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@ -27,10 +27,13 @@ import ( |
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"github.com/keybase/go-crypto/openpgp/ecdh" |
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"github.com/keybase/go-crypto/openpgp/elgamal" |
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"github.com/keybase/go-crypto/openpgp/errors" |
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"github.com/keybase/go-crypto/openpgp/s2k" |
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"github.com/keybase/go-crypto/rsa" |
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) |
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var ( |
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// NIST curve P-224
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oidCurveP224 []byte = []byte{0x2B, 0x81, 0x04, 0x00, 0x21} |
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// NIST curve P-256
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oidCurveP256 []byte = []byte{0x2A, 0x86, 0x48, 0xCE, 0x3D, 0x03, 0x01, 0x07} |
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// NIST curve P-384
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@ -128,6 +131,8 @@ func (f *ecdsaKey) serialize(w io.Writer) (err error) { |
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func getCurveByOid(oid []byte) elliptic.Curve { |
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switch { |
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case bytes.Equal(oid, oidCurveP224): |
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return elliptic.P224() |
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case bytes.Equal(oid, oidCurveP256): |
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return elliptic.P256() |
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case bytes.Equal(oid, oidCurveP384): |
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@ -324,6 +329,30 @@ func NewElGamalPublicKey(creationTime time.Time, pub *elgamal.PublicKey) *Public |
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return pk |
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} |
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func getCurveOid(curve elliptic.Curve) (res []byte, err error) { |
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switch curve { |
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case elliptic.P224(): |
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res = oidCurveP224 |
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case elliptic.P256(): |
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res = oidCurveP256 |
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case elliptic.P384(): |
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res = oidCurveP384 |
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case elliptic.P521(): |
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res = oidCurveP521 |
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case brainpool.P256r1(): |
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res = oidCurveP256r1 |
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case brainpool.P384r1(): |
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res = oidCurveP384r1 |
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case brainpool.P512r1(): |
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res = oidCurveP512r1 |
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case curve25519.Cv25519(): |
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res = oidCurve25519 |
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default: |
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err = errors.UnsupportedError("unknown curve") |
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} |
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return |
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} |
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func NewECDSAPublicKey(creationTime time.Time, pub *ecdsa.PublicKey) *PublicKey { |
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pk := &PublicKey{ |
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CreationTime: creationTime, |
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@ -331,22 +360,34 @@ func NewECDSAPublicKey(creationTime time.Time, pub *ecdsa.PublicKey) *PublicKey |
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PublicKey: pub, |
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ec: new(ecdsaKey), |
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} |
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switch pub.Curve { |
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case elliptic.P256(): |
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pk.ec.oid = oidCurveP256 |
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case elliptic.P384(): |
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pk.ec.oid = oidCurveP384 |
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case elliptic.P521(): |
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pk.ec.oid = oidCurveP521 |
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case brainpool.P256r1(): |
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pk.ec.oid = oidCurveP256r1 |
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case brainpool.P384r1(): |
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pk.ec.oid = oidCurveP384r1 |
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case brainpool.P512r1(): |
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pk.ec.oid = oidCurveP512r1 |
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oid, _ := getCurveOid(pub.Curve) |
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pk.ec.oid = oid |
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bs, bitLen := ecdh.Marshal(pub.Curve, pub.X, pub.Y) |
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pk.ec.p.bytes = bs |
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pk.ec.p.bitLength = uint16(bitLen) |
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pk.setFingerPrintAndKeyId() |
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return pk |
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} |
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func NewECDHPublicKey(creationTime time.Time, pub *ecdh.PublicKey) *PublicKey { |
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pk := &PublicKey{ |
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CreationTime: creationTime, |
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PubKeyAlgo: PubKeyAlgoECDH, |
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PublicKey: pub, |
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ec: new(ecdsaKey), |
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} |
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oid, _ := getCurveOid(pub.Curve) |
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pk.ec.oid = oid |
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bs, bitLen := ecdh.Marshal(pub.Curve, pub.X, pub.Y) |
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pk.ec.p.bytes = bs |
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pk.ec.p.bitLength = uint16(bitLen) |
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hashbyte, _ := s2k.HashToHashId(crypto.SHA512) |
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pk.ecdh = &ecdhKdf{ |
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KdfHash: kdfHashFunction(hashbyte), |
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KdfAlgo: kdfAlgorithm(CipherAES256), |
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} |
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pk.ec.p.bytes = elliptic.Marshal(pub.Curve, pub.X, pub.Y) |
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pk.ec.p.bitLength = uint16(8 * len(pk.ec.p.bytes)) |
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pk.setFingerPrintAndKeyId() |
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return pk |
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@ -377,6 +418,9 @@ func (pk *PublicKey) parse(r io.Reader) (err error) { |
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return err |
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} |
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err = pk.edk.check() |
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if err == nil { |
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pk.PublicKey = ed25519.PublicKey(pk.edk.p.bytes[1:]) |
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} |
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case PubKeyAlgoECDSA: |
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pk.ec = new(ecdsaKey) |
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if err = pk.ec.parse(r); err != nil { |
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@ -393,6 +437,14 @@ func (pk *PublicKey) parse(r io.Reader) (err error) { |
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return |
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} |
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pk.PublicKey, err = pk.ec.newECDH() |
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case PubKeyAlgoBadElGamal: |
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// Key has ElGamal format but nil-implementation - it will
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// load but it's not possible to do any operations using this
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// key.
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err = pk.parseElGamal(r) |
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if err != nil { |
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pk.PublicKey = nil |
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} |
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default: |
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err = errors.UnsupportedError("public key type: " + strconv.Itoa(int(pk.PubKeyAlgo))) |
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} |
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@ -433,6 +485,8 @@ func (pk *PublicKey) parseRSA(r io.Reader) (err error) { |
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N: new(big.Int).SetBytes(pk.n.bytes), |
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E: 0, |
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} |
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// Warning: incompatibility with crypto/rsa: keybase fork uses
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// int64 public exponents instead of int32.
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for i := 0; i < len(pk.e.bytes); i++ { |
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rsa.E <<= 8 |
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rsa.E |= int64(pk.e.bytes[i]) |
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@ -508,7 +562,7 @@ func (pk *PublicKey) SerializeSignaturePrefix(h io.Writer) { |
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pLength += 2 + uint16(len(pk.q.bytes)) |
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pLength += 2 + uint16(len(pk.g.bytes)) |
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pLength += 2 + uint16(len(pk.y.bytes)) |
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case PubKeyAlgoElGamal: |
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case PubKeyAlgoElGamal, PubKeyAlgoBadElGamal: |
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pLength += 2 + uint16(len(pk.p.bytes)) |
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pLength += 2 + uint16(len(pk.g.bytes)) |
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pLength += 2 + uint16(len(pk.y.bytes)) |
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@ -539,7 +593,7 @@ func (pk *PublicKey) Serialize(w io.Writer) (err error) { |
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length += 2 + len(pk.q.bytes) |
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length += 2 + len(pk.g.bytes) |
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length += 2 + len(pk.y.bytes) |
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case PubKeyAlgoElGamal: |
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case PubKeyAlgoElGamal, PubKeyAlgoBadElGamal: |
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length += 2 + len(pk.p.bytes) |
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length += 2 + len(pk.g.bytes) |
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length += 2 + len(pk.y.bytes) |
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@ -587,7 +641,7 @@ func (pk *PublicKey) serializeWithoutHeaders(w io.Writer) (err error) { |
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return writeMPIs(w, pk.n, pk.e) |
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case PubKeyAlgoDSA: |
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return writeMPIs(w, pk.p, pk.q, pk.g, pk.y) |
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case PubKeyAlgoElGamal: |
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case PubKeyAlgoElGamal, PubKeyAlgoBadElGamal: |
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return writeMPIs(w, pk.p, pk.g, pk.y) |
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case PubKeyAlgoECDSA: |
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return pk.ec.serialize(w) |
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@ -637,7 +691,7 @@ func (pk *PublicKey) VerifySignature(signed hash.Hash, sig *Signature) (err erro |
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switch pk.PubKeyAlgo { |
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case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly: |
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rsaPublicKey, _ := pk.PublicKey.(*rsa.PublicKey) |
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err = rsa.VerifyPKCS1v15(rsaPublicKey, sig.Hash, hashBytes, sig.RSASignature.bytes) |
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err = rsa.VerifyPKCS1v15(rsaPublicKey, sig.Hash, hashBytes, padToKeySize(rsaPublicKey, sig.RSASignature.bytes)) |
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if err != nil { |
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return errors.SignatureError("RSA verification failure") |
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} |
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@ -694,7 +748,7 @@ func (pk *PublicKey) VerifySignatureV3(signed hash.Hash, sig *SignatureV3) (err |
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switch pk.PubKeyAlgo { |
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case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly: |
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rsaPublicKey := pk.PublicKey.(*rsa.PublicKey) |
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if err = rsa.VerifyPKCS1v15(rsaPublicKey, sig.Hash, hashBytes, sig.RSASignature.bytes); err != nil { |
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if err = rsa.VerifyPKCS1v15(rsaPublicKey, sig.Hash, hashBytes, padToKeySize(rsaPublicKey, sig.RSASignature.bytes)); err != nil { |
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return errors.SignatureError("RSA verification failure") |
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} |
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return |
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@ -910,7 +964,7 @@ func (pk *PublicKey) BitLength() (bitLength uint16, err error) { |
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bitLength = pk.n.bitLength |
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case PubKeyAlgoDSA: |
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bitLength = pk.p.bitLength |
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case PubKeyAlgoElGamal: |
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case PubKeyAlgoElGamal, PubKeyAlgoBadElGamal: |
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bitLength = pk.p.bitLength |
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case PubKeyAlgoECDH: |
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ecdhPublicKey := pk.PublicKey.(*ecdh.PublicKey) |
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@ -928,3 +982,12 @@ func (pk *PublicKey) BitLength() (bitLength uint16, err error) { |
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} |
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return |
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} |
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func (pk *PublicKey) ErrorIfDeprecated() error { |
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switch pk.PubKeyAlgo { |
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case PubKeyAlgoBadElGamal: |
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return errors.DeprecatedKeyError("ElGamal Encrypt or Sign (algo 20) is deprecated") |
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default: |
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return nil |
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} |
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} |
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6543
5 years ago
committed by
GitHub