Xojo Plugin
Xojo Plugin
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 Xojo Plugin Downloads
Dim success As Boolean
success = False
// 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.
Dim sbJwk As New Chilkat.StringBuilder
success = sbJwk.Append("{""kty"":""RSA"",")
success = sbJwk.Append("""n"":""ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx")
success = sbJwk.Append("HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs")
success = sbJwk.Append("D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH")
success = sbJwk.Append("SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV")
success = sbJwk.Append("MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8")
success = sbJwk.Append("NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ"",")
success = sbJwk.Append("""e"":""AQAB"",")
success = sbJwk.Append("""d"":""Eq5xpGnNCivDflJsRQBXHx1hdR1k6Ulwe2JZD50LpXyWPEAeP88vLNO97I")
success = sbJwk.Append("jlA7_GQ5sLKMgvfTeXZx9SE-7YwVol2NXOoAJe46sui395IW_GO-pWJ1O0")
success = sbJwk.Append("BkTGoVEn2bKVRUCgu-GjBVaYLU6f3l9kJfFNS3E0QbVdxzubSu3Mkqzjkn")
success = sbJwk.Append("439X0M_V51gfpRLI9JYanrC4D4qAdGcopV_0ZHHzQlBjudU2QvXt4ehNYT")
success = sbJwk.Append("CBr6XCLQUShb1juUO1ZdiYoFaFQT5Tw8bGUl_x_jTj3ccPDVZFD9pIuhLh")
success = sbJwk.Append("BOneufuBiB4cS98l2SR_RQyGWSeWjnczT0QU91p1DhOVRuOopznQ"",")
success = sbJwk.Append("""p"":""4BzEEOtIpmVdVEZNCqS7baC4crd0pqnRH_5IB3jw3bcxGn6QLvnEtfdUdi")
success = sbJwk.Append("YrqBdss1l58BQ3KhooKeQTa9AB0Hw_Py5PJdTJNPY8cQn7ouZ2KKDcmnPG")
success = sbJwk.Append("BY5t7yLc1QlQ5xHdwW1VhvKn-nXqhJTBgIPgtldC-KDV5z-y2XDwGUc"",")
success = sbJwk.Append("""q"":""uQPEfgmVtjL0Uyyx88GZFF1fOunH3-7cepKmtH4pxhtCoHqpWmT8YAmZxa")
success = sbJwk.Append("ewHgHAjLYsp1ZSe7zFYHj7C6ul7TjeLQeZD_YwD66t62wDmpe_HlB-TnBA")
success = sbJwk.Append("-njbglfIsRLtXlnDzQkv5dTltRJ11BKBBypeeF6689rjcJIDEz9RWdc"",")
success = sbJwk.Append("""dp"":""BwKfV3Akq5_MFZDFZCnW-wzl-CCo83WoZvnLQwCTeDv8uzluRSnm71I3Q")
success = sbJwk.Append("CLdhrqE2e9YkxvuxdBfpT_PI7Yz-FOKnu1R6HsJeDCjn12Sk3vmAktV2zb")
success = sbJwk.Append("34MCdy7cpdTh_YVr7tss2u6vneTwrA86rZtu5Mbr1C1XsmvkxHQAdYo0"",")
success = sbJwk.Append("""dq"":""h_96-mK1R_7glhsum81dZxjTnYynPbZpHziZjeeHcXYsXaaMwkOlODsWa")
success = sbJwk.Append("7I9xXDoRwbKgB719rrmI2oKr6N3Do9U0ajaHF-NKJnwgjMd2w9cjz3_-ky")
success = sbJwk.Append("NlxAr2v4IKhGNpmM5iIgOS1VZnOZ68m6_pbLBSp3nssTdlqvd0tIiTHU"",")
success = sbJwk.Append("""qi"":""IYd7DHOhrWvxkwPQsRM2tOgrjbcrfvtQJipd-DlcxyVuuM9sQLdgjVk2o")
success = sbJwk.Append("y26F0EmpScGLq2MowX7fhd_QJQ3ydy5cY7YIBi87w93IKLEdfnbJtoOPLU")
success = sbJwk.Append("W0ITrJReOgo1cq9SbsxYawBgfp_gh6A5603k2-ZQwVK0JKSHuLFkuQ3U""")
success = sbJwk.Append("}")
Dim rsaKey As New Chilkat.PrivateKey
// 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 = rsaKey.LoadJwk(sbJwk.GetAsString())
If (success = False) Then
System.DebugLog(rsaKey.LastErrorText)
Return
End If
// Create the JWS Protected Header
Dim jwsProtHdr As New Chilkat.JsonObject
success = jwsProtHdr.AppendString("alg","PS256")
Dim jws As New Chilkat.Jws
// Set the protected header:
Dim signatureIndex As Int32
signatureIndex = 0
success = jws.SetProtectedHeader(signatureIndex,jwsProtHdr)
// Set the RSA key:
success = jws.SetPrivateKey(signatureIndex,rsaKey)
// Set the payload.
Dim bIncludeBom As Boolean
bIncludeBom = False
Dim payloadStr As String
payloadStr = "In our village, folks say God crumbles up the old moon into stars."
success = jws.SetPayload(payloadStr,"utf-8",bIncludeBom)
// Create the JWS
// By default, the compact serialization is used.
Dim jwsCompact As String
jwsCompact = jws.CreateJws()
If (jws.LastMethodSuccess = False) Then
System.DebugLog(jws.LastErrorText)
Return
End If
System.DebugLog("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.
Dim jws2 As New Chilkat.Jws
// Load the JWS.
success = jws2.LoadJws(jwsCompact)
Dim rsaPubKey As New Chilkat.PublicKey
success = rsaKey.ToPublicKey(rsaPubKey)
// Set the RSA public key used for validation.
signatureIndex = 0
success = jws2.SetPublicKey(signatureIndex,rsaPubKey)
// Validate the 1st (and only) signature at index 0..
Dim v As Int32
v = jws2.Validate(signatureIndex)
If (v < 0) Then
// Perhaps Chilkat was not unlocked or the trial expired..
System.DebugLog("Method call failed for some other reason.")
System.DebugLog(jws2.LastErrorText)
Return
End If
If (v = 0) Then
System.DebugLog("Invalid signature. The RSA key was incorrect, the JWS was invalid, or both.")
Return
End If
// If we get here, the signature was validated..
System.DebugLog("Signature validated.")
// Recover the original content:
System.DebugLog(jws2.GetPayload("utf-8"))
// Examine the protected header:
Dim joseHeader As New Chilkat.JsonObject
success = jws2.GetProtectedH(signatureIndex,joseHeader)
joseHeader.EmitCompact = False
System.DebugLog("Protected (JOSE) header:")
System.DebugLog(joseHeader.Emit())
// Output:
// Signature validated.
// In our village, folks say God crumbles up the old moon into stars.
// Protected (JOSE) header:
// {
// "alg": "PS256"
// }