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46 lines
1.5 KiB
46 lines
1.5 KiB
1 year ago
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From 7a56b84b5990b07efd30b5bf79331c74d28df954 Mon Sep 17 00:00:00 2001
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From: Imran Desai <imran.desai@intel.com>
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Date: Mon, 22 Mar 2021 16:43:36 -0700
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Subject: [PATCH 3/4] esys_iutil.c: Fix issue where nonceTPM was included twice
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in hmac
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Fixes #2037
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TPM2.0 Architecture 19.6.5 Note 7
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If the same session (not the first session) is used for decrypt and
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encrypt, its nonceTPM is only used once. If different sessions are
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used for decrypt and encrypt, both nonceTPMs are included.
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Signed-off-by: Imran Desai <imran.desai@intel.com>
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---
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src/tss2-esys/esys_iutil.c | 12 ++++++++++++
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1 file changed, 12 insertions(+)
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diff --git a/src/tss2-esys/esys_iutil.c b/src/tss2-esys/esys_iutil.c
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index 08a9b7df..1910c570 100644
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--- a/src/tss2-esys/esys_iutil.c
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+++ b/src/tss2-esys/esys_iutil.c
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@@ -1265,6 +1265,18 @@ iesys_gen_auths(ESYS_CONTEXT * esys_context,
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&encryptNonce);
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return_if_error(r, "More than one crypt session");
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+ /*
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+ * TPM2.0 Architecture 19.6.5 Note 7
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+ *
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+ * If the same session (not the first session) is used for decrypt and
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+ * encrypt, its nonceTPM is only used once. If different sessions are used
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+ * for decrypt and encrypt, both nonceTPMs are included
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+ */
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+ if (decryptNonceIdx && (decryptNonceIdx == encryptNonceIdx)) {
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+ decryptNonceIdx = 0;
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+ }
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+
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+
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/* Compute cp hash values for command buffer for all used algorithms */
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r = iesys_compute_cp_hashtab(esys_context,
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--
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2.41.0
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