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rct amount key modified as per luigi1111's recommendations

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This allows the key to be not the same for two outputs sent to
the same address (eg, if you pay yourself, and also get change
back). Also remove the key amounts lists and return parameters
since we don't actually generate random ones, so we don't need
to save them as we can recalculate them when needed if we have
the correct keys.
This commit is contained in:
moneromooo-monero
2016-08-10 12:48:20 +01:00
parent 93f5c625f0
commit d4b62a1e29
15 changed files with 85 additions and 133 deletions
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18
src/ringct/rctOps.cpp
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@@ -741,28 +741,18 @@ 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 ecdhEncodeFromSharedSecret(ecdhTuple & unmasked, const key & sharedSec1) {
void ecdhEncode(ecdhTuple & unmasked, const key & sharedSec) {
key sharedSec1 = hash_to_scalar(sharedSec);
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 ecdhEncode(ecdhTuple & unmasked, const key & receiverPk) {
key esk;
//compute shared secret
skpkGen(esk, unmasked.senderPk);
key sharedSec1 = hash_to_scalar(scalarmultKey(receiverPk, esk));
ecdhEncodeFromSharedSecret(unmasked, sharedSec1);
}
void ecdhDecodeFromSharedSecret(ecdhTuple & masked, const key & sharedSec1) {
void ecdhDecode(ecdhTuple & masked, const key & sharedSec) {
key sharedSec1 = hash_to_scalar(sharedSec);
key sharedSec2 = hash_to_scalar(sharedSec1);
//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);
}
}