Add utils.v

utils.v

@@ -0,0 +1,67 @@
+module votp
+import crypto.hmac
+import crypto.sha1
+import crypto.sha256
+import crypto.sha512
+
+
+pub const (
+	v_version = '0.4.3 bc24683'
+	author = 'odai alghamdi'
+)
+
+
+
+pub fn u64_to_bytes(n i64) []u8 {
+	mut bytes := []u8{len: 8}
+	mut nn := n
+	for i := 7; i >= 0; i-- {
+		bytes[i] = u8(nn & 0xff)
+		nn >>= 8
+	}
+	return bytes
+}
+
+pub fn get_hash(msg []u8, key []u8, digest string) []u8 {
+	match digest {
+	"sha1" {
+		return hmac.new(key,msg, sha1.sum, sha1.block_size)
+	}
+	"sha256"{
+		return hmac.new(key,msg, sha256.sum, sha256.block_size)
+	}
+	"sha512" {
+		return hmac.new(key,msg, sha512.sum512, sha512.block_size)
+	}
+	else{
+		panic('Unsupported digest')
+	}
+	}
+}
+
+pub fn int_pow(base int, exp int) int {
+	mut result := 1
+	for i := 0; i < exp; i++ {
+		result *= base
+	}
+	return result
+}
+
+
+pub fn missing_pad(text string) string {
+	mut new_text := text
+	missing_padding := text.len % 8
+	missing := (8 - missing_padding)
+	mut i := 0
+	
+	if missing_padding != 0 {
+		
+		for i < missing {
+			new_text += '='
+			i++
+
+		}
+	}
+
+	return new_text
+}