[libeufin] 02/02: crypto utils

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dold pushed a commit to branch master
in repository libeufin.

commit 43fa22d6322e903a431502945ae16676a1a59d5b
Author: Florian Dold <address@hidden>
AuthorDate: Wed Oct 30 12:36:24 2019 +0100

    crypto utils
---
 sandbox/src/main/kotlin/CryptoUtil.kt | 75 +++++++++++++++++++++++++++++++++++
 sandbox/src/test/kotlin/RsaTest.kt    | 31 ---------------
 2 files changed, 75 insertions(+), 31 deletions(-)

diff --git a/sandbox/src/main/kotlin/CryptoUtil.kt 
b/sandbox/src/main/kotlin/CryptoUtil.kt
new file mode 100644
index 0000000..fb72d09
--- /dev/null
+++ b/sandbox/src/main/kotlin/CryptoUtil.kt
@@ -0,0 +1,75 @@
+/*
+ * This file is part of LibEuFin.
+ * Copyright (C) 2019 Stanisci and Dold.
+
+ * LibEuFin is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation; either version 3, or
+ * (at your option) any later version.
+
+ * LibEuFin is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General
+ * Public License for more details.
+
+ * You should have received a copy of the GNU Affero General Public
+ * License along with LibEuFin; see the file COPYING.  If not, see
+ * <http://www.gnu.org/licenses/>
+ */
+
+package tech.libeufin.sandbox
+
+import java.lang.Exception
+import java.security.KeyFactory
+import java.security.KeyPairGenerator
+import java.security.interfaces.RSAPrivateCrtKey
+import java.security.interfaces.RSAPublicKey
+import java.security.spec.PKCS8EncodedKeySpec
+import java.security.spec.RSAPublicKeySpec
+import java.security.spec.X509EncodedKeySpec
+
+/**
+ * RSA key pair.
+ */
+data class RsaCrtKeyPair(val private: RSAPrivateCrtKey, val public: 
RSAPublicKey)
+
+/**
+ * Helpers for dealing with crypographic operations in EBICS / LibEuFin.
+ */
+class CryptoUtil {
+    companion object {
+        fun loadRsaPrivateKey(encodedPrivateKey: ByteArray): RSAPrivateCrtKey {
+            val spec = PKCS8EncodedKeySpec(encodedPrivateKey)
+            val priv = KeyFactory.getInstance("RSA").generatePrivate(spec)
+            if (priv !is RSAPrivateCrtKey)
+                throw Exception("wrong encoding")
+            return priv
+        }
+        fun loadRsaPublicKey(encodedPublicKey: ByteArray): RSAPublicKey {
+            val spec = X509EncodedKeySpec(encodedPublicKey)
+            val pub = KeyFactory.getInstance("RSA").generatePublic(spec)
+            if (pub !is RSAPublicKey)
+                throw Exception("wrong encoding")
+            return pub
+        }
+        fun getRsaPublicFromPrivate(rsaPrivateCrtKey: RSAPrivateCrtKey): 
RSAPublicKey {
+            val spec = RSAPublicKeySpec(rsaPrivateCrtKey.modulus, 
rsaPrivateCrtKey.publicExponent)
+            val pub = KeyFactory.getInstance("RSA").generatePublic(spec)
+            if (pub !is RSAPublicKey)
+                throw Exception("wrong encoding")
+            return pub
+        }
+        fun generateRsaKeyPair(nbits: Int): RsaCrtKeyPair {
+            val gen = KeyPairGenerator.getInstance("RSA")
+            gen.initialize(nbits)
+            val pair = gen.genKeyPair()
+            val priv = pair.private
+            val pub = pair.public
+            if (priv !is RSAPrivateCrtKey)
+                throw Exception("key generation failed")
+            if (pub !is RSAPublicKey)
+                throw Exception("key generation failed")
+            return RsaCrtKeyPair(priv, pub)
+        }
+    }
+}
\ No newline at end of file
diff --git a/sandbox/src/test/kotlin/RsaTest.kt 
b/sandbox/src/test/kotlin/RsaTest.kt
deleted file mode 100644
index 836d88d..0000000
--- a/sandbox/src/test/kotlin/RsaTest.kt
+++ /dev/null
@@ -1,31 +0,0 @@
-package tech.libeufin.sandbox
-
-import org.junit.Test
-import java.math.BigInteger
-import java.util.*
-
-class RsaTest {
-
-    val publicModulus = BigInteger("65537")
-    val publicExponent = BigInteger(512, Random())
-
-    @Test
-    fun loadFromModulusAndExponent() {
-        val key = loadRsaPublicKey(publicExponent.toByteArray(), 
publicModulus.toByteArray())
-        println(key.toString())
-    }
-
-    /**
-     * Values generating helper.
-     */
-    @Test
-    fun getBase64Values() {
-
-        println(
-            "Modulus: 
${Base64.getEncoder().encodeToString(publicModulus.toByteArray())}"
-        )
-        println(
-            "Exponent: 
${Base64.getEncoder().encodeToString(publicExponent.toByteArray())}"
-        )
-    }
-}
\ No newline at end of file

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