From 114e80437e0e48b967d0bd533a4c8ff1186ce12f Mon Sep 17 00:00:00 2001 From: Stefan Berger <stefanb@linux.ibm.com> Date: Thu, 4 Apr 2024 10:18:50 -0400 Subject: crypto: ecc - Add special case for NIST P521 in ecc_point_mult 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. Tested-by: Lukas Wunner <lukas@wunner.de> Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> --- crypto/ecc.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'crypto/ecc.c') diff --git a/crypto/ecc.c b/crypto/ecc.c index 8914e437f94b..d15ef0747a76 100644 --- a/crypto/ecc.c +++ b/crypto/ecc.c @@ -1320,7 +1320,10 @@ 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 (curve->nbits == 521) /* NIST P521 */ + 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); -- cgit v1.2.3