(Tcl) Generate a CSR with SAN (Subject Alternative Name) Extension

Demonstrates how to generate a private key and a Certificate Signing Request (CSR) that includes the SAN extension.

Note: This example requires Chilkat v9.5.0.84 or greater.

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load ./chilkat.dll

# Note: Requires Chilkat v9.5.0.84 or greater.

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

# First generate an RSA private key.
# (It is also possible to create CSRs based on ECDSA private keys..)
set rsa [new_CkRsa]

# Generate a random 2048-bit RSA key.
set success [CkRsa_GenerateKey $rsa 2048]
if {$success != 1} then {
    puts [CkRsa_lastErrorText $rsa]
    delete_CkRsa $rsa
    exit
}

# Get the private key
# privKey is a CkPrivateKey
set privKey [CkRsa_ExportPrivateKeyObj $rsa]

# Create the CSR object and set properties.
set csr [new_CkCsr]

# Specify the Common Name. 
CkCsr_put_CommonName $csr "mysubdomain.mydomain.com"

# Country Name (2 letter code)
CkCsr_put_Country $csr "GB"

# State or Province Name (full name)
CkCsr_put_State $csr "Yorks"

# Locality Name (eg, city)
CkCsr_put_Locality $csr "York"

# Organization Name (eg, company)
CkCsr_put_Company $csr "Internet Widgits Pty Ltd"

# Organizational Unit Name (eg, secion/division)
CkCsr_put_CompanyDivision $csr "IT"

# Email address
CkCsr_put_EmailAddress $csr "support@mydomain.com"

# Add Subject Alternative Names
# (The AddSan method is added in Chilkat v9.5.0.84)
# Call AddSan for each alternative name.
set success [CkCsr_AddSan $csr "dnsName" "mydomain.com"]
set success [CkCsr_AddSan $csr "dnsName" "mysubdomain.mydomain.com"]
set success [CkCsr_AddSan $csr "ipAddress" "192.168.0.123"]

# Create the CSR using the private key.
set pemStr [CkCsr_genCsrPem $csr $privKey]
if {[CkCsr_get_LastMethodSuccess $csr] != 1} then {
    puts [CkCsr_lastErrorText $csr]
    delete_CkPrivateKey $privKey

    delete_CkRsa $rsa
    delete_CkCsr $csr
    exit
}

# Save the private key and CSR to a files.
CkPrivateKey_SavePkcs8EncryptedPemFile $privKey "password" "qa_output/privKey1.pem"
delete_CkPrivateKey $privKey

set fac [new_CkFileAccess]

CkFileAccess_WriteEntireTextFile $fac "qa_output/csr1.pem" $pemStr "utf-8" 0

# Show the CSR.
puts "$pemStr"

# Sample output:

# 	-----BEGIN CERTIFICATE REQUEST-----
# 	MIIC6jCCAdICAQAwgaQxITAfBgNVBAMMGG15c3ViZG9tYWluLm15ZG9tYWluLmNv
# 	bTELMAkGA1UEBhMCR0IxDjAMBgNVBAgMBVlvcmtzMQ0wCwYDVQQHDARZb3JrMSEw
# 	HwYDVQQKDBhJbnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQxCzAJBgNVBAsMAklUMSMw
# 	IQYJKoZIhvcNAQkBFhRzdXBwb3J0QG15ZG9tYWluLmNvbTCCASIwDQYJKoZIhvcN
# 	AQEBBQADggEPADCCAQoCggEBALnQ0un/wF8whk+gPuiAlf3qvx14jgAOV6Erm6EB
# 	H7WACPCpnKcm/8KP+7uoPiwRQaENhMeCgf45vcivl2p6aAn/spLXyEkXyw2d8wFb
# 	YYAGRkiz4Xf7ASJiKuwcOtORz+sSDzgtdfokHfXU1cYeFE2yQhSdLUY5fMn425+g
# 	KoEEsRSjSDe6AKru4+4iGNrLKd8pB9IA5/jOE139IkWlB9r5fEPD5bUTsgqXk9eb
# 	68O0gc712V2eZK07N24lDmFC4bIMTD4csDWocR5hFHXj7NX7c8sOBDcpEb9mPIk4
# 	elxubnhkfnjhOi4J3lDHcT/0ALnbLhf9LnaiKqs+5VcVZvECAwEAAaAAMA0GCSqG
# 	SIb3DQEBBQUAA4IBAQC0AETLIcP3foh5nbu2hVFS8uCUNZ5hEIR1eXmYZmZoBQq2
# 	26ZAoT4CZwixlggC+n7WvAXJ5Pzxpl4wLV4loTiQzaKPX1w0ERo5ZRwLy0n56oG2
# 	6QG+WTViT1C8rlgtVwkCFNOXr0kSSRs8FdaPllqKxK1hxYSL7zwNpumsk39F2cDt
# 	vhcekvH0V3BuGrQFm3dKN/0azW6GOod9+Vq4VzSyOe3kp15oxLBsZOFOu/REujcw
# 	Tzu2jt1asQKUm60CZ9wNHpYepR0Ww40uP1slbehEaFDa6V8b60/tlHHmBbJ4/fy5
# 	hJnYCvjzFz4O9VtT+JtP9ldRHWV3KpZ8ne3AjD+F
# 	-----END CERTIFICATE REQUEST-----

delete_CkRsa $rsa
delete_CkCsr $csr
delete_CkFileAccess $fac