JFIF$        dd7 

Viewing File: /usr/lib64/python3.9/site-packages/cryptography/hazmat/backends/openssl/x25519.py

# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.


from cryptography.hazmat.backends.openssl.utils import _evp_pkey_derive
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric.x25519 import (
    X25519PrivateKey,
    X25519PublicKey,
)


_X25519_KEY_SIZE = 32


class _X25519PublicKey(X25519PublicKey):
    def __init__(self, backend, evp_pkey):
        self._backend = backend
        self._evp_pkey = evp_pkey

    def public_bytes(
        self,
        encoding: serialization.Encoding,
        format: serialization.PublicFormat,
    ) -> bytes:
        if (
            encoding is serialization.Encoding.Raw
            or format is serialization.PublicFormat.Raw
        ):
            if (
                encoding is not serialization.Encoding.Raw
                or format is not serialization.PublicFormat.Raw
            ):
                raise ValueError(
                    "When using Raw both encoding and format must be Raw"
                )

            return self._raw_public_bytes()

        return self._backend._public_key_bytes(
            encoding, format, self, self._evp_pkey, None
        )

    def _raw_public_bytes(self) -> bytes:
        ucharpp = self._backend._ffi.new("unsigned char **")
        res = self._backend._lib.EVP_PKEY_get1_tls_encodedpoint(
            self._evp_pkey, ucharpp
        )
        self._backend.openssl_assert(res == 32)
        self._backend.openssl_assert(ucharpp[0] != self._backend._ffi.NULL)
        data = self._backend._ffi.gc(
            ucharpp[0], self._backend._lib.OPENSSL_free
        )
        return self._backend._ffi.buffer(data, res)[:]


class _X25519PrivateKey(X25519PrivateKey):
    def __init__(self, backend, evp_pkey):
        self._backend = backend
        self._evp_pkey = evp_pkey

    def public_key(self) -> X25519PublicKey:
        bio = self._backend._create_mem_bio_gc()
        res = self._backend._lib.i2d_PUBKEY_bio(bio, self._evp_pkey)
        self._backend.openssl_assert(res == 1)
        evp_pkey = self._backend._lib.d2i_PUBKEY_bio(
            bio, self._backend._ffi.NULL
        )
        self._backend.openssl_assert(evp_pkey != self._backend._ffi.NULL)
        evp_pkey = self._backend._ffi.gc(
            evp_pkey, self._backend._lib.EVP_PKEY_free
        )
        return _X25519PublicKey(self._backend, evp_pkey)

    def exchange(self, peer_public_key: X25519PublicKey) -> bytes:
        if not isinstance(peer_public_key, X25519PublicKey):
            raise TypeError("peer_public_key must be X25519PublicKey.")

        return _evp_pkey_derive(self._backend, self._evp_pkey, peer_public_key)

    def private_bytes(
        self,
        encoding: serialization.Encoding,
        format: serialization.PrivateFormat,
        encryption_algorithm: serialization.KeySerializationEncryption,
    ) -> bytes:
        if (
            encoding is serialization.Encoding.Raw
            or format is serialization.PublicFormat.Raw
        ):
            if (
                format is not serialization.PrivateFormat.Raw
                or encoding is not serialization.Encoding.Raw
                or not isinstance(
                    encryption_algorithm, serialization.NoEncryption
                )
            ):
                raise ValueError(
                    "When using Raw both encoding and format must be Raw "
                    "and encryption_algorithm must be NoEncryption()"
                )

            return self._raw_private_bytes()

        return self._backend._private_key_bytes(
            encoding, format, encryption_algorithm, self, self._evp_pkey, None
        )

    def _raw_private_bytes(self) -> bytes:
        # When we drop support for CRYPTOGRAPHY_OPENSSL_LESS_THAN_111 we can
        # switch this to EVP_PKEY_new_raw_private_key
        # The trick we use here is serializing to a PKCS8 key and just
        # using the last 32 bytes, which is the key itself.
        bio = self._backend._create_mem_bio_gc()
        res = self._backend._lib.i2d_PKCS8PrivateKey_bio(
            bio,
            self._evp_pkey,
            self._backend._ffi.NULL,
            self._backend._ffi.NULL,
            0,
            self._backend._ffi.NULL,
            self._backend._ffi.NULL,
        )
        self._backend.openssl_assert(res == 1)
        pkcs8 = self._backend._read_mem_bio(bio)
        self._backend.openssl_assert(len(pkcs8) == 48)
        return pkcs8[-_X25519_KEY_SIZE:]
Back to Directory  nL+D550H?Mx ,D"v]qv;6*Zqn)ZP0!1 A "#a$2Qr D8 a Ri[f\mIykIw0cuFcRı?lO7к_f˓[C$殷WF<_W ԣsKcëIzyQy/_LKℂ;C",pFA:/]=H  ~,ls/9ć:[=/#f;)x{ٛEQ )~ =𘙲r*2~ a _V=' kumFD}KYYC)({ *g&f`툪ry`=^cJ.I](*`wq1dđ#̩͑0;H]u搂@:~וKL Nsh}OIR*8:2 !lDJVo(3=M(zȰ+i*NAr6KnSl)!JJӁ* %݉?|D}d5:eP0R;{$X'xF@.ÊB {,WJuQɲRI;9QE琯62fT.DUJ;*cP A\ILNj!J۱+O\͔]ޒS߼Jȧc%ANolՎprULZԛerE2=XDXgVQeӓk yP7U*omQIs,K`)6\G3t?pgjrmۛجwluGtfh9uyP0D;Uڽ"OXlif$)&|ML0Zrm1[HXPlPR0'G=i2N+0e2]]9VTPO׮7h(F*癈'=QVZDF,d߬~TX G[`le69CR(!S2!P <0x<!1AQ "Raq02Br#SCTb ?Ζ"]mH5WR7k.ۛ!}Q~+yԏz|@T20S~Kek *zFf^2X*(@8r?CIuI|֓>^ExLgNUY+{.RѪ τV׸YTD I62'8Y27'\TP.6d&˦@Vqi|8-OΕ]ʔ U=TL8=;6c| !qfF3aů&~$l}'NWUs$Uk^SV:U# 6w++s&r+nڐ{@29 gL u"TÙM=6(^"7r}=6YݾlCuhquympǦ GjhsǜNlɻ}o7#S6aw4!OSrD57%|?x>L |/nD6?/8w#[)L7+6〼T ATg!%5MmZ/c-{1_Je"|^$'O&ޱմTrb$w)R$& N1EtdU3Uȉ1pM"N*(DNyd96.(jQ)X 5cQɎMyW?Q*!R>6=7)Xj5`J]e8%t!+'!1Q5 !1 AQaqё#2"0BRb?Gt^## .llQT $v,,m㵜5ubV =sY+@d{N! dnO<.-B;_wJt6;QJd.Qc%p{ 1,sNDdFHI0ГoXшe黅XۢF:)[FGXƹ/w_cMeD,ʡcc.WDtA$j@:) -# u c1<@ۗ9F)KJ-hpP]_x[qBlbpʖw q"LFGdƶ*s+ډ_Zc"?%t[IP 6J]#=ɺVvvCGsGh1 >)6|ey?Lӣm,4GWUi`]uJVoVDG< SB6ϏQ@ TiUlyOU0kfV~~}SZ@*WUUi##; s/[=!7}"WN]'(L! ~y5g9T̅JkbM' +s:S +B)v@Mj e Cf jE 0Y\QnzG1д~Wo{T9?`Rmyhsy3!HAD]mc1~2LSu7xT;j$`}4->L#vzŏILS ֭T{rjGKC;bpU=-`BsK.SFw4Mq]ZdHS0)tLg