crypto.hmac-sha256
HMAC-SHA256 of a message under a secret key (RFC 2104, RFC 4231), in pure code that also runs in the browser.
hmac_sha256 in PythonResults for “crypto”
22 capabilities
crypto.sha256
The SHA-256 digest of a byte string (FIPS 180-4), in pure code that also runs in the browser.
sha256 in Python
crypto.constant-time-equal
Compare two byte strings in time that does not depend on where they differ, for checking MACs and hashes.
constant_time_equal in Python
crypto.pbkdf2-sha256
PBKDF2 with HMAC-SHA256 (RFC 8018): derive a key from a password and salt, slowly, fast enough for a login request.
pbkdf2_sha256 in Python
encoding.utf8
Text to UTF-8 bytes and strictly back (RFC 3629), so hashing and signing see the same bytes in every language.
A group of 2:
utf8_encode, utf8_decode
auth.password-hash
Hash a password for storage as pbkdf2_sha256$iterations$salt$hash, verify one in constant time, and spot weak hashes.
A group of 3:
hash_password, verify_password, password_needs_rehash
encoding.hex
Bytes to lowercase hexadecimal text and back (RFC 4648 base16), strictly, identically in every language.
A group of 2:
hex_encode, hex_decode
math.pow
base to the power exponent from + - * / only, exact by squaring for whole exponents, identical in every language.
pow in Python
math.exp
e to the power x from + - * / only, so TypeScript, Python and Rust return the same double for the same input.
exp in Python
money.compare
Compare two amounts of one currency, refusing to compare across currencies; min, max and clamp too.
A group of 4:
compare_money, min_money, max_money, clamp_money
money.add
Add, subtract and negate monetary amounts, refusing to mix currencies.
add_money in Python
money.convert
Convert an amount to another currency at a supplied exact rate, with an explicit rounding mode.
convert_money in Python
energy.climate-change-levy
Climate Change Levy on a business supply of electricity, gas, LPG or solid fuel, at the main rate in force on the date.
climate_change_levy in Python
math.big-integer
Exact integer arithmetic of any size, on decimal strings, for powers and products that overflow 64 bits.
calculate_big_integer in Python
math.clamp
Clamp an integer to an inclusive range, refusing a range whose bounds are the wrong way round.
clamp in Python
construction.cis-deduction
Construction Industry Scheme deduction (0, 20 or 30%) on the labour part of a subcontractor payment.
cis_deduction in Python
money.currency-digits
How many decimal places a currency's minor unit has, from the ISO 4217 list.
currency_digits in Python
math.fractional-power
Raise a positive decimal to a fractional power, (1.199)^(31/365), identically in every language.
fractional_power in Python
validation.lei
Check a 20-character Legal Entity Identifier against its ISO 17442 / ISO 7064 MOD 97-10 check digits.
validate_lei in Python
math.round-div
Integer division with an explicit rounding mode, for money arithmetic that must not drift.
round_div in Python
inventory.valuation-fifo
FIFO stock valuation and cost of sales from a stock movement ledger, in exact money.
fifo_valuation in Python