361 lines
9.7 KiB
JavaScript
361 lines
9.7 KiB
JavaScript
/*
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* Port of Andrew Moon's Poly1305-donna-16. Public domain.
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* https://github.com/floodyberry/poly1305-donna
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*/
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if (new Uint16Array([1])[0] !== 1) throw new Error('Big endian architecture is not supported.')
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var poly1305 = function(key) {
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this.buffer = new Uint8Array(16);
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this.r = new Uint16Array(10);
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this.h = new Uint16Array(10);
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this.pad = new Uint16Array(8);
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this.leftover = 0;
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this.fin = 0;
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var t0, t1, t2, t3, t4, t5, t6, t7;
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t0 = key[ 0] & 0xff | (key[ 1] & 0xff) << 8; this.r[0] = ( t0 ) & 0x1fff;
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t1 = key[ 2] & 0xff | (key[ 3] & 0xff) << 8; this.r[1] = ((t0 >>> 13) | (t1 << 3)) & 0x1fff;
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t2 = key[ 4] & 0xff | (key[ 5] & 0xff) << 8; this.r[2] = ((t1 >>> 10) | (t2 << 6)) & 0x1f03;
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t3 = key[ 6] & 0xff | (key[ 7] & 0xff) << 8; this.r[3] = ((t2 >>> 7) | (t3 << 9)) & 0x1fff;
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t4 = key[ 8] & 0xff | (key[ 9] & 0xff) << 8; this.r[4] = ((t3 >>> 4) | (t4 << 12)) & 0x00ff;
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this.r[5] = ((t4 >>> 1)) & 0x1ffe;
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t5 = key[10] & 0xff | (key[11] & 0xff) << 8; this.r[6] = ((t4 >>> 14) | (t5 << 2)) & 0x1fff;
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t6 = key[12] & 0xff | (key[13] & 0xff) << 8; this.r[7] = ((t5 >>> 11) | (t6 << 5)) & 0x1f81;
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t7 = key[14] & 0xff | (key[15] & 0xff) << 8; this.r[8] = ((t6 >>> 8) | (t7 << 8)) & 0x1fff;
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this.r[9] = ((t7 >>> 5)) & 0x007f;
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this.pad[0] = key[16] & 0xff | (key[17] & 0xff) << 8;
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this.pad[1] = key[18] & 0xff | (key[19] & 0xff) << 8;
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this.pad[2] = key[20] & 0xff | (key[21] & 0xff) << 8;
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this.pad[3] = key[22] & 0xff | (key[23] & 0xff) << 8;
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this.pad[4] = key[24] & 0xff | (key[25] & 0xff) << 8;
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this.pad[5] = key[26] & 0xff | (key[27] & 0xff) << 8;
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this.pad[6] = key[28] & 0xff | (key[29] & 0xff) << 8;
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this.pad[7] = key[30] & 0xff | (key[31] & 0xff) << 8;
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};
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poly1305.prototype.blocks = function(m, mpos, bytes) {
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var hibit = this.fin ? 0 : (1 << 11);
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var t0, t1, t2, t3, t4, t5, t6, t7, c;
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var d0, d1, d2, d3, d4, d5, d6, d7, d8, d9;
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var h0 = this.h[0],
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h1 = this.h[1],
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h2 = this.h[2],
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h3 = this.h[3],
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h4 = this.h[4],
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h5 = this.h[5],
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h6 = this.h[6],
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h7 = this.h[7],
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h8 = this.h[8],
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h9 = this.h[9];
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var r0 = this.r[0],
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r1 = this.r[1],
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r2 = this.r[2],
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r3 = this.r[3],
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r4 = this.r[4],
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r5 = this.r[5],
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r6 = this.r[6],
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r7 = this.r[7],
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r8 = this.r[8],
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r9 = this.r[9];
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while (bytes >= 16) {
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t0 = m[mpos+ 0] & 0xff | (m[mpos+ 1] & 0xff) << 8; h0 += ( t0 ) & 0x1fff;
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t1 = m[mpos+ 2] & 0xff | (m[mpos+ 3] & 0xff) << 8; h1 += ((t0 >>> 13) | (t1 << 3)) & 0x1fff;
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t2 = m[mpos+ 4] & 0xff | (m[mpos+ 5] & 0xff) << 8; h2 += ((t1 >>> 10) | (t2 << 6)) & 0x1fff;
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t3 = m[mpos+ 6] & 0xff | (m[mpos+ 7] & 0xff) << 8; h3 += ((t2 >>> 7) | (t3 << 9)) & 0x1fff;
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t4 = m[mpos+ 8] & 0xff | (m[mpos+ 9] & 0xff) << 8; h4 += ((t3 >>> 4) | (t4 << 12)) & 0x1fff;
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h5 += ((t4 >>> 1)) & 0x1fff;
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t5 = m[mpos+10] & 0xff | (m[mpos+11] & 0xff) << 8; h6 += ((t4 >>> 14) | (t5 << 2)) & 0x1fff;
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t6 = m[mpos+12] & 0xff | (m[mpos+13] & 0xff) << 8; h7 += ((t5 >>> 11) | (t6 << 5)) & 0x1fff;
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t7 = m[mpos+14] & 0xff | (m[mpos+15] & 0xff) << 8; h8 += ((t6 >>> 8) | (t7 << 8)) & 0x1fff;
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h9 += ((t7 >>> 5)) | hibit;
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c = 0;
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d0 = c;
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d0 += h0 * r0;
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d0 += h1 * (5 * r9);
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d0 += h2 * (5 * r8);
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d0 += h3 * (5 * r7);
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d0 += h4 * (5 * r6);
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c = (d0 >>> 13); d0 &= 0x1fff;
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d0 += h5 * (5 * r5);
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d0 += h6 * (5 * r4);
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d0 += h7 * (5 * r3);
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d0 += h8 * (5 * r2);
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d0 += h9 * (5 * r1);
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c += (d0 >>> 13); d0 &= 0x1fff;
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d1 = c;
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d1 += h0 * r1;
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d1 += h1 * r0;
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d1 += h2 * (5 * r9);
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d1 += h3 * (5 * r8);
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d1 += h4 * (5 * r7);
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c = (d1 >>> 13); d1 &= 0x1fff;
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d1 += h5 * (5 * r6);
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d1 += h6 * (5 * r5);
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d1 += h7 * (5 * r4);
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d1 += h8 * (5 * r3);
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d1 += h9 * (5 * r2);
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c += (d1 >>> 13); d1 &= 0x1fff;
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d2 = c;
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d2 += h0 * r2;
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d2 += h1 * r1;
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d2 += h2 * r0;
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d2 += h3 * (5 * r9);
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d2 += h4 * (5 * r8);
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c = (d2 >>> 13); d2 &= 0x1fff;
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d2 += h5 * (5 * r7);
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d2 += h6 * (5 * r6);
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d2 += h7 * (5 * r5);
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d2 += h8 * (5 * r4);
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d2 += h9 * (5 * r3);
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c += (d2 >>> 13); d2 &= 0x1fff;
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d3 = c;
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d3 += h0 * r3;
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d3 += h1 * r2;
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d3 += h2 * r1;
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d3 += h3 * r0;
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d3 += h4 * (5 * r9);
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c = (d3 >>> 13); d3 &= 0x1fff;
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d3 += h5 * (5 * r8);
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d3 += h6 * (5 * r7);
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d3 += h7 * (5 * r6);
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d3 += h8 * (5 * r5);
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d3 += h9 * (5 * r4);
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c += (d3 >>> 13); d3 &= 0x1fff;
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d4 = c;
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d4 += h0 * r4;
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d4 += h1 * r3;
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d4 += h2 * r2;
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d4 += h3 * r1;
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d4 += h4 * r0;
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c = (d4 >>> 13); d4 &= 0x1fff;
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d4 += h5 * (5 * r9);
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d4 += h6 * (5 * r8);
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d4 += h7 * (5 * r7);
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d4 += h8 * (5 * r6);
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d4 += h9 * (5 * r5);
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c += (d4 >>> 13); d4 &= 0x1fff;
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d5 = c;
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d5 += h0 * r5;
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d5 += h1 * r4;
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d5 += h2 * r3;
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d5 += h3 * r2;
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d5 += h4 * r1;
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c = (d5 >>> 13); d5 &= 0x1fff;
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d5 += h5 * r0;
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d5 += h6 * (5 * r9);
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d5 += h7 * (5 * r8);
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d5 += h8 * (5 * r7);
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d5 += h9 * (5 * r6);
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c += (d5 >>> 13); d5 &= 0x1fff;
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d6 = c;
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d6 += h0 * r6;
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d6 += h1 * r5;
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d6 += h2 * r4;
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d6 += h3 * r3;
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d6 += h4 * r2;
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c = (d6 >>> 13); d6 &= 0x1fff;
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d6 += h5 * r1;
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d6 += h6 * r0;
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d6 += h7 * (5 * r9);
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d6 += h8 * (5 * r8);
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d6 += h9 * (5 * r7);
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c += (d6 >>> 13); d6 &= 0x1fff;
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d7 = c;
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d7 += h0 * r7;
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d7 += h1 * r6;
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d7 += h2 * r5;
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d7 += h3 * r4;
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d7 += h4 * r3;
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c = (d7 >>> 13); d7 &= 0x1fff;
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d7 += h5 * r2;
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d7 += h6 * r1;
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d7 += h7 * r0;
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d7 += h8 * (5 * r9);
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d7 += h9 * (5 * r8);
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c += (d7 >>> 13); d7 &= 0x1fff;
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d8 = c;
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d8 += h0 * r8;
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d8 += h1 * r7;
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d8 += h2 * r6;
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d8 += h3 * r5;
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d8 += h4 * r4;
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c = (d8 >>> 13); d8 &= 0x1fff;
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d8 += h5 * r3;
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d8 += h6 * r2;
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d8 += h7 * r1;
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d8 += h8 * r0;
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d8 += h9 * (5 * r9);
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c += (d8 >>> 13); d8 &= 0x1fff;
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d9 = c;
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d9 += h0 * r9;
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d9 += h1 * r8;
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d9 += h2 * r7;
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d9 += h3 * r6;
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d9 += h4 * r5;
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c = (d9 >>> 13); d9 &= 0x1fff;
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d9 += h5 * r4;
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d9 += h6 * r3;
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d9 += h7 * r2;
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d9 += h8 * r1;
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d9 += h9 * r0;
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c += (d9 >>> 13); d9 &= 0x1fff;
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c = (((c << 2) + c)) | 0;
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c = (c + d0) | 0;
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d0 = c & 0x1fff;
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c = (c >>> 13);
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d1 += c;
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h0 = d0;
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h1 = d1;
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h2 = d2;
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h3 = d3;
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h4 = d4;
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h5 = d5;
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h6 = d6;
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h7 = d7;
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h8 = d8;
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h9 = d9;
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mpos += 16;
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bytes -= 16;
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}
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this.h[0] = h0;
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this.h[1] = h1;
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this.h[2] = h2;
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this.h[3] = h3;
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this.h[4] = h4;
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this.h[5] = h5;
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this.h[6] = h6;
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this.h[7] = h7;
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this.h[8] = h8;
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this.h[9] = h9;
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};
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poly1305.prototype.finish = function(mac, macpos) {
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var g = new Uint16Array(10);
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var c, mask, f, i;
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if (this.leftover) {
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i = this.leftover;
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this.buffer[i++] = 1;
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for (; i < 16; i++) this.buffer[i] = 0;
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this.fin = 1;
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this.blocks(this.buffer, 0, 16);
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}
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c = this.h[1] >>> 13;
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this.h[1] &= 0x1fff;
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for (i = 2; i < 10; i++) {
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this.h[i] += c;
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c = this.h[i] >>> 13;
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this.h[i] &= 0x1fff;
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}
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this.h[0] += (c * 5);
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c = this.h[0] >>> 13;
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this.h[0] &= 0x1fff;
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this.h[1] += c;
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c = this.h[1] >>> 13;
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this.h[1] &= 0x1fff;
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this.h[2] += c;
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g[0] = this.h[0] + 5;
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c = g[0] >>> 13;
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g[0] &= 0x1fff;
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for (i = 1; i < 10; i++) {
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g[i] = this.h[i] + c;
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c = g[i] >>> 13;
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g[i] &= 0x1fff;
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}
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g[9] -= (1 << 13);
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mask = (c ^ 1) - 1;
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for (i = 0; i < 10; i++) g[i] &= mask;
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mask = ~mask;
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for (i = 0; i < 10; i++) this.h[i] = (this.h[i] & mask) | g[i];
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this.h[0] = ((this.h[0] ) | (this.h[1] << 13) ) & 0xffff;
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this.h[1] = ((this.h[1] >>> 3) | (this.h[2] << 10) ) & 0xffff;
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this.h[2] = ((this.h[2] >>> 6) | (this.h[3] << 7) ) & 0xffff;
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this.h[3] = ((this.h[3] >>> 9) | (this.h[4] << 4) ) & 0xffff;
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this.h[4] = ((this.h[4] >>> 12) | (this.h[5] << 1) | (this.h[6] << 14)) & 0xffff;
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this.h[5] = ((this.h[6] >>> 2) | (this.h[7] << 11) ) & 0xffff;
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this.h[6] = ((this.h[7] >>> 5) | (this.h[8] << 8) ) & 0xffff;
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this.h[7] = ((this.h[8] >>> 8) | (this.h[9] << 5) ) & 0xffff;
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f = this.h[0] + this.pad[0];
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this.h[0] = f & 0xffff;
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for (i = 1; i < 8; i++) {
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f = (((this.h[i] + this.pad[i]) | 0) + (f >>> 16)) | 0;
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this.h[i] = f & 0xffff;
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}
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mac[macpos+ 0] = (this.h[0] >>> 0) & 0xff;
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mac[macpos+ 1] = (this.h[0] >>> 8) & 0xff;
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mac[macpos+ 2] = (this.h[1] >>> 0) & 0xff;
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mac[macpos+ 3] = (this.h[1] >>> 8) & 0xff;
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mac[macpos+ 4] = (this.h[2] >>> 0) & 0xff;
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mac[macpos+ 5] = (this.h[2] >>> 8) & 0xff;
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mac[macpos+ 6] = (this.h[3] >>> 0) & 0xff;
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mac[macpos+ 7] = (this.h[3] >>> 8) & 0xff;
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mac[macpos+ 8] = (this.h[4] >>> 0) & 0xff;
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mac[macpos+ 9] = (this.h[4] >>> 8) & 0xff;
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mac[macpos+10] = (this.h[5] >>> 0) & 0xff;
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mac[macpos+11] = (this.h[5] >>> 8) & 0xff;
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mac[macpos+12] = (this.h[6] >>> 0) & 0xff;
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mac[macpos+13] = (this.h[6] >>> 8) & 0xff;
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mac[macpos+14] = (this.h[7] >>> 0) & 0xff;
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mac[macpos+15] = (this.h[7] >>> 8) & 0xff;
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};
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poly1305.prototype.update = function(m, mpos, bytes) {
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var i, want;
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if (this.leftover) {
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want = (16 - this.leftover);
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if (want > bytes)
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want = bytes;
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for (i = 0; i < want; i++)
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this.buffer[this.leftover + i] = m[mpos+i];
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bytes -= want;
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mpos += want;
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this.leftover += want;
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if (this.leftover < 16)
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return;
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this.blocks(this.buffer, 0, 16);
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this.leftover = 0;
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}
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if (bytes >= 16) {
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want = bytes - (bytes % 16);
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this.blocks(m, mpos, want);
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mpos += want;
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bytes -= want;
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}
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if (bytes) {
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for (i = 0; i < bytes; i++)
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this.buffer[this.leftover + i] = m[mpos+i];
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this.leftover += bytes;
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}
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};
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module.exports = poly1305
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