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When I m trying to convert the value1 to byte[] using the following code:
string value1 = "4rdHFh%2BHYoS8oLdVvbUzEVqB8Lvm7kSPnuwF0AAABYQ%3D";
byte[] value2 = Convert.FromBase64String(value1);
Ι received an error that the string contents invalid base-64 characters...
What's wrong?
Thanks!
943
The base 64 digits in ascending order from zero are the uppercase characters 'A' to 'Z', lowercase characters 'a' to 'z', numerals '0' to '9', and the symbols '+' and '/'. % is not allowed in base64 encoding. Save this answer.
This error happens when the string that you are trying to transform contains a character not recognized by the basic Base 64 Alphabet (in this case it was an underscore character). Below you can see which characters are accepted. ietf.org - RFC 4648.
BASE64 characters are 6 bits in length. They are formed by taking a block of three octets to form a 24-bit string, which is converted into four BASE64 characters.
Base64 encoding uses some characters which must be encoded if they're part of a querystring (namely + and / , and maybe = too). If the string isn't correctly encoded then you won't be able to decode it successfully at the other end, hence the errors.
From Convert.FromBase64String
s is composed of base 64 digits, white space characters, and trailing padding characters. The base 64 digits in ascending order from zero are the uppercase characters 'A' to 'Z', lowercase characters 'a' to 'z', numerals '0' to '9', and the symbols '+' and '/'.
% is not allowed in base64 encoding.
Check out The Base64 index table from Wikipedia
Value Char
0 A 16 Q 32 g 48 w
1 B 17 R 33 h 49 x
2 C 18 S 34 i 50 y
3 D 19 T 35 j 51 z
4 E 20 U 36 k 52 0
5 F 21 V 37 l 53 1
6 G 22 W 38 m 54 2
7 H 23 X 39 n 55 3
8 I 24 Y 40 o 56 4
9 J 25 Z 41 p 57 5
10 K 26 a 42 q 58 6
11 L 27 b 43 r 59 7
12 M 28 c 44 s 60 8
13 N 29 d 45 t 61 9
14 O 30 e 46 u 62 +
15 P 31 f 47 v 63 /
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