Require in == out for in-place encryption.
While most of OpenSSL's assembly allows out < in too, some of it doesn't.
Upstream seems to not consider this a problem (or, at least, they're failing to
make a decision on whether it is a problem, so we should assume they'll stay
their course). Accordingly, require aliased buffers to exactly align so we
don't have to keep chasing this down.
Change-Id: I00eb3df3e195b249116c68f7272442918d7077eb
Reviewed-on: https://boringssl-review.googlesource.com/8231
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/ssl/internal.h b/ssl/internal.h
index 6d96c6c..4cf7a2e 100644
--- a/ssl/internal.h
+++ b/ssl/internal.h
@@ -325,7 +325,7 @@
* writes the result to |out|. It returns one on success and zero on
* error. |ctx| may be NULL to denote the null cipher.
*
- * If |in| and |out| alias then |out| + |explicit_nonce_len| must be <= |in| */
+ * If |in| and |out| alias then |out| + |explicit_nonce_len| must be == |in|. */
int SSL_AEAD_CTX_seal(SSL_AEAD_CTX *ctx, uint8_t *out, size_t *out_len,
size_t max_out, uint8_t type, uint16_t wire_version,
const uint8_t seqnum[8], const uint8_t *in,
