src/main/java/org/apache/jcp/xml/dsig/internal/dom/DOMKeyValue.java [453:470]:
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        private static ECPoint decodePoint(byte[] data, EllipticCurve curve)
                throws IOException {
            if (data.length == 0 || data[0] != 4) {
                throw new IOException("Only uncompressed point format " +
                                      "supported");
            }
            // Per ANSI X9.62, an encoded point is a 1 byte type followed by
            // ceiling(LOG base 2 field-size / 8) bytes of x and the same of y.
            int n = (data.length - 1) / 2;
            if (n != (curve.getField().getFieldSize() + 7) >> 3) {
                throw new IOException("Point does not match field size");
            }

            byte[] xb = Arrays.copyOfRange(data, 1, 1 + n);
            byte[] yb = Arrays.copyOfRange(data, n + 1, n + 1 + n);

            return new ECPoint(new BigInteger(1, xb), new BigInteger(1, yb));
        }
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src/main/java/org/apache/xml/security/keys/content/keyvalues/ECKeyValue.java [323:340]:
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    private static ECPoint decodePoint(byte[] data, EllipticCurve curve)
        throws IOException {
        if (data.length == 0 || data[0] != 4) {
            throw new IOException("Only uncompressed point format " +
                "supported");
        }
        // Per ANSI X9.62, an encoded point is a 1 byte type followed by
        // ceiling(LOG base 2 field-size / 8) bytes of x and the same of y.
        int n = (data.length - 1) / 2;
        if (n != (curve.getField().getFieldSize() + 7) >> 3) {
            throw new IOException("Point does not match field size");
        }

        byte[] xb = Arrays.copyOfRange(data, 1, 1 + n);
        byte[] yb = Arrays.copyOfRange(data, n + 1, n + 1 + n);

        return new ECPoint(new BigInteger(1, xb), new BigInteger(1, yb));
    }
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