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bd19d1aa
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体验新版 GitCode,发现更多精彩内容 >>
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bd19d1aa
编写于
7月 19, 2016
作者:
D
Dr. Stephen Henson
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电子邮件补丁
差异文件
Clarify digest change in HMAC_Init_ex()
RT#4603 Reviewed-by:
N
Rich Salz
<
rsalz@openssl.org
>
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3770b877
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doc/crypto/HMAC.pod
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doc/crypto/HMAC.pod
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@@ -79,13 +79,17 @@ function B<evp_md> and the key B<key> which is B<key_len> bytes
long. It is deprecated and only included for backward compatibility
with OpenSSL 0.9.6b.
HMAC_Init_ex() initializes or reuses a B<HMAC_CTX> structure to use
the function B<evp_md> and key B<key>. Either can be NULL, in which
case the existing one will be reused. B<ctx> must have been created
with HMAC_CTX_new() before the first use of an B<HMAC_CTX> in this
function. B<N.B. HMAC_Init() had this undocumented behaviour in
previous versions of OpenSSL - failure to switch to HMAC_Init_ex() in
programs that expect it will cause them to stop working>.
HMAC_Init_ex() initializes or reuses a B<HMAC_CTX> structure to use the hash
function B<evp_md> and key B<key>. If both are NULL (or B<evp_md> is the same
as the previous digest used by B<ctx> and B<key> is NULL) the existing key is
reused. B<ctx> must have been created with HMAC_CTX_new() before the first use
of an B<HMAC_CTX> in this function. B<N.B. HMAC_Init() had this undocumented
behaviour in previous versions of OpenSSL - failure to switch to HMAC_Init_ex()
in programs that expect it will cause them to stop working>.
B<NB: if HMAC_Init_ex() is called with B<key> NULL and B<evp_md> is not the
same as the previous digest used by B<ctx> then an error is returned
because reuse of an existing key with a different digest is not supported.>
HMAC_Update() can be called repeatedly with chunks of the message to
be authenticated (B<len> bytes at B<data>).
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