (*f)(); BIO *(*BIO_newx)(BIO_METHOD *a); BIO *test; char *load_name; const char *loaded_name; int flags; d=DSO_new(); #if 0 DSO_set_name_converter DSO_ctrl(d,DSO_CTRL_SET_FLAGS,DSO_FLAG_NO_NAME_TRANSLATION,NULL); DSO_ctrl(d,DSO_CTRL_SET_FLAGS,DSO_FLAG_NAME_TRANSLATION_EXT_ONLY,NULL); DSO_ctrl(d,DSO_CTRL_SET_FLAGS,DSO_FLAG_GLOBAL_SYMBOLS,NULL); /* 最好写成libeay32而不是libeay32.dll， 除非前面调用了DSO_ctrl(d,DSO_CTRL_SET_FLAGS,DSO_FLAG_NO_NAME_TRANSLATION,NULL)否则它会加载libeay32.dll.dll */ load_name=DSO_merge(d,"libeay32","D:\\zcp\\OpenSSL\\openssl-0.9.8b\\out32dll\\Debug"); #endif d=DSO_load(d,"libeay32",NULL,0); if(d==NULL) { printf("err"); return -1; } loaded_name=DSO_get_loaded_filename(d); if(loaded_name!=NULL) { printf("loaded file is %s\n",loaded_name); } flags=DSO_flags(d); printf("current falgs is %d\n",flags); DSO_up_ref(d); f=(void (*)())DSO_bind_var(d,"BIO_new"); BIO_newx=(BIO *(*)(BIO_METHOD *))f; test=BIO_newx(BIO_s_file()); BIO_set_fp(test,stdout,BIO_NOCLOSE); BIO_puts(test,"abd\n\n"); BIO_free(test); DSO_free(d); printf("handle in dso number is : %d\n",d->meth_data->num); DSO_free(d); printf("handle in dso number is : %d\n",d->meth_data->num); return 0; }
编译
gcc example4.c -o example4 -L/usr/lib -lssl -lcrypto
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原文地址：http://www.cnblogs.com/274914765qq/p/4398969.html
