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(Unicode C) Create a JWS Using ECDSA P-521 SHA-512Creates and verifies a JSON Web Signature (JWS) that uses ECDSA P-521 SHA-512 Note: This example requires Chilkat v9.5.0.66 or greater.
#include <C_CkStringBuilderW.h> #include <C_CkPrivateKeyW.h> #include <C_CkJsonObjectW.h> #include <C_CkJwsW.h> #include <C_CkPublicKeyW.h> void ChilkatSample(void) { HCkStringBuilderW sbJwk; HCkPrivateKeyW eccKey; BOOL success; HCkJsonObjectW jwsProtHdr; HCkJwsW jws; int signatureIndex; BOOL bIncludeBom; const wchar_t *payloadStr; const wchar_t *jwsCompact; HCkJwsW jws2; HCkPublicKeyW eccPubKey; int v; HCkJsonObjectW 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. // Use the following ECC key loaded from JWK format. sbJwk = CkStringBuilderW_Create(); CkStringBuilderW_Append(sbJwk,L"{\"kty\":\"EC\","); CkStringBuilderW_Append(sbJwk,L"\"crv\":\"P-521\","); CkStringBuilderW_Append(sbJwk,L"\"x\":\"AekpBQ8ST8a8VcfVOTNl353vSrDCLLJXmPk06wTjxrrjcBpXp5EOnYG_NjFZ6OvLFV1jSfS9tsz4qUxcWceqwQGk\","); CkStringBuilderW_Append(sbJwk,L"\"y\":\"ADSmRA43Z1DSNx_RvcLI87cdL07l6jQyyBXMoxVg_l2Th-x3S1WDhjDly79ajL4Kkd0AZMaZmh9ubmf63e3kyMj2\","); CkStringBuilderW_Append(sbJwk,L"\"d\":\"AY5pb7A0UFiB3RELSD64fTLOSV_jazdF7fLYyuTw8lOfRhWg6Y6rUrPAxerEzgdRhajnu0ferB0d53vM9mE15j2C\""); CkStringBuilderW_Append(sbJwk,L"}"); eccKey = CkPrivateKeyW_Create(); // Note: This example loads the ECDSA key from JWK format. Any format can be loaded // into the private key object. (See the online reference documentation..) success = CkPrivateKeyW_LoadJwk(eccKey,CkStringBuilderW_getAsString(sbJwk)); if (success != TRUE) { wprintf(L"%s\n",CkPrivateKeyW_lastErrorText(eccKey)); CkStringBuilderW_Dispose(sbJwk); CkPrivateKeyW_Dispose(eccKey); return; } // Create the JWS Protected Header jwsProtHdr = CkJsonObjectW_Create(); CkJsonObjectW_AppendString(jwsProtHdr,L"alg",L"ES512"); jws = CkJwsW_Create(); // Set the protected header: signatureIndex = 0; CkJwsW_SetProtectedHeader(jws,signatureIndex,jwsProtHdr); // Set the ECC key: CkJwsW_SetPrivateKey(jws,signatureIndex,eccKey); // Set the payload. bIncludeBom = FALSE; payloadStr = L"In our village, folks say God crumbles up the old moon into stars."; CkJwsW_SetPayload(jws,payloadStr,L"utf-8",bIncludeBom); // Create the JWS // By default, the compact serialization is used. jwsCompact = CkJwsW_createJws(jws); if (CkJwsW_getLastMethodSuccess(jws) != TRUE) { wprintf(L"%s\n",CkJwsW_lastErrorText(jws)); CkStringBuilderW_Dispose(sbJwk); CkPrivateKeyW_Dispose(eccKey); CkJsonObjectW_Dispose(jwsProtHdr); CkJwsW_Dispose(jws); return; } wprintf(L"JWS: %s\n",jwsCompact); // Note: ECC signatures use random values, so the output will be different each time a signature is produced. // sample output: // JWS: eyJhbGciOiJFUzUxMiJ9.SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu.AFOnOtZ8UTp-ed1PfLfXxwGU7zT_jnmGGxew-d1CP6SfKa5RUhav5mF4szhSof22JaoQ742VIa0eZ0s1rhBnj8y6APr6g6vKzIpYZlJsnjzjUwAjDQOLmcsjxrrRfATh-NEv7G0Z9FrjdJasS44tCG2EnG6aT2TW-sPG0dy5o9jUWCzi // Now load the JWS, validate, and recover the original text. jws2 = CkJwsW_Create(); // Load the JWS. success = CkJwsW_LoadJws(jws2,jwsCompact); eccPubKey = CkPrivateKeyW_GetPublicKey(eccKey); // Set the ECC public key used for validation. signatureIndex = 0; CkJwsW_SetPublicKey(jws2,signatureIndex,eccPubKey); CkPublicKeyW_Dispose(eccPubKey); // Validate the 1st (and only) signature at index 0.. v = CkJwsW_Validate(jws2,signatureIndex); if (v < 0) { // Perhaps Chilkat was not unlocked or the trial expired.. wprintf(L"Method call failed for some other reason.\n"); wprintf(L"%s\n",CkJwsW_lastErrorText(jws2)); CkStringBuilderW_Dispose(sbJwk); CkPrivateKeyW_Dispose(eccKey); CkJsonObjectW_Dispose(jwsProtHdr); CkJwsW_Dispose(jws); CkJwsW_Dispose(jws2); return; } if (v == 0) { wprintf(L"Invalid signature. The ECC key was incorrect, the JWS was invalid, or both.\n"); CkStringBuilderW_Dispose(sbJwk); CkPrivateKeyW_Dispose(eccKey); CkJsonObjectW_Dispose(jwsProtHdr); CkJwsW_Dispose(jws); CkJwsW_Dispose(jws2); return; } // If we get here, the signature was validated.. wprintf(L"Signature validated.\n"); // Recover the original content: wprintf(L"%s\n",CkJwsW_getPayload(jws2,L"utf-8")); // Examine the protected header: joseHeader = CkJwsW_GetProtectedHeader(jws2,signatureIndex); if (CkJwsW_getLastMethodSuccess(jws2) != TRUE) { wprintf(L"No protected header found at the given index.\n"); CkStringBuilderW_Dispose(sbJwk); CkPrivateKeyW_Dispose(eccKey); CkJsonObjectW_Dispose(jwsProtHdr); CkJwsW_Dispose(jws); CkJwsW_Dispose(jws2); return; } CkJsonObjectW_putEmitCompact(joseHeader,FALSE); wprintf(L"Protected (JOSE) header:\n"); wprintf(L"%s\n",CkJsonObjectW_emit(joseHeader)); CkJsonObjectW_Dispose(joseHeader); // Output: // Signature validated. // In our village, folks say God crumbles up the old moon into stars. // Protected (JOSE) header: // { // "alg": "ES512" // } CkStringBuilderW_Dispose(sbJwk); CkPrivateKeyW_Dispose(eccKey); CkJsonObjectW_Dispose(jwsProtHdr); CkJwsW_Dispose(jws); CkJwsW_Dispose(jws2); } |
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