70 lines
2.1 KiB
JavaScript
70 lines
2.1 KiB
JavaScript
/** RFC 1321 MD5 — no Web Crypto; used by md5sum. */
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function bareMd5DigestBytes(u8) {
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const n = u8.length
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const bitLen = (BigInt(n) * 8n) & 0xffffffffffffffffn
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const padLen = (56 - ((n + 1) % 64) + 64) % 64
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const total = n + 1 + padLen + 8
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const buf = new Uint8Array(total)
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buf.set(u8)
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buf[n] = 0x80
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const view = new DataView(buf.buffer)
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view.setUint32(total - 8, Number(bitLen & 0xffffffffn), true)
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view.setUint32(total - 4, Number((bitLen >> 32n) & 0xffffffffn), true)
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let a0 = 0x67452301
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let b0 = 0xefcdab89
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let c0 = 0x98badcfe
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let d0 = 0x10325476
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const s = [
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7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 5, 9, 14, 20, 5, 9,
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14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,
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4, 11, 16, 23, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21
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]
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const K = new Uint32Array(64)
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for (let i = 0; i < 64; i++) K[i] = Math.floor(Math.abs(Math.sin(i + 1)) * 0x100000000) >>> 0
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const leftRotate = (x, c) => ((x << c) | (x >>> (32 - c))) >>> 0
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for (let off = 0; off < total; off += 64) {
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const M = new Uint32Array(16)
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for (let i = 0; i < 16; i++) {
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M[i] = view.getUint32(off + i * 4, true)
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}
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let A = a0
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let B = b0
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let C = c0
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let D = d0
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for (let i = 0; i < 64; i++) {
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let F, g
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if (i < 16) {
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F = (B & C) | (~B & D)
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g = i
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} else if (i < 32) {
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F = (D & B) | (~D & C)
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g = (5 * i + 1) % 16
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} else if (i < 48) {
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F = B ^ C ^ D
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g = (3 * i + 5) % 16
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} else {
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F = C ^ (B | ~D)
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g = (7 * i) % 16
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}
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F = (F + A + K[i] + M[g]) >>> 0
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A = D
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D = C
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C = B
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B = (B + leftRotate(F, s[i])) >>> 0
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}
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a0 = (a0 + A) >>> 0
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b0 = (b0 + B) >>> 0
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c0 = (c0 + C) >>> 0
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d0 = (d0 + D) >>> 0
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}
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const out = new Uint8Array(16)
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const dv = new DataView(out.buffer)
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dv.setUint32(0, a0, true)
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dv.setUint32(4, b0, true)
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dv.setUint32(8, c0, true)
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dv.setUint32(12, d0, true)
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return [...out].map((b) => b.toString(16).padStart(2, '0')).join('')
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}
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