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Signed-off-by: John Crispin <john@phrozen.org>
27 lines
1006 B
Diff
27 lines
1006 B
Diff
From 54211caa2e0e5163aefef390daf88a971367a702 Mon Sep 17 00:00:00 2001
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From: Glenn Strauss <gstrauss@gluelogic.com>
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Date: Tue, 4 Oct 2022 17:09:24 -0400
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Subject: [PATCH 6/7] dpp_pkex: EC point mul w/ value < prime
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crypto_ec_point_mul() with mbedtls requires point
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be multiplied by a multiplicand with value < prime
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Signed-off-by: Glenn Strauss <gstrauss@gluelogic.com>
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---
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src/common/dpp_crypto.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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--- a/src/common/dpp_crypto.c
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+++ b/src/common/dpp_crypto.c
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@@ -1588,7 +1588,9 @@ dpp_pkex_derive_Qr(const struct dpp_curv
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Pr = crypto_ec_key_get_public_key(Pr_key);
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Qr = crypto_ec_point_init(ec);
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hash_bn = crypto_bignum_init_set(hash, curve->hash_len);
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- if (!Pr || !Qr || !hash_bn || crypto_ec_point_mul(ec, Pr, hash_bn, Qr))
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+ if (!Pr || !Qr || !hash_bn ||
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+ crypto_bignum_mod(hash_bn, crypto_ec_get_prime(ec), hash_bn) ||
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+ crypto_ec_point_mul(ec, Pr, hash_bn, Qr))
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goto fail;
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if (crypto_ec_point_is_at_infinity(ec, Qr)) {
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