Chain

Bases: Certificates

Chain holds a list of certificates in a chain of trust

Examples
Create chain
import datetime

from pki_tools import (
    Name,
    RSAKeyPair,
    SHA512,
    Chain,
    Certificate,
    Validity,
)

issuer_key = RSAKeyPair.generate()
issuer = Name(cn=["Issuer"])

validity = Validity(
    not_before=datetime.datetime.today() - datetime.timedelta(days=1),
    not_after=datetime.datetime.today() + datetime.timedelta(days=1),
)

# Create self-signed issuer cert
issuer_cert = Certificate(
    subject=issuer,
    issuer=issuer,
    validity=validity,
)
issuer_cert.sign(issuer_key, SHA512)

cert_key = RSAKeyPair.generate()
name = Name(cn=["Cert CN"])

# Create certificate singed by issuer key
cert = Certificate(
    subject=name,
    issuer=issuer,
    validity=validity,
)
cert.sign(issuer_key, SHA512, req_key=cert_key.public_key)

chain = Chain(certificates=[issuer_cert, cert])

print(chain)
Print output 
----------Certificate #1----------
Issuer: 'CN: Issuer'
Serial Number: 000000000000000000000000F324B06B
Signature Algorithm: SHA512
Subject: 'CN: Issuer'
Subject Public Key Info:
  Parameters:
    Key Size: '2048'
    Modulus N: |-
      24512908490847419959148488546578707070361977414313095859803549266406631884467943
      47736185510432352513271587231190286401974946318587796724342072653654191481860861
      54934391020121010189615110080522347088148793634069809754960483000826386632203570
      74720270852010035225315636529994239462493606316311687886543630281434421744491326
      99111730259813825998131004835114120995481108520887460934191068529079773779999065
      31595156496070224454783095279056429406983893698625734439655201026783277966361911
      36803965509223476031606668074978340836583934819366549600757429589418053972419117
      808170255864069660657928965745093887687188375095145919859
    Public Exponent E: '65537'
  Public Key Algorithm:
    key_size: '2048'
    modulus_n: |-
      24512908490847419959148488546578707070361977414313095859803549266406631884467943
      47736185510432352513271587231190286401974946318587796724342072653654191481860861
      54934391020121010189615110080522347088148793634069809754960483000826386632203570
      74720270852010035225315636529994239462493606316311687886543630281434421744491326
      99111730259813825998131004835114120995481108520887460934191068529079773779999065
      31595156496070224454783095279056429406983893698625734439655201026783277966361911
      36803965509223476031606668074978340836583934819366549600757429589418053972419117
      808170255864069660657928965745093887687188375095145919859
    public_exponent_e: '65537'
Validity:
  Not After: '2024-03-20 19:33:18.892956+00:00'
  Not Before: '2024-03-18 19:33:18.892942+00:00'
----------------------------------
----------Certificate #2----------
Issuer: 'CN: Issuer'
Serial Number: 000000000000000000000000803635E6
Signature Algorithm: SHA512
Subject: 'CN: Cert CN'
Subject Public Key Info:
  Parameters:
    Key Size: '2048'
    Modulus N: |-
      19722525837243147256729707527743424501691201966358125011176035630852019620432684
      33888280452899997110070739130214603301492233663748271149582925009584034197398605
      65529687610044811183554986390205164425813989860258205218774903363071682672036937
      90000253019595505038363546573367958766989435918323824165029690193800047593345327
      10740975096800488765378675539885938133592084071647692686980410524799633255683361
      89145937767282660220211128492179314412670386243074846072009966825956121063566320
      94722321854694457820606911775347912746675654229128937423685679272102158133109672
      787437074247278159877057337119200281262914762865880161033
    Public Exponent E: '65537'
  Public Key Algorithm:
    key_size: '2048'
    modulus_n: |-
      19722525837243147256729707527743424501691201966358125011176035630852019620432684
      33888280452899997110070739130214603301492233663748271149582925009584034197398605
      65529687610044811183554986390205164425813989860258205218774903363071682672036937
      90000253019595505038363546573367958766989435918323824165029690193800047593345327
      10740975096800488765378675539885938133592084071647692686980410524799633255683361
      89145937767282660220211128492179314412670386243074846072009966825956121063566320
      94722321854694457820606911775347912746675654229128937423685679272102158133109672
      787437074247278159877057337119200281262914762865880161033
    public_exponent_e: '65537'
Validity:
  Not After: '2024-03-20 19:33:18.892956+00:00'
  Not Before: '2024-03-18 19:33:18.892942+00:00'
----------------------------------
Chain certificate count: 2
InitCryptoParser.from_pem_string
chain_pem 
chain_pem = """
-----BEGIN CERTIFICATE-----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=
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
"""

from pki_tools import Chain

chain = Chain.from_pem_string(chain_pem)

print(chain)
Print output 
----------Certificate #1----------
Extensions:
  Basic Constraints (critical):
    CA: true
  Key Usage (critical): Key Cert Sign, Crl Sign
  Subject Key Identifier:
    Subject Key Identifier: 79B459E67BB6E5E40173800888C81A58F6E99B6E
Issuer: 'C: US, CN: ISRG Root X1, O: Internet Security Research Group'
Serial Number: 8210CFB0D240E3594463E0BB63828B00
Signature Algorithm: SHA256
Signature Value: |-
  551F58A9BCB2A850D00CB1D81A6920272908AC61755C8A6EF882E5692FD5F6564BB9B8731059D321
  977EE74C71FBB2D260AD39A80BEA17215685F1500E59EBCEE059E9BAC915EF869D8F8480F6E4E991
  90DC179B621B45F06695D27C6FC2EA3BEF1FCFCBD6AE27F1A9B0C8AEFD7D7E9AFA2204EBFFD97FEA
  912B22B1170E8FF28A345B58D8FC01C954B9B826CC8A8833894C2D843C82DFEE965705BA2CBBF7C4
  B7C74E3B82BE31C822737392D1C280A43939103323824C3C9F86B255981DBE29868C229B9EE26B3B
  573A82704DDC09C789CB0A074D6CE85D8EC9EFCEABC7BBB52B4E45D64AD026CCE572CA086AA595E3
  15A1F7A4EDC92C5FA5FBFFAC28022EBED77BBBE3717B9016D3075E46537C3707428CD3C4969CD599
  B52AE0951A8048AE4C3907CECC47A452952BBAB8FBADD233537DE51D4D6DD5A1B1C7426FE6402735
  5CA328B7078DE78D3390E7239FFB509C796C46D5B415B3966E7E9B0C963AB8522D3FD65BE1FB08C2
  84FE24A8A389DAAC6AE1182AB1A843615BD31FDC3B8D76F22DE88D75DF17336C3D53FB7BCB415FFF
  DCA2D06138E196B8AC5D8B37D775D533C09911AE9D41C1727584BE0241425F67244894D19B27BE07
  3FB9B84F817451E17AB7ED9D23E2BEE0D52804133C31039EDD7A6C8FC60718C67FDE478E3F289E04
  06CFA5543477BDEC899BE91743DF5BDB5FFE8E1E57A2CD409D7E6222DADE1827
Subject: 'C: US, CN: ISRG Root X1, O: Internet Security Research Group'
Subject Public Key Info:
  Parameters:
    Key Size: '4096'
    Modulus N: |-
      70947787041544537301535901656242666061055377068594452089329839660022676089997787
      91910048985433508318421191741886136781365102624725505327222341317544391810900098
      24131001234702144200501816519311599904090606194984753842587622398776018408050245
      57411602855060870889647897710470310136457737755482389335033937689298408667684282
      15066373765614712211786775130358118845898882309478554825547809248442806614129828
      27405878164907670403886160896655313460186264922042760067692235383478494519985672
      05969875291596599841244594625422741323225727652524000665148313079224811241742584
      64519514387812606321376453589275681583619617101851155025771270109223443949930789
      48994750404287047493247048147066090211292167313905862438457453781042040498702821
      43201376550202410506577825775917835692549415644757032237331025699960908320177827
      85885998547062417881194489430344773709593495168731620634615217078096898397109727
      53590949570167489887658749686740890549110678989462474318310617765270337415238713
      77080071123656361017110132805242414547822099301651526247854381379689967721519278
      96126828451450089931445135474441311260295571475700053699431432135256711052888170
      16183804256755470528641042403865830064493168693765438364296560479053823886598989
      258655438933191724193029337334607
    Public Exponent E: '65537'
  Public Key Algorithm:
    key_size: '4096'
    modulus_n: |-
      70947787041544537301535901656242666061055377068594452089329839660022676089997787
      91910048985433508318421191741886136781365102624725505327222341317544391810900098
      24131001234702144200501816519311599904090606194984753842587622398776018408050245
      57411602855060870889647897710470310136457737755482389335033937689298408667684282
      15066373765614712211786775130358118845898882309478554825547809248442806614129828
      27405878164907670403886160896655313460186264922042760067692235383478494519985672
      05969875291596599841244594625422741323225727652524000665148313079224811241742584
      64519514387812606321376453589275681583619617101851155025771270109223443949930789
      48994750404287047493247048147066090211292167313905862438457453781042040498702821
      43201376550202410506577825775917835692549415644757032237331025699960908320177827
      85885998547062417881194489430344773709593495168731620634615217078096898397109727
      53590949570167489887658749686740890549110678989462474318310617765270337415238713
      77080071123656361017110132805242414547822099301651526247854381379689967721519278
      96126828451450089931445135474441311260295571475700053699431432135256711052888170
      16183804256755470528641042403865830064493168693765438364296560479053823886598989
      258655438933191724193029337334607
    public_exponent_e: '65537'
Validity:
  Not After: '2035-06-04 11:04:38+00:00'
  Not Before: '2015-06-04 11:04:38+00:00'
Version: 2
----------------------------------
----------Certificate #2----------
Extensions:
  Authority Information Access:
    Access Description:
    - Access Location:
        name: UniformResourceIdentifier
        value: http://x1.i.lencr.org/
      Access Method: CA_ISSUERS
  Authority Key Identifier:
    Key Identifier: 79B459E67BB6E5E40173800888C81A58F6E99B6E
  Basic Constraints (critical):
    CA: true
  Certificate Policies:
  - Policy 2.23.140.1.2.1: []
  - Policy 1.3.6.1.4.1.44947.1.1.1: []
  Crl Distribution Points:
  - Full Name:
    - name: UniformResourceIdentifier
      value: http://x1.c.lencr.org/
  Extended Key Usage:
  - Client Authentication
  - Server Authentication
  Key Usage (critical): Digital Signature, Key Cert Sign, Crl Sign
  Path Lenght: 0
  Subject Key Identifier:
    Subject Key Identifier: 142EB317B75856CBAE500940E61FAF9D8B14C2C6
Issuer: 'C: US, CN: ISRG Root X1, O: Internet Security Research Group'
Serial Number: 912B084ACF0C18A753F6D62E25A75F5A
Signature Algorithm: SHA256
Signature Value: |-
  85CA4E473EA3F7854485BCD56778B29863AD754D1E963D336572542D81A0EAC3EDF820BF5FCCB770
  00B76E3BF65E94DEE4209FA6EF8BB203E7A2B5163C91CEB4ED3902E77C258A47E6656E3F46F4D9F0
  CE942BEE54CE12BC8C274BB8C1982FA2AFCD71914A08B7C8B8237B042D08F908573E83D904330A47
  2178098227C32AC89BB9CE5CF264C8C0BE79C04F8E6D440C5E92BB2EF78B10E1E81D4429DB5920ED
  63B921F81226949357A01D6504C10A22AE100D4397A1181F7EE0E08637B55AB1BD30BF876E2B2AFF
  214E1B05C3F51897F05EACC3A5B86AF02EBC3B33B9EE4BDECCFCE4AF840B863FC0554336F668E136
  176A8E99D1FFA540A734B7C0D063393539756EF2BA76C89302E9A94B6C17CE0C02D9BD81FB9FB768
  D40665B3823D7753F88E7903AD0A3107752A43D8559772C4290EF7C45D4EC8AE468430D7F2855F18
  A179BBE75E708B07E18693C3B98FDC6171252AAFDFED255052688B92DCE5D6B5E3DA7DD0876C8421
  31AE82F5FBB9ABC889173DE14CE5380EF6BD2BBD968114EBD5DB3D20A77E59D3E2F858F95BB848CD
  FE5C4F1629FE1E5523AFC811B08DEA7C9390172FFDACA20947463FF0E9B0B7FF284D6832D6675E1E
  69A393B8F59D8B2F0BD25243A66F3257654D3281DF3853855D7E5D6629EAB8DDE495B5CDB5561242
  CDC44EC6253844506DECCE005518FEE94964D44ECA979CB45BC073A8ABB847C2
Subject: 'C: US, CN: R3, O: Let''s Encrypt'
Subject Public Key Info:
  Parameters:
    Key Size: '2048'
    Modulus N: |-
      23607590023527405233483514815960094733025362836439268915823566209453533788829410
      72961269318866403396560128488938220067229162371221935157944246629213402577917087
      19030296756413322277205133704994143921747776293784333332814927820066440035084066
      69842374574620445942041275265465205367002253387972103578862358103547035353751037
      98689289193893953701371227696203175830312817811815601999781845906479379770505161
      19310429773226949916112639110772354331197195042061738975342154862253911562311683
      13218127765624386188467360149426877213161912342004781300247624712380387337803861
      727744706241919394251136381590874774264144198228326996757
    Public Exponent E: '65537'
  Public Key Algorithm:
    key_size: '2048'
    modulus_n: |-
      23607590023527405233483514815960094733025362836439268915823566209453533788829410
      72961269318866403396560128488938220067229162371221935157944246629213402577917087
      19030296756413322277205133704994143921747776293784333332814927820066440035084066
      69842374574620445942041275265465205367002253387972103578862358103547035353751037
      98689289193893953701371227696203175830312817811815601999781845906479379770505161
      19310429773226949916112639110772354331197195042061738975342154862253911562311683
      13218127765624386188467360149426877213161912342004781300247624712380387337803861
      727744706241919394251136381590874774264144198228326996757
    public_exponent_e: '65537'
Validity:
  Not After: '2025-09-15 16:00:00+00:00'
  Not Before: '2020-09-04 00:00:00+00:00'
Version: 2
----------------------------------
Chain certificate count: 2
InitCryptoParser.from_file
chain.pem 
-----BEGIN CERTIFICATE-----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=
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

from pki_tools import Chain

chain = Chain.from_file("chain.pem")

print(chain)
Print output 
----------Certificate #1----------
Extensions:
  Basic Constraints (critical):
    CA: true
  Key Usage (critical): Key Cert Sign, Crl Sign
  Subject Key Identifier:
    Subject Key Identifier: 79B459E67BB6E5E40173800888C81A58F6E99B6E
Issuer: 'C: US, CN: ISRG Root X1, O: Internet Security Research Group'
Serial Number: 8210CFB0D240E3594463E0BB63828B00
Signature Algorithm: SHA256
Signature Value: |-
  551F58A9BCB2A850D00CB1D81A6920272908AC61755C8A6EF882E5692FD5F6564BB9B8731059D321
  977EE74C71FBB2D260AD39A80BEA17215685F1500E59EBCEE059E9BAC915EF869D8F8480F6E4E991
  90DC179B621B45F06695D27C6FC2EA3BEF1FCFCBD6AE27F1A9B0C8AEFD7D7E9AFA2204EBFFD97FEA
  912B22B1170E8FF28A345B58D8FC01C954B9B826CC8A8833894C2D843C82DFEE965705BA2CBBF7C4
  B7C74E3B82BE31C822737392D1C280A43939103323824C3C9F86B255981DBE29868C229B9EE26B3B
  573A82704DDC09C789CB0A074D6CE85D8EC9EFCEABC7BBB52B4E45D64AD026CCE572CA086AA595E3
  15A1F7A4EDC92C5FA5FBFFAC28022EBED77BBBE3717B9016D3075E46537C3707428CD3C4969CD599
  B52AE0951A8048AE4C3907CECC47A452952BBAB8FBADD233537DE51D4D6DD5A1B1C7426FE6402735
  5CA328B7078DE78D3390E7239FFB509C796C46D5B415B3966E7E9B0C963AB8522D3FD65BE1FB08C2
  84FE24A8A389DAAC6AE1182AB1A843615BD31FDC3B8D76F22DE88D75DF17336C3D53FB7BCB415FFF
  DCA2D06138E196B8AC5D8B37D775D533C09911AE9D41C1727584BE0241425F67244894D19B27BE07
  3FB9B84F817451E17AB7ED9D23E2BEE0D52804133C31039EDD7A6C8FC60718C67FDE478E3F289E04
  06CFA5543477BDEC899BE91743DF5BDB5FFE8E1E57A2CD409D7E6222DADE1827
Subject: 'C: US, CN: ISRG Root X1, O: Internet Security Research Group'
Subject Public Key Info:
  Parameters:
    Key Size: '4096'
    Modulus N: |-
      70947787041544537301535901656242666061055377068594452089329839660022676089997787
      91910048985433508318421191741886136781365102624725505327222341317544391810900098
      24131001234702144200501816519311599904090606194984753842587622398776018408050245
      57411602855060870889647897710470310136457737755482389335033937689298408667684282
      15066373765614712211786775130358118845898882309478554825547809248442806614129828
      27405878164907670403886160896655313460186264922042760067692235383478494519985672
      05969875291596599841244594625422741323225727652524000665148313079224811241742584
      64519514387812606321376453589275681583619617101851155025771270109223443949930789
      48994750404287047493247048147066090211292167313905862438457453781042040498702821
      43201376550202410506577825775917835692549415644757032237331025699960908320177827
      85885998547062417881194489430344773709593495168731620634615217078096898397109727
      53590949570167489887658749686740890549110678989462474318310617765270337415238713
      77080071123656361017110132805242414547822099301651526247854381379689967721519278
      96126828451450089931445135474441311260295571475700053699431432135256711052888170
      16183804256755470528641042403865830064493168693765438364296560479053823886598989
      258655438933191724193029337334607
    Public Exponent E: '65537'
  Public Key Algorithm:
    key_size: '4096'
    modulus_n: |-
      70947787041544537301535901656242666061055377068594452089329839660022676089997787
      91910048985433508318421191741886136781365102624725505327222341317544391810900098
      24131001234702144200501816519311599904090606194984753842587622398776018408050245
      57411602855060870889647897710470310136457737755482389335033937689298408667684282
      15066373765614712211786775130358118845898882309478554825547809248442806614129828
      27405878164907670403886160896655313460186264922042760067692235383478494519985672
      05969875291596599841244594625422741323225727652524000665148313079224811241742584
      64519514387812606321376453589275681583619617101851155025771270109223443949930789
      48994750404287047493247048147066090211292167313905862438457453781042040498702821
      43201376550202410506577825775917835692549415644757032237331025699960908320177827
      85885998547062417881194489430344773709593495168731620634615217078096898397109727
      53590949570167489887658749686740890549110678989462474318310617765270337415238713
      77080071123656361017110132805242414547822099301651526247854381379689967721519278
      96126828451450089931445135474441311260295571475700053699431432135256711052888170
      16183804256755470528641042403865830064493168693765438364296560479053823886598989
      258655438933191724193029337334607
    public_exponent_e: '65537'
Validity:
  Not After: '2035-06-04 11:04:38+00:00'
  Not Before: '2015-06-04 11:04:38+00:00'
Version: 2
----------------------------------
----------Certificate #2----------
Extensions:
  Authority Information Access:
    Access Description:
    - Access Location:
        name: UniformResourceIdentifier
        value: http://x1.i.lencr.org/
      Access Method: CA_ISSUERS
  Authority Key Identifier:
    Key Identifier: 79B459E67BB6E5E40173800888C81A58F6E99B6E
  Basic Constraints (critical):
    CA: true
  Certificate Policies:
  - Policy 2.23.140.1.2.1: []
  - Policy 1.3.6.1.4.1.44947.1.1.1: []
  Crl Distribution Points:
  - Full Name:
    - name: UniformResourceIdentifier
      value: http://x1.c.lencr.org/
  Extended Key Usage:
  - Client Authentication
  - Server Authentication
  Key Usage (critical): Digital Signature, Key Cert Sign, Crl Sign
  Path Lenght: 0
  Subject Key Identifier:
    Subject Key Identifier: 142EB317B75856CBAE500940E61FAF9D8B14C2C6
Issuer: 'C: US, CN: ISRG Root X1, O: Internet Security Research Group'
Serial Number: 912B084ACF0C18A753F6D62E25A75F5A
Signature Algorithm: SHA256
Signature Value: |-
  85CA4E473EA3F7854485BCD56778B29863AD754D1E963D336572542D81A0EAC3EDF820BF5FCCB770
  00B76E3BF65E94DEE4209FA6EF8BB203E7A2B5163C91CEB4ED3902E77C258A47E6656E3F46F4D9F0
  CE942BEE54CE12BC8C274BB8C1982FA2AFCD71914A08B7C8B8237B042D08F908573E83D904330A47
  2178098227C32AC89BB9CE5CF264C8C0BE79C04F8E6D440C5E92BB2EF78B10E1E81D4429DB5920ED
  63B921F81226949357A01D6504C10A22AE100D4397A1181F7EE0E08637B55AB1BD30BF876E2B2AFF
  214E1B05C3F51897F05EACC3A5B86AF02EBC3B33B9EE4BDECCFCE4AF840B863FC0554336F668E136
  176A8E99D1FFA540A734B7C0D063393539756EF2BA76C89302E9A94B6C17CE0C02D9BD81FB9FB768
  D40665B3823D7753F88E7903AD0A3107752A43D8559772C4290EF7C45D4EC8AE468430D7F2855F18
  A179BBE75E708B07E18693C3B98FDC6171252AAFDFED255052688B92DCE5D6B5E3DA7DD0876C8421
  31AE82F5FBB9ABC889173DE14CE5380EF6BD2BBD968114EBD5DB3D20A77E59D3E2F858F95BB848CD
  FE5C4F1629FE1E5523AFC811B08DEA7C9390172FFDACA20947463FF0E9B0B7FF284D6832D6675E1E
  69A393B8F59D8B2F0BD25243A66F3257654D3281DF3853855D7E5D6629EAB8DDE495B5CDB5561242
  CDC44EC6253844506DECCE005518FEE94964D44ECA979CB45BC073A8ABB847C2
Subject: 'C: US, CN: R3, O: Let''s Encrypt'
Subject Public Key Info:
  Parameters:
    Key Size: '2048'
    Modulus N: |-
      23607590023527405233483514815960094733025362836439268915823566209453533788829410
      72961269318866403396560128488938220067229162371221935157944246629213402577917087
      19030296756413322277205133704994143921747776293784333332814927820066440035084066
      69842374574620445942041275265465205367002253387972103578862358103547035353751037
      98689289193893953701371227696203175830312817811815601999781845906479379770505161
      19310429773226949916112639110772354331197195042061738975342154862253911562311683
      13218127765624386188467360149426877213161912342004781300247624712380387337803861
      727744706241919394251136381590874774264144198228326996757
    Public Exponent E: '65537'
  Public Key Algorithm:
    key_size: '2048'
    modulus_n: |-
      23607590023527405233483514815960094733025362836439268915823566209453533788829410
      72961269318866403396560128488938220067229162371221935157944246629213402577917087
      19030296756413322277205133704994143921747776293784333332814927820066440035084066
      69842374574620445942041275265465205367002253387972103578862358103547035353751037
      98689289193893953701371227696203175830312817811815601999781845906479379770505161
      19310429773226949916112639110772354331197195042061738975342154862253911562311683
      13218127765624386188467360149426877213161912342004781300247624712380387337803861
      727744706241919394251136381590874774264144198228326996757
    public_exponent_e: '65537'
Validity:
  Not After: '2025-09-15 16:00:00+00:00'
  Not Before: '2020-09-04 00:00:00+00:00'
Version: 2
----------------------------------
Chain certificate count: 2
InitCryptoParser.to_file
chain_pem 
chain_pem = """
-----BEGIN CERTIFICATE-----
MIIFazCCA1OgAwIBAgIRAIIQz7DSQONZRGPgu2OCiwAwDQYJKoZIhvcNAQELBQAw
TzELMAkGA1UEBhMCVVMxKTAnBgNVBAoTIEludGVybmV0IFNlY3VyaXR5IFJlc2Vh
cmNoIEdyb3VwMRUwEwYDVQQDEwxJU1JHIFJvb3QgWDEwHhcNMTUwNjA0MTEwNDM4
WhcNMzUwNjA0MTEwNDM4WjBPMQswCQYDVQQGEwJVUzEpMCcGA1UEChMgSW50ZXJu
ZXQgU2VjdXJpdHkgUmVzZWFyY2ggR3JvdXAxFTATBgNVBAMTDElTUkcgUm9vdCBY
MTCCAiIwDQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBAK3oJHP0FDfzm54rVygc
h77ct984kIxuPOZXoHj3dcKi/vVqbvYATyjb3miGbESTtrFj/RQSa78f0uoxmyF+
0TM8ukj13Xnfs7j/EvEhmkvBioZxaUpmZmyPfjxwv60pIgbz5MDmgK7iS4+3mX6U
A5/TR5d8mUgjU+g4rk8Kb4Mu0UlXjIB0ttov0DiNewNwIRt18jA8+o+u3dpjq+sW
T8KOEUt+zwvo/7V3LvSye0rgTBIlDHCNAymg4VMk7BPZ7hm/ELNKjD+Jo2FR3qyH
B5T0Y3HsLuJvW5iB4YlcNHlsdu87kGJ55tukmi8mxdAQ4Q7e2RCOFvu396j3x+UC
B5iPNgiV5+I3lg02dZ77DnKxHZu8A/lJBdiB3QW0KtZB6awBdpUKD9jf1b0SHzUv
KBds0pjBqAlkd25HN7rOrFleaJ1/ctaJxQZBKT5ZPt0m9STJEadao0xAH0ahmbWn
OlFuhjuefXKnEgV4We0+UXgVCwOPjdAvBbI+e0ocS3MFEvzG6uBQE3xDk3SzynTn
jh8BCNAw1FtxNrQHusEwMFxIt4I7mKZ9YIqioymCzLq9gwQbooMDQaHWBfEbwrbw
qHyGO0aoSCqI3Haadr8faqU9GY/rOPNk3sgrDQoo//fb4hVC1CLQJ13hef4Y53CI
rU7m2Ys6xt0nUW7/vGT1M0NPAgMBAAGjQjBAMA4GA1UdDwEB/wQEAwIBBjAPBgNV
HRMBAf8EBTADAQH/MB0GA1UdDgQWBBR5tFnme7bl5AFzgAiIyBpY9umbbjANBgkq
hkiG9w0BAQsFAAOCAgEAVR9YqbyyqFDQDLHYGmkgJykIrGF1XIpu+ILlaS/V9lZL
ubhzEFnTIZd+50xx+7LSYK05qAvqFyFWhfFQDlnrzuBZ6brJFe+GnY+EgPbk6ZGQ
3BebYhtF8GaV0nxvwuo77x/Py9auJ/GpsMiu/X1+mvoiBOv/2X/qkSsisRcOj/KK
NFtY2PwByVS5uCbMiogziUwthDyC3+6WVwW6LLv3xLfHTjuCvjHIInNzktHCgKQ5
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emyPxgcYxn/eR44/KJ4EBs+lVDR3veyJm+kXQ99b21/+jh5Xos1AnX5iItreGCc=
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIFFjCCAv6gAwIBAgIRAJErCErPDBinU/bWLiWnX1owDQYJKoZIhvcNAQELBQAw
TzELMAkGA1UEBhMCVVMxKTAnBgNVBAoTIEludGVybmV0IFNlY3VyaXR5IFJlc2Vh
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Z3Vms/EY96Jc5lP/Ooi2R6X/ExjqmAl3P51T+c8B5fWmcBcUr2Ok/5mzk53cU6cG
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hCExroL1+7mryIkXPeFM5TgO9r0rvZaBFOvV2z0gp35Z0+L4WPlbuEjN/lxPFin+
HlUjr8gRsI3qfJOQFy/9rKIJR0Y/8Omwt/8oTWgy1mdeHmmjk7j1nYsvC9JSQ6Zv
MldlTTKB3zhThV1+XWYp6rjd5JW1zbVWEkLNxE7GJThEUG3szgBVGP7pSWTUTsqX
nLRbwHOoq7hHwg==
-----END CERTIFICATE-----
"""

from pki_tools import Chain

chain = Chain.from_pem_string(chain_pem)

chain.to_file("out_chain.pem")
out_cert.pem 
-----BEGIN CERTIFICATE-----
MIIFazCCA1OgAwIBAgIRAIIQz7DSQONZRGPgu2OCiwAwDQYJKoZIhvcNAQELBQAw
TzELMAkGA1UEBhMCVVMxKTAnBgNVBAoTIEludGVybmV0IFNlY3VyaXR5IFJlc2Vh
cmNoIEdyb3VwMRUwEwYDVQQDEwxJU1JHIFJvb3QgWDEwHhcNMTUwNjA0MTEwNDM4
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oyi3B43njTOQ5yOf+1CceWxG1bQVs5ZufpsMljq4Ui0/1lvh+wjChP4kqKOJ2qxq
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mRGunUHBcnWEvgJBQl9nJEiU0Zsnvgc/ubhPgXRR4Xq37Z0j4r7g1SgEEzwxA57d
emyPxgcYxn/eR44/KJ4EBs+lVDR3veyJm+kXQ99b21/+jh5Xos1AnX5iItreGCc=
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIFFjCCAv6gAwIBAgIRAJErCErPDBinU/bWLiWnX1owDQYJKoZIhvcNAQELBQAw
TzELMAkGA1UEBhMCVVMxKTAnBgNVBAoTIEludGVybmV0IFNlY3VyaXR5IFJlc2Vh
cmNoIEdyb3VwMRUwEwYDVQQDEwxJU1JHIFJvb3QgWDEwHhcNMjAwOTA0MDAwMDAw
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RW5jcnlwdDELMAkGA1UEAxMCUjMwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK
AoIBAQC7AhUozPaglNMPEuyNVZLD+ILxmaZ6QoinXSaqtSu5xUyxr45r+XXIo9cP
R5QUVTVXjJ6oojkZ9YI8QqlObvU7wy7bjcCwXPNZOOftz2nwWgsbvsCUJCWH+jdx
sxPnHKzhm+/b5DtFUkWWqcFTzjTIUu61ru2P3mBw4qVUq7ZtDpelQDRrK9O8Zutm
NHz6a4uPVymZ+DAXXbpyb/uBxa3Shlg9F8fnCbvxK/eG3MHacV3URuPMrSXBiLxg
Z3Vms/EY96Jc5lP/Ooi2R6X/ExjqmAl3P51T+c8B5fWmcBcUr2Ok/5mzk53cU6cG
/kiFHaFpriV1uxPMUgP17VGhi9sVAgMBAAGjggEIMIIBBDAOBgNVHQ8BAf8EBAMC
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Af8CAQAwHQYDVR0OBBYEFBQusxe3WFbLrlAJQOYfr52LFMLGMB8GA1UdIwQYMBaA
FHm0WeZ7tuXkAXOACIjIGlj26ZtuMDIGCCsGAQUFBwEBBCYwJDAiBggrBgEFBQcw
AoYWaHR0cDovL3gxLmkubGVuY3Iub3JnLzAnBgNVHR8EIDAeMBygGqAYhhZodHRw
Oi8veDEuYy5sZW5jci5vcmcvMCIGA1UdIAQbMBkwCAYGZ4EMAQIBMA0GCysGAQQB
gt8TAQEBMA0GCSqGSIb3DQEBCwUAA4ICAQCFyk5HPqP3hUSFvNVneLKYY611TR6W
PTNlclQtgaDqw+34IL9fzLdwALduO/ZelN7kIJ+m74uyA+eitRY8kc607TkC53wl
ikfmZW4/RvTZ8M6UK+5UzhK8jCdLuMGYL6KvzXGRSgi3yLgjewQtCPkIVz6D2QQz
CkcheAmCJ8MqyJu5zlzyZMjAvnnAT45tRAxekrsu94sQ4egdRCnbWSDtY7kh+BIm
lJNXoB1lBMEKIq4QDUOXoRgffuDghje1WrG9ML+Hbisq/yFOGwXD9RiX8F6sw6W4
avAuvDszue5L3sz85K+EC4Y/wFVDNvZo4TYXao6Z0f+lQKc0t8DQYzk1OXVu8rp2
yJMC6alLbBfODALZvYH7n7do1AZls4I9d1P4jnkDrQoxB3UqQ9hVl3LEKQ73xF1O
yK5GhDDX8oVfGKF5u+decIsH4YaTw7mP3GFxJSqv3+0lUFJoi5Lc5da149p90Ids
hCExroL1+7mryIkXPeFM5TgO9r0rvZaBFOvV2z0gp35Z0+L4WPlbuEjN/lxPFin+
HlUjr8gRsI3qfJOQFy/9rKIJR0Y/8Omwt/8oTWgy1mdeHmmjk7j1nYsvC9JSQ6Zv
MldlTTKB3zhThV1+XWYp6rjd5JW1zbVWEkLNxE7GJThEUG3szgBVGP7pSWTUTsqX
nLRbwHOoq7hHwg==
-----END CERTIFICATE-----
Certificates.from_cryptography
chain_pem 
from cryptography import x509

chain_pem = """
-----BEGIN CERTIFICATE-----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=
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
"""

crypto_certs = x509.load_pem_x509_certificates(chain_pem.encode())

from pki_tools import Chain

chain = Chain.from_cryptography(crypto_certs)

print(chain)
Print output 
----------Certificate #1----------
Extensions:
  Basic Constraints (critical):
    CA: true
  Key Usage (critical): Key Cert Sign, Crl Sign
  Subject Key Identifier:
    Subject Key Identifier: 79B459E67BB6E5E40173800888C81A58F6E99B6E
Issuer: 'C: US, CN: ISRG Root X1, O: Internet Security Research Group'
Serial Number: 8210CFB0D240E3594463E0BB63828B00
Signature Algorithm: SHA256
Signature Value: |-
  551F58A9BCB2A850D00CB1D81A6920272908AC61755C8A6EF882E5692FD5F6564BB9B8731059D321
  977EE74C71FBB2D260AD39A80BEA17215685F1500E59EBCEE059E9BAC915EF869D8F8480F6E4E991
  90DC179B621B45F06695D27C6FC2EA3BEF1FCFCBD6AE27F1A9B0C8AEFD7D7E9AFA2204EBFFD97FEA
  912B22B1170E8FF28A345B58D8FC01C954B9B826CC8A8833894C2D843C82DFEE965705BA2CBBF7C4
  B7C74E3B82BE31C822737392D1C280A43939103323824C3C9F86B255981DBE29868C229B9EE26B3B
  573A82704DDC09C789CB0A074D6CE85D8EC9EFCEABC7BBB52B4E45D64AD026CCE572CA086AA595E3
  15A1F7A4EDC92C5FA5FBFFAC28022EBED77BBBE3717B9016D3075E46537C3707428CD3C4969CD599
  B52AE0951A8048AE4C3907CECC47A452952BBAB8FBADD233537DE51D4D6DD5A1B1C7426FE6402735
  5CA328B7078DE78D3390E7239FFB509C796C46D5B415B3966E7E9B0C963AB8522D3FD65BE1FB08C2
  84FE24A8A389DAAC6AE1182AB1A843615BD31FDC3B8D76F22DE88D75DF17336C3D53FB7BCB415FFF
  DCA2D06138E196B8AC5D8B37D775D533C09911AE9D41C1727584BE0241425F67244894D19B27BE07
  3FB9B84F817451E17AB7ED9D23E2BEE0D52804133C31039EDD7A6C8FC60718C67FDE478E3F289E04
  06CFA5543477BDEC899BE91743DF5BDB5FFE8E1E57A2CD409D7E6222DADE1827
Subject: 'C: US, CN: ISRG Root X1, O: Internet Security Research Group'
Subject Public Key Info:
  Parameters:
    Key Size: '4096'
    Modulus N: |-
      70947787041544537301535901656242666061055377068594452089329839660022676089997787
      91910048985433508318421191741886136781365102624725505327222341317544391810900098
      24131001234702144200501816519311599904090606194984753842587622398776018408050245
      57411602855060870889647897710470310136457737755482389335033937689298408667684282
      15066373765614712211786775130358118845898882309478554825547809248442806614129828
      27405878164907670403886160896655313460186264922042760067692235383478494519985672
      05969875291596599841244594625422741323225727652524000665148313079224811241742584
      64519514387812606321376453589275681583619617101851155025771270109223443949930789
      48994750404287047493247048147066090211292167313905862438457453781042040498702821
      43201376550202410506577825775917835692549415644757032237331025699960908320177827
      85885998547062417881194489430344773709593495168731620634615217078096898397109727
      53590949570167489887658749686740890549110678989462474318310617765270337415238713
      77080071123656361017110132805242414547822099301651526247854381379689967721519278
      96126828451450089931445135474441311260295571475700053699431432135256711052888170
      16183804256755470528641042403865830064493168693765438364296560479053823886598989
      258655438933191724193029337334607
    Public Exponent E: '65537'
  Public Key Algorithm:
    key_size: '4096'
    modulus_n: |-
      70947787041544537301535901656242666061055377068594452089329839660022676089997787
      91910048985433508318421191741886136781365102624725505327222341317544391810900098
      24131001234702144200501816519311599904090606194984753842587622398776018408050245
      57411602855060870889647897710470310136457737755482389335033937689298408667684282
      15066373765614712211786775130358118845898882309478554825547809248442806614129828
      27405878164907670403886160896655313460186264922042760067692235383478494519985672
      05969875291596599841244594625422741323225727652524000665148313079224811241742584
      64519514387812606321376453589275681583619617101851155025771270109223443949930789
      48994750404287047493247048147066090211292167313905862438457453781042040498702821
      43201376550202410506577825775917835692549415644757032237331025699960908320177827
      85885998547062417881194489430344773709593495168731620634615217078096898397109727
      53590949570167489887658749686740890549110678989462474318310617765270337415238713
      77080071123656361017110132805242414547822099301651526247854381379689967721519278
      96126828451450089931445135474441311260295571475700053699431432135256711052888170
      16183804256755470528641042403865830064493168693765438364296560479053823886598989
      258655438933191724193029337334607
    public_exponent_e: '65537'
Validity:
  Not After: '2035-06-04 11:04:38+00:00'
  Not Before: '2015-06-04 11:04:38+00:00'
Version: 2
----------------------------------
----------Certificate #2----------
Extensions:
  Authority Information Access:
    Access Description:
    - Access Location:
        name: UniformResourceIdentifier
        value: http://x1.i.lencr.org/
      Access Method: CA_ISSUERS
  Authority Key Identifier:
    Key Identifier: 79B459E67BB6E5E40173800888C81A58F6E99B6E
  Basic Constraints (critical):
    CA: true
  Certificate Policies:
  - Policy 2.23.140.1.2.1: []
  - Policy 1.3.6.1.4.1.44947.1.1.1: []
  Crl Distribution Points:
  - Full Name:
    - name: UniformResourceIdentifier
      value: http://x1.c.lencr.org/
  Extended Key Usage:
  - Client Authentication
  - Server Authentication
  Key Usage (critical): Digital Signature, Key Cert Sign, Crl Sign
  Path Lenght: 0
  Subject Key Identifier:
    Subject Key Identifier: 142EB317B75856CBAE500940E61FAF9D8B14C2C6
Issuer: 'C: US, CN: ISRG Root X1, O: Internet Security Research Group'
Serial Number: 912B084ACF0C18A753F6D62E25A75F5A
Signature Algorithm: SHA256
Signature Value: |-
  85CA4E473EA3F7854485BCD56778B29863AD754D1E963D336572542D81A0EAC3EDF820BF5FCCB770
  00B76E3BF65E94DEE4209FA6EF8BB203E7A2B5163C91CEB4ED3902E77C258A47E6656E3F46F4D9F0
  CE942BEE54CE12BC8C274BB8C1982FA2AFCD71914A08B7C8B8237B042D08F908573E83D904330A47
  2178098227C32AC89BB9CE5CF264C8C0BE79C04F8E6D440C5E92BB2EF78B10E1E81D4429DB5920ED
  63B921F81226949357A01D6504C10A22AE100D4397A1181F7EE0E08637B55AB1BD30BF876E2B2AFF
  214E1B05C3F51897F05EACC3A5B86AF02EBC3B33B9EE4BDECCFCE4AF840B863FC0554336F668E136
  176A8E99D1FFA540A734B7C0D063393539756EF2BA76C89302E9A94B6C17CE0C02D9BD81FB9FB768
  D40665B3823D7753F88E7903AD0A3107752A43D8559772C4290EF7C45D4EC8AE468430D7F2855F18
  A179BBE75E708B07E18693C3B98FDC6171252AAFDFED255052688B92DCE5D6B5E3DA7DD0876C8421
  31AE82F5FBB9ABC889173DE14CE5380EF6BD2BBD968114EBD5DB3D20A77E59D3E2F858F95BB848CD
  FE5C4F1629FE1E5523AFC811B08DEA7C9390172FFDACA20947463FF0E9B0B7FF284D6832D6675E1E
  69A393B8F59D8B2F0BD25243A66F3257654D3281DF3853855D7E5D6629EAB8DDE495B5CDB5561242
  CDC44EC6253844506DECCE005518FEE94964D44ECA979CB45BC073A8ABB847C2
Subject: 'C: US, CN: R3, O: Let''s Encrypt'
Subject Public Key Info:
  Parameters:
    Key Size: '2048'
    Modulus N: |-
      23607590023527405233483514815960094733025362836439268915823566209453533788829410
      72961269318866403396560128488938220067229162371221935157944246629213402577917087
      19030296756413322277205133704994143921747776293784333332814927820066440035084066
      69842374574620445942041275265465205367002253387972103578862358103547035353751037
      98689289193893953701371227696203175830312817811815601999781845906479379770505161
      19310429773226949916112639110772354331197195042061738975342154862253911562311683
      13218127765624386188467360149426877213161912342004781300247624712380387337803861
      727744706241919394251136381590874774264144198228326996757
    Public Exponent E: '65537'
  Public Key Algorithm:
    key_size: '2048'
    modulus_n: |-
      23607590023527405233483514815960094733025362836439268915823566209453533788829410
      72961269318866403396560128488938220067229162371221935157944246629213402577917087
      19030296756413322277205133704994143921747776293784333332814927820066440035084066
      69842374574620445942041275265465205367002253387972103578862358103547035353751037
      98689289193893953701371227696203175830312817811815601999781845906479379770505161
      19310429773226949916112639110772354331197195042061738975342154862253911562311683
      13218127765624386188467360149426877213161912342004781300247624712380387337803861
      727744706241919394251136381590874774264144198228326996757
    public_exponent_e: '65537'
Validity:
  Not After: '2025-09-15 16:00:00+00:00'
  Not Before: '2020-09-04 00:00:00+00:00'
Version: 2
----------------------------------
Chain certificate count: 2
Certificates.from_uri
from pki_tools import Chain

chain = Chain.from_uri(
    [
        "https://letsencrypt.org/certs/isrgrootx1.pem",
        "https://letsencrypt.org/certs/lets-encrypt-r3.pem",
    ]
)

print(chain)
Print output
check_chain 
check_chain()

Validate the chain (if it contains more than one certificate) checking expiration and signatures of all certificates in the chain

Raises:
get_issuer 
get_issuer(signed: [Certificate, CertificateRevocationList]) -> Certificate

Returns the issuer of a signed entity

Parameters:

Returns: The issuer of the signed entity

Raises: