Re: [PATCH v6 08/13] crypto: ecc - Add NIST P521 curve parameters

[Jarkko Sakkinen]

On Tue Mar 12, 2024 at 8:36 PM EET, Stefan Berger wrote:
> From: Stefan Berger <stefanb@xxxxxxxxxxxxx>
>
> Add the parameters for the NIST P521 curve and define a new curve ID
> for it. Make the curve available in ecc_get_curve.

This is rare example of "complete story" in this series despite being
short, so no complains :-)

>
> Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
> Tested-by: Lukas Wunner <lukas@xxxxxxxxx>
> ---
>  crypto/ecc.c            |  2 ++
>  crypto/ecc_curve_defs.h | 45 +++++++++++++++++++++++++++++++++++++++++
>  include/crypto/ecdh.h   |  1 +
>  3 files changed, 48 insertions(+)
>
> diff --git a/crypto/ecc.c b/crypto/ecc.c
> index ead40b5ebb46..4f6fa8617308 100644
> --- a/crypto/ecc.c
> +++ b/crypto/ecc.c
> @@ -60,6 +60,8 @@ const struct ecc_curve *ecc_get_curve(unsigned int curve_id)
>  		return &nist_p256;
>  	case ECC_CURVE_NIST_P384:
>  		return &nist_p384;
> +	case ECC_CURVE_NIST_P521:
> +		return &nist_p521;
>  	default:
>  		return NULL;
>  	}
> diff --git a/crypto/ecc_curve_defs.h b/crypto/ecc_curve_defs.h
> index ab1ef3d94be5..0ecade7d02f5 100644
> --- a/crypto/ecc_curve_defs.h
> +++ b/crypto/ecc_curve_defs.h
> @@ -89,6 +89,51 @@ static struct ecc_curve nist_p384 = {
>  	.b = nist_p384_b
>  };
>  
> +/* NIST P-521 */
> +static u64 nist_p521_g_x[] = { 0xf97e7e31c2e5bd66ull, 0x3348b3c1856a429bull,
> +				0xfe1dc127a2ffa8deull, 0xa14b5e77efe75928ull,
> +				0xf828af606b4d3dbaull, 0x9c648139053fb521ull,
> +				0x9e3ecb662395b442ull, 0x858e06b70404e9cdull,
> +				0xc6ull };
> +static u64 nist_p521_g_y[] = { 0x88be94769fd16650ull, 0x353c7086a272c240ull,
> +				0xc550b9013fad0761ull, 0x97ee72995ef42640ull,
> +				0x17afbd17273e662cull, 0x98f54449579b4468ull,
> +				0x5c8a5fb42c7d1bd9ull, 0x39296a789a3bc004ull,
> +				0x118ull };
> +static u64 nist_p521_p[] = { 0xffffffffffffffffull, 0xffffffffffffffffull,
> +				0xffffffffffffffffull, 0xffffffffffffffffull,
> +				0xffffffffffffffffull, 0xffffffffffffffffull,
> +				0xffffffffffffffffull, 0xffffffffffffffffull,
> +				0x1ffull };
> +static u64 nist_p521_n[] = { 0xbb6fb71e91386409ull, 0x3bb5c9b8899c47aeull,
> +				0x7fcc0148f709a5d0ull, 0x51868783bf2f966bull,
> +				0xfffffffffffffffaull, 0xffffffffffffffffull,
> +				0xffffffffffffffffull, 0xffffffffffffffffull,
> +				0x1ffull };
> +static u64 nist_p521_a[] = { 0xfffffffffffffffcull, 0xffffffffffffffffull,
> +				0xffffffffffffffffull, 0xffffffffffffffffull,
> +				0xffffffffffffffffull, 0xffffffffffffffffull,
> +				0xffffffffffffffffull, 0xffffffffffffffffull,
> +				0x1ffull };
> +static u64 nist_p521_b[] = { 0xef451fd46b503f00ull, 0x3573df883d2c34f1ull,
> +				0x1652c0bd3bb1bf07ull, 0x56193951ec7e937bull,
> +				0xb8b489918ef109e1ull, 0xa2da725b99b315f3ull,
> +				0x929a21a0b68540eeull, 0x953eb9618e1c9a1full,
> +				0x051ull };
> +static struct ecc_curve nist_p521 = {
> +	.name = "nist_521",
> +	.nbits = 521,
> +	.g = {
> +		.x = nist_p521_g_x,
> +		.y = nist_p521_g_y,
> +		.ndigits = 9,
> +	},
> +	.p = nist_p521_p,
> +	.n = nist_p521_n,
> +	.a = nist_p521_a,
> +	.b = nist_p521_b
> +};
> +
>  /* curve25519 */
>  static u64 curve25519_g_x[] = { 0x0000000000000009, 0x0000000000000000,
>  				0x0000000000000000, 0x0000000000000000 };
> diff --git a/include/crypto/ecdh.h b/include/crypto/ecdh.h
> index a9f98078d29c..9784ecdd2fb4 100644
> --- a/include/crypto/ecdh.h
> +++ b/include/crypto/ecdh.h
> @@ -26,6 +26,7 @@
>  #define ECC_CURVE_NIST_P192	0x0001
>  #define ECC_CURVE_NIST_P256	0x0002
>  #define ECC_CURVE_NIST_P384	0x0003
> +#define ECC_CURVE_NIST_P521	0x0004
>  
>  /**
>   * struct ecdh - define an ECDH private key


Reviewed-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>

BR, Jarkko