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md5.ts
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45 lines (45 loc) · 4.21 KB
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// https://stackoverflow.com/a/74041923 ported to TypeScript
// just a short-ish md5 implementation since there's no built-in one in the browser
// and all the libraries were a bit too much for this simple use case
export const md5 = (input: string) => {
const hc = '0123456789abcdef';
const rh = (n: number) => {let j: any,s='';for(j=0;j<=3;j++) s+=hc.charAt((n>>(j*8+4))&0x0F)+hc.charAt((n>>(j*8))&0x0F);return s;}
const ad = (x: number, y: number) => {const l=(x&0xFFFF)+(y&0xFFFF);const m=(x>>16)+(y>>16)+(l>>16);return (m<<16)|(l&0xFFFF);}
const rl = (n: number, c: number) => (n<<c)|(n>>>(32-c));
const cm = (q: number, a: any, b: any, x: any, s: any, t: any) => ad(rl(ad(ad(a,q),ad(x,t)),s),b);
const ff = (a: number, b: number, c: number, d: number, x: number, s: number,t: number) => cm((b&c)|((~b)&d),a,b,x,s,t);
const gg = (a: number, b: number, c: number, d: number, x: number, s: number,t: number) => cm((b&d)|(c&(~d)),a,b,x,s,t);
const hh = (a: number, b: number, c: number, d: number, x: number, s: number,t: number) => cm(b^c^d,a,b,x,s,t);
const ii = (a: number, b: number, c: number, d: number, x: number, s: number,t: number) => cm(c^(b|(~d)),a,b,x,s,t);
const sb = (x: string) => {
let i: any;const nblk=((x.length+8)>>6)+1;const blks=[];for(i=0;i<nblk*16;i++) { blks[i]=0 };
for(i=0;i<x.length;i++) {blks[i>>2]|=x.charCodeAt(i)<<((i%4)*8);}
blks[i>>2]|=0x80<<((i%4)*8);blks[nblk*16-2]=x.length*8;return blks;
}
let i: any,x=sb(input),a=1732584193,b=-271733879,c=-1732584194,d=271733878,olda:any,oldb:any,oldc:any,oldd:any;
for(i=0;i<x.length;i+=16) {olda=a;oldb=b;oldc=c;oldd=d;
a=ff(a,b,c,d,x[i+ 0], 7, -680876936);d=ff(d,a,b,c,x[i+ 1],12, -389564586);c=ff(c,d,a,b,x[i+ 2],17, 606105819);
b=ff(b,c,d,a,x[i+ 3],22,-1044525330);a=ff(a,b,c,d,x[i+ 4], 7, -176418897);d=ff(d,a,b,c,x[i+ 5],12, 1200080426);
c=ff(c,d,a,b,x[i+ 6],17,-1473231341);b=ff(b,c,d,a,x[i+ 7],22, -45705983);a=ff(a,b,c,d,x[i+ 8], 7, 1770035416);
d=ff(d,a,b,c,x[i+ 9],12,-1958414417);c=ff(c,d,a,b,x[i+10],17, -42063);b=ff(b,c,d,a,x[i+11],22,-1990404162);
a=ff(a,b,c,d,x[i+12], 7, 1804603682);d=ff(d,a,b,c,x[i+13],12, -40341101);c=ff(c,d,a,b,x[i+14],17,-1502002290);
b=ff(b,c,d,a,x[i+15],22, 1236535329);a=gg(a,b,c,d,x[i+ 1], 5, -165796510);d=gg(d,a,b,c,x[i+ 6], 9,-1069501632);
c=gg(c,d,a,b,x[i+11],14, 643717713);b=gg(b,c,d,a,x[i+ 0],20, -373897302);a=gg(a,b,c,d,x[i+ 5], 5, -701558691);
d=gg(d,a,b,c,x[i+10], 9, 38016083);c=gg(c,d,a,b,x[i+15],14, -660478335);b=gg(b,c,d,a,x[i+ 4],20, -405537848);
a=gg(a,b,c,d,x[i+ 9], 5, 568446438);d=gg(d,a,b,c,x[i+14], 9,-1019803690);c=gg(c,d,a,b,x[i+ 3],14, -187363961);
b=gg(b,c,d,a,x[i+ 8],20, 1163531501);a=gg(a,b,c,d,x[i+13], 5,-1444681467);d=gg(d,a,b,c,x[i+ 2], 9, -51403784);
c=gg(c,d,a,b,x[i+ 7],14, 1735328473);b=gg(b,c,d,a,x[i+12],20,-1926607734);a=hh(a,b,c,d,x[i+ 5], 4, -378558);
d=hh(d,a,b,c,x[i+ 8],11,-2022574463);c=hh(c,d,a,b,x[i+11],16, 1839030562);b=hh(b,c,d,a,x[i+14],23, -35309556);
a=hh(a,b,c,d,x[i+ 1], 4,-1530992060);d=hh(d,a,b,c,x[i+ 4],11, 1272893353);c=hh(c,d,a,b,x[i+ 7],16, -155497632);
b=hh(b,c,d,a,x[i+10],23,-1094730640);a=hh(a,b,c,d,x[i+13], 4, 681279174);d=hh(d,a,b,c,x[i+ 0],11, -358537222);
c=hh(c,d,a,b,x[i+ 3],16, -722521979);b=hh(b,c,d,a,x[i+ 6],23, 76029189);a=hh(a,b,c,d,x[i+ 9], 4, -640364487);
d=hh(d,a,b,c,x[i+12],11, -421815835);c=hh(c,d,a,b,x[i+15],16, 530742520);b=hh(b,c,d,a,x[i+ 2],23, -995338651);
a=ii(a,b,c,d,x[i+ 0], 6, -198630844);d=ii(d,a,b,c,x[i+ 7],10, 1126891415);c=ii(c,d,a,b,x[i+14],15,-1416354905);
b=ii(b,c,d,a,x[i+ 5],21, -57434055);a=ii(a,b,c,d,x[i+12], 6, 1700485571);d=ii(d,a,b,c,x[i+ 3],10,-1894986606);
c=ii(c,d,a,b,x[i+10],15, -1051523);b=ii(b,c,d,a,x[i+ 1],21,-2054922799);a=ii(a,b,c,d,x[i+ 8], 6, 1873313359);
d=ii(d,a,b,c,x[i+15],10, -30611744);c=ii(c,d,a,b,x[i+ 6],15,-1560198380);b=ii(b,c,d,a,x[i+13],21, 1309151649);
a=ii(a,b,c,d,x[i+ 4], 6, -145523070);d=ii(d,a,b,c,x[i+11],10,-1120210379);c=ii(c,d,a,b,x[i+ 2],15, 718787259);
b=ii(b,c,d,a,x[i+ 9],21, -343485551);a=ad(a,olda);b=ad(b,oldb);c=ad(c,oldc);d=ad(d,oldd);
}
return rh(a)+rh(b)+rh(c)+rh(d);
}