1 files changed, 115 insertions, 0 deletions
diff --git a/vendor/git.zero-knowledge.org/gibheer/pki/rsa.go b/vendor/git.zero-knowledge.org/gibheer/pki/rsa.go
new file mode 100644
index 0000000..b4024ac
--- /dev/null
+++ b/vendor/git.zero-knowledge.org/gibheer/pki/rsa.go
@@ -0,0 +1,115 @@
+package pki
+
+import (
+	"crypto"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/x509"
+	"encoding/pem"
+	"errors"
+	"io"
+)
+
+const (
+	PemLabelRsa = "RSA PRIVATE KEY"
+)
+
+type (
+	RsaPrivateKey struct {
+		private_key *rsa.PrivateKey
+	}
+
+	RsaPublicKey struct {
+		public_key *rsa.PublicKey
+	}
+)
+
+// generate a new rsa private key
+func NewPrivateKeyRsa(size int) (*RsaPrivateKey, error) {
+	key, err := rsa.GenerateKey(rand.Reader, size)
+	if err != nil {
+		return nil, err
+	}
+	return &RsaPrivateKey{key}, nil
+}
+
+// load a rsa private key its ASN.1 presentation
+func LoadPrivateKeyRsa(raw []byte) (*RsaPrivateKey, error) {
+	key, err := x509.ParsePKCS1PrivateKey(raw)
+	if err != nil {
+		return nil, err
+	}
+	return &RsaPrivateKey{key}, nil
+}
+
+func (pr *RsaPrivateKey) Public() PublicKey {
+	return &RsaPublicKey{pr.private_key.Public().(*rsa.PublicKey)}
+}
+
+func (pr RsaPrivateKey) Sign(message []byte, hash crypto.Hash) ([]byte, error) {
+	if !hash.Available() {
+		return make([]byte, 0), errors.New("Hash method is not available!")
+	}
+	hashed_message := hash.New()
+	hashed_message.Write(message)
+	return rsa.SignPKCS1v15(rand.Reader, pr.private_key, hash, hashed_message.Sum(nil))
+}
+
+// get the private key
+func (pr RsaPrivateKey) PrivateKey() crypto.PrivateKey {
+	return pr.private_key
+}
+
+func (pr RsaPrivateKey) MarshalPem() (io.WriterTo, error) {
+	pem_block, err := pr.ToPem()
+	if err != nil { // it does not currently return an error, but maybe that will change
+		return nil, err
+	}
+	return marshalledPemBlock(pem.EncodeToMemory(&pem_block)), nil
+}
+
+func (pr RsaPrivateKey) ToPem() (pem.Block, error) {
+	return pem.Block{
+		Type:  PemLabelRsa,
+		Bytes: x509.MarshalPKCS1PrivateKey(pr.private_key),
+	}, nil
+}
+
+// restore a rsa public key
+func LoadPublicKeyRsa(raw []byte) (*RsaPublicKey, error) {
+	pub := &RsaPublicKey{}
+	if pub_raw, err := x509.ParsePKIXPublicKey(raw); err != nil {
+		return nil, err
+	} else {
+		pub.public_key = pub_raw.(*rsa.PublicKey)
+	}
+	return pub, nil
+}
+
+// ToPem returns the pem encoded public key.
+func (pu *RsaPublicKey) ToPem() (pem.Block, error) {
+	asn1, err := x509.MarshalPKIXPublicKey(pu.public_key)
+	if err != nil {
+		return pem.Block{}, err
+	}
+	return pem.Block{Type: PemLabelPublic, Bytes: asn1}, nil
+}
+
+// marshal a rsa public key into pem format
+func (pu *RsaPublicKey) MarshalPem() (io.WriterTo, error) {
+	pem_block, err := pu.ToPem()
+	if err != nil {
+		return nil, err
+	}
+	return marshalledPemBlock(pem.EncodeToMemory(&pem_block)), nil
+}
+
+// verify a message with a signature using the public key
+func (pu *RsaPublicKey) Verify(message []byte, signature []byte, hash crypto.Hash) (bool, error) {
+	hashed_message := hash.New()
+	hashed_message.Write(message)
+	if err := rsa.VerifyPKCS1v15(pu.public_key, hash, hashed_message.Sum(nil), signature); err != nil {
+		return false, err
+	}
+	return true, nil
+}