PSA_CIPHER_FINISH_OUTPUT_SIZE macro

A sufficient ciphertext buffer size for psa_cipher_finish(). If the size of the ciphertext buffer is at least this large, it is guaranteed that psa_cipher_finish() will not fail due to an insufficient ciphertext buffer size. The actual size of the output might be smaller in any given call. See also #PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE().

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Declaration

from crypto_sizes.h:1277

#define PSA_CIPHER_FINISH_OUTPUT_SIZE(key_type, alg) \ (PSA_ALG_IS_CIPHER(alg) ? \ (alg == PSA_ALG_CBC_PKCS7 ? \ PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type) : \ 0u) : \ 0u)

Arguments

Argument

Description

key_type

A symmetric key type that is compatible with algorithm alg.

alg

A cipher algorithm (PSA_ALG_XXX value such that #PSA_ALG_IS_CIPHER(\p alg) is true).

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.

References

Code

Location

#define PSA_CIPHER_FINISH_OUTPUT_SIZE(key_type, alg) \

crypto_sizes.h:1277

PSA_CIPHER_FINISH_OUTPUT_SIZE macro

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