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Commit c27b2d2012 ("crypto: testmgr - allow ecdsa-nist-p256 and -p384
in FIPS mode") enabled support for ECDSA in crypto/testmgr.c. The
PKCS#7 signature verification API builds upon the KCAPI primitives to
perform its high-level operations. Therefore, this change in testmgr.c
also allows ECDSA to be used by the PKCS#7 signature verification API
(in FIPS mode).
However, from a FIPS perspective, the PKCS#7 signature verification API
is a distinct "service" from the KCAPI primitives. This is because the
PKCS#7 API performs a "full" signature verification, which consists of
both hashing the data to be verified, and the public key operation.
On the other hand, the KCAPI primitive does not perform this hashing
step - it accepts pre-hashed data from the caller and only performs the
public key operation.
For this reason, the ECDSA self-tests in crypto/testmgr.c are not
sufficient to cover ECDSA signature verification offered by the PKCS#7
API. This is reflected by the self-test already present in this file
for RSA PKCS#1 v1.5 signature verification.
The solution is simply to add a second self-test here for ECDSA. P-256
with SHA-256 hashing was chosen as those parameters should remain
FIPS-approved for the foreseeable future, while keeping the performance
impact to a minimum. The ECDSA certificate and PKCS#7 signed data was
generated using OpenSSL. The input data is identical to the input data
for the existing RSA self-test.
Signed-off-by: Joachim Vandersmissen <git@jvdsn.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
23 lines
692 B
C
23 lines
692 B
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* Helper function for self-testing PKCS#7 signature verification.
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*
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* Copyright (C) 2024 Joachim Vandersmissen <git@jvdsn.com>
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*/
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void fips_signature_selftest(const char *name,
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const u8 *keys, size_t keys_len,
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const u8 *data, size_t data_len,
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const u8 *sig, size_t sig_len);
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#ifdef CONFIG_FIPS_SIGNATURE_SELFTEST_RSA
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void __init fips_signature_selftest_rsa(void);
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#else
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static inline void __init fips_signature_selftest_rsa(void) { }
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#endif
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#ifdef CONFIG_FIPS_SIGNATURE_SELFTEST_ECDSA
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void __init fips_signature_selftest_ecdsa(void);
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#else
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static inline void __init fips_signature_selftest_ecdsa(void) { }
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#endif
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