26 lines
873 B
Plaintext
26 lines
873 B
Plaintext
var [const] MsgHash=Import("zklMsgHash"); // SHA-256, etc
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const symbols="123456789" // 58 characters: no cap i,o; ell, zero
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"ABCDEFGHJKLMNPQRSTUVWXYZ"
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"abcdefghijkmnopqrstuvwxyz";
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fcn unbase58(str){ // --> Data (byte bucket)
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out:=Data().fill(0,25);
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str.pump(Void,symbols.index,'wrap(n){ // throws on out of range
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[24..0,-1].reduce('wrap(c,idx){
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c+=58*out[idx]; // throws if not enough data
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out[idx]=c;
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c/256; // should be zero when done
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},n) : if(_) throw(Exception.ValueError("address too long"));
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});
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out;
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}
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fcn coinValide(addr){
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reg dec,chkSum;
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try{ dec=unbase58(addr) }catch{ return(False) }
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chkSum=dec[-4,*]; dec.del(21,*);
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// hash then hash the hash --> binary hash (instead of hex string)
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(2).reduce(MsgHash.SHA256.fp1(1,dec),dec); // dec is i/o buffer
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dec[0,4]==chkSum;
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}
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