<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta name=Title content=""><meta name=Keywords content=""><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:Arial;
panose-1:2 11 6 4 2 2 2 2 2 4;}
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:"Apple Color Emoji";
panose-1:0 0 0 0 0 0 0 0 0 0;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:Calibri;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:Calibri;
color:windowtext;}
span.msoIns
{mso-style-type:export-only;
mso-style-name:"";
text-decoration:underline;
color:teal;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:Calibri;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style></head><body bgcolor=white lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>I’m trying to debug the case of a (bad) email client sending encrypted S/MIME email that the recipient cannot decrypt (we suspect the problem is that the sender chooses a wrong public key/certificate to encrypt to).<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Unfortunately, recipient email clients do not help figuring this out. All they say is “you do not have the right key…”.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>My goal is to “unwrap” the CMS/SMIME message, and print out some identity of the recipient key/cert (anything that would allow me to tie this email to any of the keys I have, or to ascertain that it’s none of those) would help greatly. Printing out other details, such as “algorithms used” would also be helpful.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’m sure it’s possible to write an application to do that. But I strongly suspect that the “openssl” command line tool would be able to address this problem. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Would somebody on this list please show me how I can print the “metadata” (yes, that big word <span style='font-family:"Apple Color Emoji"'>☺</span>) of the S/MIME email using openssl?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks!<o:p></o:p></p><p class=MsoNormal><span style='font-size:10.5pt;color:black'>— <o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:10.5pt;color:black'>Regards,<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;color:black'>Uri<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p></div></body></html>