轉：https://blog.csdn.net/mrpre/article/details/51700884
1：源碼方式，只需要添加2部分，第一部分是 國密sm2的oid，第二部分是group。
如果不添加，則?EVP_PKEY 無法解析，ec_asn1_pkparameters2group 函數 因為找不到 oid對應的group導致解析私鑰失敗，或者解析x509的公鑰為空。
注：如下修改 不會 讓你支持生成SM2國密證書或者支持諸如ECC_SM4_SM3等國密加密套件。
該修改只是讓你能夠讓openssl正常解密 sm2 證書。
1：添加sm2的oid
cd?crypto/objects/
編輯 ?objects.txt ，添加:?1?2?156?10197?1?301:?SM2:?SM2
隨便加在哪里即可，我添加在文件最后。
然后在當前目錄下執行：
perl objects.pl objects.txt obj_mac.num obj_mac.h
perl obj_dat.pl obj_mac.h ?obj_dat.h
2：添加?group
ec_curve.c 中添加 2 個定義：
static?const?struct?{?EC_CURVE_DATA?h;?unsigned?char?data[0+32*6];?}
????_EC_X9_62_sm2?=?{
{?NID_X9_62_prime_field,0,32,1?},
{? /*?seed?*/
??0xFF,0xFF,0xFF,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,/*?p?*/
??0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
??0x00,0x00,0x00,0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
??0xFF,0xFF,
??????0xFF,0xFF,0xFF,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,????/*?a?*/
??????0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
??????0x00,0x00,0x00,0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
??????0xFF,0xFc,
??0x28,0xE9,0xFA,0x9E,0x9D,0x9F,0x5E,0x34,0x4D,0x5A,/*?b?*/
??0x9E,0x4B,0xCF,0x65,0x09,0xA7,0xF3,0x97,0x89,0xF5,
??????0x15,0xAB,0x8F,0x92,0xDD,0xBC,0xBD,0x41,0x4D,0x94,
??????0x0E,0x93,
??????0x32,0xC4,0xAE,0x2C,0x1F,0x19,0x81,0x19,0x5F,0x99,????/*?x?*/
??????0x04,0x46,0x6A,0x39,0xC9,0x94,0x8F,0xE3,0x0B,0xBF,?
??????0xF2,0x66,0x0B,0xE1,0x71,0x5A,0x45,0x89,0x33,0x4C,?
??????0x74,0xC7,?
??????0xBC,0x37,0x36,0xA2,0xF4,0xF6,0x77,0x9C,0x59,0xBD,????/*?y?*/
??????0xCE,0xE3,0x6B,0x69,0x21,0x53,0xD0,0xA9,0x87,0x7C,?
??????0xC6,0x2A,0x47,0x40,0x02,0xDF,0x32,0xE5,0x21,0x39,?
??????0xF0,0xA0,?
??????0xFF,0xFF,0xFF,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,?/*?order?*/
??????0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x72,0x03,0xDF,0x6B,?
??????0x21,0xC6,0x05,0x2B,0x53,0xBB,0xF4,0x09,0x39,0xD5,?
??????0x41,0x23}
}；
curve_list 中添加：
{?NID_SM2,?&_EC_X9_62_sm2.h,?0,?"sm2?curve?over?a?256?bit?prime?field"?},
然后重新make一下。
上述添加完成之后，OpenSSL即支持 SM2國密算法，能夠正常解析 SM2國密證書。
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