Asymmetric signature size definitions for the PSA Crypto API. More...

Detailed Description

Asymmetric signature size definitions for the PSA Crypto API.

Author: Armin Wolf wolf..nosp@m.armi.nosp@m.n@mai.nosp@m.lbox.nosp@m..tu-d.nosp@m.resd.nosp@m.en.de; Lena Boeckmann lena..nosp@m.boec.nosp@m.kmann.nosp@m.@haw.nosp@m.-hamb.nosp@m.urg..nosp@m.de

Definition in file sizes.h.

#include "psa/sizes.h"
#include "psa/key/type.h"

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#define	PSA_SIGNATURE_MAX_SIZE /* implementation-defined value */
	A sufficient signature buffer size for psa_sign_message() and psa_sign_hash(), for any of the supported key types and asymmetric signature algorithms.

#define	PSA_ECDSA_SIGNATURE_SIZE(curve_bits)
	ECDSA signature size for a given curve bit size.

#define	PSA_SIGN_OUTPUT_SIZE(key_type, key_bits, alg)
	Sufficient signature buffer size for psa_sign_message() and psa_sign_hash().

Macro Definition Documentation

◆ PSA_ECDSA_SIGNATURE_SIZE

#define PSA_ECDSA_SIGNATURE_SIZE ( curve_bits )

Value:

((size_t)(PSA_BITS_TO_BYTES(curve_bits) * 2))

PSA_BITS_TO_BYTES

#define PSA_BITS_TO_BYTES(bits)

Functions to convert bits to bytes.

Definition sizes.h:35

ECDSA signature size for a given curve bit size.

Note: This macro returns a compile-time constant if its argument is one.

Parameters

curve_bits Curve size in bits.

Returns: Signature size in bytes.

Definition at line 53 of file sizes.h.

◆ PSA_SIGN_OUTPUT_SIZE

#define PSA_SIGN_OUTPUT_SIZE	(	key_type,
		key_bits,
		alg )

Value:

(PSA_KEY_TYPE_IS_ECC(key_type) ? PSA_ECDSA_SIGNATURE_SIZE(key_bits) : \

((void)alg, 0))

PSA_ECDSA_SIGNATURE_SIZE

#define PSA_ECDSA_SIGNATURE_SIZE(curve_bits)

ECDSA signature size for a given curve bit size.

Definition sizes.h:53

PSA_KEY_TYPE_IS_ECC

#define PSA_KEY_TYPE_IS_ECC(type)

Whether a key type is an elliptic curve key, either a key pair or a public key.

Definition type.h:743

Sufficient signature buffer size for psa_sign_message() and psa_sign_hash().

If the size of the signature buffer is at least this large, it is guaranteed that psa_sign_message() and psa_sign_hash() will not fail due to an insufficient buffer size. The actual size of the output might be smaller in any given call.

◆ PSA_SIGNATURE_MAX_SIZE

#define PSA_SIGNATURE_MAX_SIZE /* implementation-defined value */

A sufficient signature buffer size for psa_sign_message() and psa_sign_hash(), for any of the supported key types and asymmetric signature algorithms.

If the size of the signature buffer is at least this large, it is guaranteed that psa_sign_message() and psa_sign_hash() will not fail due to an insufficient buffer size.

key_type	An asymmetric key type. This can be a key pair type or a public key type.
key_bits	The size of the key in bits.
alg	The signature algorithm.