diff options
| author | Simon Glass <sjg@chromium.org> | 2021-02-06 14:23:38 -0700 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2021-03-02 15:53:37 -0500 |
| commit | 1bea7cc430316674dfe3dd44b6bb53c38c4946cd (patch) | |
| tree | 8a3794f3393369965ea0b520d78211144a728b7d /lib | |
| parent | b8eb9210e778cbc2ec2e1868f71a2ce5a883d5c3 (diff) | |
tpm: Reduce duplication in a few functions
Update tpm2_clear() and tpm2_pcr_extend() so that the command size
is not repeated twice. Add a small comment to the latter.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/tpm-v2.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/lib/tpm-v2.c b/lib/tpm-v2.c index 1f3deb06e4..c4e869ec5b 100644 --- a/lib/tpm-v2.c +++ b/lib/tpm-v2.c @@ -47,9 +47,11 @@ u32 tpm2_self_test(struct udevice *dev, enum tpm2_yes_no full_test) u32 tpm2_clear(struct udevice *dev, u32 handle, const char *pw, const ssize_t pw_sz) { + /* Length of the message header, up to start of password */ + uint offset = 27; u8 command_v2[COMMAND_BUFFER_SIZE] = { tpm_u16(TPM2_ST_SESSIONS), /* TAG */ - tpm_u32(27 + pw_sz), /* Length */ + tpm_u32(offset + pw_sz), /* Length */ tpm_u32(TPM2_CC_CLEAR), /* Command code */ /* HANDLE */ @@ -64,7 +66,6 @@ u32 tpm2_clear(struct udevice *dev, u32 handle, const char *pw, tpm_u16(pw_sz), /* Size of <hmac/password> */ /* STRING(pw) <hmac/password> (if any) */ }; - unsigned int offset = 27; int ret; /* @@ -83,9 +84,11 @@ u32 tpm2_clear(struct udevice *dev, u32 handle, const char *pw, u32 tpm2_pcr_extend(struct udevice *dev, u32 index, u32 algorithm, const u8 *digest, u32 digest_len) { + /* Length of the message header, up to start of digest */ + uint offset = 33; u8 command_v2[COMMAND_BUFFER_SIZE] = { tpm_u16(TPM2_ST_SESSIONS), /* TAG */ - tpm_u32(33 + digest_len), /* Length */ + tpm_u32(offset + digest_len), /* Length */ tpm_u32(TPM2_CC_PCR_EXTEND), /* Command code */ /* HANDLE */ @@ -99,11 +102,12 @@ u32 tpm2_pcr_extend(struct udevice *dev, u32 index, u32 algorithm, 0, /* Attributes: Cont/Excl/Rst */ tpm_u16(0), /* Size of <hmac/password> */ /* <hmac/password> (if any) */ + + /* hashes */ tpm_u32(1), /* Count (number of hashes) */ tpm_u16(algorithm), /* Algorithm of the hash */ /* STRING(digest) Digest */ }; - unsigned int offset = 33; int ret; /* @@ -112,7 +116,6 @@ u32 tpm2_pcr_extend(struct udevice *dev, u32 index, u32 algorithm, */ ret = pack_byte_string(command_v2, sizeof(command_v2), "s", offset, digest, digest_len); - offset += digest_len; if (ret) return TPM_LIB_ERROR; |