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(PureBasic) JWS Using RSASSA-PSS using SHA-256 and MGF1 with SHA-256Creates 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 | | +--------------+-------------------------------+--------------------+ Note: This example requires Chilkat v9.5.0.66 or greater.
IncludeFile "CkJws.pb" IncludeFile "CkStringBuilder.pb" IncludeFile "CkPrivateKey.pb" IncludeFile "CkJsonObject.pb" IncludeFile "CkPublicKey.pb" Procedure ChilkatExample() ; 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.i = CkPrivateKey::ckLoadJwk(rsaKey,CkStringBuilder::ckGetAsString(sbJwk)) If success <> 1 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) <> 1 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 = CkPrivateKey::ckGetPublicKey(rsaKey) ; Set the RSA public key used for validation. signatureIndex = 0 CkJws::ckSetPublicKey(jws2,signatureIndex,rsaPubKey) CkPublicKey::ckDispose(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) 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) 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 = CkJws::ckGetProtectedHeader(jws2,signatureIndex) If CkJws::ckLastMethodSuccess(jws2) <> 1 Debug "No protected header found at the given index." CkStringBuilder::ckDispose(sbJwk) CkPrivateKey::ckDispose(rsaKey) CkJsonObject::ckDispose(jwsProtHdr) CkJws::ckDispose(jws) CkJws::ckDispose(jws2) ProcedureReturn EndIf CkJsonObject::setCkEmitCompact(joseHeader, 0) Debug "Protected (JOSE) header:" Debug CkJsonObject::ckEmit(joseHeader) CkJsonObject::ckDispose(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) ProcedureReturn EndProcedure |
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