openssl初步使用

来源：互联网发布：java final 修饰类编辑：程序博客网时间：2024/05/15 23:33

centos平台

md5.c

#include <stdio.h>#include <string.h>#include <stdlib.h>//#include "../e_os.h"#include <openssl/evp.h>#include <openssl/md5.h>static char *hex2str(unsigned char *md){    int i;    static char buf[80];    for (i = 0; i < MD5_DIGEST_LENGTH; i++)        sprintf(&(buf[i * 2]), "%02x", md[i]);    return (buf);}int main(){unsigned char md5Result[MD5_DIGEST_LENGTH];char *source = "000000";char *p;if (!EVP_Digest(source, strlen(source), md5Result, NULL, EVP_md5(),NULL)){fprintf(stderr,"err");return -1;}p = hex2str(md5Result);printf("md5(%s)=%s\n",source,p);return 0;}

makefile

CC=gccCFLAGS=-Wall -g CINC=-I. -I/home/liuyi/openssl/include LIBS=-L/home/liuyi/openssl/lib LDFLAGS=-lcrypto -lsslTARGET=md5OBJ=md5.oall:$(TARGET)$(TARGET):      $(OBJ) $(CC) $(CFLAGS) -o $@ $(OBJ) $(LIBS)  $(LDFLAGS).c.o:$(CC) -c  $(CFLAGS) $(CINC) $<clean:rm -f $(TARGET) *.o

LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/liuyi/openssl/lib
export LD_LIBRARY_PATH
./md5

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