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(Tcl) Create JWK Set Containing Certificates

Demonstrates how to create a JWK Set containing N certificates.

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

# This example creates the following JWK Set from two certificates:

# {
#   "keys": [
#     {
#       "kty": "RSA",
#       "use": "sig",
#       "kid": "BB8CeFVqyaGrGNuehJIiL4dfjzw",
#       "x5t": "BB8CeFVqyaGrGNuehJIiL4dfjzw",
#       "n": "nYf1jpn7cFdQ...9Iw",
#       "e": "AQAB",
#       "x5c": [
#         "MIIDBTCCAe2...Z+NTZo"
#       ]
#     },
#     {
#       "kty": "RSA",
#       "use": "sig",
#       "kid": "M6pX7RHoraLsprfJeRCjSxuURhc",
#       "x5t": "M6pX7RHoraLsprfJeRCjSxuURhc",
#       "n": "xHScZMPo8F...EO4QQ",
#       "e": "AQAB",
#       "x5c": [
#         "MIIC8TCCAdmgA...Vt5432GA=="
#       ]
#     }
#   ]
# }

# First get two certificates from files.
set cert1 [new_CkCert]

set success [CkCert_LoadFromFile $cert1 "qa_data/certs/brasil_cert.pem"]
if {$success != 1} then {
    puts [CkCert_lastErrorText $cert1]
    delete_CkCert $cert1
    exit
}

set cert2 [new_CkCert]

set success [CkCert_LoadFromFile $cert2 "qa_data/certs/testCert.cer"]
if {$success != 1} then {
    puts [CkCert_lastErrorText $cert2]
    delete_CkCert $cert1
    delete_CkCert $cert2
    exit
}

# We'll need this crypt object re-encode the SHA1 thumbprint from hex to base64.
set crypt [new_CkCrypt2]

set json [new_CkJsonObject]

# Let's begin with the 1st cert:
CkJsonObject_put_I $json 0
CkJsonObject_UpdateString $json "keys[i].kty" "RSA"
CkJsonObject_UpdateString $json "keys[i].use" "sig"

set hexThumbprint [CkCert_sha1Thumbprint $cert1]
set base64Thumbprint [CkCrypt2_reEncode $crypt $hexThumbprint "hex" "base64"]
CkJsonObject_UpdateString $json "keys[i].kid" $base64Thumbprint
CkJsonObject_UpdateString $json "keys[i].x5t" $base64Thumbprint

# (We're assuming these are RSA certificates)
# To get the modulus (n) and exponent (e), we need to get the cert's public key and then get its JWK.
# pubKey is a CkPublicKey
set pubKey [CkCert_ExportPublicKey $cert1]
set pubKeyJwk [new_CkJsonObject]

CkJsonObject_Load $pubKeyJwk [CkPublicKey_getJwk $pubKey]
delete_CkPublicKey $pubKey

CkJsonObject_UpdateString $json "keys[i].n" [CkJsonObject_stringOf $pubKeyJwk "n"]
CkJsonObject_UpdateString $json "keys[i].e" [CkJsonObject_stringOf $pubKeyJwk "e"]

# Now add the entire X.509 certificate 
CkJsonObject_UpdateString $json "keys[i].x5c[0]" [CkCert_getEncoded $cert1]

# Now do the same for cert2..
CkJsonObject_put_I $json 1

CkJsonObject_UpdateString $json "keys[i].kty" "RSA"
CkJsonObject_UpdateString $json "keys[i].use" "sig"

set hexThumbprint [CkCert_sha1Thumbprint $cert2]
set base64Thumbprint [CkCrypt2_reEncode $crypt $hexThumbprint "hex" "base64"]
CkJsonObject_UpdateString $json "keys[i].kid" $base64Thumbprint
CkJsonObject_UpdateString $json "keys[i].x5t" $base64Thumbprint

set pubKey [CkCert_ExportPublicKey $cert2]
CkJsonObject_Load $pubKeyJwk [CkPublicKey_getJwk $pubKey]
delete_CkPublicKey $pubKey

CkJsonObject_UpdateString $json "keys[i].n" [CkJsonObject_stringOf $pubKeyJwk "n"]
CkJsonObject_UpdateString $json "keys[i].e" [CkJsonObject_stringOf $pubKeyJwk "e"]

# Now add the entire X.509 certificate 
CkJsonObject_UpdateString $json "keys[i].x5c[0]" [CkCert_getEncoded $cert2]

# Emit the JSON..
CkJsonObject_put_EmitCompact $json 0
puts [CkJsonObject_emit $json]

delete_CkCert $cert1
delete_CkCert $cert2
delete_CkCrypt2 $crypt
delete_CkJsonObject $json
delete_CkJsonObject $pubKeyJwk

 

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