Openssl pkcs7命令

openssl pkcs7 [-inform PEM|DER] [-outform PEM|DER] [-in filename] [-out filename] [-print] [-print_certs] [-text] [-noout] [-engine id]

-inform arg   input format - DER or PEM
 -outform arg  output format - DER or PEM
 -in arg       input file
 -out arg      output file
 -print_certs  print any certs or crl in the input
 -text         print full details of certificates
 -noout        don‘t output encoded data
 -engine e     use engine e, possibly a hardware device.

openssl pkcs7 -in file.pem -outform DER -out file.der

openssl pkcs7 -in crlpkcs7.pem -print_certs

参考：http://blog.csdn.net/as3luyuan123/article/details/16105407