diff options
Diffstat (limited to 'lib/tpm-v2.c')
| -rw-r--r-- | lib/tpm-v2.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/lib/tpm-v2.c b/lib/tpm-v2.c index ffe8613..f1bbca8 100644 --- a/lib/tpm-v2.c +++ b/lib/tpm-v2.c @@ -317,3 +317,103 @@ int tpm2_change_auth(u32 handle, const char *newpw, const ssize_t newpw_sz, return tpm_sendrecv_command(command_v2, NULL, NULL); } + +u32 tpm2_pcr_setauthpolicy(const char *pw, const ssize_t pw_sz, u32 index, + const char *key) +{ + u8 command_v2[COMMAND_BUFFER_SIZE] = { + tpm_u16(TPM2_ST_SESSIONS), /* TAG */ + tpm_u32(35 + pw_sz + TPM2_DIGEST_LEN), /* Length */ + tpm_u32(TPM2_CC_PCR_SETAUTHPOL), /* Command code */ + + /* HANDLE */ + tpm_u32(TPM2_RH_PLATFORM), /* TPM resource handle */ + + /* AUTH_SESSION */ + tpm_u32(9 + pw_sz), /* Authorization size */ + tpm_u32(TPM2_RS_PW), /* session handle */ + tpm_u16(0), /* Size of <nonce> */ + /* <nonce> (if any) */ + 0, /* Attributes: Cont/Excl/Rst */ + tpm_u16(pw_sz) /* Size of <hmac/password> */ + /* STRING(pw) <hmac/password> (if any) */ + + /* TPM2B_AUTH (TPM2B_DIGEST) */ + /* tpm_u16(TPM2_DIGEST_LEN) Digest size length */ + /* STRING(key) Digest buffer (PCR key) */ + + /* TPMI_ALG_HASH */ + /* tpm_u16(TPM2_ALG_SHA256) Algorithm of the hash */ + + /* TPMI_DH_PCR */ + /* tpm_u32(index), PCR Index */ + }; + unsigned int offset = 27; + int ret; + + /* + * Fill the command structure starting from the first buffer: + * - the password (if any) + * - the PCR key length + * - the PCR key + * - the hash algorithm + * - the PCR index + */ + ret = pack_byte_string(command_v2, sizeof(command_v2), "swswd", + offset, pw, pw_sz, + offset + pw_sz, TPM2_DIGEST_LEN, + offset + pw_sz + 2, key, TPM2_DIGEST_LEN, + offset + pw_sz + 2 + TPM2_DIGEST_LEN, + TPM2_ALG_SHA256, + offset + pw_sz + 4 + TPM2_DIGEST_LEN, index); + offset += pw_sz + 2 + TPM2_DIGEST_LEN + 2 + 4; + if (ret) + return TPM_LIB_ERROR; + + return tpm_sendrecv_command(command_v2, NULL, NULL); +} + +u32 tpm2_pcr_setauthvalue(const char *pw, const ssize_t pw_sz, u32 index, + const char *key, const ssize_t key_sz) +{ + u8 command_v2[COMMAND_BUFFER_SIZE] = { + tpm_u16(TPM2_ST_SESSIONS), /* TAG */ + tpm_u32(33 + pw_sz + TPM2_DIGEST_LEN), /* Length */ + tpm_u32(TPM2_CC_PCR_SETAUTHVAL), /* Command code */ + + /* HANDLE */ + tpm_u32(index), /* Handle (PCR Index) */ + + /* AUTH_SESSION */ + tpm_u32(9 + pw_sz), /* Authorization size */ + tpm_u32(TPM2_RS_PW), /* session handle */ + tpm_u16(0), /* Size of <nonce> */ + /* <nonce> (if any) */ + 0, /* Attributes: Cont/Excl/Rst */ + tpm_u16(pw_sz), /* Size of <hmac/password> */ + /* STRING(pw) <hmac/password> (if any) */ + + /* TPM2B_DIGEST */ + /* tpm_u16(key_sz) Key length */ + /* STRING(key) Key */ + }; + unsigned int offset = 27; + int ret; + + /* + * Fill the command structure starting from the first buffer: + * - the password (if any) + * - the number of digests, 1 in our case + * - the algorithm, sha256 in our case + * - the digest (64 bytes) + */ + ret = pack_byte_string(command_v2, sizeof(command_v2), "sws", + offset, pw, pw_sz, + offset + pw_sz, key_sz, + offset + pw_sz + 2, key, key_sz); + offset += pw_sz + 2 + key_sz; + if (ret) + return TPM_LIB_ERROR; + + return tpm_sendrecv_command(command_v2, NULL, NULL); +} |