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PSA_CIPHER_ENCRYPT_OUTPUT_SIZE macro
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(\p input_length). \warning This macro may evaluate its arguments multiple times or zero times, so you should not pass arguments that contain side effects.
Syntax
#define PSA_CIPHER_ENCRYPT_OUTPUT_SIZE(key_type, alg, input_length) \
(alg == PSA_ALG_CBC_PKCS7 ? \
(PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type) != 0 ? \
PSA_ROUND_UP_TO_MULTIPLE(PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type), \
(input_length) + 1) + \
PSA_CIPHER_IV_LENGTH((key_type), (alg)) : 0) : \
(PSA_ALG_IS_CIPHER(alg) ? \
(input_length) + PSA_CIPHER_IV_LENGTH((key_type), (alg)) : \
0))
Return value
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.