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signature.go
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signature.go
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package transit
import (
"context"
"crypto/rand"
"encoding/base64"
"github.com/PumpkinSeed/heimdall/internal/errors"
"github.com/PumpkinSeed/heimdall/pkg/structs"
"github.com/hashicorp/vault/sdk/helper/keysutil"
)
func (t *Transit) Sign(ctx context.Context, req *structs.SignParameters, engineName string) (*structs.SignResponse, error) {
p, _, err := t.lm.GetPolicy(ctx, keysutil.PolicyRequest{
Storage: t.u.Storage(engineName),
Name: req.KeyName,
}, rand.Reader)
if err != nil {
return nil, errors.Wrap(err, "transit sign get key error", errors.CodePkgCryptoTransitSignGetKey)
}
if p == nil {
return nil, errors.New("transit sign encryption key not found", errors.CodePkgCryptoTransitSignKeyNotFound)
}
hashType, err := getVaultHashType(req.HashAlgorithm)
if err != nil {
p.Unlock()
return nil, errors.Wrap(err, "transit sign get hash type error", errors.CodePkgCryptoTransitSignKeyHashType)
}
if !p.Type.SigningSupported() {
p.Unlock()
return nil, errors.Newf(errors.CodePkgCryptoTransitSignUnsupported, "transit sign key type %v does not support verification", p.Type)
}
input, err := base64.StdEncoding.DecodeString(req.Input)
if err != nil {
p.Unlock()
return nil, errors.Wrap(err, "transit sign unable to decode input as base64", errors.CodePkgCryptoTransitSignInputFormat)
}
if p.Type.HashSignatureInput() && !req.Prehashed {
hf := keysutil.HashFuncMap[hashType]()
hf.Write(input)
input = hf.Sum(nil)
}
var verificationContext []byte
if req.Context != "" {
verificationContext, err = base64.StdEncoding.DecodeString(req.Context)
if err != nil {
p.Unlock()
return nil, errors.New("transit sign failed to base64-decode context", errors.CodePkgCryptoTransitSignContextFormat)
}
}
sig, err := p.Sign(int(req.KeyVersion), verificationContext, input, hashType, req.SignatureAlgorithm, keysutil.MarshalingTypeASN1)
p.Unlock()
if err != nil {
return nil, errors.Wrap(err, "transit sign error", errors.CodePkgCryptoTransitSign)
}
return &structs.SignResponse{
Result: sig.Signature,
PubKey: string(sig.PublicKey),
}, nil
}
func (t *Transit) VerifySign(ctx context.Context, req *structs.VerificationRequest, engineName string) (*structs.VerificationResponse, error) {
p, _, err := t.lm.GetPolicy(ctx, keysutil.PolicyRequest{
Storage: t.u.Storage(engineName),
Name: req.KeyName,
}, rand.Reader)
if err != nil {
return nil, errors.Wrap(err, "transit verify sign get key error", errors.CodePkgCryptoTransitVerifySignGetKey)
}
if p == nil {
return nil, errors.New("transit verify sign encryption key not found", errors.CodePkgCryptoTransitVerifySignKeyNotFound)
}
hashType, err := getVaultHashType(req.HashAlgorithm)
if err != nil {
return nil, errors.Wrap(err, "transit verify sign get hash type error", errors.CodePkgCryptoTransitVerifySignKeyHashType)
}
if !p.Type.SigningSupported() {
p.Unlock()
return nil, errors.Newf(errors.CodePkgCryptoTransitVerifySignUnsupported, "transit verify sign key type %v does not support verification", p.Type)
}
input, err := base64.StdEncoding.DecodeString(req.Input)
if err != nil {
p.Unlock()
return nil, errors.Wrap(err, "transit verify sign unable to decode input as base64", errors.CodePkgCryptoTransitVerifySignInputFormat)
}
if p.Type.HashSignatureInput() && !req.Prehashed {
hf := keysutil.HashFuncMap[hashType]()
hf.Write(input)
input = hf.Sum(nil)
}
var verificationContext []byte
if req.Context != "" {
verificationContext, err = base64.StdEncoding.DecodeString(req.Context)
if err != nil {
p.Unlock()
return nil, errors.New("transit verify sign failed to base64-decode context", errors.CodePkgCryptoTransitVerifySignContextFormat)
}
}
valid, err := p.VerifySignature(verificationContext, input, hashType, req.SignatureAlgorithm, keysutil.MarshalingTypeASN1, req.Signature)
p.Unlock()
if err != nil {
return nil, errors.Wrap(err, "transit sign error", errors.CodePkgCryptoTransitVerifySign)
}
return &structs.VerificationResponse{
VerificationResult: valid,
}, nil
}
func getVaultHashType(algorithm structs.HashType) (keysutil.HashType, error) {
var ht keysutil.HashType
switch algorithm {
case structs.HashType_HashTypeSHA1:
ht = keysutil.HashTypeSHA1
case structs.HashType_HashTypeSHA2224:
ht = keysutil.HashTypeSHA2224
case structs.HashType_HashTypeSHA2256:
ht = keysutil.HashTypeSHA2256
case structs.HashType_HashTypeSHA2384:
ht = keysutil.HashTypeSHA2384
case structs.HashType_HashTypeSHA2512:
ht = keysutil.HashTypeSHA2512
default:
return ht, errors.New("invalid hash algorithm", errors.CodePkgCryptoTransitGetHashType)
}
return ht, nil
}