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rct: make the amount key derivable by a third party with the tx key

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Scheme design from luigi1114.
This commit is contained in:
moneromooo-monero
2016-07-24 17:53:34 +01:00
parent cf33e1a52a
commit 9b70856ccb
12 changed files with 141 additions and 93 deletions
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22
src/ringct/rctOps.cpp
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@@ -741,22 +741,28 @@ void fe_mul(fe h,const fe f,const fe g)
//Elliptic Curve Diffie Helman: encodes and decodes the amount b and mask a
// where C= aG + bH
void ecdhEncode(ecdhTuple & unmasked, const key & receiverPk) {
key esk;
//compute shared secret
skpkGen(esk, unmasked.senderPk);
key sharedSec1 = hash_to_scalar(scalarmultKey(receiverPk, esk));
void ecdhEncodeFromSharedSecret(ecdhTuple & unmasked, const key & sharedSec1) {
key sharedSec2 = hash_to_scalar(sharedSec1);
//encode
sc_add(unmasked.mask.bytes, unmasked.mask.bytes, sharedSec1.bytes);
sc_add(unmasked.amount.bytes, unmasked.amount.bytes, sharedSec2.bytes);
}
void ecdhDecode(ecdhTuple & masked, const key & receiverSk) {
void ecdhEncode(ecdhTuple & unmasked, const key & receiverPk) {
key esk;
//compute shared secret
key sharedSec1 = hash_to_scalar(scalarmultKey(masked.senderPk, receiverSk));
skpkGen(esk, unmasked.senderPk);
key sharedSec1 = hash_to_scalar(scalarmultKey(receiverPk, esk));
ecdhEncodeFromSharedSecret(unmasked, sharedSec1);
}
void ecdhDecodeFromSharedSecret(ecdhTuple & masked, const key & sharedSec1) {
key sharedSec2 = hash_to_scalar(sharedSec1);
//encode
//decode
sc_sub(masked.mask.bytes, masked.mask.bytes, sharedSec1.bytes);
sc_sub(masked.amount.bytes, masked.amount.bytes, sharedSec2.bytes);
}
void ecdhDecode(ecdhTuple & masked, const key & receiverSk) {
//compute shared secret
key sharedSec1 = hash_to_scalar(scalarmultKey(masked.senderPk, receiverSk));
ecdhDecodeFromSharedSecret(masked, sharedSec1);
}
}