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construct: Add StripTrailerAdapter

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In smart cards, we every so often encounter data types that contain a
bit-mask whose length depends on whether or not there are any of the
least-significant bits are set.  So far we worked around this with
some kind of Struct('byte1', 'byte2'/COptional, 'byte3'/COptional)
approach.

Let's do thisin a generic way using the new StripTrailerAdapter.

Change-Id: I659aa7247c57c680895b0bf8412f9e477fc3587d
This commit is contained in:
Harald Welte
2024-02-04 18:55:47 +01:00
parent cd8e16fdfe
commit 7156a40187
3 changed files with 80 additions and 25 deletions
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52
pySim/global_platform/__init__.py
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@@ -124,15 +124,16 @@ class KeyInformation(BER_TLV_IE, tag=0xe0, nested=[KeyInformationData]):
pass
# GP v2.3 11.1.9
KeyUsageQualifier = Struct('byte1'/FlagsEnum(Byte, verification_encryption=0x80,
computation_decipherment=0x40,
sm_response=0x20,
sm_command=0x10,
confidentiality=0x08,
crypto_checksum=0x04,
digital_signature=0x02,
crypto_authorization=0x01),
'byte2'/COptional(FlagsEnum(Byte, key_agreement=0x80)))
KeyUsageQualifier = FlagsEnum(StripTrailerAdapter(GreedyBytes, 2),
verification_encryption=0x8000,
computation_decipherment=0x4000,
sm_response=0x2000,
sm_command=0x1000,
confidentiality=0x0800,
crypto_checksum=0x0400,
digital_signature=0x0200,
crypto_authorization=0x0100,
key_agreement=0x0080)
# GP v2.3 11.1.10
KeyAccess = Enum(Byte, sd_and_any_assoc_app=0x00, sd_only=0x01, any_assoc_app_but_not_sd=0x02,
@@ -210,13 +211,13 @@ class SupportedLFDBHAlgorithms(BER_TLV_IE, tag=0x83):
class CiphersForLFDBEncryption(BER_TLV_IE, tag=0x84):
_construct = Enum(Byte, tripledes16=0x01, aes128=0x02, aes192=0x04, aes256=0x08,
icv_supported_for_lfdb=0x80)
CipherSuitesForSignatures = Struct('byte1'/FlagsEnum(Byte, rsa1024_pkcsv15_sha1=0x01,
rsa_gt1024_pss_sha256=0x02,
single_des_plus_final_triple_des_mac_16b=0x04,
cmac_aes128=0x08, cmac_aes192=0x10, cmac_aes256=0x20,
ecdsa_ecc256_sha256=0x40, ecdsa_ecc384_sha384=0x80),
'byte2'/COptional(FlagsEnum(Byte, ecdsa_ecc512_sha512=0x01,
ecdsa_ecc_521_sha512=0x02)))
CipherSuitesForSignatures = FlagsEnum(StripTrailerAdapter(GreedyBytes, 2),
rsa1024_pkcsv15_sha1=0x0100,
rsa_gt1024_pss_sha256=0x0200,
single_des_plus_final_triple_des_mac_16b=0x0400,
cmac_aes128=0x0800, cmac_aes192=0x1000, cmac_aes256=0x2000,
ecdsa_ecc256_sha256=0x4000, ecdsa_ecc384_sha384=0x8000,
ecdsa_ecc512_sha512=0x0001, ecdsa_ecc_521_sha512=0x0002)
class CiphersForTokens(BER_TLV_IE, tag=0x85):
_construct = CipherSuitesForSignatures
class CiphersForReceipts(BER_TLV_IE, tag=0x86):
@@ -387,15 +388,16 @@ class LifeCycleState(BER_TLV_IE, tag=0x9f70):
# Section 11.4.3.1 Table 11-36 + Section 11.1.2
class Privileges(BER_TLV_IE, tag=0xc5):
_construct = Struct('byte1'/FlagsEnum(Byte, security_domain=0x80, dap_verification=0x40,
delegated_management=0x20, card_lock=0x10, card_terminate=0x08,
card_reset=0x04, cvm_management=0x02,
mandated_dap_verification=0x01),
'byte2'/COptional(FlagsEnum(Byte, trusted_path=0x80, authorized_management=0x40,
token_management=0x20, global_delete=0x10, global_lock=0x08,
global_registry=0x04, final_application=0x02, global_service=0x01)),
'byte3'/COptional(FlagsEnum(Byte, receipt_generation=0x80, ciphered_load_file_data_block=0x40,
contactless_activation=0x20, contactless_self_activation=0x10)))
_construct = FlagsEnum(StripTrailerAdapter(GreedyBytes, 3),
security_domain=0x800000, dap_verification=0x400000,
delegated_management=0x200000, card_lock=0x100000, card_terminate=0x080000,
card_reset=0x040000, cvm_management=0x020000,
mandated_dap_verification=0x010000,
trusted_path=0x8000, authorized_management=0x4000,
token_management=0x2000, global_delete=0x1000, global_lock=0x0800,
global_registry=0x0400, final_application=0x0200, global_service=0x0100,
receipt_generation=0x80, ciphered_load_file_data_block=0x40,
contactless_activation=0x20, contactless_self_activation=0x10)
# Section 11.4.3.1 Table 11-36 + Section 11.1.7
class ImplicitSelectionParameter(BER_TLV_IE, tag=0xcf):