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Random time lock script generator

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This commit is contained in:
Michael Toutonghi
2018-04-14 21:35:46 -07:00
parent 3eb69544f7
commit dba84931d4
1 changed files with 50 additions and 6 deletions
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56
src/komodo_utils.h
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@@ -1044,7 +1044,7 @@ int32_t komodo_opreturnscript(uint8_t *script,uint8_t type,uint8_t *opret,int32_
#define SCRIPT_OP_CHECKLOCKTIMEVERIFY 0xb1
#define SCRIPT_OP_DROP 0x75
// returns a standard spend script
// standard spend script
int32_t komodo_standardspend(uint8_t *script,int32_t n,uint8_t rmd160[20])
{
script[n++] = SCRIPT_OP_DUP;
@@ -1055,7 +1055,7 @@ int32_t komodo_standardspend(uint8_t *script,int32_t n,uint8_t rmd160[20])
return(n);
}
// returns a check lock time verify script to ensure that the UTXO cannot be spent
// check lock time verify script to ensure that the UTXO cannot be spent
// until the specified lock time
int32_t komodo_checklocktimeverify(uint8_t *script,int32_t n,uint32_t locktime)
{
@@ -1069,15 +1069,59 @@ int32_t komodo_checklocktimeverify(uint8_t *script,int32_t n,uint32_t locktime)
return(n);
}
// returns a script that cannot be spent until the specified lock time by the specified
// address hash
int32_t komodo_timelockspend(uint8_t *script,int32_t n,uint8_t rmd160[20],uint32_t timestamp)
// combined CLTV script and standard spend
int32_t komodo_timelockspend(uint8_t *script,int32_t n,uint8_t rmd160[20],uint32_t locktime)
{
n = komodo_checklocktimeverify(script,n,timestamp);
n = komodo_checklocktimeverify(script,n,locktime);
n = komodo_standardspend(script,n,rmd160);
return(n);
}
// get a pseudo random number that is the same for each block individually at all times and different
// from all other blocks. the sequence is extremely likely, but not guaranteed to be unique for each block chain
uint64_t blockPRG(uint32_t nHeight)
{
int i;
uint8_t hashSrc[8];
uint32_t result = 0;
uint64_t hashSrc64 = ASSETCHAINS_MAGIC << 32 + nHeight;
bits256 hashResult;
for ( i = 0; i < sizeof(hashSrc); i++ )
{
hashSrc[i] = hashSrc64 & 0xff;
hashSrc64 >>= 8;
}
vcalc_sha256(0,hashResult.bytes,hashSrc,sizeof(hashSrc));
for ( i = 0; i < sizeof(hashResult.uints) >> 2; i++ )
{
result ^= hashResult.uints[i];
}
return(result);
}
// create a CLTV output script and return the script and its P2SH address
// funds will be locked a pseudo random time between specified from and to time, with entropy taken from the parameters used
// to setup the chain and the specified block height. this can be used to create, validate, or spend a time locked coin base transaction
int64_t komodo_block_timelockscript(uint8_t *script, uint8_t p2sh160[20], uint8_t taddrrmd160[20], uint32_t nHeight, uint64_t fromTime, uint64_t toTime)
{
uint32_t locktime, n = 0;
if ( toTime < fromTime )
return(0);
else if ( toTime == fromTime )
locktime = toTime;
else
{
locktime = fromTime + blockPRG(nHeight) / (0xffffffffffffffff / ((toTime - fromTime) + 1));
}
n = komodo_timelockspend(script, n, taddrrmd160, locktime);
calc_rmd160_sha256(p2sh160, script, n);
return(locktime);
}
long _stripwhite(char *buf,int accept)
{
int32_t i,j,c;