Fix documentation of return value for EVP_Digest{Sign,Verify}Init()

They never returned the negative values that the documentation stated.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/10847)

1 files changed, 9 insertions, 0 deletions

diff --git a/CHANGES b/CHANGES
index 42382fd031..e4d57bb6b5 100644
--- a/CHANGES
+++ b/CHANGES
@@ -9,6 +9,15 @@
 
  Changes between 1.1.1d and 1.1.1e [xx XXX xxxx]
 
+  *) Corrected the documentation of the return values from the EVP_DigestSign*
+     set of functions.  The documentation mentioned negative values for some
+     errors, but this was never the case, so the mention of negative values
+     was removed.
+
+     Code that followed the documentation and thereby check with something
+     like 'EVP_DigestSignInit(...) <= 0' will continue to work undisturbed.
+     [Richard Levitte]
+
   *) Fixed an an overflow bug in the x64_64 Montgomery squaring procedure
      used in exponentiation with 512-bit moduli. No EC algorithms are
      affected. Analysis suggests that attacks against 2-prime RSA1024,