diff options
Diffstat (limited to 'Godeps/_workspace/src/github.com/obscuren/ecies/asn1.go')
| -rw-r--r-- | Godeps/_workspace/src/github.com/obscuren/ecies/asn1.go | 556 |
1 files changed, 0 insertions, 556 deletions
diff --git a/Godeps/_workspace/src/github.com/obscuren/ecies/asn1.go b/Godeps/_workspace/src/github.com/obscuren/ecies/asn1.go deleted file mode 100644 index 3ef194ea0..000000000 --- a/Godeps/_workspace/src/github.com/obscuren/ecies/asn1.go +++ /dev/null @@ -1,556 +0,0 @@ -package ecies - -import ( - "bytes" - "crypto" - "crypto/elliptic" - "crypto/sha1" - "crypto/sha256" - "crypto/sha512" - "encoding/asn1" - "encoding/pem" - "fmt" - "hash" - "math/big" -) - -var ( - secgScheme = []int{1, 3, 132, 1} - shaScheme = []int{2, 16, 840, 1, 101, 3, 4, 2} - ansiX962Scheme = []int{1, 2, 840, 10045} - x963Scheme = []int{1, 2, 840, 63, 0} -) - -var ErrInvalidPrivateKey = fmt.Errorf("ecies: invalid private key") - -func doScheme(base, v []int) asn1.ObjectIdentifier { - var oidInts asn1.ObjectIdentifier - oidInts = append(oidInts, base...) - return append(oidInts, v...) -} - -// curve OID code taken from crypto/x509, including -// - oidNameCurve* -// - namedCurveFromOID -// - oidFromNamedCurve -// RFC 5480, 2.1.1.1. Named Curve -// -// secp224r1 OBJECT IDENTIFIER ::= { -// iso(1) identified-organization(3) certicom(132) curve(0) 33 } -// -// secp256r1 OBJECT IDENTIFIER ::= { -// iso(1) member-body(2) us(840) ansi-X9-62(10045) curves(3) -// prime(1) 7 } -// -// secp384r1 OBJECT IDENTIFIER ::= { -// iso(1) identified-organization(3) certicom(132) curve(0) 34 } -// -// secp521r1 OBJECT IDENTIFIER ::= { -// iso(1) identified-organization(3) certicom(132) curve(0) 35 } -// -// NB: secp256r1 is equivalent to prime256v1 -type secgNamedCurve asn1.ObjectIdentifier - -var ( - secgNamedCurveP224 = secgNamedCurve{1, 3, 132, 0, 33} - secgNamedCurveP256 = secgNamedCurve{1, 2, 840, 10045, 3, 1, 7} - secgNamedCurveP384 = secgNamedCurve{1, 3, 132, 0, 34} - secgNamedCurveP521 = secgNamedCurve{1, 3, 132, 0, 35} - rawCurveP224 = []byte{6, 5, 4, 3, 1, 2, 9, 4, 0, 3, 3} - rawCurveP256 = []byte{6, 8, 4, 2, 1, 3, 4, 7, 2, 2, 0, 6, 6, 1, 3, 1, 7} - rawCurveP384 = []byte{6, 5, 4, 3, 1, 2, 9, 4, 0, 3, 4} - rawCurveP521 = []byte{6, 5, 4, 3, 1, 2, 9, 4, 0, 3, 5} -) - -func rawCurve(curve elliptic.Curve) []byte { - switch curve { - case elliptic.P224(): - return rawCurveP224 - case elliptic.P256(): - return rawCurveP256 - case elliptic.P384(): - return rawCurveP384 - case elliptic.P521(): - return rawCurveP521 - default: - return nil - } -} - -func (curve secgNamedCurve) Equal(curve2 secgNamedCurve) bool { - if len(curve) != len(curve2) { - return false - } - for i, _ := range curve { - if curve[i] != curve2[i] { - return false - } - } - return true -} - -func namedCurveFromOID(curve secgNamedCurve) elliptic.Curve { - switch { - case curve.Equal(secgNamedCurveP224): - return elliptic.P224() - case curve.Equal(secgNamedCurveP256): - return elliptic.P256() - case curve.Equal(secgNamedCurveP384): - return elliptic.P384() - case curve.Equal(secgNamedCurveP521): - return elliptic.P521() - } - return nil -} - -func oidFromNamedCurve(curve elliptic.Curve) (secgNamedCurve, bool) { - switch curve { - case elliptic.P224(): - return secgNamedCurveP224, true - case elliptic.P256(): - return secgNamedCurveP256, true - case elliptic.P384(): - return secgNamedCurveP384, true - case elliptic.P521(): - return secgNamedCurveP521, true - } - - return nil, false -} - -// asnAlgorithmIdentifier represents the ASN.1 structure of the same name. See RFC -// 5280, section 4.1.1.2. -type asnAlgorithmIdentifier struct { - Algorithm asn1.ObjectIdentifier - Parameters asn1.RawValue `asn1:"optional"` -} - -func (a asnAlgorithmIdentifier) Cmp(b asnAlgorithmIdentifier) bool { - if len(a.Algorithm) != len(b.Algorithm) { - return false - } - for i, _ := range a.Algorithm { - if a.Algorithm[i] != b.Algorithm[i] { - return false - } - } - return true -} - -type asnHashFunction asnAlgorithmIdentifier - -var ( - oidSHA1 = asn1.ObjectIdentifier{1, 3, 14, 3, 2, 26} - oidSHA224 = doScheme(shaScheme, []int{4}) - oidSHA256 = doScheme(shaScheme, []int{1}) - oidSHA384 = doScheme(shaScheme, []int{2}) - oidSHA512 = doScheme(shaScheme, []int{3}) -) - -func hashFromOID(oid asn1.ObjectIdentifier) func() hash.Hash { - switch { - case oid.Equal(oidSHA1): - return sha1.New - case oid.Equal(oidSHA224): - return sha256.New224 - case oid.Equal(oidSHA256): - return sha256.New - case oid.Equal(oidSHA384): - return sha512.New384 - case oid.Equal(oidSHA512): - return sha512.New - } - return nil -} - -func oidFromHash(hash crypto.Hash) (asn1.ObjectIdentifier, bool) { - switch hash { - case crypto.SHA1: - return oidSHA1, true - case crypto.SHA224: - return oidSHA224, true - case crypto.SHA256: - return oidSHA256, true - case crypto.SHA384: - return oidSHA384, true - case crypto.SHA512: - return oidSHA512, true - default: - return nil, false - } -} - -var ( - asnAlgoSHA1 = asnHashFunction{ - Algorithm: oidSHA1, - } - asnAlgoSHA224 = asnHashFunction{ - Algorithm: oidSHA224, - } - asnAlgoSHA256 = asnHashFunction{ - Algorithm: oidSHA256, - } - asnAlgoSHA384 = asnHashFunction{ - Algorithm: oidSHA384, - } - asnAlgoSHA512 = asnHashFunction{ - Algorithm: oidSHA512, - } -) - -// type ASNasnSubjectPublicKeyInfo struct { -// -// } -// - -type asnSubjectPublicKeyInfo struct { - Algorithm asn1.ObjectIdentifier - PublicKey asn1.BitString - Supplements ecpksSupplements `asn1:"optional"` -} - -type asnECPKAlgorithms struct { - Type asn1.ObjectIdentifier -} - -var idPublicKeyType = doScheme(ansiX962Scheme, []int{2}) -var idEcPublicKey = doScheme(idPublicKeyType, []int{1}) -var idEcPublicKeySupplemented = doScheme(idPublicKeyType, []int{0}) - -func curveToRaw(curve elliptic.Curve) (rv asn1.RawValue, ok bool) { - switch curve { - case elliptic.P224(), elliptic.P256(), elliptic.P384(), elliptic.P521(): - raw := rawCurve(curve) - return asn1.RawValue{ - Tag: 30, - Bytes: raw[2:], - FullBytes: raw, - }, true - default: - return rv, false - } -} - -func asnECPublicKeyType(curve elliptic.Curve) (algo asnAlgorithmIdentifier, ok bool) { - raw, ok := curveToRaw(curve) - if !ok { - return - } else { - return asnAlgorithmIdentifier{Algorithm: idEcPublicKey, - Parameters: raw}, true - } -} - -type asnECPrivKeyVer int - -var asnECPrivKeyVer1 asnECPrivKeyVer = 1 - -type asnPrivateKey struct { - Version asnECPrivKeyVer - Private []byte - Curve secgNamedCurve `asn1:"optional"` - Public asn1.BitString -} - -var asnECDH = doScheme(secgScheme, []int{12}) - -type asnECDHAlgorithm asnAlgorithmIdentifier - -var ( - dhSinglePass_stdDH_sha1kdf = asnECDHAlgorithm{ - Algorithm: doScheme(x963Scheme, []int{2}), - } - dhSinglePass_stdDH_sha256kdf = asnECDHAlgorithm{ - Algorithm: doScheme(secgScheme, []int{11, 1}), - } - dhSinglePass_stdDH_sha384kdf = asnECDHAlgorithm{ - Algorithm: doScheme(secgScheme, []int{11, 2}), - } - dhSinglePass_stdDH_sha224kdf = asnECDHAlgorithm{ - Algorithm: doScheme(secgScheme, []int{11, 0}), - } - dhSinglePass_stdDH_sha512kdf = asnECDHAlgorithm{ - Algorithm: doScheme(secgScheme, []int{11, 3}), - } -) - -func (a asnECDHAlgorithm) Cmp(b asnECDHAlgorithm) bool { - if len(a.Algorithm) != len(b.Algorithm) { - return false - } - for i, _ := range a.Algorithm { - if a.Algorithm[i] != b.Algorithm[i] { - return false - } - } - return true -} - -// asnNISTConcatenation is the only supported KDF at this time. -type asnKeyDerivationFunction asnAlgorithmIdentifier - -var asnNISTConcatenationKDF = asnKeyDerivationFunction{ - Algorithm: doScheme(secgScheme, []int{17, 1}), -} - -func (a asnKeyDerivationFunction) Cmp(b asnKeyDerivationFunction) bool { - if len(a.Algorithm) != len(b.Algorithm) { - return false - } - for i, _ := range a.Algorithm { - if a.Algorithm[i] != b.Algorithm[i] { - return false - } - } - return true -} - -var eciesRecommendedParameters = doScheme(secgScheme, []int{7}) -var eciesSpecifiedParameters = doScheme(secgScheme, []int{8}) - -type asnECIESParameters struct { - KDF asnKeyDerivationFunction `asn1:"optional"` - Sym asnSymmetricEncryption `asn1:"optional"` - MAC asnMessageAuthenticationCode `asn1:"optional"` -} - -type asnSymmetricEncryption asnAlgorithmIdentifier - -var ( - aes128CTRinECIES = asnSymmetricEncryption{ - Algorithm: doScheme(secgScheme, []int{21, 0}), - } - aes192CTRinECIES = asnSymmetricEncryption{ - Algorithm: doScheme(secgScheme, []int{21, 1}), - } - aes256CTRinECIES = asnSymmetricEncryption{ - Algorithm: doScheme(secgScheme, []int{21, 2}), - } -) - -func (a asnSymmetricEncryption) Cmp(b asnSymmetricEncryption) bool { - if len(a.Algorithm) != len(b.Algorithm) { - return false - } - for i, _ := range a.Algorithm { - if a.Algorithm[i] != b.Algorithm[i] { - return false - } - } - return true -} - -type asnMessageAuthenticationCode asnAlgorithmIdentifier - -var ( - hmacFull = asnMessageAuthenticationCode{ - Algorithm: doScheme(secgScheme, []int{22}), - } -) - -func (a asnMessageAuthenticationCode) Cmp(b asnMessageAuthenticationCode) bool { - if len(a.Algorithm) != len(b.Algorithm) { - return false - } - for i, _ := range a.Algorithm { - if a.Algorithm[i] != b.Algorithm[i] { - return false - } - } - return true -} - -type ecpksSupplements struct { - ECDomain secgNamedCurve - ECCAlgorithms eccAlgorithmSet -} - -type eccAlgorithmSet struct { - ECDH asnECDHAlgorithm `asn1:"optional"` - ECIES asnECIESParameters `asn1:"optional"` -} - -func marshalSubjectPublicKeyInfo(pub *PublicKey) (subj asnSubjectPublicKeyInfo, err error) { - subj.Algorithm = idEcPublicKeySupplemented - curve, ok := oidFromNamedCurve(pub.Curve) - if !ok { - err = ErrInvalidPublicKey - return - } - subj.Supplements.ECDomain = curve - if pub.Params != nil { - subj.Supplements.ECCAlgorithms.ECDH = paramsToASNECDH(pub.Params) - subj.Supplements.ECCAlgorithms.ECIES = paramsToASNECIES(pub.Params) - } - pubkey := elliptic.Marshal(pub.Curve, pub.X, pub.Y) - subj.PublicKey = asn1.BitString{ - BitLength: len(pubkey) * 8, - Bytes: pubkey, - } - return -} - -// Encode a public key to DER format. -func MarshalPublic(pub *PublicKey) ([]byte, error) { - subj, err := marshalSubjectPublicKeyInfo(pub) - if err != nil { - return nil, err - } - return asn1.Marshal(subj) -} - -// Decode a DER-encoded public key. -func UnmarshalPublic(in []byte) (pub *PublicKey, err error) { - var subj asnSubjectPublicKeyInfo - - if _, err = asn1.Unmarshal(in, &subj); err != nil { - return - } - if !subj.Algorithm.Equal(idEcPublicKeySupplemented) { - err = ErrInvalidPublicKey - return - } - pub = new(PublicKey) - pub.Curve = namedCurveFromOID(subj.Supplements.ECDomain) - x, y := elliptic.Unmarshal(pub.Curve, subj.PublicKey.Bytes) - if x == nil { - err = ErrInvalidPublicKey - return - } - pub.X = x - pub.Y = y - pub.Params = new(ECIESParams) - asnECIEStoParams(subj.Supplements.ECCAlgorithms.ECIES, pub.Params) - asnECDHtoParams(subj.Supplements.ECCAlgorithms.ECDH, pub.Params) - if pub.Params == nil { - if pub.Params = ParamsFromCurve(pub.Curve); pub.Params == nil { - err = ErrInvalidPublicKey - } - } - return -} - -func marshalPrivateKey(prv *PrivateKey) (ecprv asnPrivateKey, err error) { - ecprv.Version = asnECPrivKeyVer1 - ecprv.Private = prv.D.Bytes() - - var ok bool - ecprv.Curve, ok = oidFromNamedCurve(prv.PublicKey.Curve) - if !ok { - err = ErrInvalidPrivateKey - return - } - - var pub []byte - if pub, err = MarshalPublic(&prv.PublicKey); err != nil { - return - } else { - ecprv.Public = asn1.BitString{ - BitLength: len(pub) * 8, - Bytes: pub, - } - } - return -} - -// Encode a private key to DER format. -func MarshalPrivate(prv *PrivateKey) ([]byte, error) { - ecprv, err := marshalPrivateKey(prv) - if err != nil { - return nil, err - } - return asn1.Marshal(ecprv) -} - -// Decode a private key from a DER-encoded format. -func UnmarshalPrivate(in []byte) (prv *PrivateKey, err error) { - var ecprv asnPrivateKey - - if _, err = asn1.Unmarshal(in, &ecprv); err != nil { - return - } else if ecprv.Version != asnECPrivKeyVer1 { - err = ErrInvalidPrivateKey - return - } - - privateCurve := namedCurveFromOID(ecprv.Curve) - if privateCurve == nil { - err = ErrInvalidPrivateKey - return - } - - prv = new(PrivateKey) - prv.D = new(big.Int).SetBytes(ecprv.Private) - - if pub, err := UnmarshalPublic(ecprv.Public.Bytes); err != nil { - return nil, err - } else { - prv.PublicKey = *pub - } - - return -} - -// Export a public key to PEM format. -func ExportPublicPEM(pub *PublicKey) (out []byte, err error) { - der, err := MarshalPublic(pub) - if err != nil { - return - } - - var block pem.Block - block.Type = "ELLIPTIC CURVE PUBLIC KEY" - block.Bytes = der - - buf := new(bytes.Buffer) - err = pem.Encode(buf, &block) - if err != nil { - return - } else { - out = buf.Bytes() - } - return -} - -// Export a private key to PEM format. -func ExportPrivatePEM(prv *PrivateKey) (out []byte, err error) { - der, err := MarshalPrivate(prv) - if err != nil { - return - } - - var block pem.Block - block.Type = "ELLIPTIC CURVE PRIVATE KEY" - block.Bytes = der - - buf := new(bytes.Buffer) - err = pem.Encode(buf, &block) - if err != nil { - return - } else { - out = buf.Bytes() - } - return -} - -// Import a PEM-encoded public key. -func ImportPublicPEM(in []byte) (pub *PublicKey, err error) { - p, _ := pem.Decode(in) - if p == nil || p.Type != "ELLIPTIC CURVE PUBLIC KEY" { - return nil, ErrInvalidPublicKey - } - - pub, err = UnmarshalPublic(p.Bytes) - return -} - -// Import a PEM-encoded private key. -func ImportPrivatePEM(in []byte) (prv *PrivateKey, err error) { - p, _ := pem.Decode(in) - if p == nil || p.Type != "ELLIPTIC CURVE PRIVATE KEY" { - return nil, ErrInvalidPrivateKey - } - - prv, err = UnmarshalPrivate(p.Bytes) - return -} |