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Change sha256 output type from an array to a pointer

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The output parameter of mbedtls_sha256_finish_ret and mbedtls_sha256_ret
now has a pointer type rather than array type. This removes spurious
warnings in some compilers when outputting a SHA-224 hash into a
28-byte buffer.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2021-05-13 00:45:25 +02:00
parent 3e3a6789d1
commit d7b3d92476
4 changed files with 17 additions and 14 deletions
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docs/3.0-migration-guide.d/sha512-output-type.md
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@ -1,8 +1,8 @@
SHA-512 output type change
SHA-512 and SHA-256 output type change
--------------------------
The output parameter of `mbedtls_sha512_finish_ret()` and `mbedtls_sha512_ret()` now has a pointer type rather than array type. This makes no difference in terms of C semantics, but removes spurious warnings in some compilers when outputting a SHA-384 hash into a 48-byte buffer.
The output parameter of `mbedtls_sha256_finish_ret()`, `mbedtls_sha256_ret()`, `mbedtls_sha512_finish_ret()`, `mbedtls_sha512_ret()` now has a pointer type rather than array type. This makes no difference in terms of C semantics, but removes spurious warnings in some compilers when outputting a SHA-384 hash into a 48-byte buffer or a SHA-224 hash into a 28-byte buffer.
This makes no difference to a vast majority of applications. If your code takes a pointer to one of these functions, you may need to change the type of the pointer.
Alternative implementations of the SHA512 module must adjust their functions' prototype accordingly.
Alternative implementations of the SHA256 and SHA512 modules must adjust their functions' prototype accordingly.