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Results tagged with cryptography
Search options questions only
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user 11321
Questions relating to cryptographic topics such as encryption/decryption and hashing. (Not for use with trivial ciphers.)
4
votes
1
answer
2k
views
ChaCha20 Implementation (based on RFC7539)
Rolling my own cryptography in order to better understand the subject and came up with implementation of the ChaCha20 algorithm pasted below. …
- 1,940
2
votes
0
answers
418
views
T-SQL Totp (Rfc6238 SHA2_256) Implementation
Using my previous function as a base I've come up the following:
create function dbo.Totp (
@key varbinary(8000)
, @timeStep int = 90
)
returns table
with schemabinding as
return (
select [ …
- 1,940
2
votes
1
answer
224
views
T-SQL Constant Time Comparison
Cryptography.
Why? Given the strings 0x1234 and 0x1213 a simple equality comparison will stop processing after
it hits the first mismatch at byte position 3. …
- 1,940
6
votes
1
answer
315
views
T-SQL Pbdfk2 (Rfc2898 SHA2_256) Implementation
Using my previous function as a base I've come up the following:
create function dbo.Pbkdf2 (
@password varbinary(8000)
, @salt varbinary(7996)
, @iterations int = 1000
, @derivedKeyLength …
- 1,940
4
votes
1
answer
110
views
T-SQL Secure String Comparison
Cryptography, Gaming.
Why? Given the strings 0x1234 and 0x1213: a simple equality comparison will stop processing after
it hits the first mismatch at byte position 3. …
- 1,940
7
votes
1
answer
1k
views
T-SQL Hmac (Rfc2104 SHA2_256) Implementation
I'm trying to implement an Hmac in T-SQL using this question as an guide. Please critique this:
create function dbo.Hmac (
@key varbinary(8000)
, @message varbinary(7936)
)
returns table
wit …
- 1,940