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openssl: guard against OOM on context creation #6224

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danielgustafsson
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EVP_MD_CTX_create will allocate memory for the context and returns
NULL in case the allocation fails. Make sure to catch any allocation
failures and exit early if so.

In passing, also move to EVP_DigestInit rather than EVP_DigestInit_ex
as the latter is intended for ENGINE selection which we don't do.

EVP_MD_CTX_create will allocate memory for the context and returns
NULL in case the allocation fails. Make sure to catch any allocation
failures and exit early if so.

In passing, also move to EVP_DigestInit rather than EVP_DigestInit_ex
as the latter is intended for ENGINE selection which we don't do.
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