82 lines
2.4 KiB
Plaintext
82 lines
2.4 KiB
Plaintext
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include "constants.circom";
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include "sha256compression.circom";
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template Sha256(nBits) {
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signal input in[nBits];
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signal output out[256];
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var i;
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var k;
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var nBlocks;
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var bitsLastBlock;
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nBlocks = ((nBits + 64)\512)+1;
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signal paddedIn[nBlocks*512];
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for (k=0; k<nBits; k++) {
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paddedIn[k] <== in[k];
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}
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paddedIn[nBits] <== 1;
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for (k=nBits+1; k<nBlocks*512-64; k++) {
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paddedIn[k] <== 0;
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}
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for (k = 0; k< 64; k++) {
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paddedIn[nBlocks*512 - k -1] <== (nBits >> k)&1;
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}
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component ha0 = H(0);
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component hb0 = H(1);
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component hc0 = H(2);
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component hd0 = H(3);
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component he0 = H(4);
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component hf0 = H(5);
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component hg0 = H(6);
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component hh0 = H(7);
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component sha256compression[nBlocks];
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for (i=0; i<nBlocks; i++) {
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sha256compression[i] = Sha256compression() ;
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if (i==0) {
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for (k=0; k<32; k++ ) {
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sha256compression[i].hin[0*32+k] <== ha0.out[k];
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sha256compression[i].hin[1*32+k] <== hb0.out[k];
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sha256compression[i].hin[2*32+k] <== hc0.out[k];
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sha256compression[i].hin[3*32+k] <== hd0.out[k];
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sha256compression[i].hin[4*32+k] <== he0.out[k];
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sha256compression[i].hin[5*32+k] <== hf0.out[k];
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sha256compression[i].hin[6*32+k] <== hg0.out[k];
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sha256compression[i].hin[7*32+k] <== hh0.out[k];
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}
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} else {
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for (k=0; k<32; k++ ) {
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sha256compression[i].hin[32*0+k] <== sha256compression[i-1].out[32*0+31-k];
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sha256compression[i].hin[32*1+k] <== sha256compression[i-1].out[32*1+31-k];
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sha256compression[i].hin[32*2+k] <== sha256compression[i-1].out[32*2+31-k];
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sha256compression[i].hin[32*3+k] <== sha256compression[i-1].out[32*3+31-k];
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sha256compression[i].hin[32*4+k] <== sha256compression[i-1].out[32*4+31-k];
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sha256compression[i].hin[32*5+k] <== sha256compression[i-1].out[32*5+31-k];
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sha256compression[i].hin[32*6+k] <== sha256compression[i-1].out[32*6+31-k];
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sha256compression[i].hin[32*7+k] <== sha256compression[i-1].out[32*7+31-k];
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}
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}
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for (k=0; k<512; k++) {
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sha256compression[i].inp[k] <== paddedIn[i*512+k];
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}
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}
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for (k=0; k<256; k++) {
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out[k] <== sha256compression[nBlocks-1].out[k];
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}
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}
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