From 06bea4980980c05106944b0192f24700fe479f0b Mon Sep 17 00:00:00 2001 From: Dhananjay Phadke Date: Thu, 4 Jun 2020 16:43:59 -0700 Subject: tpm: add TPM2_GetRandom command support Add support for TPM2 GetRandom command Signed-off-by: Dhananjay Phadke Reviewed-by: Simon Glass --- lib/tpm-v2.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) (limited to 'lib/tpm-v2.c') diff --git a/lib/tpm-v2.c b/lib/tpm-v2.c index 5a039f65d1..a4c352e3ef 100644 --- a/lib/tpm-v2.c +++ b/lib/tpm-v2.c @@ -422,3 +422,47 @@ u32 tpm2_pcr_setauthvalue(struct udevice *dev, const char *pw, return tpm_sendrecv_command(dev, command_v2, NULL, NULL); } + +u32 tpm2_get_random(struct udevice *dev, void *data, u32 count) +{ + const u8 command_v2[10] = { + tpm_u16(TPM2_ST_NO_SESSIONS), + tpm_u32(12), + tpm_u32(TPM2_CC_GET_RANDOM), + }; + u8 buf[COMMAND_BUFFER_SIZE], response[COMMAND_BUFFER_SIZE]; + + const size_t data_size_offset = 10; + const size_t data_offset = 12; + size_t response_length = sizeof(response); + u32 data_size; + u8 *out = data; + + while (count > 0) { + u32 this_bytes = min((size_t)count, + sizeof(response) - data_offset); + u32 err; + + if (pack_byte_string(buf, sizeof(buf), "sw", + 0, command_v2, sizeof(command_v2), + sizeof(command_v2), this_bytes)) + return TPM_LIB_ERROR; + err = tpm_sendrecv_command(dev, buf, response, + &response_length); + if (err) + return err; + if (unpack_byte_string(response, response_length, "w", + data_size_offset, &data_size)) + return TPM_LIB_ERROR; + if (data_size > this_bytes) + return TPM_LIB_ERROR; + if (unpack_byte_string(response, response_length, "s", + data_offset, out, data_size)) + return TPM_LIB_ERROR; + + count -= data_size; + out += data_size; + } + + return 0; +} -- cgit