Initial project import

tools/v/vlib/crypto/ripemd160/ripemd160.v

@@ -0,0 +1,152 @@
+// Based on: https://github.com/golang/crypto/blob/master/ripemd160/ripemd160.go
+
+module ripemd160
+
+// RIPEMD-160 is designed by Hans Dobbertin, Antoon Bosselaers, and Bart
+// Preneel with specifications available at:
+// http://homes.esat.kuleuven.be/~cosicart/pdf/AB-9601/AB-9601.pdf.
+
+// The size of the checksum in bytes.
+const size = 20
+
+// The block size of the hash algorithm in bytes.
+const block_size = 64
+
+const _s0 = u32(0x67452301)
+const _s1 = u32(0xefcdab89)
+const _s2 = u32(0x98badcfe)
+const _s3 = u32(0x10325476)
+const _s4 = u32(0xc3d2e1f0)
+
+// Digest represents the partial evaluation of a checksum.
+struct Digest {
+mut:
+	s  []u32
+	x  []u8
+	nx int
+	tc u64
+}
+
+// free the resources taken by the Digest `d`
+@[unsafe]
+pub fn (mut d Digest) free() {
+	$if prealloc {
+		return
+	}
+	unsafe {
+		d.s.free()
+		d.x.free()
+	}
+}
+
+fn (mut d Digest) init() {
+	d.s = []u32{len: 5}
+	d.x = []u8{len: block_size}
+	d.reset()
+}
+
+// reset the state of the Digest `d`
+pub fn (mut d Digest) reset() {
+	d.s[0] = u32(_s0)
+	d.s[1] = u32(_s1)
+	d.s[2] = u32(_s2)
+	d.s[3] = u32(_s3)
+	d.s[4] = u32(_s4)
+	d.nx = 0
+	d.tc = 0
+}
+
+fn (d &Digest) clone() &Digest {
+	return &Digest{
+		...d
+		s: d.s.clone()
+		x: d.x.clone()
+	}
+}
+
+// new returns a new Digest (implementing hash.Hash) computing the RIPEMD-160 checksum.
+pub fn new() &Digest {
+	mut d := &Digest{}
+	d.init()
+	return d
+}
+
+// size returns the size of the checksum in bytes.
+pub fn (d &Digest) size() int {
+	return size
+}
+
+// block_size returns the block size of the checksum in bytes.
+pub fn (d &Digest) block_size() int {
+	return block_size
+}
+
+// hexhash returns a hexadecimal RIPEMD-160 hash sum `string` of `s`.
+pub fn hexhash(s string) string {
+	mut d := new()
+	d.write(s.bytes()) or { panic(err) }
+	return d.sum([]).hex()
+}
+
+// write writes the contents of `p_` to the internal hash representation.
+pub fn (mut d Digest) write(p_ []u8) !int {
+	unsafe {
+		mut p := p_
+		mut nn := p.len
+		d.tc += u64(nn)
+		if d.nx > 0 {
+			mut n := p.len
+			if n > block_size - d.nx {
+				n = block_size - d.nx
+			}
+			for i := 0; i < n; i++ {
+				d.x[d.nx + i] = p[i]
+			}
+			d.nx += n
+			if d.nx == block_size {
+				block(mut d, d.x[0..])
+				d.nx = 0
+			}
+			p = p[n..]
+		}
+		n := block(mut d, p)
+		p = p[n..]
+		if p.len > 0 {
+			d.nx = copy(mut d.x[..], p)
+		}
+		return nn
+	}
+}
+
+// sum returns the RIPEMD-160 sum of the bytes in `inp`.
+pub fn (d0 &Digest) sum(inp []u8) []u8 {
+	mut d := d0.clone()
+	mut tc := d.tc
+	mut tmp := []u8{len: 64}
+	tmp[0] = 0x80
+	if tc % 64 < 56 {
+		d.write(tmp[0..int(56 - tc % 64)]) or { panic(err) }
+	} else {
+		d.write(tmp[0..int(64 + 56 - tc % 64)]) or { panic(err) }
+	}
+
+	// Length in bits.
+	tc <<= 3
+	for i := u16(0); i < 8; i++ {
+		tmp[i] = u8(tc >> (8 * i))
+	}
+	d.write(tmp[0..8]) or { panic(err) }
+
+	if d.nx != 0 {
+		panic('v_crypto/ripemd160: d.nx != 0: ${d.nx}')
+	}
+
+	mut digest := []u8{len: size}
+	for i, s in d.s {
+		digest[i * 4] = u8(s)
+		digest[i * 4 + 1] = u8(s >> 8)
+		digest[i * 4 + 2] = u8(s >> 16)
+		digest[i * 4 + 3] = u8(s >> 24)
+	}
+	return digest
+}