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vendor/github.com/aws/aws-sdk-go/service/cloudfront/sign/privkey.go

@@ -0,0 +1,68 @@
+package sign
+
+import (
+	"crypto/rsa"
+	"crypto/x509"
+	"encoding/pem"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+)
+
+// LoadPEMPrivKeyFile reads a PEM encoded RSA private key from the file name.
+// A new RSA private key will be returned if no error.
+func LoadPEMPrivKeyFile(name string) (*rsa.PrivateKey, error) {
+	file, err := os.Open(name)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	return LoadPEMPrivKey(file)
+}
+
+// LoadPEMPrivKey reads a PEM encoded RSA private key from the io.Reader.
+// A new RSA private key will be returned if no error.
+func LoadPEMPrivKey(reader io.Reader) (*rsa.PrivateKey, error) {
+	block, err := loadPem(reader)
+	if err != nil {
+		return nil, err
+	}
+
+	return x509.ParsePKCS1PrivateKey(block.Bytes)
+}
+
+// LoadEncryptedPEMPrivKey decrypts the PEM encoded private key using the
+// password provided returning a RSA private key. If the PEM data is invalid,
+// or unable to decrypt an error will be returned.
+func LoadEncryptedPEMPrivKey(reader io.Reader, password []byte) (*rsa.PrivateKey, error) {
+	block, err := loadPem(reader)
+	if err != nil {
+		return nil, err
+	}
+
+	decryptedBlock, err := x509.DecryptPEMBlock(block, password)
+	if err != nil {
+		return nil, err
+	}
+
+	return x509.ParsePKCS1PrivateKey(decryptedBlock)
+}
+
+func loadPem(reader io.Reader) (*pem.Block, error) {
+	b, err := ioutil.ReadAll(reader)
+	if err != nil {
+		return nil, err
+	}
+
+	block, _ := pem.Decode(b)
+	if block == nil {
+		// pem.Decode will set block to nil if there is no PEM data in the input
+		// the second parameter will contain the provided bytes that failed
+		// to be decoded.
+		return nil, fmt.Errorf("no valid PEM data provided")
+	}
+
+	return block, nil
+}