64 lines
1.3 KiB
C++
64 lines
1.3 KiB
C++
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#include "prf.h"
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#include "crypto/sha256.h"
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uint256 PRF(bool a, bool b, bool c, bool d,
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const uint252& x,
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const uint256& y)
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{
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uint256 res;
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unsigned char blob[64];
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memcpy(&blob[0], x.begin(), 32);
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memcpy(&blob[32], y.begin(), 32);
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blob[0] &= 0x0F;
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blob[0] |= (a ? 1 << 7 : 0) | (b ? 1 << 6 : 0) | (c ? 1 << 5 : 0) | (d ? 1 << 4 : 0);
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CSHA256 hasher;
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hasher.Write(blob, 64);
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hasher.FinalizeNoPadding(res.begin());
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return res;
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}
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uint256 PRF_addr(const uint252& a_sk, unsigned char t)
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{
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uint256 y;
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*(y.begin()) = t;
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return PRF(1, 1, 0, 0, a_sk, y);
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}
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uint256 PRF_addr_a_pk(const uint252& a_sk)
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{
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return PRF_addr(a_sk, 0);
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}
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uint256 PRF_addr_sk_enc(const uint252& a_sk)
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{
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return PRF_addr(a_sk, 1);
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}
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uint256 PRF_nf(const uint252& a_sk, const uint256& rho)
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{
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return PRF(1, 1, 1, 0, a_sk, rho);
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}
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uint256 PRF_pk(const uint252& a_sk, size_t i0, const uint256& h_sig)
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{
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if ((i0 != 0) && (i0 != 1)) {
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throw std::domain_error("PRF_pk invoked with index out of bounds");
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}
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return PRF(0, i0, 0, 0, a_sk, h_sig);
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}
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uint256 PRF_rho(const uint252& phi, size_t i0, const uint256& h_sig)
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{
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if ((i0 != 0) && (i0 != 1)) {
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throw std::domain_error("PRF_rho invoked with index out of bounds");
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}
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return PRF(0, i0, 1, 0, phi, h_sig);
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}
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