/*
* Encode to/from byteRep.
*/
static void ECDSA_encode(
feeSigFormat format, // Signature format DER 9.62 / RAW
unsigned groupBytesLen,
giant c,
giant d,
unsigned char **sigData, // malloc'd and RETURNED
unsigned *sigDataLen) // RETURNED
{
#if CRYPTKIT_DER_ENABLE
if (format==FSF_RAW) {
feeRAWEncodeECDSASignature(groupBytesLen,c, d, sigData, sigDataLen);
} else {
feeDEREncodeECDSASignature(c, d, sigData, sigDataLen);
}
#else
*sigDataLen = lengthOfByteRepSig(c, d);
*sigData = (unsigned char*) fmalloc(*sigDataLen);
sigToByteRep(FEE_ECDSA_MAGIC,
FEE_ECDSA_VERSION,
FEE_ECDSA_VERSION_MIN,
c,
d,
*sigData);
#endif
}
/*
* For given key, calculate maximum signature size.
*/
feeReturn feeSigSize(
feePubKey pubKey,
unsigned *maxSigLen)
{
/* For now, assume that u and Pm.x in the signature are
* same size as the key's associated curveParams->basePrime.
* We might have to pad this a bit....
*/
curveParams *cp = feePubKeyCurveParams(pubKey);
if(cp == NULL) {
return FR_BadPubKey;
}
#if CRYPTKIT_DER_ENABLE
*maxSigLen = feeSizeOfDERSig(cp->basePrime, cp->basePrime);
#else
*maxSigLen = (unsigned)lengthOfByteRepSig(cp->basePrime, cp->basePrime);
#endif
return FR_Success;
}
/*
* Given a feeSig processed by feeSigSign, obtain a malloc'd byte
* array representing the signature.
* See ByteRep.doc for info on the format of the signature string;
* PLEASE UPDATE THIS DOCUMENT WHEN YOU MAKE CHANGES TO THE STRING FORMAT.
*/
feeReturn feeSigData(feeSig sig,
unsigned char **sigData, // IGNORED....malloc'd and RETURNED
unsigned *sigDataLen) // RETURNED
{
sigInst *sinst = (sigInst*) sig;
#if CRYPTKIT_DER_ENABLE
return feeDEREncodeElGamalSignature(sinst->u, sinst->PmX, sigData, sigDataLen);
#else
*sigDataLen = lengthOfByteRepSig(sinst->u, sinst->PmX);
*sigData = (unsigned char*) fmalloc(*sigDataLen);
sigToByteRep(FEE_SIG_MAGIC,
FEE_SIG_VERSION,
FEE_SIG_VERSION_MIN,
sinst->u,
sinst->PmX,
*sigData);
return FR_Success;
#endif
}
