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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,160 @@ | ||
| // Copyright (c) Microsoft Corporation. | ||
| // Licensed under the MIT License. | ||
|
|
||
| //go:build windows | ||
| // +build windows | ||
|
|
||
| package cng | ||
|
|
||
| import ( | ||
| "errors" | ||
| "runtime" | ||
| "unsafe" | ||
|
|
||
| "github.com/microsoft/go-crypto-winnative/internal/bcrypt" | ||
| ) | ||
|
|
||
| type dsaAlgorithm struct { | ||
| handle bcrypt.ALG_HANDLE | ||
| } | ||
|
|
||
| func loadDSA() (h dsaAlgorithm, err error) { | ||
| v, err := loadOrStoreAlg(bcrypt.DSA_ALGORITHM, bcrypt.ALG_NONE_FLAG, "", func(h bcrypt.ALG_HANDLE) (interface{}, error) { | ||
| return dsaAlgorithm{h}, nil | ||
| }) | ||
| if err != nil { | ||
| return dsaAlgorithm{}, err | ||
| } | ||
| return v.(dsaAlgorithm), nil | ||
| } | ||
|
|
||
| type DSAParameters struct { | ||
| P, Q, G, S BigInt | ||
| } | ||
|
|
||
| func GenerateDSAParameters(l int) (DSAParameters, error) { | ||
| h, err := loadDSA() | ||
| if err != nil { | ||
| return DSAParameters{}, err | ||
| } | ||
| var hkey bcrypt.KEY_HANDLE | ||
| if err := bcrypt.GenerateKeyPair(h.handle, &hkey, uint32(l), 0); err != nil { | ||
| return DSAParameters{}, err | ||
| } | ||
| defer bcrypt.DestroyKey(hkey) | ||
|
|
||
| if err := bcrypt.FinalizeKeyPair(hkey, 0); err != nil { | ||
| return DSAParameters{}, err | ||
| } | ||
| if l <= 1024 { | ||
| hdr, data, err := exporDSAKey(hkey, false) | ||
| if err != nil { | ||
| return DSAParameters{}, err | ||
| } | ||
| if hdr.Magic != bcrypt.DSA_PUBLIC_MAGIC || hdr.KeySize*8 != uint32(l) { | ||
| return DSAParameters{}, errors.New("crypto/dsa: exported key is corrupted") | ||
| } | ||
| consumeBigInt := func(size uint32) BigInt { | ||
| b := data[:size] | ||
| data = data[size:] | ||
| return b | ||
| } | ||
| return DSAParameters{ | ||
| S: hdr.Seed[:], | ||
| Q: hdr.Q[:], | ||
| P: consumeBigInt(hdr.KeySize), | ||
| G: consumeBigInt(hdr.KeySize), | ||
| }, nil | ||
| } | ||
| hdr, data, err := exporDSAV2Key(hkey, false) | ||
| if err != nil { | ||
| return DSAParameters{}, err | ||
| } | ||
| if hdr.Magic != bcrypt.DSA_PUBLIC_MAGIC_V2 || hdr.KeySize*8 != uint32(l) { | ||
| return DSAParameters{}, errors.New("crypto/dsa: exported key is corrupted") | ||
| } | ||
| consumeBigInt := func(size uint32) BigInt { | ||
| b := data[:size] | ||
| data = data[size:] | ||
| return b | ||
| } | ||
| return DSAParameters{ | ||
| S: consumeBigInt(hdr.SeedLength), | ||
| Q: consumeBigInt(hdr.GroupSize), | ||
| P: consumeBigInt(hdr.KeySize), | ||
| G: consumeBigInt(hdr.KeySize), | ||
| }, nil | ||
| } | ||
|
|
||
| type DSAPrivateKey struct { | ||
| hkey bcrypt.KEY_HANDLE | ||
| } | ||
|
|
||
| func (k *DSAPrivateKey) finalize() { | ||
| bcrypt.DestroyKey(k.hkey) | ||
| } | ||
|
|
||
| func GenerateKey(params DSAParameters) (*DSAPrivateKey, error) { | ||
| h, err := loadDSA() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| keySize := uint32(len(params.P)) | ||
| groupSize := uint32(len(params.Q)) | ||
| seedSize := uint32(len(params.S)) | ||
| var hkey bcrypt.KEY_HANDLE | ||
| if err := bcrypt.GenerateKeyPair(h.handle, &hkey, keySize*8, 0); err != nil { | ||
| return nil, err | ||
| } | ||
| var blob []byte | ||
| if keySize*8 <= 1024 { | ||
| blob = make([]byte, sizeOfDSAParamsHeader+keySize*2) | ||
| hdr := bcrypt.DSA_PARAMETER_HEADER{ | ||
| Length: uint32(len(blob)), | ||
| Magic: bcrypt.DSA_PARAMETERS_MAGIC_V2, | ||
| KeySize: keySize, | ||
| //Count: , | ||
| } | ||
| copy(hdr.Seed[:], params.S[:]) | ||
| copy(hdr.Q[:], params.Q[:]) | ||
| copy(blob, (*(*[sizeOfDSAParamsHeader]byte)(unsafe.Pointer(&hdr)))[:]) | ||
| i := int(sizeOfDSAParamsHeader) | ||
| copy(blob[i:], params.P[:]) | ||
| i += len(params.P) | ||
| copy(blob[i:], params.G[:]) | ||
| } else { | ||
| blob = make([]byte, sizeOfDSAParamsV2Header+keySize*2+groupSize+seedSize) | ||
| hdr := bcrypt.DSA_PARAMETER_HEADER_V2{ | ||
| Length: uint32(len(blob)), | ||
| Magic: bcrypt.DSA_PARAMETERS_MAGIC_V2, | ||
| KeySize: keySize, | ||
| GroupSize: groupSize, | ||
| HashAlgorithm: bcrypt.DSA_HASH_ALGORITHM_SHA256, | ||
| StandardVersion: bcrypt.DSA_FIPS186_3, | ||
| SeedLength: seedSize, | ||
| //Count: , | ||
| } | ||
| copy(blob, (*(*[sizeOfDSAParamsV2Header]byte)(unsafe.Pointer(&hdr)))[:]) | ||
| i := int(sizeOfDSAParamsV2Header) | ||
| copy(blob[i:], params.S[:]) | ||
| i += len(params.S) | ||
| copy(blob[i:], params.Q[:]) | ||
| i += len(params.Q) | ||
| copy(blob[i:], params.P[:]) | ||
| i += len(params.P) | ||
| copy(blob[i:], params.G[:]) | ||
|
|
||
| } | ||
| // TODO: This still not works... | ||
| if err := bcrypt.SetProperty(bcrypt.HANDLE(hkey), utf16PtrFromString(bcrypt.DSA_PARAMETERS), blob, 0); err != nil { | ||
| bcrypt.DestroyKey(hkey) | ||
| return nil, err | ||
| } | ||
| if err := bcrypt.FinalizeKeyPair(hkey, 0); err != nil { | ||
| bcrypt.DestroyKey(hkey) | ||
| return nil, err | ||
| } | ||
| k := &DSAPrivateKey{hkey} | ||
| runtime.SetFinalizer(k, (*DSAPrivateKey).finalize) | ||
| return k, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| // Copyright (c) Microsoft Corporation. | ||
| // Licensed under the MIT License. | ||
|
|
||
| //go:build windows | ||
| // +build windows | ||
|
|
||
| package cng_test | ||
|
|
||
| import ( | ||
| "math/big" | ||
| "testing" | ||
|
|
||
| "github.com/microsoft/go-crypto-winnative/cng" | ||
| "github.com/microsoft/go-crypto-winnative/cng/bbig" | ||
| ) | ||
|
|
||
| func TestGenerateDSAParameters(t *testing.T) { | ||
| testParameterGeneration(t, 1024, 160) | ||
| testParameterGeneration(t, 2048, 256) | ||
| testParameterGeneration(t, 3072, 256) | ||
| } | ||
|
|
||
| func testParameterGeneration(t *testing.T, L, N int) { | ||
| params, err := cng.GenerateDSAParameters(L) | ||
| if err != nil { | ||
| t.Errorf("%d: %d-%d", L, N, err) | ||
| return | ||
| } | ||
|
|
||
| P := bbig.Dec(params.P) | ||
| Q := bbig.Dec(params.Q) | ||
| G := bbig.Dec(params.G) | ||
|
|
||
| if P.BitLen() != L { | ||
| t.Errorf("%d-%d: params.BitLen got:%d want:%d", L, N, P.BitLen(), L) | ||
| } | ||
|
|
||
| if Q.BitLen() != N { | ||
| t.Errorf("%d-%d: q.BitLen got:%d want:%d", L, N, Q.BitLen(), L) | ||
| } | ||
|
|
||
| one := new(big.Int) | ||
| one.SetInt64(1) | ||
| pm1 := new(big.Int).Sub(P, one) | ||
| quo, rem := new(big.Int).DivMod(pm1, Q, new(big.Int)) | ||
| if rem.Sign() != 0 { | ||
| t.Errorf("%d-%d: p-1 mod q != 0", L, N) | ||
| } | ||
| x := new(big.Int).Exp(G, quo, P) | ||
| if x.Cmp(one) == 0 { | ||
| t.Errorf("%d-%d: invalid generator", L, N) | ||
| } | ||
|
|
||
| _, err = cng.GenerateKey(params) | ||
| if err != nil { | ||
| t.Errorf("error generating key: %s", err) | ||
| return | ||
| } | ||
| } |
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