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PSA crypto: PSA_ASYMMETRIC_SIGN_OUTPUT_SIZE macro

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Test it for RSA.
This commit is contained in:
Gilles Peskine
2018-02-03 23:57:22 +01:00
committed by itayzafrir
parent 20035e3579
commit 0189e7512d
3 changed files with 86 additions and 4 deletions
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45
include/psa/crypto.h
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@ -103,6 +103,9 @@ typedef enum {
*/
psa_status_t psa_crypto_init(void);
#define BITS_TO_BYTES(bits) (((bits) + 7) / 8)
#define BYTES_TO_BITS(bytes) ((bytes) * 8)
/**@}*/
/** \defgroup crypto_types Key and algorithm types
@ -122,7 +125,8 @@ typedef uint32_t psa_key_type_t;
#define PSA_KEY_TYPE_ASYMMETRIC_MASK 0x60000000
#define PSA_KEY_TYPE_ASYMMETRIC_MASK_PUBLIC 0x40000000
#define PSA_KEY_TYPE_ASYMMETRIC_MASK_KEYPAIR 0x60000000
#define PSA_KEY_TYPE_ECC_TEST_MASK 0x7fff0000
#define PSA_KEY_TYPE_ASYMMETRIC_TEST_MASK 0x5fff0000
#define PSA_KEY_TYPE_RSA_TEST_VALUE 0x40000000
#define PSA_KEY_TYPE_ECC_TEST_VALUE 0x40010000
#define PSA_KEY_TYPE_IS_VENDOR(type) \
@ -133,8 +137,10 @@ typedef uint32_t psa_key_type_t;
(((type) & PSA_KEY_TYPE_ASYMMETRIC_MASK) == PSA_KEY_TYPE_ASYMMETRIC_MASK_PUBLIC)
#define PSA_KEY_TYPE_IS_KEYPAIR(type) \
(((type) & PSA_KEY_TYPE_ASYMMETRIC_MASK) == PSA_KEY_TYPE_ASYMMETRIC_MASK_KEYPAIR)
#define PSA_KEY_TYPE_IS_RSA(type) \
(((type) & PSA_KEY_TYPE_ASYMMETRIC_TEST_MASK) == PSA_KEY_TYPE_RSA_TEST_VALUE)
#define PSA_KEY_TYPE_IS_ECC(type) \
(((type) & PSA_KEY_TYPE_ECC_TEST_MASK) == PSA_KEY_TYPE_ECC_TEST_VALUE)
(((type) & PSA_KEY_TYPE_ASYMMETRIC_TEST_MASK) == PSA_KEY_TYPE_ECC_TEST_VALUE)
typedef uint32_t psa_algorithm_t;
@ -247,6 +253,41 @@ psa_status_t psa_export_key(psa_key_slot_t key,
* @{
*/
/**
* \brief Maximum ECDSA signature size for a given curve bit size
*
* \param curve_bits Curve size in bits
* \return Maximum signature size in bytes
*
* \note This macro returns a compile-time constant if its argument is one.
*
* \warning This macro may evaluate its argument multiple times.
*/
/*
* RFC 4492 page 20:
*
* Ecdsa-Sig-Value ::= SEQUENCE {
* r INTEGER,
* s INTEGER
* }
*
* Size is at most
* 1 (tag) + 1 (len) + 1 (initial 0) + curve_bytes for each of r and s,
* twice that + 1 (tag) + 2 (len) for the sequence
* (assuming curve_bytes is less than 126 for r and s,
* and less than 124 (total len <= 255) for the sequence)
*/
#define PSA_ECDSA_SIGNATURE_SIZE(curve_bits) \
( /*T,L of SEQUENCE*/ ((curve_bits) >= 61 * 8 ? 3 : 2) + \
/*T,L of r,s*/ 2 * (((curve_bits) >= 127 * 8 ? 3 : 2) + \
/*V of r,s*/ ((curve_bits) + 8) / 8))
#define PSA_ASYMMETRIC_SIGN_OUTPUT_SIZE(key_type, key_bits, alg) \
(PSA_KEY_TYPE_IS_RSA(key_type) ? ((void)alg, BITS_TO_BYTES(key_bits)) : \
PSA_KEY_TYPE_IS_ECC(key_type) ? PSA_ECDSA_SIGNATURE_SIZE(key_bits) : \
0)
/**
* \brief Sign a hash or short message with a private key.
*