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T8b949e# This HMAC implementation comes directly from the HMAC implementation

T8b949e# included in Python 3.10.4, and is almost completely identical. It has

T8b949e# been modified to be a pure Python implementation, that is not dependent

T8b949e# on the system having OpenSSL binaries installed.

Tff7b72import T7ee787warnings Tff7b72as T7ee787_warnings

Tff7b72import T7ee787hashlib Tff7b72as T7ee787_hashlib

Te6edf3trans_5C Tff7b72= Tffa657bytesTb4b4b4(Tb4b4b4(Te6edf3x Tff7b72^ T79c0ff0x5CTb4b4b4) Tff7b72for Te6edf3x Tff7b72in Tffa657rangeTb4b4b4(T79c0ff256Tb4b4b4)Tb4b4b4)

Te6edf3trans_36 Tff7b72= Tffa657bytesTb4b4b4(Tb4b4b4(Te6edf3x Tff7b72^ T79c0ff0x36Tb4b4b4) Tff7b72for Te6edf3x Tff7b72in Tffa657rangeTb4b4b4(T79c0ff256Tb4b4b4)Tb4b4b4)

T8b949e# The size of the digests returned by HMAC depends on the underlying

T8b949e# hashing module used. Use digest_size from the instance of HMAC instead.

Te6edf3digest_size Tff7b72= Tff7b72None

Tff7b72class T56d364HMACTb4b4b4:

T8b949e"""RFC 2104 HMAC class. Also complies with RFC 4231.

This supports the API for Cryptographic Hash Functions (PEP 247).

"""

Te6edf3blocksize Tff7b72= T79c0ff64 T8b949e# 512-bit HMAC; can be changed in subclasses.

Tff7b72__slots__ Tff7b72= Tb4b4b4(

Ta5d6ff"Ta5d6ff_hmacTa5d6ff"Tb4b4b4, Ta5d6ff"Ta5d6ff_innerTa5d6ff"Tb4b4b4, Ta5d6ff"Ta5d6ff_outerTa5d6ff"Tb4b4b4, Ta5d6ff"Ta5d6ffblock_sizeTa5d6ff"Tb4b4b4, Ta5d6ff"Ta5d6ffdigest_sizeTa5d6ff"

Tb4b4b4)

Tff7b72def Tff7b72__init__Tb4b4b4(Tff7b72selfTb4b4b4, Te6edf3keyTb4b4b4, Te6edf3msgTff7b72=Tff7b72NoneTb4b4b4, Te6edf3digestmodTff7b72=Te6edf3_hashlibTff7b72.Td2a8ffsha256Tb4b4b4)Tb4b4b4:

T8b949e"""Create a new HMAC object.

key: bytes or buffer, key for the keyed hash object.

msg: bytes or buffer, Initial input for the hash or None.

digestmod: A hash name suitable for hashlib.new(). *OR*

A hashlib constructor returning a new hash object. *OR*

A module supporting PEP 247.

Required as of 3.8, despite its position after the optional

msg argument. Passing it as a keyword argument is

recommended, though not required for legacy API reasons.

"""

Tff7b72if Tff7b72not Tffa657isinstanceTb4b4b4(Te6edf3keyTb4b4b4, Tb4b4b4(Tffa657bytesTb4b4b4, Tffa657bytearrayTb4b4b4)Tb4b4b4)Tb4b4b4:

Tff7b72raise Tf85149TypeErrorTb4b4b4(Ta5d6ff"Ta5d6ffkey: expected bytes or bytearray, but got Tffd700%rTa5d6ff" Tff7b72% Tffa657typeTb4b4b4(Te6edf3keyTb4b4b4)Tff7b72.Td2a8ff__name__Tb4b4b4)

Tff7b72if Tff7b72not Te6edf3digestmodTb4b4b4:

Tff7b72raise Tf85149TypeErrorTb4b4b4(Ta5d6ff"Ta5d6ffMissing required parameter Ta5d6ff'Ta5d6ffdigestmodTa5d6ff'Ta5d6ff.Ta5d6ff"Tb4b4b4)

Tff7b72selfTff7b72.Td2a8ff_hmac_initTb4b4b4(Te6edf3keyTb4b4b4, Te6edf3msgTb4b4b4, Te6edf3digestmodTb4b4b4)

Tff7b72def Td2a8ff_hmac_initTb4b4b4(Tff7b72selfTb4b4b4, Te6edf3keyTb4b4b4, Te6edf3msgTb4b4b4, Te6edf3digestmodTb4b4b4)Tb4b4b4:

Tff7b72if Tffa657callableTb4b4b4(Te6edf3digestmodTb4b4b4)Tb4b4b4:

Te6edf3digest_cons Tff7b72= Te6edf3digestmod

Tff7b72elif Tffa657isinstanceTb4b4b4(Te6edf3digestmodTb4b4b4, Tffa657strTb4b4b4)Tb4b4b4:

Te6edf3digest_cons Tff7b72= Tff7b72lambda Te6edf3dTff7b72=Ta5d6ffbTa5d6ff'Ta5d6ff'Tb4b4b4: Te6edf3_hashlibTff7b72.Td2a8ffnewTb4b4b4(Te6edf3digestmodTb4b4b4, Te6edf3dTb4b4b4)

Tff7b72elseTb4b4b4:

Te6edf3digest_cons Tff7b72= Tff7b72lambda Te6edf3dTff7b72=Ta5d6ffbTa5d6ff'Ta5d6ff'Tb4b4b4: Te6edf3digestmodTff7b72.Td2a8ffnewTb4b4b4(Te6edf3dTb4b4b4)

Tff7b72selfTff7b72.Td2a8ff_hmac Tff7b72= Tff7b72None

Tff7b72selfTff7b72.Td2a8ff_outer Tff7b72= Te6edf3digest_consTb4b4b4(Tb4b4b4)

Tff7b72selfTff7b72.Td2a8ff_inner Tff7b72= Te6edf3digest_consTb4b4b4(Tb4b4b4)

Tff7b72selfTff7b72.Td2a8ffdigest_size Tff7b72= Tff7b72selfTff7b72.Td2a8ff_innerTff7b72.Td2a8ffdigest_size

Tff7b72if Tffa657hasattrTb4b4b4(Tff7b72selfTff7b72.Td2a8ff_innerTb4b4b4, Ta5d6ff'Ta5d6ffblock_sizeTa5d6ff'Tb4b4b4)Tb4b4b4:

Te6edf3blocksize Tff7b72= Tff7b72selfTff7b72.Td2a8ff_innerTff7b72.Td2a8ffblock_size

Tff7b72if Te6edf3blocksize Tff7b72< T79c0ff16Tb4b4b4:

Te6edf3_warningsTff7b72.Td2a8ffwarnTb4b4b4(Ta5d6ff'Ta5d6ffblock_size of Tffd700%dTa5d6ff seems too small; using our Ta5d6ff'

Ta5d6ff'Ta5d6ffdefault of Tffd700%dTa5d6ff.Ta5d6ff' Tff7b72% Tb4b4b4(Te6edf3blocksizeTb4b4b4, Tff7b72selfTff7b72.Td2a8ffblocksizeTb4b4b4)Tb4b4b4,

Tf85149RuntimeWarningTb4b4b4, T79c0ff2Tb4b4b4)

Te6edf3blocksize Tff7b72= Tff7b72selfTff7b72.Td2a8ffblocksize

Tff7b72elseTb4b4b4:

Te6edf3_warningsTff7b72.Td2a8ffwarnTb4b4b4(Ta5d6ff'Ta5d6ffNo block_size attribute on given digest object; Ta5d6ff'

Ta5d6ff'Ta5d6ffAssuming Tffd700%dTa5d6ff.Ta5d6ff' Tff7b72% Tb4b4b4(Tff7b72selfTff7b72.Td2a8ffblocksizeTb4b4b4)Tb4b4b4,

Tf85149RuntimeWarningTb4b4b4, T79c0ff2Tb4b4b4)

Te6edf3blocksize Tff7b72= Tff7b72selfTff7b72.Td2a8ffblocksize

Tff7b72if Tffa657lenTb4b4b4(Te6edf3keyTb4b4b4) Tff7b72> Te6edf3blocksizeTb4b4b4:

Te6edf3key Tff7b72= Te6edf3digest_consTb4b4b4(Te6edf3keyTb4b4b4)Tff7b72.Td2a8ffdigestTb4b4b4(Tb4b4b4)

T8b949e# self.blocksize is the default blocksize. self.block_size is

T8b949e# effective block size as well as the public API attribute.

Tff7b72selfTff7b72.Td2a8ffblock_size Tff7b72= Te6edf3blocksize

Te6edf3key Tff7b72= Te6edf3keyTff7b72.Td2a8ffljustTb4b4b4(Te6edf3blocksizeTb4b4b4, Ta5d6ffbTa5d6ff'Tffea00\0Ta5d6ff'Tb4b4b4)

Tff7b72selfTff7b72.Td2a8ff_outerTff7b72.Td2a8ffupdateTb4b4b4(Te6edf3keyTff7b72.Td2a8fftranslateTb4b4b4(Te6edf3trans_5CTb4b4b4)Tb4b4b4)

Tff7b72selfTff7b72.Td2a8ff_innerTff7b72.Td2a8ffupdateTb4b4b4(Te6edf3keyTff7b72.Td2a8fftranslateTb4b4b4(Te6edf3trans_36Tb4b4b4)Tb4b4b4)

Tff7b72if Te6edf3msg Tff7b72is Tff7b72not Tff7b72NoneTb4b4b4:

Tff7b72selfTff7b72.Td2a8ffupdateTb4b4b4(Te6edf3msgTb4b4b4)

Tf0883e@property

Tff7b72def Td2a8ffnameTb4b4b4(Tff7b72selfTb4b4b4)Tb4b4b4:

Tff7b72if Tff7b72selfTff7b72.Td2a8ff_hmacTb4b4b4:

Tff7b72return Tff7b72selfTff7b72.Td2a8ff_hmacTff7b72.Td2a8ffname

Tff7b72elseTb4b4b4:

Tff7b72return Ta5d6fffTa5d6ff"Ta5d6ffhmac-Tffd700{Tff7b72selfTff7b72.Td2a8ff_innerTff7b72.Td2a8ffnameTffd700}Ta5d6ff"

Tff7b72def Td2a8ffupdateTb4b4b4(Tff7b72selfTb4b4b4, Te6edf3msgTb4b4b4)Tb4b4b4:

T8b949e"""Feed data from msg into this hashing object."""

Te6edf3inst Tff7b72= Tff7b72selfTff7b72.Td2a8ff_hmac Tff7b72or Tff7b72selfTff7b72.Td2a8ff_inner

Te6edf3instTff7b72.Td2a8ffupdateTb4b4b4(Te6edf3msgTb4b4b4)

Tff7b72def Td2a8ffcopyTb4b4b4(Tff7b72selfTb4b4b4)Tb4b4b4:

T8b949e"""Return a separate copy of this hashing object.

An update to this copy won't affect the original object.

"""

T8b949e# Call __new__ directly to avoid the expensive __init__.

Te6edf3other Tff7b72= Tff7b72selfTff7b72.Td2a8ff__class__Tff7b72.Td2a8ff__new__Tb4b4b4(Tff7b72selfTff7b72.Td2a8ff__class__Tb4b4b4)

Te6edf3otherTff7b72.Td2a8ffdigest_size Tff7b72= Tff7b72selfTff7b72.Td2a8ffdigest_size

Tff7b72if Tff7b72selfTff7b72.Td2a8ff_hmacTb4b4b4:

Te6edf3otherTff7b72.Td2a8ff_hmac Tff7b72= Tff7b72selfTff7b72.Td2a8ff_hmacTff7b72.Td2a8ffcopyTb4b4b4(Tb4b4b4)

Te6edf3otherTff7b72.Td2a8ff_inner Tff7b72= Te6edf3otherTff7b72.Td2a8ff_outer Tff7b72= Tff7b72None

Tff7b72elseTb4b4b4:

Te6edf3otherTff7b72.Td2a8ff_hmac Tff7b72= Tff7b72None

Te6edf3otherTff7b72.Td2a8ff_inner Tff7b72= Tff7b72selfTff7b72.Td2a8ff_innerTff7b72.Td2a8ffcopyTb4b4b4(Tb4b4b4)

Te6edf3otherTff7b72.Td2a8ff_outer Tff7b72= Tff7b72selfTff7b72.Td2a8ff_outerTff7b72.Td2a8ffcopyTb4b4b4(Tb4b4b4)

Tff7b72return Te6edf3other

Tff7b72def Td2a8ff_currentTb4b4b4(Tff7b72selfTb4b4b4)Tb4b4b4:

T8b949e"""Return a hash object for the current state.

To be used only internally with digest() and hexdigest().

"""

Tff7b72if Tff7b72selfTff7b72.Td2a8ff_hmacTb4b4b4:

Tff7b72return Tff7b72selfTff7b72.Td2a8ff_hmac

Tff7b72elseTb4b4b4:

Te6edf3h Tff7b72= Tff7b72selfTff7b72.Td2a8ff_outerTff7b72.Td2a8ffcopyTb4b4b4(Tb4b4b4)

Te6edf3hTff7b72.Td2a8ffupdateTb4b4b4(Tff7b72selfTff7b72.Td2a8ff_innerTff7b72.Td2a8ffdigestTb4b4b4(Tb4b4b4)Tb4b4b4)

Tff7b72return Te6edf3h

Tff7b72def Td2a8ffdigestTb4b4b4(Tff7b72selfTb4b4b4)Tb4b4b4:

T8b949e"""Return the hash value of this hashing object.

This returns the hmac value as bytes. The object is

not altered in any way by this function; you can continue

updating the object after calling this function.

"""

Te6edf3h Tff7b72= Tff7b72selfTff7b72.Td2a8ff_currentTb4b4b4(Tb4b4b4)

Tff7b72return Te6edf3hTff7b72.Td2a8ffdigestTb4b4b4(Tb4b4b4)

Tff7b72def Td2a8ffhexdigestTb4b4b4(Tff7b72selfTb4b4b4)Tb4b4b4:

T8b949e"""Like digest(), but returns a string of hexadecimal digits instead.

"""

Te6edf3h Tff7b72= Tff7b72selfTff7b72.Td2a8ff_currentTb4b4b4(Tb4b4b4)

Tff7b72return Te6edf3hTff7b72.Td2a8ffhexdigestTb4b4b4(Tb4b4b4)

Tff7b72def Td2a8ffnewTb4b4b4(Te6edf3keyTb4b4b4, Te6edf3msgTff7b72=Tff7b72NoneTb4b4b4, Te6edf3digestmodTff7b72=Te6edf3_hashlibTff7b72.Td2a8ffsha256Tb4b4b4)Tb4b4b4:

T8b949e"""Create a new hashing object and return it.

key: bytes or buffer, The starting key for the hash.

msg: bytes or buffer, Initial input for the hash, or None.

digestmod: A hash name suitable for hashlib.new(). *OR*

A hashlib constructor returning a new hash object. *OR*

A module supporting PEP 247.

Required as of 3.8, despite its position after the optional

msg argument. Passing it as a keyword argument is

recommended, though not required for legacy API reasons.

You can now feed arbitrary bytes into the object using its update()

method, and can ask for the hash value at any time by calling its digest()

or hexdigest() methods.

"""

Tff7b72return Te6edf3HMACTb4b4b4(Te6edf3keyTb4b4b4, Te6edf3msgTb4b4b4, Te6edf3digestmodTb4b4b4)

Tff7b72def Td2a8ffdigestTb4b4b4(Te6edf3keyTb4b4b4, Te6edf3msgTb4b4b4, Te6edf3digestTb4b4b4)Tb4b4b4:

T8b949e"""Fast inline implementation of HMAC.

key: bytes or buffer, The key for the keyed hash object.

msg: bytes or buffer, Input message.

digest: A hash name suitable for hashlib.new() for best performance. *OR*

A hashlib constructor returning a new hash object. *OR*

A module supporting PEP 247.

"""

Tff7b72if Tffa657callableTb4b4b4(Te6edf3digestTb4b4b4)Tb4b4b4:

Te6edf3digest_cons Tff7b72= Te6edf3digest

Tff7b72elif Tffa657isinstanceTb4b4b4(Te6edf3digestTb4b4b4, Tffa657strTb4b4b4)Tb4b4b4:

Te6edf3digest_cons Tff7b72= Tff7b72lambda Te6edf3dTff7b72=Ta5d6ffbTa5d6ff'Ta5d6ff'Tb4b4b4: Te6edf3_hashlibTff7b72.Td2a8ffnewTb4b4b4(Te6edf3digestTb4b4b4, Te6edf3dTb4b4b4)

Tff7b72elseTb4b4b4:

Te6edf3digest_cons Tff7b72= Tff7b72lambda Te6edf3dTff7b72=Ta5d6ffbTa5d6ff'Ta5d6ff'Tb4b4b4: Te6edf3digestTff7b72.Td2a8ffnewTb4b4b4(Te6edf3dTb4b4b4)

Te6edf3inner Tff7b72= Te6edf3digest_consTb4b4b4(Tb4b4b4)

Te6edf3outer Tff7b72= Te6edf3digest_consTb4b4b4(Tb4b4b4)

Te6edf3blocksize Tff7b72= Tffa657getattrTb4b4b4(Te6edf3innerTb4b4b4, Ta5d6ff'Ta5d6ffblock_sizeTa5d6ff'Tb4b4b4, T79c0ff64Tb4b4b4)

Tff7b72if Tffa657lenTb4b4b4(Te6edf3keyTb4b4b4) Tff7b72> Te6edf3blocksizeTb4b4b4:

Te6edf3key Tff7b72= Te6edf3digest_consTb4b4b4(Te6edf3keyTb4b4b4)Tff7b72.Td2a8ffdigestTb4b4b4(Tb4b4b4)

Te6edf3key Tff7b72= Te6edf3key Tff7b72+ Ta5d6ffbTa5d6ff'Tffea00\x00Ta5d6ff' Tff7b72* Tb4b4b4(Te6edf3blocksize Tff7b72- Tffa657lenTb4b4b4(Te6edf3keyTb4b4b4)Tb4b4b4)

Te6edf3innerTff7b72.Td2a8ffupdateTb4b4b4(Te6edf3keyTff7b72.Td2a8fftranslateTb4b4b4(Te6edf3trans_36Tb4b4b4)Tb4b4b4)

Te6edf3outerTff7b72.Td2a8ffupdateTb4b4b4(Te6edf3keyTff7b72.Td2a8fftranslateTb4b4b4(Te6edf3trans_5CTb4b4b4)Tb4b4b4)

Te6edf3innerTff7b72.Td2a8ffupdateTb4b4b4(Te6edf3msgTb4b4b4)

Te6edf3outerTff7b72.Td2a8ffupdateTb4b4b4(Te6edf3innerTff7b72.Td2a8ffdigestTb4b4b4(Tb4b4b4)Tb4b4b4)

Tff7b72return Te6edf3outerTff7b72.Td2a8ffdigestTb4b4b4(Tb4b4b4)