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(Tcl) Sign MIME using RSASSA-PSS with SHA256

Demonstrates how to sign an MIME using the RSASSA-PSS signing algorithm with the SHA256 hash algorithm.

Note: This example requires Chilkat v9.5.0.67 or greater.

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

# This requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

set mime [new_CkMime]

# Create a MIME message to sign.
CkMime_NewMultipartMixed $mime
CkMime_AddHeaderField $mime "someHeader1" "Some value 1"
CkMime_AddHeaderField $mime "someHeader2" "Some value 2"

set part0 [new_CkMime]

CkMime_AddHeaderField $part0 "hdrA" "Some value A"
CkMime_AddHeaderField $part0 "hdrB" "Some value B"
CkMime_put_ContentType $part0 "text/plain"
CkMime_SetBody $part0 "This is the plain-text body."

set part1 [new_CkMime]

CkMime_AddHeaderField $part1 "hdrX" "Some value X"
CkMime_AddHeaderField $part1 "hdrY" "Some value Y"
CkMime_put_ContentType $part1 "text/xml"
CkMime_SetBody $part1 "<a>This is the XML body</a>"

CkMime_AppendPart $mime $part0
CkMime_AppendPart $mime $part1

# The MIME to be signed:
set sbUnsignedMime [new_CkStringBuilder]

CkMime_GetMimeSb $mime $sbUnsignedMime
puts [CkStringBuilder_getAsString $sbUnsignedMime]

# 	Content-Type: multipart/mixed; boundary="------------080303020600020604010008"
# 	someHeader1: Some value 1
# 	someHeader2: Some value 2
# 
# 	--------------080303020600020604010008
# 	hdrA: Some value A
# 	hdrB: Some value B
# 	Content-Type: text/plain
# 
# 	This is the plain-text body.
# 	--------------080303020600020604010008
# 	hdrX: Some value X
# 	hdrY: Some value Y
# 	Content-Type: text/xml
# 
# 	<a>This is the XML body</a>
# 	--------------080303020600020604010008--
# 

# Get a digital certificate with private key from a .pfx
# (Chilkat has many different ways to provide a cert + private key for siging.
# Using a PFX is just one possible option.)
set pfx [new_CkPfx]

set success [CkPfx_LoadPfxFile $pfx "qa_data/rsassa-pss/privatekey.pfx" "PFX_PASSWORD"]
if {$success != 1} then {
    puts [CkPfx_lastErrorText $pfx]
    delete_CkMime $mime
    delete_CkMime $part0
    delete_CkMime $part1
    delete_CkStringBuilder $sbUnsignedMime
    delete_CkPfx $pfx
    exit
}

# Get the certificate to be used for signing.
# (The typical case for a PFX is that it contains a cert with an associated private key,
# as well as other certificates in the chain of authentication.  The cert with the private
# key should be in the first position at index 0.)
# cert is a CkCert
set cert [CkPfx_GetCert $pfx 0]
if {[CkPfx_get_LastMethodSuccess $pfx] != 1} then {
    puts [CkPfx_lastErrorText $pfx]
    delete_CkMime $mime
    delete_CkMime $part0
    delete_CkMime $part1
    delete_CkStringBuilder $sbUnsignedMime
    delete_CkPfx $pfx
    exit
}

# Indicate that RSASSA-PSS with SHA256 should be used.
CkMime_put_SigningAlg $mime "pss"
CkMime_put_SigningHashAlg $mime "sha256"

# Add a detached signature.
set success [CkMime_AddDetachedSignature $mime $cert]
if {$success != 1} then {
    puts [CkMime_lastErrorText $mime]
    delete_CkCert $cert

    delete_CkMime $mime
    delete_CkMime $part0
    delete_CkMime $part1
    delete_CkStringBuilder $sbUnsignedMime
    delete_CkPfx $pfx
    exit
}

# Show the clear-signed MIME. (see the sample output below)
puts "-------------------------------------------------------------"
puts "Clear-signed MIME using detached signature:"
puts "-------------------------------------------------------------"
puts [CkMime_getMime $mime]

# Restore the original unsigned MIME, and this time create an opaque signature.
CkMime_LoadMime $mime [CkStringBuilder_getAsString $sbUnsignedMime]

# Sign using an opaque signature
set success [CkMime_ConvertToSigned $mime $cert]
if {$success != 1} then {
    puts [CkMime_lastErrorText $mime]
    delete_CkCert $cert

    delete_CkMime $mime
    delete_CkMime $part0
    delete_CkMime $part1
    delete_CkStringBuilder $sbUnsignedMime
    delete_CkPfx $pfx
    exit
}

# Show the opaque-signed MIME. (see the sample output below)
puts "-------------------------------------------------------------"
puts "Opaque-signed MIME :"
puts "-------------------------------------------------------------"
puts [CkMime_getMime $mime]

delete_CkCert $cert

puts "Success."

# -----------------------------------------------
# This is sample output for the clear-signed MIME:
# -----------------------------------------------
# 
# 	Content-Type: multipart/signed; boundary="----=_NextPart_672_c95a_97b64c9a.90b5204d";
# 	 protocol="application/x-pkcs7-signature";
# 	 micalg=sha256
# 
# 	------=_NextPart_672_c95a_97b64c9a.90b5204d
# 	Content-Type: multipart/mixed; boundary="------------030207090102000301050504"
# 	someHeader1: Some value 1
# 	someHeader2: Some value 2
# 
# 	--------------030207090102000301050504
# 	hdrA: Some value A
# 	hdrB: Some value B
# 	Content-Type: text/plain
# 
# 	This is the plain-text body.
# 	--------------030207090102000301050504
# 	hdrX: Some value X
# 	hdrY: Some value Y
# 	Content-Type: text/xml
# 
# 	<a>This is the XML body</a>
# 	--------------030207090102000301050504--
# 
# 	------=_NextPart_672_c95a_97b64c9a.90b5204d
# 	Content-Transfer-Encoding: base64
# 	Content-Type: application/x-pkcs7-signature; name="smime.p7s"
# 	Content-Disposition: attachment; filename="smime.p7s"
# 
# 	MIIG5wYJKoZIhvcNAQcCoIIG2DCCBtQCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg
# 	ggL4MIIC9DCCAl2gAwIBAgIJAMPsJCT11cniMA0GCSqGSIb3DQEBCwUAMIGSMQswCQYDVQQGEwJB
# 	VTERMA8GA1UECAwIVmljdG9yaWExEjAQBgNVBAcMCU1lbGJvdXJuZTEhMB8GA1UECgwYSW50ZXJu
# 	ZXQgV2lkZ2l0cyBQdHkgTHRkMQ8wDQYDVQQDDAZXaWRnZXQxKDAmBgkqhkiG9w0BCQEWGWFkbWlu
# 	QGludGVybmV0d2lkZ2V0cy5jb20wHhcNMTYxMTAxMTY1MjMyWhcNMjExMDMxMTY1MjMyWjCBkjEL
# 	MAkGA1UEBhMCQVUxETAPBgNVBAgMCFZpY3RvcmlhMRIwEAYDVQQHDAlNZWxib3VybmUxITAfBgNV
# 	BAoMGEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDEPMA0GA1UEAwwGV2lkZ2V0MSgwJgYJKoZIhvcN
# 	AQkBFhlhZG1pbkBpbnRlcm5ldHdpZGdldHMuY29tMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKB
# 	gQDGIdoCjyavs+F/Rm0VIB4m6O7VL1j+1IqieoR9NEX2GQvu2VCdceyxf9qaw1bxipEvjLwUkw7M
# 	e+BTlLpWQbBMH87s6KpsC8MVyXhMLpP0oM8NFix/vLz2wdLhUh7CZvJA0plqkJk9bj57QIu+EO1k
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# 	MQsGCSqGSIb3DQEHATAcBgkqhkiG9w0BCQUxDxcNMTcwNDIwMTU1NDMyWjAvBgkqhkiG9w0BCQQx
# 	IgQgFEtkdw1+iBXvplXCUkOPlq66b+mDg+HBcChLn5YowD8wXwYJKoZIhvcNAQkPMVIwUDALBglg
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# 	ZXJuZXR3aWRnZXRzLmNvbQIJAMPsJCT11cniMIGzBgsqhkiG9w0BCRACCzGBo6CBoDCBkjELMAkG
# 	A1UEBhMCQVUxETAPBgNVBAgMCFZpY3RvcmlhMRIwEAYDVQQHDAlNZWxib3VybmUxITAfBgNVBAoM
# 	GEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDEPMA0GA1UEAwwGV2lkZ2V0MSgwJgYJKoZIhvcNAQkB
# 	FhlhZG1pbkBpbnRlcm5ldHdpZGdldHMuY29tAgkAw+wkJPXVyeIwPQYJKoZIhvcNAQEKMDCgDTAL
# 	BglghkgBZQMEAgGhGjAYBgkqhkiG9w0BAQgwCwYJYIZIAWUDBAIBogMCASAEgYAvqIqKBzNXyVbh
# 	TmaxdAc4d0ZTqWT6Na3C+DMO8owSKWy5FdGbJ2DLKm92qe/KLPTcj51vuwLUQb0Sw7r5Xknl+/6p
# 	Eqn2qe/6hgDn06vvzNofVAweOtSVJsBO7/cYYPc+pXZZ2BcpZDdf/9Ci56Yrlk7A72BeqPe47J3F
# 	neC8qw==
# 
# 	------=_NextPart_672_c95a_97b64c9a.90b5204d--
# 

# -----------------------------------------------
# This is sample output for the opaque-signed MIME:
# -----------------------------------------------
# 	Content-Type: application/x-pkcs7-mime; name="smime.p7m"; smime-type="signed-data"
# 	someHeader1: Some value 1
# 	someHeader2: Some value 2
# 	Content-Disposition: attachment; filename="smime.p7m"
# 	Content-Transfer-Encoding: base64
# 
# 	MIIItAYJKoZIhvcNAQcCoIIIpTCCCKECAQExDzANBglghkgBZQMEAgEFADCCAdYGCSqGSIb3DQEH
# 	AaCCAccEggHDQ29udGVudC1UeXBlOiBtdWx0aXBhcnQvbWl4ZWQ7IGJvdW5kYXJ5PSItLS0tLS0t
# 	LS0tLS0wMDA2MDcwNzA3MDcwMTA1MDAwMTA5MDciDQpzb21lSGVhZGVyMTogU29tZSB2YWx1ZSAx
# 	DQpzb21lSGVhZGVyMjogU29tZSB2YWx1ZSAyDQoNCi0tLS0tLS0tLS0tLS0tMDAwNjA3MDcwNzA3
# 	MDEwNTAwMDEwOTA3DQpoZHJBOiBTb21lIHZhbHVlIEENCmhkckI6IFNvbWUgdmFsdWUgQg0KQ29u
# 	dGVudC1UeXBlOiB0ZXh0L3BsYWluDQoNClRoaXMgaXMgdGhlIHBsYWluLXRleHQgYm9keS4NCi0t
# 	LS0tLS0tLS0tLS0tMDAwNjA3MDcwNzA3MDEwNTAwMDEwOTA3DQpoZHJYOiBTb21lIHZhbHVlIFgN
# 	Cmhkclk6IFNvbWUgdmFsdWUgWQ0KQ29udGVudC1UeXBlOiB0ZXh0L3htbA0KDQo8YT5UaGlzIGlz
# 	IHRoZSBYTUwgYm9keTwvYT4NCi0tLS0tLS0tLS0tLS0tMDAwNjA3MDcwNzA3MDEwNTAwMDEwOTA3
# 	LS0NCqCCAvgwggL0MIICXaADAgECAgkAw+wkJPXVyeIwDQYJKoZIhvcNAQELBQAwgZIxCzAJBgNV
# 	BAYTAkFVMREwDwYDVQQIDAhWaWN0b3JpYTESMBAGA1UEBwwJTWVsYm91cm5lMSEwHwYDVQQKDBhJ
# 	bnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQxDzANBgNVBAMMBldpZGdldDEoMCYGCSqGSIb3DQEJARYZ
# 	YWRtaW5AaW50ZXJuZXR3aWRnZXRzLmNvbTAeFw0xNjExMDExNjUyMzJaFw0yMTEwMzExNjUyMzJa
# 	MIGSMQswCQYDVQQGEwJBVTERMA8GA1UECAwIVmljdG9yaWExEjAQBgNVBAcMCU1lbGJvdXJuZTEh
# 	MB8GA1UECgwYSW50ZXJuZXQgV2lkZ2l0cyBQdHkgTHRkMQ8wDQYDVQQDDAZXaWRnZXQxKDAmBgkq
# 	hkiG9w0BCQEWGWFkbWluQGludGVybmV0d2lkZ2V0cy5jb20wgZ8wDQYJKoZIhvcNAQEBBQADgY0A
# 	MIGJAoGBAMYh2gKPJq+z4X9GbRUgHibo7tUvWP7UiqJ6hH00RfYZC+7ZUJ1x7LF/2prDVvGKkS+M
# 	vBSTDsx74FOUulZBsEwfzuzoqmwLwxXJeEwuk/Sgzw0WLH+8vPbB0uFSHsJm8kDSmWqQmT1uPntA
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# 	/QTfrLOuzXKy
# 

delete_CkMime $mime
delete_CkMime $part0
delete_CkMime $part1
delete_CkStringBuilder $sbUnsignedMime
delete_CkPfx $pfx

 

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