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Private EC key format: update key representation size macro

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This commit is contained in:
Gilles Peskine 2018-10-31 13:24:35 +01:00
parent 2257649ce4
commit 5eb1521957
1 changed files with 2 additions and 15 deletions
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17
include/psa/crypto_sizes.h
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@ -437,23 +437,10 @@
/* Maximum size of the export encoding of an ECC key pair.
*
* ECPrivateKey ::= SEQUENCE {
* version INTEGER, -- must be 1
* privateKey OCTET STRING,
* -- `ceiling(log2(n)/8)`-byte string, big endian,
* -- where n is the order of the curve.
* parameters [0] IMPLICIT ECParameters {{ NamedCurve }},
* publicKey [1] IMPLICIT BIT STRING
* }
*
* - 4 bytes of SEQUENCE overhead;
* - 1 * point size in privateKey
* - 1 + 1 + 12 bytes of namedCurve OID;
* - 4 bytes of BIT STRING overhead;
* - public key as for #PSA_KEY_EXPORT_ECC_PUBLIC_KEY_MAX_SIZE.
* An ECC key pair is represented by the secret value.
*/
#define PSA_KEY_EXPORT_ECC_KEYPAIR_MAX_SIZE(key_bits) \
(3 * PSA_BITS_TO_BYTES(key_bits) + 56)
(PSA_BITS_TO_BYTES(key_bits))
/** Safe output buffer size for psa_export_key() or psa_export_public_key().
*