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Add an example of usage to the WPACKET_reserve_bytes() documentation

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Reviewed-by: Rich Salz <rsalz@openssl.org>
This commit is contained in:
Matt Caswell 2016-09-29 14:45:49 +01:00
parent ff8194774c
commit 0023baffb8
1 changed files with 10 additions and 0 deletions
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10
ssl/packet_locl.h
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@ -707,6 +707,16 @@ int WPACKET_sub_allocate_bytes__(WPACKET *pkt, size_t len,
* maximum size will be. If this function is used, then it should be immediately
* followed by a WPACKET_allocate_bytes() call before any other WPACKET
* functions are called (unless the write to the allocated bytes is abandoned).
*
* For example: If we are generating a signature, then the size of that
* signature may not be known in advance. We can use WPACKET_reserve_bytes() to
* handle this:
*
* if (!WPACKET_sub_reserve_bytes_u16(&pkt, EVP_PKEY_size(pkey), &sigbytes1)
* || EVP_SignFinal(md_ctx, sigbytes1, &siglen, pkey) <= 0
* || !WPACKET_sub_allocate_bytes_u16(&pkt, siglen, &sigbytes2)
* || sigbytes1 != sigbytes2)
* goto err;
*/
int WPACKET_reserve_bytes(WPACKET *pkt, size_t len, unsigned char **allocbytes);