circomlib/circuits/mimc.circom

template MiMC7(nrounds) {
    signal input x_in;
    signal input k;
    signal output out;

    var c = [
        0x0000000000000000000000000000000000000000000000000000000000000000,
        0x2573c33972da08a17b379c84ef2ac8f5b1da7feb7a0f65820f5106065947e745,
        0x21ac176a3dfade8c2846270deb9bda2c1fa8fe29504ed1abef144ae541da6fb0,
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        0x248d5e6f74e607401c9bdc79bd5d2e899028fc26e7db9437c7738e60b7a90b37,
        0x0dd9d1bbccd01bb58caf364938ccc55e74953f0ae52ee145beaecbfbe683e777,
        0x0bd18dd6afccd76ae3a159cac4bb1ec1158def927f5b8a529a4697ba3294805b,
        0x00ce7b4a2643c23fab142b955293492bda5b775cea46ef3e9bc803301935d987,
        0x24927ca97213de091fac3153a76dd4dd6c9933b1bc298148ece271dd80623f8d,
        0x035e884c65a79c58a895b27d4ef671b1661dac72281f4c4458ae2a0be14c4555,
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        0x0f5df25a785d5fdfaede0ff3e0853a35f66c8b140ca82b1c7648a1496ba902cd,
        0x1d9177a9c7d2cbcdc6bf2ce3bdb93066598c0c00096084f32a08c00065fcb640,
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        0x1906ec1e76ad9371267a5a206e38b76d446a868c9be4be98a234910865e1b877,
        0x23f62fe89f2a36259878a077482a5f6ff85740e5d8f9d9ffacbb9263b18a86af,
        0x2f4b20c57d3038c70271187292b4a94e56019730dcfdee59ad28bf2371f89b73,
        0x2188c593ba388bb539b6a3e89cf9eec31520abc006e25b21ef0b9ec0ba795ead,
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    ];

    var t;
    signal t2[nrounds];
    signal t4[nrounds];
    signal t6[nrounds];
    signal t7[nrounds-1];

    for (var i=0; i<nrounds; i++) {
        t = (i==0) ? k+x_in : k + t7[i-1] + c[i];
        t2[i] <== t*t;
        t4[i] <== t2[i]*t2[i];
        t6[i] <== t4[i]*t2[i];
        if (i<nrounds-1) {
            t7[i] <== t6[i]*t;
        } else {
            out <== t6[i]*t + k;
        }
    }
}