[libeufin] branch master updated: Crockford's base32 decoder, EdDSA public key import.

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marcello pushed a commit to branch master
in repository libeufin.

The following commit(s) were added to refs/heads/master by this push:
     new 45d1133  Crockford's base32 decoder, EdDSA public key import.
45d1133 is described below

commit 45d11337f6ae92c592eb4ad96422a5fa9b2a76f2
Author: Marcello Stanisci <address@hidden>
AuthorDate: Sat Mar 28 10:43:19 2020 +0100

    Crockford's base32 decoder, EdDSA public key import.
---
 util/build.gradle                      |  3 ++-
 util/src/main/kotlin/strings.kt        | 24 +++++++++++++++++++++++-
 util/src/test/kotlin/CryptoUtilTest.kt | 29 ++++++++++++++++++++++++-----
 3 files changed, 49 insertions(+), 7 deletions(-)

diff --git a/util/build.gradle b/util/build.gradle
index 6205339..394342b 100644
--- a/util/build.gradle
+++ b/util/build.gradle
@@ -38,9 +38,10 @@ dependencies {
     implementation "javax.activation:activation:1.1"
     implementation "org.glassfish.jaxb:jaxb-runtime:2.3.1"
     implementation 'org.apache.santuario:xmlsec:2.1.4'
-    implementation group: 'org.bouncycastle', name: 'bcprov-jdk16', version: 
'1.45'
+    implementation group: 'org.bouncycastle', name: 'bcprov-jdk15on', version: 
'1.64'
     implementation group: 'org.xerial', name: 'sqlite-jdbc', version: '3.28.0'
     implementation group: 'org.apache.commons', name: 'commons-compress', 
version: '1.20'
+    implementation("com.msiops.ground:ground-crockford32:0.1")
 
     testImplementation group: 'junit', name: 'junit', version: '4.12'
     testImplementation 'org.jetbrains.kotlin:kotlin-test-junit:1.3.50'
diff --git a/util/src/main/kotlin/strings.kt b/util/src/main/kotlin/strings.kt
index d8d5b8d..0092e63 100644
--- a/util/src/main/kotlin/strings.kt
+++ b/util/src/main/kotlin/strings.kt
@@ -1,6 +1,8 @@
 package tech.libeufin.util
+import org.apache.commons.codec.binary.Base32
 import java.math.BigInteger
 import java.util.*
+import com.msiops.ground.crockford32.Crockford32
 
 
 fun ByteArray.toHexString() : String {
@@ -41,9 +43,29 @@ fun base64ToBytes(encoding: String): ByteArray {
     return Base64.getDecoder().decode(encoding)
 }
 
+/**
+ * Crockford's base32 decoding.
+ */
+fun base32ToBytes(encoding: String): ByteArray {
+    val i: BigInteger = Crockford32.decode(encoding)
+    if ((i.bitLength() % 4) != 0) {
+        logger.debug("No extra 4-bits element added (bitLength: 
${i.bitLength()})")
+        return i.toByteArray()
+    }
+    val extraByteBlob = i.toByteArray()
+    return Arrays.copyOfRange(extraByteBlob, 1, extraByteBlob.size)
+}
+
+/**
+ * Crockford's base32 encoding.
+ */
+fun bytesToBase32(bytes: ByteArray): String {
+    return Crockford32.encode(BigInteger(bytes))
+}
+
 fun BigInteger.toUnsignedHexString(): String {
     val signedValue = this.toByteArray()
-    require(this.signum() > 0) { "number must be positive"}
+    require(this.signum() > 0) { "number must be positive" }
     val start = if (signedValue[0] == 0.toByte()) { 1 } else { 0 }
     val bytes = Arrays.copyOfRange(signedValue, start, signedValue.size)
     return bytes.toHexString()
diff --git a/util/src/test/kotlin/CryptoUtilTest.kt 
b/util/src/test/kotlin/CryptoUtilTest.kt
index a64a942..e3d27ed 100644
--- a/util/src/test/kotlin/CryptoUtilTest.kt
+++ b/util/src/test/kotlin/CryptoUtilTest.kt
@@ -17,18 +17,21 @@
  * <http://www.gnu.org/licenses/>
  */
 
+import org.bouncycastle.asn1.edec.EdECObjectIdentifiers
+import org.bouncycastle.asn1.x509.AlgorithmIdentifier
+import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo
 import org.junit.Test
-import tech.libeufin.util.CryptoUtil
-import tech.libeufin.util.decodeHexString
-import tech.libeufin.util.toHexString
-import tech.libeufin.util.toUnsignedHexString
+import tech.libeufin.util.*
 import java.math.BigInteger
+import java.security.KeyFactory
 import java.security.KeyPairGenerator
+import java.security.Security
 import java.security.interfaces.RSAPrivateCrtKey
+import java.security.spec.KeySpec
+import java.security.spec.X509EncodedKeySpec
 import javax.crypto.EncryptedPrivateKeyInfo
 import kotlin.test.assertEquals
 import kotlin.test.assertTrue
-
 class CryptoUtilTest {
 
     @Test
@@ -140,4 +143,20 @@ class CryptoUtilTest {
 
         assertEquals(expectedHash.toString(Charsets.UTF_8), 
pubHash.toHexString())
     }
+
+    @Test
+    fun importEdDSAPublicKeyTest() {
+        val givenEnc = "XZH3P6NF9DSG3BH0C082X38N2RVK1RV2H24KF76028QBKDM24BCG"
+        // import a public key
+        val spki = SubjectPublicKeyInfo(AlgorithmIdentifier(
+            EdECObjectIdentifiers.id_Ed25519),
+            base32ToBytes(givenEnc)
+        )
+        val ks: KeySpec = X509EncodedKeySpec(spki.encoded)
+        val kpg = KeyFactory.getInstance(
+            "EdDSA",
+            org.bouncycastle.jce.provider.BouncyCastleProvider()
+        )
+        kpg.generatePublic(ks)
+    }
 }
\ No newline at end of file

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