From: Lennart Poettering <lennart@poettering.net>
Date: Mon, 23 Oct 2023 20:36:09 +0000 (+0200)
Subject: tpm2-util: add common array for TPM2 hash algorithms
X-Git-Tag: v255-rc1~27^2~7
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b52e9505983760628d73e6d87ce5d6393c260827;p=thirdparty%2Fsystemd.git

tpm2-util: add common array for TPM2 hash algorithms

This is useful to enumerate all hash algorithms we want to predict
measurements for.
---

diff --git a/src/shared/tpm2-util.c b/src/shared/tpm2-util.c
index 5373fa12a59..bdb10cb4fb4 100644
--- a/src/shared/tpm2-util.c
+++ b/src/shared/tpm2-util.c
@@ -5419,6 +5419,16 @@ int tpm2_extend_bytes(
 }
 #endif
 
+const uint16_t tpm2_hash_algorithms[] = {
+        TPM2_ALG_SHA1,
+        TPM2_ALG_SHA256,
+        TPM2_ALG_SHA384,
+        TPM2_ALG_SHA512,
+        0,
+};
+
+assert_cc(ELEMENTSOF(tpm2_hash_algorithms) == TPM2_N_HASH_ALGORITHMS + 1);
+
 char *tpm2_pcr_mask_to_string(uint32_t mask) {
         _cleanup_free_ char *s = NULL;
 
diff --git a/src/shared/tpm2-util.h b/src/shared/tpm2-util.h
index 20121222dd7..9969ba09810 100644
--- a/src/shared/tpm2-util.h
+++ b/src/shared/tpm2-util.h
@@ -37,6 +37,8 @@ static inline bool TPM2_PCR_MASK_VALID(uint32_t pcr_mask) {
 
 #define FOREACH_PCR_IN_MASK(pcr, mask) BIT_FOREACH(pcr, mask)
 
+#define TPM2_N_HASH_ALGORITHMS 4U
+
 #if HAVE_TPM2
 
 #include <tss2/tss2_esys.h>
@@ -353,6 +355,8 @@ int tpm2_asym_alg_from_string(const char *alg) _pure_;
 
 char *tpm2_pcr_mask_to_string(uint32_t mask);
 
+extern const uint16_t tpm2_hash_algorithms[];
+
 typedef struct {
         uint32_t search_pcr_mask;
         const char *device;