crypto.[md5/rc4/sha1]: remove extraneous casts

vlib/crypto/md5/md5.v

@@ -45,7 +45,7 @@ fn (d mut Digest) reset() {
 	d.s[2] = u32(Init2)
 	d.s[3] = u32(Init3)
 	d.nx = 0
-	d.len = u64(0)
+	d.len = 0
 }
 
 // new returns a new Digest (implementing hash.Hash) computing the MD5 checksum.
@@ -104,10 +104,10 @@ pub fn (d mut Digest) checksum() []byte {
 	//
 	// 1 byte end marker :: 0-63 padding bytes :: 8 byte length
 	// tmp := [1 + 63 + 8]byte{0x80}
-    mut tmp := [byte(0); 1 + 63 + 8]
+    mut tmp := [byte(0)].repeat(1 + 63 + 8)
 	tmp[0] = 0x80
 	pad := (55 - int(d.len)) % 64 // calculate number of padding bytes
-	binary.little_endian_put_u64(mut tmp.right(1+pad), u64(d.len<<u64(3))) // append length in bits
+	binary.little_endian_put_u64(mut tmp.right(1+pad), d.len<<u64(3)) // append length in bits
     d.write(tmp.left(1+pad+8))
 
 	// The previous write ensures that a whole number of

vlib/crypto/rc4/rc4.v

@@ -51,10 +51,10 @@ pub fn new_cipher(key []byte) ?Cipher {
 // the process's memory.
 pub fn (c mut Cipher) reset() {
 	for i in c.s {
-		c.s[i] = u32(0)
+		c.s[i] = 0
 	}
-	c.i = byte(0)
-	c.j = byte(0)
+	c.i = 0
+	c.j = 0
 }
 
 // xor_key_stream sets dst to the result of XORing src with the key stream.

vlib/crypto/sha1/sha1.v

@@ -48,7 +48,7 @@ fn (d mut Digest) reset() {
 	d.h[3] = u32(Init3)
 	d.h[4] = u32(Init4)
 	d.nx = 0
-	d.len = u64(0)
+	d.len = 0
 }
 
 // new returns a new Digest (implementing hash.Hash) computing the SHA1 checksum.
@@ -115,7 +115,7 @@ fn (d mut Digest) checksum() []byte {
 	}
 
 	// Length in bits.
-	len <<= u64(3)
+	len <<= 3
 	binary.big_endian_put_u64(mut tmp, len)
 	d.write(tmp.left(8))
 

vlib/crypto/sha1/sha1block_generic.v

@@ -30,7 +30,7 @@ fn block_generic(dig mut Digest, p_ []byte) {
 		// rounds below if needed for speed.
 		for i := 0; i < 16; i++ {
 			j := i * 4
-			w[i] = u32(u32(p[j])<<u32(24)) | u32(u32(p[j+1])<<u32(16)) | u32(u32(p[j+2])<<u32(8)) | u32(u32(p[j+3]))
+			w[i] = u32(p[j]<<24) | u32(p[j+1]<<16) | u32(p[j+2]<<8) | u32(p[j+3])
 		}
 
 		mut a := h0
@@ -44,7 +44,7 @@ fn block_generic(dig mut Digest, p_ []byte) {
 		// the choice of K (_K0, _K1, etc).
 		mut i := 0
 		for i < 16 {
-			f := u32(b&c | (~b)&d)
+			f := b&c | (~b)&d
 			t := bits.rotate_left_32(a, 5) + f + e + w[i&0xf] + u32(_K0)
 			e = d
 			d = c
@@ -55,7 +55,7 @@ fn block_generic(dig mut Digest, p_ []byte) {
 		}
 		for i < 20 {
 			tmp := w[(i-3)&0xf] ^ w[(i-8)&0xf] ^ w[(i-14)&0xf] ^ w[(i)&0xf]
-			w[i&0xf] = u32(tmp<<u32(1)) | u32(tmp>>u32(32-1))
+			w[i&0xf] = tmp<<1 | u32(tmp>>(32-1))
 			f := b&c | (~b)&d
 			t := bits.rotate_left_32(a, 5) + f + e + w[i&0xf] + u32(_K0)
 			e = d
@@ -67,7 +67,7 @@ fn block_generic(dig mut Digest, p_ []byte) {
 		}
 		for i < 40 {
 			tmp := w[(i-3)&0xf] ^ w[(i-8)&0xf] ^ w[(i-14)&0xf] ^ w[(i)&0xf]
-			w[i&0xf] = u32(tmp<<u32(1)) | u32(tmp>>u32(32-1))
+			w[i&0xf] = tmp<<1 | u32(tmp>>(32-1))
 			f := b ^ c ^ d
 			t := bits.rotate_left_32(a, 5) + f + e + w[i&0xf] + u32(_K1)
 			e = d
@@ -79,7 +79,7 @@ fn block_generic(dig mut Digest, p_ []byte) {
 		}
 		for i < 60 {
 			tmp := w[(i-3)&0xf] ^ w[(i-8)&0xf] ^ w[(i-14)&0xf] ^ w[(i)&0xf]
-			w[i&0xf] = u32(tmp<<u32(1)) | u32(tmp>>u32(32-1))
+			w[i&0xf] = tmp<<1 | u32(tmp>>(32-1))
 			f := ((b | c) & d) | (b & c)
 			t := bits.rotate_left_32(a, 5) + f + e + w[i&0xf] + u32(_K2)
 			e = d
@@ -91,7 +91,7 @@ fn block_generic(dig mut Digest, p_ []byte) {
 		}
 		for i < 80 {
 			tmp := w[(i-3)&0xf] ^ w[(i-8)&0xf] ^ w[(i-14)&0xf] ^ w[(i)&0xf]
-			w[i&0xf] = u32(tmp<<u32(1)) | u32(tmp>>u32(32-1))
+			w[i&0xf] = tmp<<1 | u32(tmp>>(32-1))
 			f := b ^ c ^ d
 			t := bits.rotate_left_32(a, 5) + f + e + w[i&0xf] + u32(_K3)
 			e = d