sha1.Sum() gives different output when called more than one time #216
Description
by patla073:
Hello, I've been using the sha1-package and I have encountered a strange
behaviour when calling sha1.Sum() on the same object more than one time.
I do not have much experience with sha1, but this behaviour is inconsistent
with the hashlib from Python. I have put together two small programs to
reproduce the output from go and the corresponding output from python.
Best Regards.
Patrik
Go program:
package main
import "fmt"
import "strings"
import "crypto/sha1"
func main() {
teststring := "issue9";
thehash := sha1.New();
thehash.Write(strings.Bytes(teststring));
result := thehash.Sum();
fmt.Printf("%d\n\n", result);
result = thehash.Sum();
fmt.Printf("%d\n\n", result);
}
Corresponding Python program:
from hashlib import sha1
from struct import unpack
teststring = "issue9"
thehash = sha1(teststring)
result = thehash.digest()
print unpack('%sB' % len(result), result)
print
result = thehash.digest()
print unpack('%sB' % len(result), result)
Go output:
%d([]uint8=[130 101 105 116 191 0 110 128 79 240 20 225 81 250 173 57 214 4
177 25])
%d([]uint8=[6 217 191 209 66 212 123 60 34 155 125 43 70 214 99 211 197 240
134 1])
Python output:
(130, 101, 105, 116, 191, 0, 110, 128, 79, 240, 20, 225, 81, 250, 173, 57,
214, 4, 177, 25)
(130, 101, 105, 116, 191, 0, 110, 128, 79, 240, 20, 225, 81, 250, 173, 57,
214, 4, 177, 25)