1 /* SPDX-License-Identifier: BSD-2-Clause */ 2 /***********************************************************************; 3 * Copyright (c) 2015 - 2018, Intel Corporation 4 * All rights reserved. 5 ***********************************************************************/ 6 7 #ifdef HAVE_CONFIG_H 8 #include <config.h> 9 #endif 10 11 #include "tss2_tpm2_types.h" 12 #include "tss2_mu.h" 13 #include "sysapi_util.h" 14 #include "util/tss2_endian.h" 15 Tss2_Sys_GetDecryptParam(TSS2_SYS_CONTEXT * sysContext,size_t * decryptParamSize,const uint8_t ** decryptParamBuffer)16TSS2_RC Tss2_Sys_GetDecryptParam( 17 TSS2_SYS_CONTEXT *sysContext, 18 size_t *decryptParamSize, 19 const uint8_t **decryptParamBuffer) 20 { 21 _TSS2_SYS_CONTEXT_BLOB *ctx = syscontext_cast(sysContext); 22 TPM2B *decryptParam; 23 24 if (!decryptParamSize || !decryptParamBuffer || !ctx) 25 return TSS2_SYS_RC_BAD_REFERENCE; 26 27 if (ctx->previousStage != CMD_STAGE_PREPARE) 28 return TSS2_SYS_RC_BAD_SEQUENCE; 29 30 if (ctx->decryptAllowed == 0) 31 return TSS2_SYS_RC_NO_DECRYPT_PARAM; 32 33 /* Get first parameter and return its size and a pointer to it. */ 34 decryptParam = (TPM2B *)(ctx->cpBuffer); 35 *decryptParamSize = BE_TO_HOST_16(decryptParam->size); 36 *decryptParamBuffer = decryptParam->buffer; 37 38 return TSS2_RC_SUCCESS; 39 } 40