File libica-sles15sp2-FIPS-provide-output-iv-as-requ... of Package libica

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File libica-sles15sp2-FIPS-provide-output-iv-as-required-by-FIPS-tests.patch of Package libica

From b687f1514b3d371cdc44b5b3b02d5ddd9ac4eb54 Mon Sep 17 00:00:00 2001
From: Joerg Schmidbauer <jschmidb@de.ibm.com>
Date: Wed, 25 Mar 2020 10:07:10 +0100
Subject: [PATCH] FIPS: provide output iv as required by FIPS tests

This fix is introduced to satisfy FIPS tests. They require the
output iv to be the iv resulting from decrypting the last block
with a zero iv as input. But note that this is not described
in the NIST standard for CBC-CS. According to the standard,
the output iv is simply undefined.

Signed-off-by: Joerg Schmidbauer <jschmidb@de.ibm.com>
---
 src/include/s390_cbccs.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/include/s390_cbccs.h b/src/include/s390_cbccs.h
index aa29bff..f6626dc 100644
--- a/src/include/s390_cbccs.h
+++ b/src/include/s390_cbccs.h
@@ -287,6 +287,17 @@ s390_aes_cbccs_dec(unsigned int fc, const unsigned char *in_data,
 	block_xor(out_data + tmp_data_length + AES_BLOCK_SIZE,
 		  tmp_in_data, tmp_out_data, rest_data_length);
 
+	/*
+	 * This fix was introduced to satisfy FIPS tests. They require the
+	 * output iv to be the iv resulting from decrypting the last block
+	 * with a zero iv as input, which is tmp_iv here. But note that this
+	 * is not described in the NIST standard for CBC-CS. According to the
+	 * standard, the output iv is simply undefined.
+	 */
+#ifdef ICA_FIPS
+	memcpy(iv, tmp_iv, AES_BLOCK_SIZE);
+#endif /* ICA_FIPS */
+
 	return 0;
 }
 
-- 
2.16.4

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File libica-sles15sp2-FIPS-provide-output-iv-as-required-by-FIPS-tests.patch of Package libica

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