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Add error return value information for EVP_MD_get_size()

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Add error return value information for EVP_MD_get_size() and
EVP_MD_CTX_get_size() to better guide their usages and avoid
the integer overflow, such as
4a50882 ("ssl_cipher_get_overhead(): Replace size_t with int and add the checks")
and ef9ac2f ("test/bad_dtls_test.c: Add checks for the EVP_MD_CTX_get_size()").

Signed-off-by: Jiasheng Jiang <jiashengjiangcool@outlook.com>

Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/25282)
This commit is contained in:
Jiasheng Jiang 2024-08-30 19:36:51 +00:00 committed by Tomas Mraz
parent d15077d336
commit 09ae1c9f5a
1 changed files with 3 additions and 3 deletions
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6
doc/man3/EVP_DigestInit.pod
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@ -386,9 +386,9 @@ B<EVP_MD>.
=item EVP_MD_get_size()
Return the size of the message digest when passed an B<EVP_MD> or an
B<EVP_MD_CTX> structure, i.e. the size of the hash.
For an XOF this returns 0.
Return the size of the message digest when passed an B<EVP_MD>, i.e. the size of
the hash. A negative value or 0 can occur for invalid size.
For an XOF with no default size this returns 0.
=item EVP_MD_CTX_get_size_ex(), EVP_MD_CTX_get_size()