Commit a8274ea3 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)
parent 1f019cd0

crypto/evp/digest.c

+3 −0
Original line number Diff line number Diff line
@@ -259,6 +259,9 @@ 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;



    if (ctx->digest == NULL || ctx->digest->prov == NULL)

        goto legacy;

crypto/evp/mac_lib.c

+2 −0
Original line number Diff line number Diff line
@@ -82,6 +82,8 @@ int EVP_MAC_init(EVP_MAC_CTX *ctx) 


int EVP_MAC_update(EVP_MAC_CTX *ctx, const unsigned char *data, size_t datalen)

{

    if (datalen == 0)

        return 1;

    return ctx->meth->update(ctx->data, data, datalen);

}