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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>
This commit is contained in:
Simon Glass 2021-02-06 14:23:38 -07:00 committed by Tom Rini
parent b8eb9210e7
commit 1bea7cc430
1 changed files with 8 additions and 5 deletions
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13
lib/tpm-v2.c
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@ -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;