C
C
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 C Downloads
#include <C_CkStringBuilder.h>
#include <C_CkPrivateKey.h>
#include <C_CkJsonObject.h>
#include <C_CkJws.h>
#include <C_CkPublicKey.h>
void ChilkatSample(void)
{
BOOL success;
HCkStringBuilder sbJwk;
HCkPrivateKey rsaKey;
HCkJsonObject jwsProtHdr;
HCkJws jws;
int signatureIndex;
BOOL bIncludeBom;
const char *payloadStr;
const char *jwsCompact;
HCkJws jws2;
HCkPublicKey rsaPubKey;
int v;
HCkJsonObject joseHeader;
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.
sbJwk = CkStringBuilder_Create();
CkStringBuilder_Append(sbJwk,"{\"kty\":\"RSA\",");
CkStringBuilder_Append(sbJwk,"\"n\":\"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx");
CkStringBuilder_Append(sbJwk,"HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs");
CkStringBuilder_Append(sbJwk,"D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH");
CkStringBuilder_Append(sbJwk,"SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV");
CkStringBuilder_Append(sbJwk,"MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8");
CkStringBuilder_Append(sbJwk,"NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ\",");
CkStringBuilder_Append(sbJwk,"\"e\":\"AQAB\",");
CkStringBuilder_Append(sbJwk,"\"d\":\"Eq5xpGnNCivDflJsRQBXHx1hdR1k6Ulwe2JZD50LpXyWPEAeP88vLNO97I");
CkStringBuilder_Append(sbJwk,"jlA7_GQ5sLKMgvfTeXZx9SE-7YwVol2NXOoAJe46sui395IW_GO-pWJ1O0");
CkStringBuilder_Append(sbJwk,"BkTGoVEn2bKVRUCgu-GjBVaYLU6f3l9kJfFNS3E0QbVdxzubSu3Mkqzjkn");
CkStringBuilder_Append(sbJwk,"439X0M_V51gfpRLI9JYanrC4D4qAdGcopV_0ZHHzQlBjudU2QvXt4ehNYT");
CkStringBuilder_Append(sbJwk,"CBr6XCLQUShb1juUO1ZdiYoFaFQT5Tw8bGUl_x_jTj3ccPDVZFD9pIuhLh");
CkStringBuilder_Append(sbJwk,"BOneufuBiB4cS98l2SR_RQyGWSeWjnczT0QU91p1DhOVRuOopznQ\",");
CkStringBuilder_Append(sbJwk,"\"p\":\"4BzEEOtIpmVdVEZNCqS7baC4crd0pqnRH_5IB3jw3bcxGn6QLvnEtfdUdi");
CkStringBuilder_Append(sbJwk,"YrqBdss1l58BQ3KhooKeQTa9AB0Hw_Py5PJdTJNPY8cQn7ouZ2KKDcmnPG");
CkStringBuilder_Append(sbJwk,"BY5t7yLc1QlQ5xHdwW1VhvKn-nXqhJTBgIPgtldC-KDV5z-y2XDwGUc\",");
CkStringBuilder_Append(sbJwk,"\"q\":\"uQPEfgmVtjL0Uyyx88GZFF1fOunH3-7cepKmtH4pxhtCoHqpWmT8YAmZxa");
CkStringBuilder_Append(sbJwk,"ewHgHAjLYsp1ZSe7zFYHj7C6ul7TjeLQeZD_YwD66t62wDmpe_HlB-TnBA");
CkStringBuilder_Append(sbJwk,"-njbglfIsRLtXlnDzQkv5dTltRJ11BKBBypeeF6689rjcJIDEz9RWdc\",");
CkStringBuilder_Append(sbJwk,"\"dp\":\"BwKfV3Akq5_MFZDFZCnW-wzl-CCo83WoZvnLQwCTeDv8uzluRSnm71I3Q");
CkStringBuilder_Append(sbJwk,"CLdhrqE2e9YkxvuxdBfpT_PI7Yz-FOKnu1R6HsJeDCjn12Sk3vmAktV2zb");
CkStringBuilder_Append(sbJwk,"34MCdy7cpdTh_YVr7tss2u6vneTwrA86rZtu5Mbr1C1XsmvkxHQAdYo0\",");
CkStringBuilder_Append(sbJwk,"\"dq\":\"h_96-mK1R_7glhsum81dZxjTnYynPbZpHziZjeeHcXYsXaaMwkOlODsWa");
CkStringBuilder_Append(sbJwk,"7I9xXDoRwbKgB719rrmI2oKr6N3Do9U0ajaHF-NKJnwgjMd2w9cjz3_-ky");
CkStringBuilder_Append(sbJwk,"NlxAr2v4IKhGNpmM5iIgOS1VZnOZ68m6_pbLBSp3nssTdlqvd0tIiTHU\",");
CkStringBuilder_Append(sbJwk,"\"qi\":\"IYd7DHOhrWvxkwPQsRM2tOgrjbcrfvtQJipd-DlcxyVuuM9sQLdgjVk2o");
CkStringBuilder_Append(sbJwk,"y26F0EmpScGLq2MowX7fhd_QJQ3ydy5cY7YIBi87w93IKLEdfnbJtoOPLU");
CkStringBuilder_Append(sbJwk,"W0ITrJReOgo1cq9SbsxYawBgfp_gh6A5603k2-ZQwVK0JKSHuLFkuQ3U\"");
CkStringBuilder_Append(sbJwk,"}");
rsaKey = CkPrivateKey_Create();
// 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_LoadJwk(rsaKey,CkStringBuilder_getAsString(sbJwk));
if (success == FALSE) {
printf("%s\n",CkPrivateKey_lastErrorText(rsaKey));
CkStringBuilder_Dispose(sbJwk);
CkPrivateKey_Dispose(rsaKey);
return;
}
// Create the JWS Protected Header
jwsProtHdr = CkJsonObject_Create();
CkJsonObject_AppendString(jwsProtHdr,"alg","PS256");
jws = CkJws_Create();
// Set the protected header:
signatureIndex = 0;
CkJws_SetProtectedHeader(jws,signatureIndex,jwsProtHdr);
// Set the RSA key:
CkJws_SetPrivateKey(jws,signatureIndex,rsaKey);
// Set the payload.
bIncludeBom = FALSE;
payloadStr = "In our village, folks say God crumbles up the old moon into stars.";
CkJws_SetPayload(jws,payloadStr,"utf-8",bIncludeBom);
// Create the JWS
// By default, the compact serialization is used.
jwsCompact = CkJws_createJws(jws);
if (CkJws_getLastMethodSuccess(jws) == FALSE) {
printf("%s\n",CkJws_lastErrorText(jws));
CkStringBuilder_Dispose(sbJwk);
CkPrivateKey_Dispose(rsaKey);
CkJsonObject_Dispose(jwsProtHdr);
CkJws_Dispose(jws);
return;
}
printf("JWS: %s\n",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 = CkJws_Create();
// Load the JWS.
success = CkJws_LoadJws(jws2,jwsCompact);
rsaPubKey = CkPublicKey_Create();
CkPrivateKey_ToPublicKey(rsaKey,rsaPubKey);
// Set the RSA public key used for validation.
signatureIndex = 0;
CkJws_SetPublicKey(jws2,signatureIndex,rsaPubKey);
// Validate the 1st (and only) signature at index 0..
v = CkJws_Validate(jws2,signatureIndex);
if (v < 0) {
// Perhaps Chilkat was not unlocked or the trial expired..
printf("Method call failed for some other reason.\n");
printf("%s\n",CkJws_lastErrorText(jws2));
CkStringBuilder_Dispose(sbJwk);
CkPrivateKey_Dispose(rsaKey);
CkJsonObject_Dispose(jwsProtHdr);
CkJws_Dispose(jws);
CkJws_Dispose(jws2);
CkPublicKey_Dispose(rsaPubKey);
return;
}
if (v == 0) {
printf("Invalid signature. The RSA key was incorrect, the JWS was invalid, or both.\n");
CkStringBuilder_Dispose(sbJwk);
CkPrivateKey_Dispose(rsaKey);
CkJsonObject_Dispose(jwsProtHdr);
CkJws_Dispose(jws);
CkJws_Dispose(jws2);
CkPublicKey_Dispose(rsaPubKey);
return;
}
// If we get here, the signature was validated..
printf("Signature validated.\n");
// Recover the original content:
printf("%s\n",CkJws_getPayload(jws2,"utf-8"));
// Examine the protected header:
joseHeader = CkJsonObject_Create();
CkJws_GetProtectedH(jws2,signatureIndex,joseHeader);
CkJsonObject_putEmitCompact(joseHeader,FALSE);
printf("Protected (JOSE) header:\n");
printf("%s\n",CkJsonObject_emit(joseHeader));
// Output:
// Signature validated.
// In our village, folks say God crumbles up the old moon into stars.
// Protected (JOSE) header:
// {
// "alg": "PS256"
// }
CkStringBuilder_Dispose(sbJwk);
CkPrivateKey_Dispose(rsaKey);
CkJsonObject_Dispose(jwsProtHdr);
CkJws_Dispose(jws);
CkJws_Dispose(jws2);
CkPublicKey_Dispose(rsaPubKey);
CkJsonObject_Dispose(joseHeader);
}