[PATCH v3 00/10] Add support for NIST P521 to ecdsa

Stefan Berger
2024-02-23T20:42:12Z

This series adds support for the NIST P521 curve to the ecdsa module.

An issue with the current code in ecdsa is that it assumes that input
arrays providing key coordinates for example, are arrays of digits
(a 'digit' is a 'u64'). This works well for all currently supported
curves, such as NIST P192/256/384, but does not work for NIST P521 where
coordinates are 8 digits + 2 bytes long. So some of the changes deal with
converting byte arrays to digits and adjusting tests on input byte
array lengths to tolerate arrays not providing multiples of 8 bytes.

Regards,
Stefan

v3:
- Dropped ecdh support
- Use ecc_get_curve_nbits for getting number of bits in NIST P521 curve
in ecc_point_mult (7/10)

v2:
- Reformulated some patch descriptions
- Fixed issue detected by krobot
- Some other small changes to the code

Stefan Berger (10):
crypto: ecdsa - Convert byte arrays with key coordinates to digits
crypto: ecdsa - Adjust tests on length of key parameters
crypto: ecdsa - Extend res.x mod n calculation for NIST P521
crypto: ecc - Implement vli_mmod_fast_521 for NIST p521
crypto: ecc - Add nbits field to ecc_curve structure
crypte: ecc - Implement ecc_curve_get_nbits to get number of bits
crypto: ecc - Use ecc_get_curve_nbits to get number of bits for NIST
P521
crypto: ecc - Add NIST P521 curve parameters
crypto: ecdsa - Register NIST P521 and extend test suite
x509: Add OID for NIST P521 and extend parser for it

crypto/asymmetric_keys/x509_cert_parser.c | 3 +
crypto/ecc.c | 38 +++++-
crypto/ecc_curve_defs.h | 45 +++++++
crypto/ecdsa.c | 48 +++++--
crypto/testmgr.c | 7 ++
crypto/testmgr.h | 146 ++++++++++++++++++++++
include/crypto/ecc_curve.h | 3 +
include/crypto/ecdh.h | 1 +
include/crypto/internal/ecc.h | 32 ++++-
include/linux/oid_registry.h | 1 +
10 files changed, 315 insertions(+), 9 deletions(-)

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2.43.0