Commit 9437fe0b authored by Matt Caswell's avatar Matt Caswell
Browse files

Tolerate 0 byte input length for Update functions 



We treat that as automatic success. Other EVP_*Update functions already do
this (e.g. EVP_EncryptUpdate, EVP_DecryptUpdate etc). EVP_EncodeUpdate is
a bit of an anomoly. That treats 0 byte input length as an error.

Fixes #8576

Reviewed-by: default avatarTim Hudson <tjh@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8587)

(cherry picked from commit a8274ea351988aa754cb9983b27d7059613ee11e)
parent ce283e10

crypto/evp/digest.c

+3 −0
Original line number Diff line number Diff line
@@ -150,6 +150,9 @@ int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl) 


int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count)

{

    if (count == 0)

        return 1;



    return ctx->update(ctx, data, count);

}