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A positive integer that expresses the number of bytes in a byte string.
NIST SP 800-56B Rev. 2
The number of consecutive (non-overlapping) bytes in a byte string. For example, 0110010101000011 = 01100101 || 01000011 is two bytes long. The byte length of the empty string is zero.
NIST SP 800-56C Rev. 2