RSA公钥格式PKCS#1,PKCS#8互转说明
根据“获取RSA加密公钥API”接口获取的 *pem文件 格式转换之后 PKCS#1 转 PKCS#8: 命令：openssl rsa -RSAPublicKey_in -in <filename> -pubout 报错“unable to load Private Key 139906784515760:error:0906D06C:PEM routines:PEM_read_bio:no start line:pem_lib.c:697:Expecting: ANY PRIVATE KEY”
