i am using crypto/pkcs7/dec.c to decrypt the smime.p7m that outlook express5 generated( encrypted and sign message), but i found that dec.c just generate the result below, no plain text was generated. Anyone can help me?? //--------------------------- Content-Type: application/x-pkcs7-mime; name=smime.p7m; smime-type=signed-data Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename=smime.p7m MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAaCAJIAEBEZyb20E AjogBAEiBAhOb3J0b25OZwQBIgQCIDwEFWprbmdAY3NpZS5uY3R1LmVkdS50dwQBPgQCDQoEAlRv BAI6IAQBIgQITm9ydG9uTmcEASIEAiA8BBVqa25nQGNzaWUubmN0dS5lZHUudHcEAT4EAg0KBAdT dWJqZWN0BAI6IAQOZW5jcnlwdCAmIHNpZ24EAg0KBAREYXRlBAI6IAQfRnJpLCAxNiBKdWwgMTk5 OSAxNjozMTowOCArMDgwMAQCDQoEDENvbnRlbnQtVHlwZQQCOiAEFW11bHRpcGFydC9hbHRlcm5h dGl2ZQQEOw0KCQQIYm91bmRhcnkEAT0EASIEKS0tLS09X05leHRQYXJ0XzAw ......... ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List [EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED]