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Enforce first four bits are zero for all spending keys and phi.

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This commit is contained in:
Sean Bowe
2016-05-16 09:50:31 -06:00
parent 4ac1841614
commit defe37a6d4
15 changed files with 123 additions and 42 deletions
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14
src/zcash/prf.cpp
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@@ -2,7 +2,7 @@
#include "crypto/sha256.h"
uint256 PRF(bool a, bool b, bool c, bool d,
const uint256& x,
const uint252& x,
const uint256& y)
{
uint256 res;
@@ -21,7 +21,7 @@ uint256 PRF(bool a, bool b, bool c, bool d,
return res;
}
uint256 PRF_addr(const uint256& a_sk, unsigned char t)
uint256 PRF_addr(const uint252& a_sk, unsigned char t)
{
uint256 y;
*(y.begin()) = t;
@@ -29,22 +29,22 @@ uint256 PRF_addr(const uint256& a_sk, unsigned char t)
return PRF(1, 1, 0, 0, a_sk, y);
}
uint256 PRF_addr_a_pk(const uint256& a_sk)
uint256 PRF_addr_a_pk(const uint252& a_sk)
{
return PRF_addr(a_sk, 0);
}
uint256 PRF_addr_sk_enc(const uint256& a_sk)
uint256 PRF_addr_sk_enc(const uint252& a_sk)
{
return PRF_addr(a_sk, 1);
}
uint256 PRF_nf(const uint256& a_sk, const uint256& rho)
uint256 PRF_nf(const uint252& a_sk, const uint256& rho)
{
return PRF(1, 1, 1, 0, a_sk, rho);
}
uint256 PRF_pk(const uint256& a_sk, size_t i0, const uint256& h_sig)
uint256 PRF_pk(const uint252& a_sk, size_t i0, const uint256& h_sig)
{
if ((i0 != 0) && (i0 != 1)) {
throw std::domain_error("PRF_pk invoked with index out of bounds");
@@ -53,7 +53,7 @@ uint256 PRF_pk(const uint256& a_sk, size_t i0, const uint256& h_sig)
return PRF(0, i0, 0, 0, a_sk, h_sig);
}
uint256 PRF_rho(const uint256& phi, size_t i0, const uint256& h_sig)
uint256 PRF_rho(const uint252& phi, size_t i0, const uint256& h_sig)
{
if ((i0 != 0) && (i0 != 1)) {
throw std::domain_error("PRF_rho invoked with index out of bounds");