def randomart(dgst, header="DIGEST"):
    """Drunken-bishop algorithm for visualizing random art of the digest
    """
    augmentation = " .o+=*BOX@%&#/^SE"
    max_len = len(augmentation) - 1
    field_y = 8 + 1
    field_x = 8 * 2 + 1
    field = [[0 for _ in range(field_y)] for _ in range(field_x)]
    dgst = bytearray(dgst)
    x = field_x // 2
    y = field_y // 2
    for byte in dgst:
        for _ in range(4):
            x += 1 if (byte & 0x1) else -1
            y += 1 if (byte & 0x2) else -1
            x = min(max(x, 0), field_x - 1)
            y = min(max(y, 0), field_y - 1)
            if field[x][y] < max_len - 2:
                field[x][y] += 1
            byte >>= 2
    field[field_x // 2][field_y // 2] = augmentation.index("S")
    field[x][y] = augmentation.index("E")
    result = ["+--[%s]%s+" % (header, "-" * (field_x - 2 - 2 - len(header)))]
    for y in range(field_y):
        result.append("|%s|" % "".join(
            [augmentation[min(field[x][y], max_len)] for x in range(field_x)]
        ))
    result.append("+%s+" % ("-" * field_x))
    return result