Digital Signing guidelines - NatWest

Placeholder
{CRLF}
{pkcs7 signature}
{CMS object with Data and Signature}
Description
Carriage Return Line Feed – 0x0D 0x0A
The pkcs7 object returned from signing application
CMS object containing original data to be signed and
the signature
An example of an S/MIME embedded signature file is:
MIME-Version: 1.0
Content-Disposition: attachment; filename=”smime.p7m”
Content-Type: application/x-pkcs7-mime; smime-type=signed-data;
name=”smime.p7m”
Content-Transfer-Encoding: base64
MIIFDgYJKoZIhvcNAQcCoIIE/zCCBPsCAQExCzAJBgUrDgMCGgUAMAsGCSqGSIb3
DQEHAaCCA54wggHLMIIBNAIBBDANBgkqhkiG9w0BAQUFADAuMQwwCgYDVQQDDANC
MkIxETAPBgNVBAoMCFN0ZXJsaW5nMQswCQYDVQQGEwJVUzAeFw0wOTA2MzAxMDU1
MTBaFw0xMTA2MzAxMDU1MTBaMC4xDDAKBgNVBAMMA0IyQjERMA8GA1UECgwIU3Rx
................................................................
...........C3v2QmT8zwqHihIHxMHLrCTZmXMM=
In this case, only the raw data need be sent to the signing application:
Field1A,Field2A,Field3A
Field1B,Field2B,Field3B
The signing application must be instructed to return the CMS object with the signed data included. This can be
then used to populate MIME Part
12