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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,104 @@ | ||
| //Package isokey allows you to make and verify API keys without a database connection via HMAC signatures. | ||
| //The keys are scalable and persistent. All information is stored in the key, and with the client. | ||
| package isokey | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "crypto/ecdsa" | ||
| "crypto/sha256" | ||
| "encoding/binary" | ||
| "io/ioutil" | ||
| "time" | ||
|
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| "crypto/rand" | ||
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| "crypto/x509" | ||
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| "github.com/jbenet/go-base58" | ||
| ) | ||
|
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| //AsymKeySigner facilitates the creation ECDSA API keys | ||
| type AsymKeySigner struct { | ||
| //PrivateKey is used if GetPrivateKey and KeyMap is nil | ||
| PrivateKey *ecdsa.PrivateKey | ||
|
|
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| //PrivateKeyMap maps secret versions to secrets | ||
| PrivateKeyMap map[uint32]*ecdsa.PrivateKey | ||
|
|
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| //GetPrivateKey allows you to dynamically use secrets. | ||
| //Returning nil indicates that no secret was found for the version | ||
| GetPrivateKey func(key *Key) *ecdsa.PrivateKey | ||
| } | ||
|
|
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| //LoadPrivateKey loads an ASN.1 ECDSA private key from a file. | ||
| func LoadPrivateKey(filename string) (privKey *ecdsa.PrivateKey, err error) { | ||
| byt, err := ioutil.ReadFile(filename) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| privKey, err = x509.ParseECPrivateKey(byt) | ||
| return | ||
| } | ||
|
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| func (ks *AsymKeySigner) getPrivateKey(key *Key) (privKey *ecdsa.PrivateKey, err error) { | ||
| var ok bool | ||
| if ks.GetPrivateKey != nil { | ||
| privKey = ks.GetPrivateKey(key) | ||
| } else if ks.PrivateKeyMap != nil { | ||
| privKey, ok = ks.PrivateKeyMap[key.SecretVersion] | ||
| if !ok { | ||
| return privKey, ErrNoAsymKey | ||
| } | ||
| } else { | ||
| privKey = ks.PrivateKey | ||
| } | ||
|
|
||
| if privKey == nil { | ||
| return privKey, ErrNoAsymKey | ||
| } | ||
| return | ||
| } | ||
|
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| //Digest signs the API key and digests it into it's base58 form. | ||
| //An error will only be returned if the corresponding key cannot be found from SecretVersion. | ||
| //if key.Made is zero it is set to the current time. | ||
| func (ks *AsymKeySigner) Digest(key *Key) (digest string, err error) { | ||
| message := &bytes.Buffer{} | ||
|
|
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| if key.Made.IsZero() { | ||
| key.Made = time.Now() | ||
| } | ||
|
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| binary.Write(message, binary.BigEndian, uint32(key.Made.Unix())) | ||
| binary.Write(message, binary.BigEndian, uint32(key.Expires.Unix())) | ||
| binary.Write(message, binary.BigEndian, key.SecretVersion) | ||
| binary.Write(message, binary.BigEndian, key.UserID) | ||
| binary.Write(message, binary.BigEndian, key.Flags) | ||
|
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| privKey, err := ks.getPrivateKey(key) | ||
|
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| if err != nil { | ||
| return "", err | ||
| } | ||
|
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| checksum := sha256.Sum256(message.Bytes()) | ||
| signhash := checksum[:16] | ||
|
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| r, s, err := ecdsa.Sign(rand.Reader, privKey, signhash) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
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| digestBuf := &bytes.Buffer{} | ||
|
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| digestBuf.WriteByte(uint8(len(r.Bytes()))) | ||
| digestBuf.Write(r.Bytes()) | ||
| digestBuf.WriteByte(uint8(len(s.Bytes()))) | ||
| digestBuf.Write(s.Bytes()) | ||
|
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| //fmt.Printf("r %x s %x buf %x pkXY %s %s\n", r.Bytes(), s.Bytes(), message.Bytes(), privKey.PublicKey.X, privKey.PublicKey.Y) | ||
|
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| digestBuf.Write(message.Bytes()) | ||
|
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| return base58.Encode(digestBuf.Bytes()), nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| package isokey | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "testing" | ||
| "time" | ||
| ) | ||
|
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| func TestASymKeyDigest(t *testing.T) { | ||
| privKey, err := LoadPrivateKey("test_assets/privatekey.der") | ||
| if err != nil { | ||
| t.Errorf("Error loading private key: %v", err) | ||
| return | ||
| } | ||
|
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| keySigner := AsymKeySigner{ | ||
| PrivateKey: privKey, | ||
| } | ||
|
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| key := &Key{ | ||
| UserID: 1, | ||
| Expires: time.Now().AddDate(0, 1, 0), | ||
| } | ||
|
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| digest, err := keySigner.Digest(key) | ||
|
|
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| if err != nil { | ||
| t.Errorf("Error making digest: %v", err) | ||
| return | ||
| } | ||
|
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| fmt.Printf("Digest is %v\n", digest) | ||
|
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| pubKey, err := LoadPublicKey("test_assets/publickey.der") | ||
| if err != nil { | ||
| t.Errorf("Error loading public key: %v", err) | ||
| return | ||
| } | ||
| keyVerifier := AsymKeyVerifier{ | ||
| PublicKey: pubKey, | ||
| } | ||
|
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| key, err = keyVerifier.Verify(digest) | ||
|
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| if err != nil { | ||
| t.Errorf("Error verifying key: %v", err) | ||
| return | ||
| } | ||
|
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| fmt.Printf("Key is %+v", key) | ||
| } |
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