hash - AS2 SHA1 Calculation of digest using openssl

Question

I am trying generate the correct return message integrity check (MIC) for mendelson AS2 server to validate against using openssl. However even using the orignal sent payload data my digest comes up with a different value and I cannot see what I am doing wrong.

Mendelson reports The Message Integrity Code (MIC) does not match the sent AS2 message (required: 9SivZLL9PbyioTu2z6Xj7qCbLS8=, sha1, returned: k5x12GjjKWWX63R2pf+V/jVKXgQ=, sha1).

openssl dgst -binary -sha1 <filename> | base64

Is my openssl command usage wrong?

This is my payload data

Date: Fri, 5 Feb 2021 09:42:06 +0000 (GMT)

------=_Part_88_23367641.1612518126911
Content-Type: application/EDI-consent
Content-Transfer-Encoding: binary
Content-Disposition: attachment; filename=delivery1.csv

deliveryId,action,supplierId,siteId,clientId,deliveryType,hostComments,deliveryStartTime,deliveryEndTime
20210111001,UPDATE,PARM OLIVE,BAWTRY,COLGATE,SUPPLIER,Call Bob before delivery,2021-02-01 00:00:00Z,2021-02-16 12:00:00Z

------=_Part_88_23367641.1612518126911
Content-Type: application/pkcs7-signature; name=smime.p7s; smime-type=signed-data
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="smime.p7s"
Content-Description: S/MIME Cryptographic Signature
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ggEBAFQ/e487K9LBsl0ol+1g590S1IWBAlEwXIlv/NjcGG0Vb3KVWTN76lAsuMPLicsXucalrfq/
lPFdtJJ8/ejg1LVFzitvmD+EaLQvHWLJ8JgNsJUjm3w10zyN/GSNvpthCSNrvjv0335sK8zykoV+
V8R7ax+Li3qqpripdhi1VLBMmykPymBGcx0BLmF38OSx5bCocQ58udaLC0CBLxoXJp8Z1kp9OhWw
ueQUPBu7eBwaHFf55nP3e65dz2Er3E1iX4MYK/1vczlLrKdBE/iHhjr5Fcf8yREengJ4fd1aGsba
izWBR+JBhK4UkYn5JZXVdH2vuOQGjSqb4aLk8hwTFscAADGCAqwwggKoAgEBMIHDMIG6MSMwIQYJ
KoZIhvcNAQkBFhRzZXJ2aWNlQG1lbmRlbHNvbi5kZTELMAkGA1UEBhMCREUxDzANBgNVBAgMBkJl
cmxpbjEPMA0GA1UEBwwGQmVybGluMSIwIAYDVQQKDBltZW5kZWxzb24tZS1jb21tZXJjZSBHbWJI
MSEwHwYDVQQLDBhEbyBub3QgdXNlIGluIHByb2R1Y3Rpb24xHTAbBgNVBAMMFG1lbmRlbHNvbiB0
ZXN0IGtleSAzAgRaKlscMAkGBSsOAwIaBQCggb4wGAYJKoZIhvcNAQkDMQsGCSqGSIb3DQEHATAc
BgkqhkiG9w0BCQUxDxcNMjEwMjA1MDk0MjA2WjAjBgkqhkiG9w0BCQQxFgQU9SivZLL9PbyioTu2
z6Xj7qCbLS8wKQYJKoZIhvcNAQk0MRwwGjAJBgUrDgMCGgUAoQ0GCSqGSIb3DQEBAQUAMDQGCSqG
SIb3DQEJDzEnMCUwCgYIKoZIhvcNAwcwDgYIKoZIhvcNAwICAgCAMAcGBSsOAwIHMA0GCSqGSIb3
DQEBAQUABIIBAHCfifmgiNLOi9jUhcqq6AMHGh6pns/17bplBbwCmQB7CtwyFt1Bu9D6y3w25gsg
mavgXWetxvX53LkEtZjKh7TOlDW/Ds+lYsQadzhaogiQYjd0qRErDpkPiGkbY1jrGsUX6uAVvNK0
WKtaqrqxSSD3gADe4Po5rUd3oyIoDRj7vwuvZKEVuOOaBI0/U9lMbhq2lxSDF8WfInFdLCCg5H1D
qwUYGYA671cKwNLTvjimtqitZMyZmDoOhXgl1neyjZYfnXHM9yeA7x+0tTgjwHMk6+8e6UGljhCv
VZ1aaS7MScapVCRmwU+Ft+mlpvUcCkG+IMO5F0ypneyo1fFTMIQAAAAAAAA=
------=_Part_88_23367641.1612518126911--

question from:https://stackoverflow.com/questions/66061100/as2-sha1-calculation-of-digest-using-openssl

Answer 1

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