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Base58Check encoding: Difference between revisions
→{{header|Nim}}
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Line 644:
0x10c8511e -> Rt5zm
</pre>
=={{header|Nim}}==
{{libheader|bignum}}
<lang Nim>import sequtils, strutils
import bignum
const CodeString = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"
proc toBase58*(hashValue: string): string =
## Convert a hash value provided as a string to its base 58 representation.
# Build a big integer from the string.
var hexval = ""
var val: Int
if hashValue.startsWith("0x"):
hexval = hashValue[2..^1]
val = newInt(hexval, 16)
else:
val = newInt(hashValue, 10)
# Convert to base 58.
while val > 0:
result.add CodeString[(val mod 58).toInt]
val = val div 58
# Add codes for leading zeroes.
for c in hexval:
if c == '0': result.add '1'
else: break
# Reverse string.
let h = result.high
for i in 0..(h div 2):
swap result[i], result[h - i]
proc toBase58*(hashValue: openArray[byte]): string =
## Convert an array or sequence of bytes to base 58.
toBase58("0x" & hashValue.join().toHex)
when isMainModule:
const Hashes = ["0x00010966776006953D5567439E5E39F86A0D273BEED61967F6",
"0x61",
"0x626262",
"0x636363",
"0x73696d706c792061206c6f6e6720737472696e67",
"0x516b6fcd0f",
"0xbf4f89001e670274dd",
"0x572e4794",
"0xecac89cad93923c02321",
"0x10c8511e"]
const MaxLength = max(Hashes.mapIt(it.len))
for h in Hashes:
echo h.alignLeft(MaxLength), " → ", h.toBase58</lang>
{{out}}
<pre>0x00010966776006953D5567439E5E39F86A0D273BEED61967F6 → 1116UwLL9Risc3QfPqBUvKofHmBQ7wMtjvM
0x61 → 2g
0x626262 → a3gV
0x636363 → aPEr
0x73696d706c792061206c6f6e6720737472696e67 → 2cFupjhnEsSn59qHXstmK2ffpLv2
0x516b6fcd0f → ABnLTmg
0xbf4f89001e670274dd → 3SEo3LWLoPntC
0x572e4794 → 3EFU7m
0xecac89cad93923c02321 → EJDM8drfXA6uyA
0x10c8511e → Rt5zm</pre>
=={{header|Perl}}==
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