https://www.oauth.com/oauth2-servers/client-registration/client-id-secret/.

package rand_ Creating Random Strings in Go.

In ANSI X9.23, between 1 and 8 bytes are always added as padding.

ISO 10126 (withdrawn, 2007[7][8]) specifies that the padding should be done at the end of that last block with random bytes, and the padding boundary should be specified by the last byte.

the data string D to be input to the MAC algorithm shall be right-padded with as few (possible none) '0' bits as necessary to obtain a data string whose length(in bits) is a positive integer multiple of n.

the data string D to be input to the MAC algorithm shall be right-padded with a single '1' bit.

the data string D to be input to the MAC algorithm shall be right-padded with as few (possible none) '0' bits as necessary to obtain a data string whose length(in bits) is a positive integer multiple of n.

PKCS#5 padding is identical to PKCS#7 padding, except that it has only been defined for block ciphers that use a 64-bit (8-byte) block size.

Padding is in whole bytes.

ISO/IEC 7816-4:2005[9] is identical to the bit padding scheme, applied to a plain text of N bytes.

See https://en.wikipedia.org/wiki/Data_source_name.