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Fix ECDSA case in PSA_ASYMMETRIC_SIGNATURE_MAX_SIZE

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PSA_ASYMMETRIC_SIGNATURE_MAX_SIZE was taking the maximum ECDSA key
size as the ECDSA signature size. Fix it to use the actual maximum
size of an ECDSA signature.
This commit is contained in:
Gilles Peskine 2019-11-08 15:49:40 +01:00
parent f48d6f2320
commit 2975571ff5
1 changed files with 16 additions and 15 deletions
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31
include/psa/crypto_sizes.h
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@ -247,21 +247,6 @@
*/
#define PSA_ALG_TLS12_PSK_TO_MS_MAX_PSK_LEN 128
/** \def PSA_ASYMMETRIC_SIGNATURE_MAX_SIZE
*
* Maximum size of an asymmetric signature.
*
* This macro must expand to a compile-time constant integer. This value
* should be the maximum size of a MAC supported by the implementation,
* in bytes, and must be no smaller than this maximum.
*/
#define PSA_ASYMMETRIC_SIGNATURE_MAX_SIZE \
PSA_BITS_TO_BYTES( \
PSA_VENDOR_RSA_MAX_KEY_BITS > PSA_VENDOR_ECC_MAX_CURVE_BITS ? \
PSA_VENDOR_RSA_MAX_KEY_BITS : \
PSA_VENDOR_ECC_MAX_CURVE_BITS \
)
/** The maximum size of a block cipher supported by the implementation. */
#define PSA_MAX_BLOCK_CIPHER_BLOCK_SIZE 16
@ -457,6 +442,22 @@
PSA_KEY_TYPE_IS_ECC(key_type) ? PSA_ECDSA_SIGNATURE_SIZE(key_bits) : \
((void)alg, 0))
#define PSA_VENDOR_ECDSA_SIGNATURE_MAX_SIZE \
PSA_ECDSA_SIGNATURE_SIZE(PSA_VENDOR_ECC_MAX_CURVE_BITS)
/** \def PSA_ASYMMETRIC_SIGNATURE_MAX_SIZE
*
* Maximum size of an asymmetric signature.
*
* This macro must expand to a compile-time constant integer. This value
* should be the maximum size of a signature supported by the implementation,
* in bytes, and must be no smaller than this maximum.
*/
#define PSA_ASYMMETRIC_SIGNATURE_MAX_SIZE \
(PSA_BITS_TO_BYTES(PSA_VENDOR_RSA_MAX_KEY_BITS) > PSA_VENDOR_ECDSA_SIGNATURE_MAX_SIZE ? \
PSA_BITS_TO_BYTES(PSA_VENDOR_RSA_MAX_KEY_BITS) : \
PSA_VENDOR_ECDSA_SIGNATURE_MAX_SIZE)
/** Sufficient output buffer size for psa_asymmetric_encrypt().
*
* This macro returns a sufficient buffer size for a ciphertext produced using