## Overview Introduce tpm2_key_rsa module, which implements asymmetric TPM2 RSA key. The feature can be enabled with the CONFIG_ASYMMETRIC_TPM2_KEY_RSA_SUBTYPE kconfig option. The idea in the design is to over time to have submodule per key type For instance, tpm2_key_ecdsa could be one potential future addition in the future. Perhaps, it might sense to consider at that point also a top-level tpm2_key module. The gist is that the naming convention is free from potential future bottlencks. ## Change Log v3: * Dropped special policy when RH_NULL is given. Kernel will just try to use the handle as parent given. * Thus could drop the patch exporting tpm2_load_context(). v2: * Cleaned up all the low-hanging fruit for the sake of saving everyones time. After this I move into reactive mode (I promise) ;-) ## Testing tpm2_createprimary --hierarchy o -G rsa2048 -c owner.txt tpm2_evictcontrol -c owner.txt 0x81000001 tpm2_getcap handles-persistent openssl genrsa -out private.pem 2048 tpm2_import -C 0x81000001 -G rsa -i private.pem -u key.pub -r key.priv tpm2_encodeobject -C 0x81000001 -u key.pub -r key.priv -o key.priv.pem openssl asn1parse -inform pem -in key.priv.pem -noout -out key.priv.der serial=`cat key.priv.der | keyctl padd asymmetric tpm @u` echo "abcdefg" > plaintext.txt keyctl pkey_encrypt $serial 0 plaintext.txt enc=pkcs1 > encrypted.dat keyctl pkey_decrypt $serial 0 encrypted.dat enc=pkcs1 > decrypted.dat keyctl pkey_sign $serial 0 plaintext.txt enc=pkcs1 hash=sha256 > signed.dat keyctl pkey_verify $serial 0 plaintext.txt signed.dat enc=pkcs1 hash=sha256 ## References - v2: https://lore.kernel.org/linux-integrity/20240521031645.17008-1-jarkko@xxxxxxxxxx/ - v1: https://lore.kernel.org/linux-integrity/20240520184727.22038-1-jarkko@xxxxxxxxxx/ - Derived from https://lore.kernel.org/all/20200518172704.29608-1-prestwoj@xxxxxxxxx/ James Prestwood (1): keys: asymmetric: ASYMMETRIC_TPM2_KEY_RSA_SUBTYPE Jarkko Sakkinen (4): crypto: rsa-pkcs1pad: export rsa1_asn_lookup() lib: Expand asn1_encode_integer() to variable size integers KEYS: trusted: Move tpm2_key_decode() to the TPM driver tpm: tpm2_key: Extend parser to TPM_LoadableKey crypto/asymmetric_keys/Kconfig | 16 + crypto/asymmetric_keys/Makefile | 1 + crypto/asymmetric_keys/tpm2_key_rsa.c | 688 ++++++++++++++++++ crypto/rsa-pkcs1pad.c | 16 +- drivers/char/tpm/Kconfig | 1 + drivers/char/tpm/Makefile | 5 + drivers/char/tpm/tpm2_key.c | 118 +++ .../char/tpm}/tpm2key.asn1 | 0 include/crypto/rsa-pkcs1pad.h | 20 + include/crypto/tpm2_key.h | 35 + include/linux/asn1_encoder.h | 3 +- include/linux/tpm.h | 2 + lib/asn1_encoder.c | 185 ++--- security/keys/trusted-keys/Makefile | 2 - security/keys/trusted-keys/trusted_tpm2.c | 135 +--- 15 files changed, 1020 insertions(+), 207 deletions(-) create mode 100644 crypto/asymmetric_keys/tpm2_key_rsa.c create mode 100644 drivers/char/tpm/tpm2_key.c rename {security/keys/trusted-keys => drivers/char/tpm}/tpm2key.asn1 (100%) create mode 100644 include/crypto/rsa-pkcs1pad.h create mode 100644 include/crypto/tpm2_key.h -- 2.45.1
