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Ch. 45 checksum.py - changes output format to columns; fixes the readme #24

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Ch. 45 checksum.py - changes output format to columns; fixes the readme #24

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48 changes: 36 additions & 12 deletions file-integrity/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -45,11 +45,14 @@ prompt> ./checksum.py -s 1

OPTIONS seed 1
OPTIONS data_size 4
OPTIONS data
OPTIONS data

Decimal: Hex: Bin:
34 0x22 0b00100010
216 0xd8 0b11011000
195 0xc3 0b11000011
65 0x41 0b01000001

Decimal: 34 216 195 65
Hex: 0x22 0xd8 0xc3 0x41
Bin: 0b00100010 0b11011000 0b11000011 0b01000001

Add: ?
Xor: ?
Expand All @@ -61,21 +64,39 @@ prompt>
You can specify a different length for the random data:

```sh
prompt> ./checksum.py -D 2
prompt> ./checksum.py -d 2

OPTIONS seed 0
OPTIONS data_size 2
OPTIONS data

...
Decimal: Hex: Bin:
216 0xd8 0b11011000
194 0xc2 0b11000010


Add: ?
Xor: ?
Fletcher: ?

prompt>
```

You can also specify your own data string:

```sh
prompt> ./checksum.py -D 1,2,3,4

OPTIONS seed 0
OPTIONS data_size 4
OPTIONS data 1,2,3,4

Decimal: 1 2 3 4
Hex: 0x01 0x02 0x03 0x04
Bin: 0b00000001 0b00000010 0b00000011 0b00000100
Decimal: Hex: Bin:
1 0x01 0b00000001
2 0x02 0b00000010
3 0x03 0b00000011
4 0x04 0b00000100


Add: ?
Xor: ?
Expand All @@ -93,9 +114,12 @@ OPTIONS seed 0
OPTIONS data_size 4
OPTIONS data 1,2,3,4

Decimal: 1 2 3 4
Hex: 0x01 0x02 0x03 0x04
Bin: 0b00000001 0b00000010 0b00000011 0b00000100
Decimal: Hex: Bin:
1 0x01 0b00000001
2 0x02 0b00000010
3 0x03 0b00000011
4 0x04 0b00000100


Add: 10 (0b00001010)
Xor: 4 (0b00000100)
Expand Down
27 changes: 13 additions & 14 deletions file-integrity/checksum.py
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Original file line number Diff line number Diff line change
Expand Up @@ -35,21 +35,22 @@ def print_bin(word):

print('')
print('OPTIONS seed', options.seed)
print('OPTIONS data_size', options.data_size)
print('OPTIONS data', options.data)
print('')

random_seed(options.seed)

values = []
if options.data != '':
tmp = options.data.split(',')
for t in tmp:
values.append(int(t))
options.data_size=len(values)
else:
for t in range(int(options.data_size)):
values.append(int(random.random() * 256))

print('OPTIONS data_size', options.data_size)
print('OPTIONS data', options.data)
print('')


add = 0
xor = 0
Expand All @@ -61,20 +62,18 @@ def print_bin(word):
fletcher_a = (fletcher_a + value) % 255
fletcher_b = (fletcher_b + fletcher_a) % 255

print('Decimal: ', end=' ')
for word in values:
print('%10s' % str(word), end=' ')
print('')
# --------------------------------------------

print('Hex: ', end=' ')
print(' Decimal: ', end=' ')
print('Hex: ', end=' ')
print('Bin: ', end='\n')
for word in values:
print(' ', print_hex(word), end=' ')
print('%10s' % str(word), end=' ')
print(' ', print_hex(word), end=' ')
print(' ', print_bin(word), end='\n')
print('')

print('Bin: ', end=' ')
for word in values:
print(print_bin(word), end=' ')
print('')
# --------------------------------------------

print('')
if options.solve:
Expand Down