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| author | Stefan Berger <stefanb@linux.ibm.com> | 2024-04-04 16:18:49 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2024-04-12 09:07:52 +0200 |
| commit | e7fb062754ef9f656ee004f2be8f59ce8a79bffb (patch) | |
| tree | 1f93573ef86eb6e7133dd14d5e6e90ceb94f3fa7 /include | |
| parent | crypto: ecc - Add nbits field to ecc_curve structure (diff) | |
| download | linux-e7fb062754ef9f656ee004f2be8f59ce8a79bffb.tar.xz linux-e7fb062754ef9f656ee004f2be8f59ce8a79bffb.zip | |
crypto: ecc - Implement vli_mmod_fast_521 for NIST p521
Implement vli_mmod_fast_521 following the description for how to calculate
the modulus for NIST P521 in the NIST publication "Recommendations for
Discrete Logarithm-Based Cryptography: Elliptic Curve Domain Parameters"
section G.1.4.
NIST p521 requires 9 64bit digits, so increase the ECC_MAX_DIGITS so that
the vli digit array provides enough elements to fit the larger integers
required by this curve.
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/crypto/internal/ecc.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/crypto/internal/ecc.h b/include/crypto/internal/ecc.h index ab722a8986b7..4e2f5f938e91 100644 --- a/include/crypto/internal/ecc.h +++ b/include/crypto/internal/ecc.h @@ -33,7 +33,8 @@ #define ECC_CURVE_NIST_P192_DIGITS 3 #define ECC_CURVE_NIST_P256_DIGITS 4 #define ECC_CURVE_NIST_P384_DIGITS 6 -#define ECC_MAX_DIGITS (512 / 64) /* due to ecrdsa */ +#define ECC_CURVE_NIST_P521_DIGITS 9 +#define ECC_MAX_DIGITS DIV_ROUND_UP(521, 64) /* NIST P521 */ #define ECC_DIGITS_TO_BYTES_SHIFT 3 |