(Tcl) Create JWS with Multiple Signatures using the General JSON Serialization Format

Creates a JSON Web Signature (JWS) containing 3 signatures and output using the general JSON serialization format.

Chilkat supports all of the following JWS algorithms:

   +--------------+-------------------------------+--------------------+
   | "alg" Param  | Digital Signature or MAC      | Implementation     |
   | Value        | Algorithm                     | Requirements       |
   +--------------+-------------------------------+--------------------+
   | HS256        | HMAC using SHA-256            | Required           |
   | HS384        | HMAC using SHA-384            | Optional           |
   | HS512        | HMAC using SHA-512            | Optional           |
   | RS256        | RSASSA-PKCS1-v1_5 using       | Recommended        |
   |              | SHA-256                       |                    |
   | RS384        | RSASSA-PKCS1-v1_5 using       | Optional           |
   |              | SHA-384                       |                    |
   | RS512        | RSASSA-PKCS1-v1_5 using       | Optional           |
   |              | SHA-512                       |                    |
   | ES256        | ECDSA using P-256 and SHA-256 | Recommended+       |
   | ES384        | ECDSA using P-384 and SHA-384 | Optional           |
   | ES512        | ECDSA using P-521 and SHA-512 | Optional           |
   | PS256        | RSASSA-PSS using SHA-256 and  | Optional           |
   |              | MGF1 with SHA-256             |                    |
   | PS384        | RSASSA-PSS using SHA-384 and  | Optional           |
   |              | MGF1 with SHA-384             |                    |
   | PS512        | RSASSA-PSS using SHA-512 and  | Optional           |
   |              | MGF1 with SHA-512             |                    |
   +--------------+-------------------------------+--------------------+

Note: This example requires Chilkat v9.5.0.66 or greater.

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load ./chilkat.dll

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

# Note: This example requires Chilkat v9.5.0.66 or greater.

# The JWS to be created will contain three signatures.
# The 1st will use an ECC key, the 2nd an RSA key, and the 3rd an HMAC key.

# Prepare each key..

# ---------------------------------------------------
# Use the following RSA key loaded from JWK format.
set sbRsaJwk [new_CkStringBuilder]

CkStringBuilder_Append $sbRsaJwk "{\"kty\":\"RSA\","
CkStringBuilder_Append $sbRsaJwk "\"n\":\"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx"
CkStringBuilder_Append $sbRsaJwk "HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs"
CkStringBuilder_Append $sbRsaJwk "D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH"
CkStringBuilder_Append $sbRsaJwk "SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV"
CkStringBuilder_Append $sbRsaJwk "MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8"
CkStringBuilder_Append $sbRsaJwk "NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ\","
CkStringBuilder_Append $sbRsaJwk "\"e\":\"AQAB\","
CkStringBuilder_Append $sbRsaJwk "\"d\":\"Eq5xpGnNCivDflJsRQBXHx1hdR1k6Ulwe2JZD50LpXyWPEAeP88vLNO97I"
CkStringBuilder_Append $sbRsaJwk "jlA7_GQ5sLKMgvfTeXZx9SE-7YwVol2NXOoAJe46sui395IW_GO-pWJ1O0"
CkStringBuilder_Append $sbRsaJwk "BkTGoVEn2bKVRUCgu-GjBVaYLU6f3l9kJfFNS3E0QbVdxzubSu3Mkqzjkn"
CkStringBuilder_Append $sbRsaJwk "439X0M_V51gfpRLI9JYanrC4D4qAdGcopV_0ZHHzQlBjudU2QvXt4ehNYT"
CkStringBuilder_Append $sbRsaJwk "CBr6XCLQUShb1juUO1ZdiYoFaFQT5Tw8bGUl_x_jTj3ccPDVZFD9pIuhLh"
CkStringBuilder_Append $sbRsaJwk "BOneufuBiB4cS98l2SR_RQyGWSeWjnczT0QU91p1DhOVRuOopznQ\","
CkStringBuilder_Append $sbRsaJwk "\"p\":\"4BzEEOtIpmVdVEZNCqS7baC4crd0pqnRH_5IB3jw3bcxGn6QLvnEtfdUdi"
CkStringBuilder_Append $sbRsaJwk "YrqBdss1l58BQ3KhooKeQTa9AB0Hw_Py5PJdTJNPY8cQn7ouZ2KKDcmnPG"
CkStringBuilder_Append $sbRsaJwk "BY5t7yLc1QlQ5xHdwW1VhvKn-nXqhJTBgIPgtldC-KDV5z-y2XDwGUc\","
CkStringBuilder_Append $sbRsaJwk "\"q\":\"uQPEfgmVtjL0Uyyx88GZFF1fOunH3-7cepKmtH4pxhtCoHqpWmT8YAmZxa"
CkStringBuilder_Append $sbRsaJwk "ewHgHAjLYsp1ZSe7zFYHj7C6ul7TjeLQeZD_YwD66t62wDmpe_HlB-TnBA"
CkStringBuilder_Append $sbRsaJwk "-njbglfIsRLtXlnDzQkv5dTltRJ11BKBBypeeF6689rjcJIDEz9RWdc\","
CkStringBuilder_Append $sbRsaJwk "\"dp\":\"BwKfV3Akq5_MFZDFZCnW-wzl-CCo83WoZvnLQwCTeDv8uzluRSnm71I3Q"
CkStringBuilder_Append $sbRsaJwk "CLdhrqE2e9YkxvuxdBfpT_PI7Yz-FOKnu1R6HsJeDCjn12Sk3vmAktV2zb"
CkStringBuilder_Append $sbRsaJwk "34MCdy7cpdTh_YVr7tss2u6vneTwrA86rZtu5Mbr1C1XsmvkxHQAdYo0\","
CkStringBuilder_Append $sbRsaJwk "\"dq\":\"h_96-mK1R_7glhsum81dZxjTnYynPbZpHziZjeeHcXYsXaaMwkOlODsWa"
CkStringBuilder_Append $sbRsaJwk "7I9xXDoRwbKgB719rrmI2oKr6N3Do9U0ajaHF-NKJnwgjMd2w9cjz3_-ky"
CkStringBuilder_Append $sbRsaJwk "NlxAr2v4IKhGNpmM5iIgOS1VZnOZ68m6_pbLBSp3nssTdlqvd0tIiTHU\","
CkStringBuilder_Append $sbRsaJwk "\"qi\":\"IYd7DHOhrWvxkwPQsRM2tOgrjbcrfvtQJipd-DlcxyVuuM9sQLdgjVk2o"
CkStringBuilder_Append $sbRsaJwk "y26F0EmpScGLq2MowX7fhd_QJQ3ydy5cY7YIBi87w93IKLEdfnbJtoOPLU"
CkStringBuilder_Append $sbRsaJwk "W0ITrJReOgo1cq9SbsxYawBgfp_gh6A5603k2-ZQwVK0JKSHuLFkuQ3U\""
CkStringBuilder_Append $sbRsaJwk "}"

set rsaKey [new_CkPrivateKey]

# Note: This example loads the RSA key from JWK format.  Any format can be loaded
# into the private key object. (See the online reference documentation..)
set success [CkPrivateKey_LoadJwk $rsaKey [CkStringBuilder_getAsString $sbRsaJwk]]
if {$success != 1} then {
    puts [CkPrivateKey_lastErrorText $rsaKey]
    delete_CkStringBuilder $sbRsaJwk
    delete_CkPrivateKey $rsaKey
    exit
}

# ---------------------------------------------------
# Use the following ECC key loaded from JWK format.
set sbEccJwk [new_CkStringBuilder]

CkStringBuilder_Append $sbEccJwk "{\"kty\":\"EC\","
CkStringBuilder_Append $sbEccJwk "\"crv\":\"P-256\","
CkStringBuilder_Append $sbEccJwk "\"x\":\"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU\","
CkStringBuilder_Append $sbEccJwk "\"y\":\"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0\","
CkStringBuilder_Append $sbEccJwk "\"d\":\"jpsQnnGQmL-YBIffH1136cspYG6-0iY7X1fCE9-E9LI\""
CkStringBuilder_Append $sbEccJwk "}"

set eccKey [new_CkPrivateKey]

# Note: This example loads the ECDSA key from JWK format.  Any format can be loaded
# into the private key object. (See the online reference documentation..)
set success [CkPrivateKey_LoadJwk $eccKey [CkStringBuilder_getAsString $sbEccJwk]]
if {$success != 1} then {
    puts [CkPrivateKey_lastErrorText $eccKey]
    delete_CkStringBuilder $sbRsaJwk
    delete_CkPrivateKey $rsaKey
    delete_CkStringBuilder $sbEccJwk
    delete_CkPrivateKey $eccKey
    exit
}

# ---------------------------------------------------
# The HMAC key (in base64url format)
set hmacKey "AyM1SysPpbyDfgZld3umj1qzKObwVMkoqQ-EstJQLr_T-1qS0gZH75aKtMN3Yj0iPS4hcgUuTwjAzZr1Z9CAow"

# ---------------------------------------------------
# Prepare the headers..
# RSASSA-PKCS1-v1_5 SHA-256
set jwsProtHdr0 [new_CkJsonObject]

CkJsonObject_AppendString $jwsProtHdr0 "alg" "RS256"
set jwsUnprotHdr0 [new_CkJsonObject]

CkJsonObject_AppendString $jwsUnprotHdr0 "kid" "myRsaKey"

# ECDSA using P-256 and SHA-256
set jwsProtHdr1 [new_CkJsonObject]

CkJsonObject_AppendString $jwsProtHdr1 "alg" "ES256"
set jwsUnprotHdr1 [new_CkJsonObject]

CkJsonObject_AppendString $jwsUnprotHdr1 "kid" "myEcKey"

# HMAC using SHA-256
set jwsProtHdr2 [new_CkJsonObject]

CkJsonObject_AppendString $jwsProtHdr2 "alg" "HS256"
set jwsUnprotHdr2 [new_CkJsonObject]

CkJsonObject_AppendString $jwsUnprotHdr2 "kid" "myMacKey"

# ---------------------------------------------------
# First set the JWS headers, keys, and payload, then we'll create the JWS...
set jws [new_CkJws]

CkJws_SetProtectedHeader $jws 0 $jwsProtHdr0
CkJws_SetUnprotectedHeader $jws 0 $jwsUnprotHdr0
CkJws_SetProtectedHeader $jws 1 $jwsProtHdr1
CkJws_SetUnprotectedHeader $jws 1 $jwsUnprotHdr1
CkJws_SetProtectedHeader $jws 2 $jwsProtHdr2
CkJws_SetUnprotectedHeader $jws 2 $jwsUnprotHdr2

CkJws_SetPrivateKey $jws 0 $rsaKey
CkJws_SetPrivateKey $jws 1 $eccKey
CkJws_SetMacKey $jws 2 $hmacKey "base64url"

set bIncludeBom 0
set payloadStr "In our village, folks say God crumbles up the old moon into stars."
CkJws_SetPayload $jws $payloadStr "utf-8" $bIncludeBom

# ---------------------------------------------------
# Create the JWS.
# Givent that multiple signatures will exist, only the general JSON serialization 
# format is possible, and that is what will be produced.
set jwsStr [CkJws_createJws $jws]
if {[CkJws_get_LastMethodSuccess $jws] != 1} then {
    puts [CkJws_lastErrorText $jws]
    delete_CkStringBuilder $sbRsaJwk
    delete_CkPrivateKey $rsaKey
    delete_CkStringBuilder $sbEccJwk
    delete_CkPrivateKey $eccKey
    delete_CkJsonObject $jwsProtHdr0
    delete_CkJsonObject $jwsUnprotHdr0
    delete_CkJsonObject $jwsProtHdr1
    delete_CkJsonObject $jwsUnprotHdr1
    delete_CkJsonObject $jwsProtHdr2
    delete_CkJsonObject $jwsUnprotHdr2
    delete_CkJws $jws
    exit
}

# The jwsStr is contains JSON in the smallest possible size, which is a single line.
# To get in human-readable format, load into a Chilkat JSON object and emit..
set json [new_CkJsonObject]

CkJsonObject_Load $json $jwsStr
CkJsonObject_put_EmitCompact $json 0
puts [CkJsonObject_emit $json]

# Sample output:

# { 
#   "payload": "SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu",
#   "signatures": [
#     { 
#       "protected": "eyJhbGciOiJSUzI1NiJ9",
#       "header": { 
#         "kid": "myRsaKey"
#       },
#       "signature": "B04c24gSnpVm1Z-_bemfyNMCpZm6Knj1yB-yzaIOvijsWfDgoF_mSJccTIbzapNgwJudnobr5iDOfZWiRR9iqCyDJLe5M1S40vFF7MFEI3JecYRgrRc6n1lTkYLMRyVq48BwbQlmKgPqmK9drun3agklsr0FmgNx65pfmcnlYdXsgwxf8WbgppefrlrMImp-98-dNtBcUL8ce1aOjbcyVFjGMCzpm3JerQqIzWQvEwBstnMEQle73KHcyx_nsTmlzY70CaydbRTsciOATL7WfiMwuX1q9Y2NIpTg3CbOTWKdwjh7iyfiAKQxNBaF2mApnqj9hjpf8GwR-CfxAzJtPg"
#     },
#     { 
#       "protected": "eyJhbGciOiJFUzI1NiJ9",
#       "header": { 
#         "kid": "myEcKey"
#       },
#       "signature": "2cbugKq0ERaQMh01n2B-86EZFYleeMf8bsccaQMxzOxAg14PxfjR3IImvodTJYqkmfBJYW203etz2-7ZtJUOGw"
#     },
#     { 
#       "protected": "eyJhbGciOiJIUzI1NiJ9",
#       "header": { 
#         "kid": "myMacKey"
#       },
#       "signature": "e7R9gjx0RsUNa3c7qd8k9mQGEhtcG8vsN1W7jbLb2MA"
#     }
#   ]
# }

delete_CkStringBuilder $sbRsaJwk
delete_CkPrivateKey $rsaKey
delete_CkStringBuilder $sbEccJwk
delete_CkPrivateKey $eccKey
delete_CkJsonObject $jwsProtHdr0
delete_CkJsonObject $jwsUnprotHdr0
delete_CkJsonObject $jwsProtHdr1
delete_CkJsonObject $jwsUnprotHdr1
delete_CkJsonObject $jwsProtHdr2
delete_CkJsonObject $jwsUnprotHdr2
delete_CkJws $jws
delete_CkJsonObject $json