pof
Proof of Freshness: collate proof of an authorship date.
Log | Files | << Repositories
tree f61dd7c61ffad7c4d6472085cd89612ce4d043f1 author esote <esote.net@gmail.com> 1563077126 -0500 committer esote <esote.net@gmail.com> 1563077126 -0500 gpgsig -----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQTXAxYDuIzimYoNSPuhTmRAjzzC8gUCXSqqGAAKCRChTmRAjzzC 8ukVAP4yTXKEQAvVc2Ez7xze1b678C+2TqXvrJahrXb4HxIjQgD+KscvGbHSktC2 3wTuGYoAxoWmFf8Y3UtPvViAo4R9Ggk= =Axf8 -----END PGP SIGNATURE----- Proof of Freshness
README | 80 ++++++++++++++++++++++ pof.go | 233 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 313 insertions(+)
diff --git a/README b/README
new file mode 100644
index 0000000..8f8bae2
--- /dev/null
+++ b/README
@@ -0,0 +1,80 @@
+Proof of Freshness. Run with:
+
+ $ go get github.com/esote/pof
+ $ cd $GOPATH/src/github.com/esote/pof && go run pof.go
+
+Collate values from multiple sources. Used to prove something cannot have been
+prepared ahead of the date specified within an hour or so.
+
+Current sources:
+ - News (selects top 5 articles)
+ - Der Spiegel International
+ - New York Times World News
+ - BBC World News
+ - Reuters World News
+ - The Economist International
+ - NIST randomness beacon (v1 and v2)
+ - Bitcoin block hash, depth 10
+ - Monero block hash, depth 10
+
+Inspired by the proof of freshness used in Qubes OS's canaries.
+
+Example output:
+
+ Date: 2019-07-14 04:01 UTC
+
+ Src: SPIEGEL ONLINE - International (https://www.spiegel.de/international/index.rss)
+ ---
+ Far-Right AfD: Germany's Populist Party Embraces Its Extremist Wing
+ A Question of Trust: Ursula Von Der Leyen Recruits Team to Win Over Brussels
+ Feeding People With Science: Plant Researchers Brace for Population Explosion
+ A Heroine and a Figure of Hate: Carola Rackete and Europe's Troubling Refugee Policies
+ Sea-Watch Captain Carola Rackete: 'We Were All in a State of Total Despair'
+
+ Src: NYT > World News (https://rss.nytimes.com/services/xml/rss/nyt/World.xml)
+ ---
+ After a Police Shooting, Ethiopian Israelis Seek a ‘Black Lives Matter’ Reckoning
+ The Taliban Promise to Protect Women. Here’s Why Women Don’t Believe Them.
+ Hong Kong Protest Against Mainland Chinese Traders Turns Violent
+ At Least 26 Dead in Somalia Hotel Attack Claimed by Shabab
+ A ‘Dark Lord’ Falls in Russia’s Growing Power Struggle
+
+ Src: BBC News - World (https://feeds.bbci.co.uk/news/world/rss.xml)
+ ---
+ New leak claims Trump scrapped Iran nuclear deal 'to spite Obama'
+ New York power cut: Supply restored in Manhattan
+ Man dies after attacking Tacoma immigration jail, police say
+ Iranian tanker will be released if oil isn't going to Syria, says Hunt
+ France to create new space defence command in September
+
+ Src: Reuters: World News (http://feeds.reuters.com/reuters/worldnews)
+ ---
+ Taiwan president travels to Haiti to bolster relations in the region
+ Hong Kong protesters, police clash as demonstrations target Chinese traders
+ Cuba takes first step in railways upgrade with Chinese, Russian help
+ Cuba hopes for slight growth as Trump pummels Caribbean island
+ Monsoon rains kill 30 people in Nepal, others missing
+
+ Src: International (https://www.economist.com/international/rss.xml)
+ ---
+ Why are happy people voting for angry parties?
+ Children make parents happy, after all
+ A brief history—and future—of credit scores
+ The Gulf of Guinea is now the world’s worst piracy hotspot
+ Pet-ownership is booming across the world
+
+ Src: NIST Beacon v1 (https://beacon.nist.gov/rest/record/last)
+ ---
+ 1A13A30ED048D48603F062993C69648C0FBF56DB5FE13FA3817511FFCD6AD1E7C81C7F82055DB20E18993678E9C71BBC1C4228C29C8320CE477DF1CE9945AF1E
+
+ Src: NIST Beacon v2 (https://beacon.nist.gov/beacon/2.0/pulse/last)
+ ---
+ 541C24E069D78E9728990DF6A490BF3E3B271B9EFFCF5F08851D791048ED5423707F9C5E592C1B75B5ACC23562CECF0F25F14063D0A2831EBC72BD4972355445
+
+ Src: Blockchain.Info [block depth 10] (https://blockchain.info/blocks/?format=json)
+ ---
+ 0000000000000000000db40b8598bd32f992461dce4c1b8c344b3b140bc5a79f
+
+ Src: Moneroblocks.Info [block depth 10] (https://moneroblocks.info/api/get_block_header/1878020)
+ ---
+ cafbc5e7efb2277a6aa90eff6ba3a32b36ac768221b2600cc6b7a41b32645b9a
diff --git a/pof.go b/pof.go
new file mode 100644
index 0000000..67acb3d
--- /dev/null
+++ b/pof.go
@@ -0,0 +1,233 @@
+package main
+
+import (
+ "encoding/json"
+ "encoding/xml"
+ "fmt"
+ "io/ioutil"
+ "log"
+ "net/http"
+ "time"
+
+ "github.com/mmcdole/gofeed"
+)
+
+func main() {
+ parser := gofeed.NewParser()
+
+ // date
+ fmt.Printf("Date: %s\n\n",
+ time.Now().UTC().Format("2006-01-02 15:04 MST"))
+
+ // news feeds
+ news(parser, 5)
+
+ // NIST randomness beacons
+ nist()
+
+ // BTC block hash
+ btc()
+
+ // Monero block hash
+ monero()
+}
+
+func news(parser *gofeed.Parser, count int) {
+ urls := []string{
+ "https://www.spiegel.de/international/index.rss",
+ "https://rss.nytimes.com/services/xml/rss/nyt/World.xml",
+ "https://feeds.bbci.co.uk/news/world/rss.xml",
+ "http://feeds.reuters.com/reuters/worldnews",
+ "https://www.economist.com/international/rss.xml",
+ }
+
+ for _, url := range urls {
+ feed, err := parser.ParseURL(url)
+
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ if len(feed.Items) < count {
+ log.Fatalf("couldn't find %d items", count)
+ }
+
+ fmt.Printf("Src: %s (%s)\n---\n", feed.Title, url)
+
+ for i := 0; i < count; i++ {
+ fmt.Printf("%s\n", feed.Items[i].Title)
+ }
+
+ fmt.Println()
+ }
+}
+
+func nist() {
+ v1URL := "https://beacon.nist.gov/rest/record/last"
+ v2URL := "https://beacon.nist.gov/beacon/2.0/pulse/last"
+
+ resp, err := http.Get(v1URL)
+
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ v1XML, err := ioutil.ReadAll(resp.Body)
+
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ if err := resp.Body.Close(); err != nil {
+ log.Fatal(err)
+ }
+
+ var v1 struct {
+ XMLName xml.Name `xml:"record"`
+ OutputValue string `xml:"outputValue"`
+ }
+
+ if err := xml.Unmarshal(v1XML, &v1); err != nil {
+ log.Fatal(err)
+ }
+
+ fmt.Printf("Src: NIST Beacon v1 (%s)\n---\n", v1URL)
+ fmt.Printf("%s\n\n", v1.OutputValue)
+
+ resp, err = http.Get(v2URL)
+
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ v2JSON, err := ioutil.ReadAll(resp.Body)
+
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ if err := resp.Body.Close(); err != nil {
+ log.Fatal(err)
+ }
+
+ var v2 struct {
+ Pulse struct {
+ OutputValue string
+ }
+ }
+
+ if err := json.Unmarshal(v2JSON, &v2); err != nil {
+ log.Fatal(err)
+ }
+
+ fmt.Printf("Src: NIST Beacon v2 (%s)\n---\n", v2URL)
+ fmt.Printf("%s\n\n", v2.Pulse.OutputValue)
+
+}
+
+func btc() {
+ btcURL := "https://blockchain.info/blocks/?format=json"
+
+ resp, err := http.Get(btcURL)
+
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ btcJSON, err := ioutil.ReadAll(resp.Body)
+
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ if err := resp.Body.Close(); err != nil {
+ log.Fatal(err)
+ }
+
+ var btc struct {
+ Blocks []struct {
+ Hash string
+ }
+ }
+
+ if err := json.Unmarshal(btcJSON, &btc); err != nil {
+ log.Fatal(err)
+ }
+
+ depth := 10
+
+ if len(btc.Blocks) < depth {
+ log.Fatalf("len(btc.Blocks) < %d", depth)
+ }
+
+ fmt.Printf("Src: Blockchain.Info [block depth %d] (%s)\n---\n",
+ depth, btcURL)
+ fmt.Printf("%s\n\n", btc.Blocks[10].Hash)
+}
+
+func monero() {
+ monStatURL := "https://moneroblocks.info/api/get_stats"
+ monURL := "https://moneroblocks.info/api/get_block_header/%d"
+
+ resp, err := http.Get(monStatURL)
+
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ monJSON, err := ioutil.ReadAll(resp.Body)
+
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ if err := resp.Body.Close(); err != nil {
+ log.Fatal(err)
+ }
+
+ var monStats struct {
+ Height int64
+ }
+
+ if err := json.Unmarshal(monJSON, &monStats); err != nil {
+ log.Fatal(err)
+ }
+
+ depth := int64(10)
+
+ if monStats.Height < depth {
+ log.Fatalf("monStats.Height < %d", depth)
+ }
+
+ resp, err = http.Get(fmt.Sprintf(monURL, monStats.Height-depth))
+
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ monJSON, err = ioutil.ReadAll(resp.Body)
+
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ if err := resp.Body.Close(); err != nil {
+ log.Fatal(err)
+ }
+
+ var monBlockHdr struct {
+ BlockHeader struct {
+ Hash string
+ } `json:"block_header"`
+ }
+
+ if err := json.Unmarshal(monJSON, &monBlockHdr); err != nil {
+ log.Fatal(err)
+ }
+
+ fmt.Printf("Src: Moneroblocks.Info [block depth %d] (%s)\n---\n",
+ depth,
+ fmt.Sprintf(monURL, monStats.Height-depth))
+ fmt.Printf("%s\n\n", monBlockHdr.BlockHeader.Hash)
+
+}