Constant pem_rfc7468::BASE64_WRAP_WIDTH

pub const BASE64_WRAP_WIDTH: usize = 64;

Width at which the Base64 body of RFC7468-compliant PEM is wrapped.

From RFC7468 § 2:

Generators MUST wrap the base64-encoded lines so that each line consists of exactly 64 characters except for the final line, which will encode the remainder of the data (within the 64-character line boundary), and they MUST NOT emit extraneous whitespace. Parsers MAY handle other line sizes.