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Pubkeys are 65 bytes, not 32.

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Mike Hearn
2012-01-26 18:40:24 +01:00
parent ad329d7a34
commit 1a4acc18be
2 changed files with 13 additions and 8 deletions
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7
src/com/google/bitcoin/core/ECKey.java
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@@ -129,7 +129,10 @@ public class ECKey implements Serializable {
// Derive public from private. // Derive public from private.
this.pub = publicKeyFromPrivate(privKey); this.pub = publicKeyFromPrivate(privKey);
} else if (pubKey != null) { } else if (pubKey != null) {
this.pub = Utils.bigIntegerTo32Bytes(pubKey); // We expect the pubkey to be in regular encoded form, just as a BigInteger. Therefore the first byte is
// a special marker byte.
// TODO: This is probably not a useful API and may be confusing.
this.pub = Utils.bigIntegerToBytes(pubKey, 65);
} }
} }
@@ -278,7 +281,7 @@ public class ECKey implements Serializable {
* Returns a 32 byte array containing the private key. * Returns a 32 byte array containing the private key.
*/ */
public byte[] getPrivKeyBytes() { public byte[] getPrivKeyBytes() {
return Utils.bigIntegerTo32Bytes(priv); return Utils.bigIntegerToBytes(priv, 32);
} }
public static ECKey fromPrivKeyBytes(byte[] bytes) { public static ECKey fromPrivKeyBytes(byte[] bytes) {

14
src/com/google/bitcoin/core/Utils.java
View File

@@ -64,15 +64,17 @@ public class Utils {
/** /**
* The regular {@link java.math.BigInteger#toByteArray()} method isn't quite what we often need: it appends a * The regular {@link java.math.BigInteger#toByteArray()} method isn't quite what we often need: it appends a
* leading zero to indicate that the number is positive and may need padding. * leading zero to indicate that the number is positive and may need padding.
* @param b *
* @param b the integer to format into a byte array
* @param numBytes the desired size of the resulting byte array
* @return 32 byte long array. * @return 32 byte long array.
*/ */
public static byte[] bigIntegerTo32Bytes(BigInteger b) { public static byte[] bigIntegerToBytes(BigInteger b, int numBytes) {
byte[] bytes = new byte[32]; byte[] bytes = new byte[numBytes];
byte[] biBytes = b.toByteArray(); byte[] biBytes = b.toByteArray();
int start = (biBytes.length == 33) ? 1 : 0; int start = (biBytes.length == numBytes + 1) ? 1 : 0;
int length = Math.min(biBytes.length, 32); int length = Math.min(biBytes.length, numBytes);
System.arraycopy(biBytes, start, bytes, 32 - length, length); System.arraycopy(biBytes, start, bytes, numBytes - length, length);
return bytes; return bytes;
} }