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signature/ecdsa_sig.c: Add checks for the EVP_MD_get_size()
Add checks for the EVP_MD_get_size() to avoid integer overflow and then explicitly cast from int to size_t. Fixes: edd3b7a ("Add ECDSA to providers") Signed-off-by: Jiasheng Jiang <jiasheng@purdue.edu> Reviewed-by: Shane Lontis <shane.lontis@oracle.com> Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from #23947)
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