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Add and update size macros for ciphers and keys

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Signed-off-by: gabor-mezei-arm <gabor.mezei@arm.com>
This commit is contained in:
gabor-mezei-arm 2020-06-02 14:27:06 +02:00
parent 0687b2b236
commit 8809fb64eb
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GPG Key ID: 106F5A41ECC305BD
2 changed files with 59 additions and 0 deletions
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56
include/psa/crypto_sizes.h
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@ -785,4 +785,60 @@
*/
#define PSA_CIPHER_IV_MAX_SIZE 16
/** The maximum size of the output of psa_cipher_encrypt(), in bytes.
*
* If the size of the output buffer is at least this large, it is guaranteed
* that psa_cipher_encrypt() will not fail due to an insufficient buffer size.
* Depending on the algorithm, the actual size of the output might be smaller.
*
* See also #PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE.
*
* \param key_type A symmetric key type that is compatible with algorithm
* alg.
* \param alg A cipher algorithm (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_CIPHER(\p alg) is true).
* \param input_length Size of the input in bytes.
*
* \return A sufficient output size for the specified key type and
* algorithm. If the key type or cipher algorithm is not
* recognized, or the parameters are incompatible,
* return 0. An implementation can return either 0 or
* a correct size for a key type and cipher algorithm
* that it recognizes, but does not support.
*/
#define PSA_CIPHER_ENCRYPT_OUTPUT_SIZE(key_type, alg, input_length) \
(PSA_ALG_IS_CIPHER(alg) && PSA_KEY_TYPE_IS_SYMMETRIC(key_type) ? \
(alg == PSA_ALG_CBC_PKCS7 ? \
(((input_length) + PSA_CIPHER_IV_LENGTH(key_type, alg) + 1) / \
PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type) + 1) * \
PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type) : \
(input_length) + PSA_CIPHER_IV_LENGTH(key_type, alg) ) : \
0)
/** The maximum size of the output of psa_cipher_decrypt(), in bytes.
*
* If the size of the output buffer is at least this large, it is guaranteed
* that psa_cipher_decrypt() will not fail due to an insufficient buffer size.
* Depending on the algorithm, the actual size of the output might be smaller.
*
* See also #PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE.
*
* \param key_type A symmetric key type that is compatible with algorithm
* alg.
* \param alg A cipher algorithm (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_CIPHER(\p alg) is true).
* \param input_length Size of the input in bytes.
*
* \return A sufficient output size for the specified key type and
* algorithm. If the key type or cipher algorithm is not
* recognized, or the parameters are incompatible,
* return 0. An implementation can return either 0 or
* a correct size for a key type and cipher algorithm
* that it recognizes, but does not support.
*/
#define PSA_CIPHER_DECRYPT_OUTPUT_SIZE(key_type, alg, input_length) \
(PSA_ALG_IS_CIPHER(alg) && PSA_KEY_TYPE_IS_SYMMETRIC(key_type) ? \
(input_length) : \
0)
#endif /* PSA_CRYPTO_SIZES_H */

3
include/psa/crypto_values.h
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@ -354,6 +354,9 @@
(((type) & PSA_KEY_TYPE_CATEGORY_MASK) == PSA_KEY_TYPE_CATEGORY_RAW || \
((type) & PSA_KEY_TYPE_CATEGORY_MASK) == PSA_KEY_TYPE_CATEGORY_SYMMETRIC)
/** Whether a key type is symmetric. */
#define PSA_KEY_TYPE_IS_SYMMETRIC(type) \
(((type) & PSA_KEY_TYPE_CATEGORY_MASK) == PSA_KEY_TYPE_CATEGORY_SYMMETRIC)
/** Whether a key type is asymmetric: either a key pair or a public key. */
#define PSA_KEY_TYPE_IS_ASYMMETRIC(type) \
(((type) & PSA_KEY_TYPE_CATEGORY_MASK \