[libeufin] branch master updated: fix up key format and key hash

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dold pushed a commit to branch master
in repository libeufin.

The following commit(s) were added to refs/heads/master by this push:
     new 8325a03  fix up key format and key hash
8325a03 is described below

commit 8325a033326725fcf193f0dae9c04e45c5ec5f97
Author: Florian Dold <address@hidden>
AuthorDate: Thu Jan 30 16:43:59 2020 +0100

    fix up key format and key hash
---
 nexus/src/main/kotlin/tech/libeufin/nexus/Main.kt | 12 ++++++------
 util/src/main/kotlin/CryptoUtil.kt                |  4 ++--
 util/src/main/kotlin/strings.kt                   |  9 +++++++++
 3 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/nexus/src/main/kotlin/tech/libeufin/nexus/Main.kt 
b/nexus/src/main/kotlin/tech/libeufin/nexus/Main.kt
index 6bdab04..08649fb 100644
--- a/nexus/src/main/kotlin/tech/libeufin/nexus/Main.kt
+++ b/nexus/src/main/kotlin/tech/libeufin/nexus/Main.kt
@@ -334,12 +334,12 @@ fun main() {
                     )
                     hostID = subscriber.hostID
                     userIdLine = subscriber.userID
-                    esExponentLine = 
signPubTmp.publicExponent.toByteArray().toHexString()
-                    esModulusLine = 
signPubTmp.modulus.toByteArray().toHexString()
-                    encExponentLine = 
encPubTmp.publicExponent.toByteArray().toHexString()
-                    encModulusLine = 
encPubTmp.modulus.toByteArray().toHexString()
-                    authExponentLine = 
authPubTmp.publicExponent.toByteArray().toHexString()
-                    authModulusLine = 
authPubTmp.modulus.toByteArray().toHexString()
+                    esExponentLine = 
signPubTmp.publicExponent.toUnsignedHexString()
+                    esModulusLine = signPubTmp.modulus.toUnsignedHexString()
+                    encExponentLine = 
encPubTmp.publicExponent.toUnsignedHexString()
+                    encModulusLine = encPubTmp.modulus.toUnsignedHexString()
+                    authExponentLine = 
authPubTmp.publicExponent.toUnsignedHexString()
+                    authModulusLine = authPubTmp.modulus.toUnsignedHexString()
                     esKeyHashLine = 
CryptoUtil.getEbicsPublicKeyHash(signPubTmp).toHexString()
                     encKeyHashLine = 
CryptoUtil.getEbicsPublicKeyHash(encPubTmp).toHexString()
                     authKeyHashLine = 
CryptoUtil.getEbicsPublicKeyHash(authPubTmp).toHexString()
diff --git a/util/src/main/kotlin/CryptoUtil.kt 
b/util/src/main/kotlin/CryptoUtil.kt
index bb3e427..e14cf67 100644
--- a/util/src/main/kotlin/CryptoUtil.kt
+++ b/util/src/main/kotlin/CryptoUtil.kt
@@ -121,9 +121,9 @@ object CryptoUtil {
      */
     fun getEbicsPublicKeyHash(publicKey: RSAPublicKey): ByteArray {
         val keyBytes = ByteArrayOutputStream()
-        
keyBytes.writeBytes(publicKey.publicExponent.toByteArray().toHexString().toByteArray())
+        
keyBytes.writeBytes(publicKey.publicExponent.toUnsignedHexString().toByteArray())
         keyBytes.write(' '.toInt())
-        
keyBytes.writeBytes(publicKey.modulus.toByteArray().toHexString().toByteArray())
+        
keyBytes.writeBytes(publicKey.modulus.toUnsignedHexString().toByteArray())
         val digest = MessageDigest.getInstance("SHA-256")
         return digest.digest(keyBytes.toByteArray())
     }
diff --git a/util/src/main/kotlin/strings.kt b/util/src/main/kotlin/strings.kt
index 6fdcfd3..b113e06 100644
--- a/util/src/main/kotlin/strings.kt
+++ b/util/src/main/kotlin/strings.kt
@@ -1,6 +1,8 @@
 package tech.libeufin.util
+import java.math.BigInteger
 import java.util.*
 
+
 fun ByteArray.toHexString() : String {
     return this.joinToString("") {
         java.lang.String.format("%02x", it)
@@ -14,3 +16,10 @@ fun bytesToBase64(bytes: ByteArray): String {
 fun base64ToBytes(encoding: String): ByteArray {
     return Base64.getDecoder().decode(encoding)
 }
+
+fun BigInteger.toUnsignedHexString(): String {
+    val signedValue = this.toByteArray()
+    require(signedValue[0] == 0.toByte()) { "value must be a positive 
BigInteger" }
+    val bytes = Arrays.copyOfRange(signedValue, 1, signedValue.size)
+    return bytes.toHexString()
+}
\ No newline at end of file

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