Seems useful and I did not know about it. Strings in my case can be longer
than 64 bits though but this is a useful building block. Thanks!
Den tisdagen den 11:e mars 2014 kl. 20:13:05 UTC+1 skrev Avik Sengupta:
>
> Does this work?
>
> julia> a="abcdefgh"
> "abcdefgh"
>
> julia> reinterpret(Int64, a.data)
> 1-element Array{Int64,1}:
> 7523094288207667809
>
>
>
> On Tuesday, 11 March 2014 16:07:35 UTC+5:30, Robert Feldt wrote:
>>
>> Implementing simple RSA crypto in pure Julia (not for actual
>> sec-sensitive use) but for low-sec applications. But I have troubles with
>> encoding strings as integers and back. The PKCS#1 crypto standard says that
>> strings should be seen as 8-bit (octet) strings. I tried creating a Uint8[]
>> with the byte values and converting to ASCIIString but that fails when the
>> values are more than 7 bits. However, I cannot just convert to UTF8String
>> instead since those might not be valid either.
>>
>> Ideas for how to do this cleanly? Current code below... Thanks!
>>
>> # Convert a non-negative integer i into an octet string.
>> function i2osp(x::Integer, len = nothing)
>> if typeof(len) <: Integer && (x >= 256^len)
>> throw("integer is too large")
>> end
>>
>> if x < 0
>> throw("integer is negative")
>> end
>>
>> bytes = Uint8[]
>> while x > 0
>> b = uint8(x & 0xff)
>> push!(bytes, b)
>> x = x >>> 8
>> end
>> str = convert(ASCIIString, reverse(bytes)) # Fails if any byte value >
>> 127
>>
>> if typeof(len) <: Integer && (length(str) < len)
>> str = repeat("\0", len - str) * str
>> end
>>
>> return str
>> end
>>
>>
