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(Unicode C) Ed25519ph Sign and VerifyDemonstrates how to create an Ed25519ph signature, and then to verify it. Note: This example requires Chilkat v9.5.0.91 or greater.
#include <C_CkPrivateKeyW.h> #include <C_CkBinDataW.h> #include <C_CkEdDSAW.h> #include <C_CkPublicKeyW.h> void ChilkatSample(void) { const wchar_t *privKeyHex; const wchar_t *pubKeyHex; HCkPrivateKeyW privKey; BOOL success; HCkBinDataW bd; HCkEdDSAW eddsa; const wchar_t *hexSig; HCkPublicKeyW pubKey; BOOL bVerified; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // Use the following test vector from https://www.rfc-editor.org/rfc/rfc8032#page-30 // -----TEST abc // // ALGORITHM: // Ed25519ph // // SECRET KEY: // 833fe62409237b9d62ec77587520911e // 9a759cec1d19755b7da901b96dca3d42 // // PUBLIC KEY: // ec172b93ad5e563bf4932c70e1245034 // c35467ef2efd4d64ebf819683467e2bf // // MESSAGE (length 3 bytes): // 616263 // // SIGNATURE: // 98a70222f0b8121aa9d30f813d683f80 // 9e462b469c7ff87639499bb94e6dae41 // 31f85042463c2a355a2003d062adf5aa // a10b8c61e636062aaad11c2a26083406 privKeyHex = L"833fe62409237b9d62ec77587520911e9a759cec1d19755b7da901b96dca3d42"; pubKeyHex = L"ec172b93ad5e563bf4932c70e1245034c35467ef2efd4d64ebf819683467e2bf"; privKey = CkPrivateKeyW_Create(); success = CkPrivateKeyW_LoadEd25519(privKey,privKeyHex,pubKeyHex); if (success == FALSE) { wprintf(L"%s\n",CkPrivateKeyW_lastErrorText(privKey)); CkPrivateKeyW_Dispose(privKey); return; } // The data to be signed... bd = CkBinDataW_Create(); CkBinDataW_AppendEncoded(bd,L"616263",L"hex"); eddsa = CkEdDSAW_Create(); // Indicate we want the Ed25519ph instance. CkEdDSAW_putAlgorithm(eddsa,L"Ed25519ph"); hexSig = CkEdDSAW_signBdENC(eddsa,bd,L"hexlower",privKey); wprintf(L"signature = %s\n",hexSig); // The expected output is: 98a70222f0b8121aa9d30f813d683f80.... // Verify the signature.. pubKey = CkPublicKeyW_Create(); success = CkPublicKeyW_LoadEd25519(pubKey,pubKeyHex); if (success == FALSE) { wprintf(L"%s\n",CkPublicKeyW_lastErrorText(pubKey)); CkPrivateKeyW_Dispose(privKey); CkBinDataW_Dispose(bd); CkEdDSAW_Dispose(eddsa); CkPublicKeyW_Dispose(pubKey); return; } bVerified = CkEdDSAW_VerifyBdENC(eddsa,bd,hexSig,L"hexlower",pubKey); if (bVerified == FALSE) { wprintf(L"%s\n",CkEdDSAW_lastErrorText(eddsa)); wprintf(L"Failed to verify the signature.\n"); CkPrivateKeyW_Dispose(privKey); CkBinDataW_Dispose(bd); CkEdDSAW_Dispose(eddsa); CkPublicKeyW_Dispose(pubKey); return; } wprintf(L"The Ed25519ph signature is verified!\n"); CkPrivateKeyW_Dispose(privKey); CkBinDataW_Dispose(bd); CkEdDSAW_Dispose(eddsa); CkPublicKeyW_Dispose(pubKey); } |
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