Janady13/missionmatch / internal/platform/security/recovery.go

Source identity

Field	Recorded value
Source type	GitHub source
Original record	Janady13/missionmatch / internal/platform/security/recovery.go
Date	Not specified in source
Repository	Janady13/missionmatch
Revision	720d47fae476b0d38477ae4401697d372b1ea2bc
Branch	feature/opportunity-to-outcome
Path or archive member	internal/platform/security/recovery.go
Original SHA-256	7a1df8f8d94f3979f50bf2d7860f6c2921cca98e33fbe4680948204ed0265868
Git blob SHA	854966303572d20078b6dee5de907154d3050fbf
Reading-copy SHA-256	7a1df8f8d94f3979f50bf2d7860f6c2921cca98e33fbe4680948204ed0265868

Original source ↗

Every recorded occurrence

These 36 records contain identical original source bytes. Their paths and revisions remain part of the archive.

Original record	Branch or archive	Revision / identifier	Original location
Janady13/missionmatch / internal/platform/security/recovery.go	feature/opportunity-to-outcome	720d47fae476b0d38477ae4401697d372b1ea2bc	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	per-tenant-routing	9bde0f9a74b89d01980fa658e5253acda7528d0c	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	collision-deconfliction	4ee5a09972608ed89f8377c6665542d5f450f0a6	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	ws6-retrieval	6c56e29231ec05735927fa265c97d517499dfeaf	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	workstream-a-shared-core	e0de03ac3a1ec826bd15d0e048e3b02baa23eeff	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	m5-price-to-win	41000ad30fff4129fdaf5ec84e15ba14c27d4890	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	workstream-c-slatematch	5cd60c918301b46ecd6ed3e03e20c395da0062e2	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	ws1-ontology-sync	b596f449a32a1016fbd403c36505cc00a1ac9ee6	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	master	1e9249840a4302ec82e123b9c9cb6f75badea3e4	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	ws8-teaching-loop	c823f0fb6bb2aba0f39001eb6de96f4000d9321f	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	w3-ai-staffing-recommendations	43d56387270ef4da4cabd794d97ca6a49909bc7d	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	mag-substrate	b82c7100a492dec67dfd1eda6b3f53def859be35	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	ws3-clearance	4b8e7ce594c068621867f9c9deed0ec64ae6c553	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	workstream-d-command-center	255e7d1d420abf5e277d0cd8c9b14f6f72b6acb9	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	phase2-eval-fairness	d361af254701975fe239927656ababb56374655e	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	workstream-e-dataflow-deploy	433815a042f9741411e60fa553fe72143e9b10db	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	ruthless-debug-sweep	b7d742f8f032984be3817efffa3eb8b13b651c1f	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	time-to-fill-survival	b66e1e505863d4f17741a4b9ede73509e45bd6c6	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	ai-intelligence-layer	5d5ddff70393a197c5f54a45280bb5dd42b24755	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	graphrag-foundation	b0ddeb9f633fd138d09309d1a17b7d13bc3a67f7	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	workstream-a-opportunity-intelligence	1675031db74316e100782d063e9eda1a597fe3a1	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	deploy-and-ops	bdacd9d0b4d5998d25fc74bf4007f4c3ec538c7a	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	ws9-bench-ingestion	f585a9ef32fa554663ce1fba9a414a54b6e49cf0	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	ws2-alias-relationship	e4dada4601c6eb101830f9d223a9655dfa120616	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	presentation-readiness	eb574acaa29d71ce4d0f852572e87c275c79fdb7	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	vendor-intelligence	fe9796a19c261951d3f2565206c0c1b5ac294465	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	workstream-b-screenmatch	09015496d565a172bcaa15cfe9a8e4b072b13df0	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	ws7-federal-signal	6a9f6ce9cfb13345ffb47770d4960e7c2d9c17c2	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	workstream-e-commercial-stubs	4437da660539284a400ee380b9b427a300c369ee	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	ai-brain-live	aac32fc49c878cc5bca099459307611562d0bac1	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	workstream-d-missionmatch	3be46ba89edb737182075a2b320509b42dc916f8	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	phase2-connectors	e038d4c687aec16f8bd9bc4d907eea14d91f8704	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	workstream-b-sam-contract-awards	d5101cceb98e70000cebb31d3e7ac73d747d3a6d	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	w0-aedt-compliance	39df94f92b2a33f852481fe1954dabed841524bb	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	feature/aioe-upgrade	2178e7298d0e5d9af83afa12402fd587f0ba6ed8	Open original
Janady13/missionmatch / internal/platform/security/recovery.go	capture-readiness	bae6af7cb2997e819174a9e9cfff5e16067a1975	Open original

Recovered source transcript

Download complete source text ↓63 lines · 1.9 KB

package security

import (
	"crypto/hmac"
	"crypto/rand"
	"crypto/sha256"
	"encoding/base32"
	"errors"
	"fmt"
)

const (
	recoveryCodeBytes  = 10 // 80 bits of entropy, 16 base32 characters
	defaultRecoveryNum = 10
)

var recoveryBase32 = base32.StdEncoding.WithPadding(base32.NoPadding)

// GenerateRecoveryCodes returns count single use backup codes in plaintext. They are shown to the
// user exactly once; the database stores only their PBKDF2 hash plus a lookup tag (see Tagger). Each
// code is unpadded base32 with no separators, so it carries no display punctuation.
func GenerateRecoveryCodes(count int) ([]string, error) {
	if count <= 0 {
		count = defaultRecoveryNum
	}
	codes := make([]string, 0, count)
	for i := 0; i < count; i++ {
		b := make([]byte, recoveryCodeBytes)
		if _, err := rand.Read(b); err != nil {
			return nil, fmt.Errorf("security: read recovery code: %w", err)
		}
		codes = append(codes, recoveryBase32.EncodeToString(b))
	}
	return codes, nil
}

// Tagger derives a non secret lookup tag for a value with HMAC SHA 256 under a server held key. A
// recovery attempt looks up the candidate row by tag and then runs exactly one PBKDF2 verify against
// that row, instead of looping the submitted code against every stored 600000 iteration hash. That
// closes the recovery code CPU amplification path while keeping the tag useless to anyone without
// the server key.
type Tagger struct{ key []byte }

// NewTagger builds a Tagger from a server held key.
func NewTagger(key []byte) (*Tagger, error) {
	if len(key) == 0 {
		return nil, errors.New("security: tagger needs a non empty key")
	}
	b := make([]byte, len(key))
	copy(b, key)
	return &Tagger{key: b}, nil
}

// Tag returns the lookup tag for a value.
func (t *Tagger) Tag(value string) []byte {
	mac := hmac.New(sha256.New, t.key)
	mac.Write([]byte(value))
	return mac.Sum(nil)
}

// Equal compares two tags in constant time.
func (t *Tagger) Equal(a, b []byte) bool { return hmac.Equal(a, b) }