１先导出成无密码的
openssl pkcs12 -in protected.p12 -nodes -out temp.pem
# -> Enter password
openssl pkcs12 -in protected.p12 -nodes -out temp.pem
# -> Enter password
openssl pkcs12 -in protected.p12 -nodes -out temp.pem # -> Enter password
２再加密码
openssl pkcs12 -export -in temp.pem -out unprotected.p12
# -> Just press [return] twice for no password
openssl pkcs12 -export -in temp.pem -out unprotected.p12
# -> Just press [return] twice for no password
openssl pkcs12 -export -in temp.pem -out unprotected.p12 # -> Just press [return] twice for no password
３删除临时文件
rm temp.pem
rm temp.pem
rm temp.pem