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Export the public key as a BigInteger #27

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Merged
sethmoo merged 1 commit into from
Jul 7, 2025
Merged

Export the public key as a BigInteger #27

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10 changes: 10 additions & 0 deletions src/com/google/cose/OkpKey.java
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@
import com.google.cose.exceptions.CoseException;
import com.google.cose.utils.CborUtils;
import com.google.cose.utils.Headers;
import java.math.BigInteger;
import java.util.Arrays;

/**
Expand Down Expand Up @@ -41,6 +42,15 @@ public byte[] getPublicKeyBytes() {
return Arrays.copyOf(publicKeyBytes, publicKeyBytes.length);
}

public BigInteger getPublicKeyBytesAsBigInteger() {
// Reverse the bytes to get the correct big-endian representation.
byte[] reversedBytes = new byte[publicKeyBytes.length];
for (int i = 0; i < publicKeyBytes.length; i++) {
reversedBytes[i] = publicKeyBytes[publicKeyBytes.length - 1 - i];
}
return new BigInteger(1, reversedBytes);
}

/** Recursive builder to build out the Ec2 key and its subclasses. */
abstract static class Builder<T extends Builder<T>> extends CoseKey.Builder<T> {
private Integer curve = null;
Expand Down