diff options
| author | Ilias Apalodimas | 2020-11-26 23:07:22 +0200 |
|---|---|---|
| committer | Heinrich Schuchardt | 2020-12-03 21:22:40 +0100 |
| commit | e926136bb29cb9dda00f1b8960db963b6e97124b (patch) | |
| tree | 6125a0fcda8cb9d079013084754843f21616ce51 /lib/tpm-v2.c | |
| parent | fc364424ac992ddae5779ae3ca8ddcd006a6ea27 (diff) | |
tpm: use more than sha256 on pcr_extend
The current tpm2_pcr_extend is hardcoded using SHA256.
Let's make the actual command to the TPM2 configurable so we can support
a wider range of algorithms and keep the current command line as-is i.e
limited to SHA256 only
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'lib/tpm-v2.c')
| -rw-r--r-- | lib/tpm-v2.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/lib/tpm-v2.c b/lib/tpm-v2.c index 91759068cf0..1f3deb06e48 100644 --- a/lib/tpm-v2.c +++ b/lib/tpm-v2.c @@ -80,11 +80,12 @@ u32 tpm2_clear(struct udevice *dev, u32 handle, const char *pw, return tpm_sendrecv_command(dev, command_v2, NULL, NULL); } -u32 tpm2_pcr_extend(struct udevice *dev, u32 index, const uint8_t *digest) +u32 tpm2_pcr_extend(struct udevice *dev, u32 index, u32 algorithm, + const u8 *digest, u32 digest_len) { u8 command_v2[COMMAND_BUFFER_SIZE] = { tpm_u16(TPM2_ST_SESSIONS), /* TAG */ - tpm_u32(33 + TPM2_DIGEST_LEN), /* Length */ + tpm_u32(33 + digest_len), /* Length */ tpm_u32(TPM2_CC_PCR_EXTEND), /* Command code */ /* HANDLE */ @@ -99,7 +100,7 @@ u32 tpm2_pcr_extend(struct udevice *dev, u32 index, const uint8_t *digest) tpm_u16(0), /* Size of <hmac/password> */ /* <hmac/password> (if any) */ tpm_u32(1), /* Count (number of hashes) */ - tpm_u16(TPM2_ALG_SHA256), /* Algorithm of the hash */ + tpm_u16(algorithm), /* Algorithm of the hash */ /* STRING(digest) Digest */ }; unsigned int offset = 33; @@ -110,8 +111,8 @@ u32 tpm2_pcr_extend(struct udevice *dev, u32 index, const uint8_t *digest) * - the digest */ ret = pack_byte_string(command_v2, sizeof(command_v2), "s", - offset, digest, TPM2_DIGEST_LEN); - offset += TPM2_DIGEST_LEN; + offset, digest, digest_len); + offset += digest_len; if (ret) return TPM_LIB_ERROR; |