Messages in this thread Patch in this message | | | From | Stefan Berger <> | Subject | [PATCH v4 06/12] crypto: ecc - Add special case for NIST P521 in ecc_point_mult | Date | Thu, 29 Feb 2024 21:20:01 -0500 |
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In ecc_point_mult use the number of bits of the NIST P521 curve + 2. The change is required specifically for NIST P521 to pass mathematical tests on the public key.
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com> --- crypto/ecc.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/crypto/ecc.c b/crypto/ecc.c index ea7b28b5e00e..3430c2c4e62c 100644 --- a/crypto/ecc.c +++ b/crypto/ecc.c @@ -1326,7 +1326,10 @@ static void ecc_point_mult(struct ecc_point *result, carry = vli_add(sk[0], scalar, curve->n, ndigits); vli_add(sk[1], sk[0], curve->n, ndigits); scalar = sk[!carry]; - num_bits = sizeof(u64) * ndigits * 8 + 1; + if (ndigits == 9 && !strcmp(curve->name, "nist_521")) + num_bits = curve->nbits + 2; + else + num_bits = sizeof(u64) * ndigits * 8 + 1; vli_set(rx[1], point->x, ndigits); vli_set(ry[1], point->y, ndigits); -- 2.43.0
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