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(C) Validate a JWS Using ECDSA P-256 SHA-256Validates a JSON Web Signature (JWS) that uses ECDSA P-256 SHA-256 Note: This example requires Chilkat v9.5.0.66 or greater.
#include <C_CkStringBuilder.h> #include <C_CkPublicKey.h> #include <C_CkJws.h> #include <C_CkJsonObject.h> void ChilkatSample(void) { HCkStringBuilder sbPubKey; HCkPublicKey pubKey; BOOL success; HCkJws jws; int signatureIndex; HCkStringBuilder sbJws; int v; HCkJsonObject joseHeader; // 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. // This example takes a JSON signature in compact serialization format, // and uses an ECDSA public key to validate and recover the protected header and payload. // We only need a public key for signature validation. This is the ECDSA public key // that is used: // {"kty":"EC", // "crv":"P-256", // "x":"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU", // "y":"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0" // } sbPubKey = CkStringBuilder_Create(); CkStringBuilder_Append(sbPubKey,"{\"kty\":\"EC\","); CkStringBuilder_Append(sbPubKey,"\"crv\":\"P-256\","); CkStringBuilder_Append(sbPubKey,"\"x\":\"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU\","); CkStringBuilder_Append(sbPubKey,"\"y\":\"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0\""); CkStringBuilder_Append(sbPubKey,"}"); pubKey = CkPublicKey_Create(); success = CkPublicKey_LoadFromString(pubKey,CkStringBuilder_getAsString(sbPubKey)); if (success != TRUE) { printf("%s\n",CkPublicKey_lastErrorText(pubKey)); CkStringBuilder_Dispose(sbPubKey); CkPublicKey_Dispose(pubKey); return; } jws = CkJws_Create(); // Set the ECC public key: signatureIndex = 0; CkJws_SetPublicKey(jws,signatureIndex,pubKey); // Load the JWS. sbJws = CkStringBuilder_Create(); CkStringBuilder_Append(sbJws,"eyJhbGciOiJFUzI1NiJ9"); CkStringBuilder_Append(sbJws,"."); CkStringBuilder_Append(sbJws,"eyJpc3MiOiJqb2UiLA0KICJleHAiOjEzMDA4MTkzODAsDQogImh0dHA6Ly9leGFt"); CkStringBuilder_Append(sbJws,"cGxlLmNvbS9pc19yb290Ijp0cnVlfQ"); CkStringBuilder_Append(sbJws,"."); CkStringBuilder_Append(sbJws,"DtEhU3ljbEg8L38VWAfUAqOyKAM6-Xx-F4GawxaepmXFCgfTjDxw5djxLa8ISlSA"); CkStringBuilder_Append(sbJws,"pmWQxfKTUJqPP3-Kg6NU1Q"); success = CkJws_LoadJwsSb(jws,sbJws); if (success != TRUE) { printf("%s\n",CkJws_lastErrorText(jws)); CkStringBuilder_Dispose(sbPubKey); CkPublicKey_Dispose(pubKey); CkJws_Dispose(jws); CkStringBuilder_Dispose(sbJws); return; } // Validate the 1st (and only) signature at index 0.. v = CkJws_Validate(jws,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(jws)); CkStringBuilder_Dispose(sbPubKey); CkPublicKey_Dispose(pubKey); CkJws_Dispose(jws); CkStringBuilder_Dispose(sbJws); return; } if (v == 0) { printf("Invalid signature. The ECC key was incorrect, the JWS was invalid, or both.\n"); CkStringBuilder_Dispose(sbPubKey); CkPublicKey_Dispose(pubKey); CkJws_Dispose(jws); CkStringBuilder_Dispose(sbJws); return; } // If we get here, the signature was validated.. printf("Signature validated.\n"); printf("--\n"); // Recover the original content: printf("Recovered content:\n"); printf("%s\n",CkJws_getPayload(jws,"utf-8")); printf("--\n"); // Examine the protected header: joseHeader = CkJws_GetProtectedHeader(jws,signatureIndex); if (CkJws_getLastMethodSuccess(jws) != TRUE) { printf("No protected header found at the given index.\n"); CkStringBuilder_Dispose(sbPubKey); CkPublicKey_Dispose(pubKey); CkJws_Dispose(jws); CkStringBuilder_Dispose(sbJws); return; } CkJsonObject_putEmitCompact(joseHeader,FALSE); printf("Protected (JOSE) header:\n"); printf("%s\n",CkJsonObject_emit(joseHeader)); CkJsonObject_Dispose(joseHeader); // Output: // Signature validated. // -- // Recovered content: // {"iss":"joe", // "exp":1300819380, // "http://example.com/is_root":true} // -- // Protected (JOSE) header: // { // "alg": "ES256" // } CkStringBuilder_Dispose(sbPubKey); CkPublicKey_Dispose(pubKey); CkJws_Dispose(jws); CkStringBuilder_Dispose(sbJws); } |
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