PrintableString

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Template:Short description A PrintableString is a restricted character string type in the ASN.1 notation. It is used to describe data that consists only of a specific printable subset of the ASCII character set.

According to the ASN.1 Specification of basic notation,[1] the character set of PrintableString can be expressed as:

Name Graphic ASCII Code (DEC) ASCII Code (HEX) Type
Latin capital letters A,B, ... Z 65 - 90 41 - 5A Letter
Latin small letters a,b, ... z 97 - 122 61 - 7A Letter
Numbers 0,1, ... 9 48 - 57 30 - 39 Number
SPACE (space) 32 20 Whitespace
APOSTROPHE ' 39 27 Punctuation
LEFT PARENTHESIS ( 40 28 Punctuation
RIGHT PARENTHESIS ) 41 29 Punctuation
PLUS SIGN + 43 2B Punctuation
COMMA , 44 2C Punctuation
HYPHEN-MINUS - 45 2D Punctuation
FULL STOP . 46 2E Punctuation
SOLIDUS / 47 2F Punctuation
COLON : 58 3A Punctuation
EQUALS SIGN = 61 3D Punctuation
QUESTION MARK ? 63 3F Punctuation

The entire character set contains precisely 74 characters. Namely: 52 letters, 10 digits, 1 whitespace and 11 punctuation character. All of these characters, including space, meet the C character classification of "printable character".

Practical limitations

The PrintableString definition does not include the at sign (@) or ampersand (&). Both of these are legal characters in email addresses.

This sometimes causes problems for naive implementers who attempt to put an SMTP email address into an X.509 digital certificate Distinguished Name.

The PrintableString definition does not include asterisk (*) which means it must not be used to represent a wildcard in an X.509 digital certificate Distinguished Name.

Character set

The following table shows the PrintableString character set. Each character is shown with the code point of its Unicode equivalent.

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  Undefined, showing instead the ASCII character at that location)

See also

References

  1. ^ Information technology – Abstract Syntax Notation One (ASN.1): Specification of basic notation, ITU-T X.680, 07/2002
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