Fixed loading of parent handles in TPM TSS2 keys #153
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We need to make sure to be able to load TPM2 TSS2 keys which have been created with earlier versions of the tpm2-openssl provider or with earlier versions of the tpm2-tss-engine. The parent handle of TPM2_TSS keys created with provider version < 1.2 or engine version < 1.2.0-rc0 have been written using ASN1_INTEGER_set ASN1_INTEGER_set takes a (signed) long (which on 32-bit systems is 32-bit and on 64-bit systems is 64bit) As parent handles are in the range of 0x81000000 - 0x81FFFFFF the MSB on a 32-bit system is always set, and therefore is treated as negative. This won't be the case on 64 bit systems or in case the handle had been written using BN_set_word(). The parent handle of TPM2_TSS keys create with provider verision 1.2 - 1.3 have been written using ASN1_INTEGER_set_uint64. These values can safely be read using BN_get_word, as the values written always were of type TPM2_HANDLE (uint32_t). Resolves: tpm2-software#152 See also: tpm2-software#74, tpm2-software/tpm2-tss-engine#222, tpm2-software/tpm2-tools#3113 Signed-off-by: Thomas Kopp <thomas.kopp@securiton.ch>
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We need to make sure to be able to load TPM2 TSS2 keys which have been created with earlier versions of the tpm2-openssl provider or with earlier versions of the tpm2-tss-engine.
The parent handle of TPM2_TSS keys created with provider version < 1.2 or engine version < 1.2.0-rc0 have been written using ASN1_INTEGER_set ASN1_INTEGER_set takes a (signed) long (which on 32-bit systems is 32-bit and on 64-bit systems is 64bit) As parent handles are in the range of 0x81000000 - 0x81FFFFFF the MSB on a 32-bit system is always set, and therefore is treated as negative. This won't be the case on 64 bit systems or in case the handle had been written using BN_set_word().
The parent handle of TPM2_TSS keys create with provider verision 1.2 - 1.3 have been written using ASN1_INTEGER_set_uint64. These values can safely be read using BN_get_word, as the values written always were of type TPM2_HANDLE (uint32_t).
Resolves: #152
See also: #74,
tpm2-software/tpm2-tss-engine#222, tpm2-software/tpm2-tools#3113