PureBasic
PureBasic
JWS Using RSASSA-PSS using SHA-256 and MGF1 with SHA-256
See more JSON Web Signatures (JWS) Examples
Creates and validates a JSON Web Signature (JWS) using RSASSA-PSS using SHA-256 and MGF1 with SHA-256.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 | | +--------------+-------------------------------+--------------------+
Chilkat PureBasic Downloads
IncludeFile "CkJws.pb"
IncludeFile "CkStringBuilder.pb"
IncludeFile "CkPrivateKey.pb"
IncludeFile "CkJsonObject.pb"
IncludeFile "CkPublicKey.pb"
Procedure ChilkatExample()
success.i = 0
; 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.
; Use the following RSA key loaded from JWK format.
sbJwk.i = CkStringBuilder::ckCreate()
If sbJwk.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
CkStringBuilder::ckAppend(sbJwk,"{" + Chr(34) + "kty" + Chr(34) + ":" + Chr(34) + "RSA" + Chr(34) + ",")
CkStringBuilder::ckAppend(sbJwk,Chr(34) + "n" + Chr(34) + ":" + Chr(34) + "ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx")
CkStringBuilder::ckAppend(sbJwk,"HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs")
CkStringBuilder::ckAppend(sbJwk,"D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH")
CkStringBuilder::ckAppend(sbJwk,"SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV")
CkStringBuilder::ckAppend(sbJwk,"MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8")
CkStringBuilder::ckAppend(sbJwk,"NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ" + Chr(34) + ",")
CkStringBuilder::ckAppend(sbJwk,Chr(34) + "e" + Chr(34) + ":" + Chr(34) + "AQAB" + Chr(34) + ",")
CkStringBuilder::ckAppend(sbJwk,Chr(34) + "d" + Chr(34) + ":" + Chr(34) + "Eq5xpGnNCivDflJsRQBXHx1hdR1k6Ulwe2JZD50LpXyWPEAeP88vLNO97I")
CkStringBuilder::ckAppend(sbJwk,"jlA7_GQ5sLKMgvfTeXZx9SE-7YwVol2NXOoAJe46sui395IW_GO-pWJ1O0")
CkStringBuilder::ckAppend(sbJwk,"BkTGoVEn2bKVRUCgu-GjBVaYLU6f3l9kJfFNS3E0QbVdxzubSu3Mkqzjkn")
CkStringBuilder::ckAppend(sbJwk,"439X0M_V51gfpRLI9JYanrC4D4qAdGcopV_0ZHHzQlBjudU2QvXt4ehNYT")
CkStringBuilder::ckAppend(sbJwk,"CBr6XCLQUShb1juUO1ZdiYoFaFQT5Tw8bGUl_x_jTj3ccPDVZFD9pIuhLh")
CkStringBuilder::ckAppend(sbJwk,"BOneufuBiB4cS98l2SR_RQyGWSeWjnczT0QU91p1DhOVRuOopznQ" + Chr(34) + ",")
CkStringBuilder::ckAppend(sbJwk,Chr(34) + "p" + Chr(34) + ":" + Chr(34) + "4BzEEOtIpmVdVEZNCqS7baC4crd0pqnRH_5IB3jw3bcxGn6QLvnEtfdUdi")
CkStringBuilder::ckAppend(sbJwk,"YrqBdss1l58BQ3KhooKeQTa9AB0Hw_Py5PJdTJNPY8cQn7ouZ2KKDcmnPG")
CkStringBuilder::ckAppend(sbJwk,"BY5t7yLc1QlQ5xHdwW1VhvKn-nXqhJTBgIPgtldC-KDV5z-y2XDwGUc" + Chr(34) + ",")
CkStringBuilder::ckAppend(sbJwk,Chr(34) + "q" + Chr(34) + ":" + Chr(34) + "uQPEfgmVtjL0Uyyx88GZFF1fOunH3-7cepKmtH4pxhtCoHqpWmT8YAmZxa")
CkStringBuilder::ckAppend(sbJwk,"ewHgHAjLYsp1ZSe7zFYHj7C6ul7TjeLQeZD_YwD66t62wDmpe_HlB-TnBA")
CkStringBuilder::ckAppend(sbJwk,"-njbglfIsRLtXlnDzQkv5dTltRJ11BKBBypeeF6689rjcJIDEz9RWdc" + Chr(34) + ",")
CkStringBuilder::ckAppend(sbJwk,Chr(34) + "dp" + Chr(34) + ":" + Chr(34) + "BwKfV3Akq5_MFZDFZCnW-wzl-CCo83WoZvnLQwCTeDv8uzluRSnm71I3Q")
CkStringBuilder::ckAppend(sbJwk,"CLdhrqE2e9YkxvuxdBfpT_PI7Yz-FOKnu1R6HsJeDCjn12Sk3vmAktV2zb")
CkStringBuilder::ckAppend(sbJwk,"34MCdy7cpdTh_YVr7tss2u6vneTwrA86rZtu5Mbr1C1XsmvkxHQAdYo0" + Chr(34) + ",")
CkStringBuilder::ckAppend(sbJwk,Chr(34) + "dq" + Chr(34) + ":" + Chr(34) + "h_96-mK1R_7glhsum81dZxjTnYynPbZpHziZjeeHcXYsXaaMwkOlODsWa")
CkStringBuilder::ckAppend(sbJwk,"7I9xXDoRwbKgB719rrmI2oKr6N3Do9U0ajaHF-NKJnwgjMd2w9cjz3_-ky")
CkStringBuilder::ckAppend(sbJwk,"NlxAr2v4IKhGNpmM5iIgOS1VZnOZ68m6_pbLBSp3nssTdlqvd0tIiTHU" + Chr(34) + ",")
CkStringBuilder::ckAppend(sbJwk,Chr(34) + "qi" + Chr(34) + ":" + Chr(34) + "IYd7DHOhrWvxkwPQsRM2tOgrjbcrfvtQJipd-DlcxyVuuM9sQLdgjVk2o")
CkStringBuilder::ckAppend(sbJwk,"y26F0EmpScGLq2MowX7fhd_QJQ3ydy5cY7YIBi87w93IKLEdfnbJtoOPLU")
CkStringBuilder::ckAppend(sbJwk,"W0ITrJReOgo1cq9SbsxYawBgfp_gh6A5603k2-ZQwVK0JKSHuLFkuQ3U" + Chr(34))
CkStringBuilder::ckAppend(sbJwk,"}")
rsaKey.i = CkPrivateKey::ckCreate()
If rsaKey.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
; 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..)
success = CkPrivateKey::ckLoadJwk(rsaKey,CkStringBuilder::ckGetAsString(sbJwk))
If success = 0
Debug CkPrivateKey::ckLastErrorText(rsaKey)
CkStringBuilder::ckDispose(sbJwk)
CkPrivateKey::ckDispose(rsaKey)
ProcedureReturn
EndIf
; Create the JWS Protected Header
jwsProtHdr.i = CkJsonObject::ckCreate()
If jwsProtHdr.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
CkJsonObject::ckAppendString(jwsProtHdr,"alg","PS256")
jws.i = CkJws::ckCreate()
If jws.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
; Set the protected header:
signatureIndex.i = 0
CkJws::ckSetProtectedHeader(jws,signatureIndex,jwsProtHdr)
; Set the RSA key:
CkJws::ckSetPrivateKey(jws,signatureIndex,rsaKey)
; Set the payload.
bIncludeBom.i = 0
payloadStr.s = "In our village, folks say God crumbles up the old moon into stars."
CkJws::ckSetPayload(jws,payloadStr,"utf-8",bIncludeBom)
; Create the JWS
; By default, the compact serialization is used.
jwsCompact.s = CkJws::ckCreateJws(jws)
If CkJws::ckLastMethodSuccess(jws) = 0
Debug CkJws::ckLastErrorText(jws)
CkStringBuilder::ckDispose(sbJwk)
CkPrivateKey::ckDispose(rsaKey)
CkJsonObject::ckDispose(jwsProtHdr)
CkJws::ckDispose(jws)
ProcedureReturn
EndIf
Debug "JWS: " + jwsCompact
; Note: RSA PSS padding uses random values, so the output will be different each time a signature is produced.
; sample output:
; JWS: eyJhbGciOiJQUzI1NiJ9.SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu.TRWhwRo5dMv9-8OzrInfJTwmUGYgjLfHk8lqF072ND-FmLWEBnUTOpY8oJXp8FdWw2SalbdOeNlrtlJjwk4XK8Ql2iJ_2qMCtxsvLPhKBOqFoAF4aBvTOEDVJDxf0DaBSiydEEtfTVV2iwBcjWabu5J2XieR5y7QZQtuHsn7T3qKBvCcCejN3Y2oqAT3qMHvu1fTms1r_91wBn_K7Wjd9UkZ1n02qQcUHJznR_OF2BgN7_KWIDAF9ZS9keoju2NPpPelO4yxa2XUPnehY3G7dHKoCxUEQR4d2Xc5voqDASTVCDqQS4PVOZdvT3Ein6-SanAlCwbWBbkvT8g6-5PImQ
; Now load the JWS, validate, and recover the original text.
jws2.i = CkJws::ckCreate()
If jws2.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
; Load the JWS.
success = CkJws::ckLoadJws(jws2,jwsCompact)
rsaPubKey.i = CkPublicKey::ckCreate()
If rsaPubKey.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
CkPrivateKey::ckToPublicKey(rsaKey,rsaPubKey)
; Set the RSA public key used for validation.
signatureIndex = 0
CkJws::ckSetPublicKey(jws2,signatureIndex,rsaPubKey)
; Validate the 1st (and only) signature at index 0..
v.i = CkJws::ckValidate(jws2,signatureIndex)
If v < 0
; Perhaps Chilkat was not unlocked or the trial expired..
Debug "Method call failed for some other reason."
Debug CkJws::ckLastErrorText(jws2)
CkStringBuilder::ckDispose(sbJwk)
CkPrivateKey::ckDispose(rsaKey)
CkJsonObject::ckDispose(jwsProtHdr)
CkJws::ckDispose(jws)
CkJws::ckDispose(jws2)
CkPublicKey::ckDispose(rsaPubKey)
ProcedureReturn
EndIf
If v = 0
Debug "Invalid signature. The RSA key was incorrect, the JWS was invalid, or both."
CkStringBuilder::ckDispose(sbJwk)
CkPrivateKey::ckDispose(rsaKey)
CkJsonObject::ckDispose(jwsProtHdr)
CkJws::ckDispose(jws)
CkJws::ckDispose(jws2)
CkPublicKey::ckDispose(rsaPubKey)
ProcedureReturn
EndIf
; If we get here, the signature was validated..
Debug "Signature validated."
; Recover the original content:
Debug CkJws::ckGetPayload(jws2,"utf-8")
; Examine the protected header:
joseHeader.i = CkJsonObject::ckCreate()
If joseHeader.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
CkJws::ckGetProtectedH(jws2,signatureIndex,joseHeader)
CkJsonObject::setCkEmitCompact(joseHeader, 0)
Debug "Protected (JOSE) header:"
Debug CkJsonObject::ckEmit(joseHeader)
; Output:
; Signature validated.
; In our village, folks say God crumbles up the old moon into stars.
; Protected (JOSE) header:
; {
; "alg": "PS256"
; }
CkStringBuilder::ckDispose(sbJwk)
CkPrivateKey::ckDispose(rsaKey)
CkJsonObject::ckDispose(jwsProtHdr)
CkJws::ckDispose(jws)
CkJws::ckDispose(jws2)
CkPublicKey::ckDispose(rsaPubKey)
CkJsonObject::ckDispose(joseHeader)
ProcedureReturn
EndProcedure