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ringct: some more small optimizations

This commit is contained in:
moneromooo-monero 2016-10-23 16:10:17 +01:00
parent 4f6ea2eb6a
commit 59f0d4b574
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GPG Key ID: 686F07454D6CEFC3
2 changed files with 25 additions and 58 deletions
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59
src/ringct/rctOps.cpp
View File

@ -37,50 +37,12 @@ namespace rct {
//Various key initialization functions //Various key initialization functions
//Creates a zero scalar
void zero(key &zero) {
memset(&zero, 0, 32);
}
//Creates a zero scalar
key zero() {
static const key z = { {0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 } };
return z;
}
//Creates a zero elliptic curve point
void identity(key &Id) {
Id[0] = (unsigned char)(0x01);
memset(Id.bytes+1, 0, 31);
}
//Creates a zero elliptic curve point
key identity() {
key Id;
Id[0] = (unsigned char)(0x01);
memset(Id.bytes+1, 0, 31);
return Id;
}
//copies a scalar or point
void copy(key &AA, const key &A) {
memcpy(&AA, &A, 32);
}
//copies a scalar or point
key copy(const key &A) {
key AA;
memcpy(&AA, &A, 32);
return AA;
}
//initializes a key matrix; //initializes a key matrix;
//first parameter is rows, //first parameter is rows,
//second is columns //second is columns
keyM keyMInit(int rows, int cols) { keyM keyMInit(size_t rows, size_t cols) {
keyM rv(cols); keyM rv(cols);
int i = 0; size_t i = 0;
for (i = 0 ; i < cols ; i++) { for (i = 0 ; i < cols ; i++) {
rv[i] = keyV(rows); rv[i] = keyV(rows);
} }
@ -107,11 +69,12 @@ namespace rct {
//Generates a vector of secret key //Generates a vector of secret key
//Mainly used in testing //Mainly used in testing
keyV skvGen(int rows ) { keyV skvGen(size_t rows ) {
keyV rv(rows); keyV rv(rows);
int i = 0; size_t i = 0;
crypto::rand(rows * sizeof(key), (uint8_t*)&rv[0]);
for (i = 0 ; i < rows ; i++) { for (i = 0 ; i < rows ; i++) {
skGen(rv[i]); sc_reduce32(rv[i].bytes);
} }
return rv; return rv;
} }
@ -155,7 +118,7 @@ namespace rct {
//generates a <secret , public> / Pedersen commitment but takes bH as input //generates a <secret , public> / Pedersen commitment but takes bH as input
tuple<ctkey, ctkey> ctskpkGen(key bH) { tuple<ctkey, ctkey> ctskpkGen(const key &bH) {
ctkey sk, pk; ctkey sk, pk;
skpkGen(sk.dest, pk.dest); skpkGen(sk.dest, pk.dest);
skpkGen(sk.mask, pk.mask); skpkGen(sk.mask, pk.mask);
@ -172,12 +135,12 @@ namespace rct {
return mask; return mask;
} }
key commit(xmr_amount amount, key mask) { key commit(xmr_amount amount, const key &mask) {
mask = scalarmultBase(mask); key c = scalarmultBase(mask);
key am = d2h(amount); key am = d2h(amount);
key bH = scalarmultH(am); key bH = scalarmultH(am);
addKeys(mask, mask, bH); addKeys(c, c, bH);
return mask; return c;
} }
//generates a random uint long long (for testing) //generates a random uint long long (for testing)

24
src/ringct/rctOps.h
View File

@ -64,19 +64,23 @@ namespace rct {
//Various key initialization functions //Various key initialization functions
static const key Z = { {0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 } };
static const key I = { {0x01, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 } };
//Creates a zero scalar //Creates a zero scalar
key zero(); inline key zero() { return Z; }
void zero(key &z); inline void zero(key &z) { memset(&z, 0, 32); }
//Creates a zero elliptic curve point //Creates a zero elliptic curve point
key identity(); inline key identity() { return I; }
void identity(key &Id); inline void identity(key &Id) { memcpy(&Id, &I, 32); }
//copies a scalar or point //copies a scalar or point
void copy(key &AA, const key &A); inline void copy(key &AA, const key &A) { memcpy(&AA, &A, 32); }
key copy(const key & AA); inline key copy(const key & A) { key AA; memcpy(&AA, &A, 32); return AA; }
//initializes a key matrix; //initializes a key matrix;
//first parameter is rows, //first parameter is rows,
//second is columns //second is columns
keyM keyMInit(int, int); keyM keyMInit(size_t rows, size_t cols);
//Various key generation functions //Various key generation functions
@ -85,7 +89,7 @@ namespace rct {
void skGen(key &); void skGen(key &);
//generates a vector of secret keys of size "int" //generates a vector of secret keys of size "int"
keyV skvGen(int ); keyV skvGen(size_t rows );
//generates a random curve point (for testing) //generates a random curve point (for testing)
key pkGen(); key pkGen();
@ -97,9 +101,9 @@ namespace rct {
//generates C =aG + bH from b, a is random //generates C =aG + bH from b, a is random
void genC(key & C, const key & a, xmr_amount amount); void genC(key & C, const key & a, xmr_amount amount);
//this one is mainly for testing, can take arbitrary amounts.. //this one is mainly for testing, can take arbitrary amounts..
tuple<ctkey, ctkey> ctskpkGen(key bH); tuple<ctkey, ctkey> ctskpkGen(const key &bH);
// make a pedersen commitment with given key // make a pedersen commitment with given key
key commit(xmr_amount amount, key mask); key commit(xmr_amount amount, const key &mask);
// make a pedersen commitment with zero key // make a pedersen commitment with zero key
key zeroCommit(xmr_amount amount); key zeroCommit(xmr_amount amount);
//generates a random uint long long //generates a random uint long long