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Tolerate 0 byte input length for Update functions

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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: Tim Hudson <tjh@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8587)
This commit is contained in:
Matt Caswell 2019-03-26 15:25:15 +00:00
parent 1f019cd0ac
commit a8274ea351
2 changed files with 5 additions and 0 deletions
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3
crypto/evp/digest.c
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@ -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;

2
crypto/evp/mac_lib.c
View File

@ -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);
}