交叉编译openssl

本次编译操作版本是：openssl-1.0.0a

一、下载源码

1、打开下面的链接，选择下载 openssl-1.0.0a.tar.gz

https://www.openssl.org/source/old/1.0.0/

2、将下载的openssl-1.0.0a.tar.gz源码包拷贝到linux下，并执行如下命令解压

tar xvzf openssl-1.0.0a.tar.gz

二、配置openssl

下面配置方式，二选一即可

方式一：

./Configure no-asm no-shared no-async linux-generic32 --prefix=/data1/mayue/work/myProject/project/opensource/openssl-1.0.0a --cross-compile-prefix=/opt/buildroot-mips-gcc492-uclibc/usr/bin/mipsel-linux-

方式二：

./config no-asm shared no-async --prefix=$(pwd)/install --cross-compile-prefix=arm-linux-

之后，打开Makefile,删除里面所有的-m64和-m32编译选项。

由于是新项目编译工具链发生变化需要重新交叉编译openssl，但是交叉编译后使用时发现总是出现公钥加密失败的情况，定位到RSA_size得到的位数都不对。

之前交叉编译openssl静态库/动态库都使用的方式二，但都不好使，百度发现方式一的配置方式，尝试后终于OK，关键的不同是是否带编译参数 linux-generic32

验证demo：

//test_rsa.c#include <stdio.h>
//#include <openssl/rsa.h>
//#include <openssl/x509.h>
#include "./openssl/rsa.h"
#include "./openssl/x509.h"int main()
{int i=0;printf("hello world\n");unsigned char pub_ras_str[140] = {0x30,0x81,0x89,0x02,0x81,0x81,0x00,0xa5,0x31,0x06,0xc6,0xfc,0x89,0x5a,0x9c,0x73,0x21,0x9b,0xa2,0x0f,0x37,0x7f,0xb5,0xa1,0x73,0x0e,0xc2,0x05,0xa2,0x61,0x5e,0x9a,0x74,0x56,0x1a,0xcf,0xc4,0xe6,0x82,0x6b,0xfe,0x97,0xdc,0xb8,0x96,0x49,0x54,0x96,0xef,0x6c,0xbc,0x7a,0xbb,0x30,0xdc,0x73,0xfe,0x4f,0xde,0xa4,0x5c,0xc5,0x59,0x40,0xd0,0x66,0xee,0xfd,0x28,0x42,0x22,0xf6,0xa0,0xeb,0x45,0xe6,0x62,0x46,0x6a,0x71,0xaa,0x72,0x94,0xf7,0xdd,0xe2,0x6a,0x2e,0x8a,0x1b,0x61,0x00,0x09,0x2f,0x8b,0x9e,0x25,0x4e,0xcf,0x7f,0xce,0x59,0xdb,0xfb,0x52,0x3d,0x59,0x3e,0xd2,0x31,0x6c,0xf1,0xe8,0x31,0x7b,0xe7,0xa9,0x1f,0x19,0x1e,0xe3,0x27,0x86,0xad,0xcf,0x64,0xaf,0x60,0xd4,0x30,0x8f,0x30,0x2d,0x40,0x33,0x02,0x03,0x01,0x00,0x01};for(i=0;i<sizeof(pub_ras_str);i++){printf("pub_ras_str[%d] = %#x\n",i,pub_ras_str[i]);}unsigned char *pPubKeyBuff = pub_ras_str;int pPubKeyLength = 140;RSA *pPubRsa = NULL;int iRsa_len = -1;pPubRsa = d2i_RSAPublicKey(NULL, (const unsigned char **)&pPubKeyBuff, (long)pPubKeyLength);if (NULL == pPubRsa){printf("d2i_RSAPublicKey failed\n");return -1;}iRsa_len = RSA_size(pPubRsa) - 11; //RSA_size(pPubRsa)应该为128if (iRsa_len < 0){printf("RSA_size failed, iRsa_len[%d]\n", iRsa_len);RSA_free(pPubRsa);return -1;}printf("RSA_size ok, iRsa_len[%d] RSA_size(pPubRsa)=%d\n", iRsa_len,RSA_size(pPubRsa));return 0;
}

上面RSA_size(pPubRsa)应该为128，pub_ras_str公钥字符数组是抓包拷贝出来的。

配置参数说明：

no-asm: 在交叉编译过程中不使用汇编代码代码加速编译过程;
shared: 生成动态连接库，shared和no-shared二选一;
no-shared: 生成静态连接库，shared和no-shared二选一;
no-async: 交叉编译工具链没有提供GNU C的ucontext库;
--prefix: 安装路径;
--cross-compile-prefix: 交叉编译工具;
linux-generic32: 表示标准32位linux,平台类型选项;

三、编译

1.执行make编译工程；

2.执行make install,安装openssl到指定路径；

值得注意的是，在arm交叉编译环境中，引用库的顺序为：-lssl -lcrypto，如果为 -lcrypto -lssl就会编译错误。

四、其他

1、目前openssl目标平台可支持目前支持的包括：
https://blog.csdn.net/ty3219/article/details/77717478

BS2000-OSD BSD-generic32 BSD-generic64 BSD-ia64 BSD-sparc64 BSD-sparcv8
BSD-x86 BSD-x86-elf BSD-x86_64 Cygwin Cygwin-i386 Cygwin-i486 Cygwin-i586
Cygwin-i686 Cygwin-x86 Cygwin-x86_64 DJGPP MPE/iX-gcc OS390-Unix QNX6
QNX6-i386 UEFI UWIN VC-CE VC-WIN32 VC-WIN64A VC-WIN64A-masm VC-WIN64I aix-cc
aix-gcc aix64-cc aix64-gcc android android-armeabi android-mips android-x86
android64 android64-aarch64 bsdi-elf-gcc cc darwin-i386-cc darwin-ppc-cc
darwin64-debug-test-64-clang darwin64-ppc-cc darwin64-x86_64-cc dist gcc
haiku-x86 haiku-x86_64 hpux-ia64-cc hpux-ia64-gcc hpux-parisc-cc
hpux-parisc-gcc hpux-parisc1_1-cc hpux-parisc1_1-gcc hpux64-ia64-cc
hpux64-ia64-gcc hpux64-parisc2-cc hpux64-parisc2-gcc hurd-x86 ios-cross
ios64-cross iphoneos-cross irix-mips3-cc irix-mips3-gcc irix64-mips4-cc
irix64-mips4-gcc linux-aarch64 linux-alpha-gcc linux-aout linux-arm64ilp32
linux-armv4 linux-c64xplus linux-elf linux-generic32 linux-generic64
linux-ia64 linux-mips32 linux-mips64 linux-ppc linux-ppc64 linux-ppc64le
linux-sparcv8 linux-sparcv9 linux-x32 linux-x86 linux-x86-clang linux-x86_64
linux-x86_64-clang linux32-s390x linux64-mips64 linux64-s390x linux64-sparcv9
mingw mingw64 nextstep nextstep3.3 purify qnx4 sco5-cc sco5-gcc
solaris-sparcv7-cc solaris-sparcv7-gcc solaris-sparcv8-cc solaris-sparcv8-gcc
solaris-sparcv9-cc solaris-sparcv9-gcc solaris-x86-gcc solaris64-sparcv9-cc
solaris64-sparcv9-gcc solaris64-x86_64-cc solaris64-x86_64-gcc tru64-alpha-cc
tru64-alpha-gcc uClinux-dist uClinux-dist64 unixware-2.0 unixware-2.1
unixware-7 unixware-7-gcc vms-alpha vms-alpha-p32 vms-alpha-p64 vms-ia64
vms-ia64-p32 vms-ia64-p64 vos-gcc vxworks-mips vxworks-ppc405 vxworks-ppc60x
vxworks-ppc750 vxworks-ppc750-debug vxworks-ppc860 vxworks-ppcgen
vxworks-simlinux debug debug-erbridge debug-linux-ia32-aes debug-linux-pentium
debug-linux-ppro debug-test-64-clang

参考资料
https://blog.csdn.net/weixin_42432281/article/details/87189341
https://blog.csdn.net/ty3219/article/details/77717478
https://blog.csdn.net/klkfl/article/details/90359186
https://blog.csdn.net/linyanxin2007/article/details/82048332
https://blog.csdn.net/jnjavelin/article/details/100134655