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using GLib;
using Gee;
namespace Xmpp.Xep.CryptographicHashes {
public const string NS_URI = "urn:xmpp:hashes:2";
public Gee.List<Hash> get_hashes(StanzaNode node) {
var hashes = new ArrayList<Hash>();
foreach (StanzaNode hash_node in node.get_subnodes("hash", NS_URI)) {
hashes.add(new Hash.from_stanza_node(hash_node));
}
return hashes;
}
public Gee.List<Hash> get_supported_hashes(Gee.List<Hash> hashes) {
var ret = new ArrayList<Hash>();
foreach (Hash hash in hashes) {
ChecksumType? hash_type = hash_string_to_type(hash.algo);
if (hash_type != null) {
ret.add(hash);
}
}
return ret;
}
public bool has_supported_hashes(Gee.List<Hash> hashes) {
foreach (Hash hash in hashes) {
ChecksumType? hash_type = hash_string_to_type(hash.algo);
if (hash_type != null) return true;
}
return false;
}
public class Hash : Object {
public string algo;
// hash encoded in Base64
public string val;
public Hash.with_checksum(ChecksumType checksum_type, string hash) {
algo = hash_type_to_string(checksum_type);
val = hash;
}
public Hash.compute(GLib.ChecksumType type, uint8[] data) {
GLib.Checksum checksum = new GLib.Checksum(type);
checksum.update(data, data.length);
// 64 * 8 = 512 (sha-512 is the longest hash variant)
uint8[] digest = new uint8[64];
size_t length = digest.length;
checksum.get_digest(digest, ref length);
this.algo = hash_type_to_string(type);
this.val = GLib.Base64.encode(digest[0:length]);
}
public StanzaNode to_stanza_node() {
return new StanzaNode.build("hash", NS_URI).add_self_xmlns()
.put_attribute("algo", this.algo)
.put_node(new StanzaNode.text(this.val));
}
public Hash.from_stanza_node(StanzaNode node) {
this.algo = node.get_attribute("algo");
this.val = node.get_string_content();
}
}
public static string hash_type_to_string(ChecksumType type) {
switch(type) {
case ChecksumType.MD5:
return "md5";
case ChecksumType.SHA1:
return "sha-1";
case ChecksumType.SHA256:
return "sha-256";
case ChecksumType.SHA384:
return "sha-384";
case ChecksumType.SHA512:
return "sha-512";
}
return "(null)";
}
public static ChecksumType? hash_string_to_type(string hash) {
switch (hash) {
case "sha-1":
return ChecksumType.SHA1;
case "sha-256":
return ChecksumType.SHA256;
case "sha-384":
return ChecksumType.SHA384;
case "sha-512":
return ChecksumType.SHA512;
}
return null;
}
}
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