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author | Simon Glass <sjg@chromium.org> | 2021-02-06 14:23:38 -0700 |
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committer | Tom Rini <trini@konsulko.com> | 2021-03-02 11:26:27 -0500 |
commit | a07ec1f271f4da7852aa4c35d8dbb65004fa7e96 (patch) | |
tree | f5c23f1fd47ea65c9e74af4fe86c9f59031d4600 | |
parent | 4bd489880151ef9707b81912f36103434d66377f (diff) | |
download | u-boot-a07ec1f271f4da7852aa4c35d8dbb65004fa7e96.zip u-boot-a07ec1f271f4da7852aa4c35d8dbb65004fa7e96.tar.gz u-boot-a07ec1f271f4da7852aa4c35d8dbb65004fa7e96.tar.bz2 |
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>
-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 1f3deb0..c4e869e 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; |