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Add macros for output buffer sizes

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Signed-off-by: gabor-mezei-arm <gabor.mezei@arm.com>
This commit is contained in:
gabor-mezei-arm 2020-05-06 16:05:37 +02:00
parent a200ee6098
commit 0687b2b236
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1 changed files with 50 additions and 0 deletions
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50
include/psa/crypto_sizes.h
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@ -141,6 +141,13 @@
(((alg) & PSA_ALG_AEAD_TAG_LENGTH_MASK) >> PSA_AEAD_TAG_LENGTH_OFFSET) : \
0)
/** The maximum tag size for all supported AEAD algorithms, in bytes.
*
* See also #PSA_AEAD_TAG_LENGTH(\p alg).
*/
#define PSA_AEAD_TAG_MAX_SIZE \
(PSA_ALG_AEAD_TAG_LENGTH_MASK >> PSA_AEAD_TAG_LENGTH_OFFSET)
/* The maximum size of an RSA key on this implementation, in bits.
* This is a vendor-specific macro.
*
@ -259,6 +266,24 @@
(plaintext_length) + PSA_AEAD_TAG_LENGTH(alg) : \
0)
/** A sufficient output buffer size for psa_aead_encrypt(), for any of the
* supported key types and AEAD algorithms.
*
* If the size of the ciphertext buffer is at least this large, it is guaranteed
* that psa_aead_encrypt() will not fail due to an insufficient buffer size.
*
* See also #PSA_AEAD_ENCRYPT_OUTPUT_SIZE(\p alg, \p plaintext_length).
*
* \param plaintext_length Size of the plaintext in bytes.
*
* \return A sufficient output buffer size for any of the
* supported key types and AEAD algorithms.
*
*/
#define PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE(plaintext_length) \
((plaintext_length) + PSA_AEAD_TAG_MAX_SIZE)
/** The maximum size of the output of psa_aead_decrypt(), in bytes.
*
* If the size of the plaintext buffer is at least this large, it is
@ -283,6 +308,23 @@
(ciphertext_length) - PSA_AEAD_TAG_LENGTH(alg) : \
0)
/** A sufficient output buffer size for psa_aead_decrypt(), for any of the
* supported key types and AEAD algorithms.
*
* If the size of the plaintext buffer is at least this large, it is guaranteed
* that psa_aead_decrypt() will not fail due to an insufficient buffer size.
*
* See also #PSA_AEAD_DECRYPT_OUTPUT_SIZE(\p alg, \p ciphertext_length).
*
* \param ciphertext_length Size of the ciphertext in bytes.
*
* \return A sufficient output buffer size for any of the
* supported key types and AEAD algorithms.
*
*/
#define PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE(ciphertext_length) \
(ciphertext_length)
/** The default nonce size for an AEAD algorithm, in bytes.
*
* This macro can be used to allocate a buffer of sufficient size to
@ -382,6 +424,14 @@
PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE : \
0)
/** A sufficient ciphertext buffer size for psa_aead_finish(), for any of the
* supported key types and AEAD algorithms.
*
* See also #PSA_AEAD_FINISH_OUTPUT_SIZE(\p alg).
*/
#define PSA_AEAD_FINISH_OUTPUT_MAX_SIZE (PSA_MAX_BLOCK_CIPHER_BLOCK_SIZE)
/** A sufficient plaintext buffer size for psa_aead_verify().
*
* If the size of the plaintext buffer is at least this large, it is