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package identicon
import java.lang.Math
import java.util.Base64
trait Identicon {
private def lrot(x: Int, c: Int) = (x << c) | (x >>> (32 - c))
// NB: this implementation has a bug and does NOT correspond to the actual MD5
// specification. It does however produce a hash that appears to be good
// enough for generating identicons.
private def md5(in: IndexedSeq[Byte]): Array[Byte] = {
var s = Array[Int](
7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 5, 9, 14, 20,
5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 4, 11, 16, 23, 4, 11, 16, 23, 4,
11, 16, 23, 4, 11, 16, 23, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6,
10, 15, 21
)
var K = Array[Int](
0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf, 0x4787c62a,
0xa8304613, 0xfd469501, 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, 0xf61e2562, 0xc040b340,
0x265e5a51, 0xe9b6c7aa, 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905, 0xfcefa3f8,
0x676f02d9, 0x8d2a4c8a, 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, 0x289b7ec6, 0xeaa127fa,
0xd4ef3085, 0x04881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92,
0xffeff47d, 0x85845dd1, 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
)
var a0 = 0x67452301
var b0 = 0xefcdab89
var c0 = 0x98badcfe
var d0 = 0x10325476
// 1 = extra "0b1000000" byte
val zeroBytes = Math.floorMod(61 - (in.size + 1), 64)
val data = new Array[Byte](in.size + 1 + zeroBytes + 4) // 4 = length
for ((byte, i) <- in.zipWithIndex) {
data(i) = byte
}
data(in.size) = (1 << 7).toByte
data(in.size + 1 + zeroBytes) = ((in.size >>> 24) & 0xff).toByte
data(in.size + 1 + zeroBytes + 1) = ((in.size >>> 16) & 0xff).toByte
data(in.size + 1 + zeroBytes + 2) = ((in.size >>> 8) & 0xff).toByte
data(in.size + 1 + zeroBytes + 3) = ((in.size) & 0xff).toByte
for (chunk <- 0 until data.size / 64) {
val M = for (i <- 0 until 16) yield {
(data(chunk * 64 + i * 4) << 24) |
(data(chunk * 64 + i * 4 + 1) << 16) |
(data(chunk * 64 + i * 4 + 2) << 8) |
data(chunk * 64 + i * 4 + 3)
}
var A = a0
var B = b0
var C = c0
var D = d0
for (i <- 0 until 64) {
var F = 0
var g = 0
if (0 <= i && i <= 15) {
F = (B & C) | ((~B) & D)
g = i
} else if (16 <= i && i <= 31) {
F = (D & B) | ((~D) & C)
g = (5 * i + 1) % 16
} else if (32 <= i && i <= 47) {
F = B ^ C ^ D
g = (3 * i + 5) % 16
} else if (48 <= i && i <= 63) {
F = C ^ (B | (~D))
g = (7 * i) % 16
}
F = F + A + K(i) + M(g)
A = D
D = C
C = B
B = B + lrot(F, s(i))
}
a0 = a0 + A
b0 = b0 + B
c0 = c0 + C
d0 = d0 + D
}
val digest = new Array[Byte](16)
digest(0) = ((a0 >>> 24) & 0xff).toByte
digest(1) = ((a0 >>> 16) & 0xff).toByte
digest(2) = ((a0 >>> 8) & 0xff).toByte
digest(3) = ((a0 & 0xff)).toByte
digest(4) = ((b0 >>> 24) & 0xff).toByte
digest(5) = ((b0 >>> 16) & 0xff).toByte
digest(6) = ((b0 >>> 8) & 0xff).toByte
digest(7) = ((b0 & 0xff)).toByte
digest(8) = ((c0 >>> 24) & 0xff).toByte
digest(9) = ((c0 >>> 16) & 0xff).toByte
digest(10) = ((c0 >>> 8) & 0xff).toByte
digest(11) = ((c0 & 0xff)).toByte
digest(12) = ((d0 >>> 24) & 0xff).toByte
digest(13) = ((d0 >>> 16) & 0xff).toByte
digest(14) = ((d0 >>> 8) & 0xff).toByte
digest(15) = ((d0 & 0xff)).toByte
digest
}
def svg(name: String): String = {
val hash = md5(name.getBytes("UTF-8"))
val builder = new StringBuilder
val color = {
val r = hash(0) & 0xff
val g = hash(1) & 0xff
val b = hash(2) & 0xff
f"#$r%02x$g%02x$b%02x"
}
val style = s"fill:$color;stroke:$color;stroke-width:0.05"
builder ++= s"""<svg xmlns="http://www.w3.org/2000/svg" width="5" height="5">"""
for (x <- 0 until 2) {
for (y <- 0 until 5) {
if (((hash(x) >>> y) & 0x01) != 0) {
builder ++= s"""<rect x="$x" y="$y" width="1" height="1" style="$style"/>"""
builder ++= s"""<rect x="${4 - x}" y="$y" width="1" height="1" style="$style"/>"""
}
}
}
for (y <- 0 until 5) {
if (((hash(2) >>> y) & 0x01) != 0) {
builder ++= s"""<rect x="2" y="$y" width="1" height="1" style="$style"/>"""
}
}
builder ++= "</svg>"
builder.result()
}
def url(name: String): String = {
val b64 = Base64.getEncoder().encodeToString(svg(name).getBytes("UTF-8"))
s"data:image/svg+xml;base64,$b64"
}
// def url(name: String): String = {
// s"data:image/svg+xml;utf8,${svg(name)}"
// }
}
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