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Document the HMAC changes

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Reviewed-by: Rich Salz <rsalz@openssl.org>
This commit is contained in:
Richard Levitte 2015-11-30 23:43:59 +01:00
parent 25191fffb9
commit 716854d74e
1 changed files with 24 additions and 13 deletions
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37
doc/crypto/hmac.pod
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@ -2,7 +2,7 @@
=head1 NAME
HMAC, HMAC_CTX_init, HMAC_Init, HMAC_Init_ex, HMAC_Update, HMAC_Final, HMAC_CTX_cleanup - HMAC message authentication code
HMAC, HMAC_CTX_new, HMAC_CTX_reset, HMAC_CTX_free, HMAC_Init, HMAC_Init_ex, HMAC_Update, HMAC_Final - HMAC message authentication code
=head1 SYNOPSIS
@ -12,7 +12,8 @@ HMAC, HMAC_CTX_init, HMAC_Init, HMAC_Init_ex, HMAC_Update, HMAC_Final, HMAC_CTX_
int key_len, const unsigned char *d, int n,
unsigned char *md, unsigned int *md_len);
int HMAC_CTX_init(HMAC_CTX *ctx);
HMAC_CTX *HMAC_CTX_new(void);
int HMAC_CTX_reset(HMAC_CTX *ctx);
int HMAC_Init(HMAC_CTX *ctx, const void *key, int key_len,
const EVP_MD *md);
@ -21,7 +22,7 @@ HMAC, HMAC_CTX_init, HMAC_Init, HMAC_Init_ex, HMAC_Update, HMAC_Final, HMAC_CTX_
int HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, int len);
int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len);
void HMAC_CTX_cleanup(HMAC_CTX *ctx);
void HMAC_CTX_free(HMAC_CTX *ctx);
=head1 DESCRIPTION
@ -40,12 +41,15 @@ the output is placed in B<md_len>, unless it is B<NULL>.
B<evp_md> can be EVP_sha1(), EVP_ripemd160() etc.
HMAC_CTX_init() initialises a B<HMAC_CTX> before first use. It must be
called.
HMAC_CTX_new() creates a new HMAC_CTX in heap memory.
HMAC_CTX_cleanup() erases the key and other data from the B<HMAC_CTX>
and releases any associated resources. It must be called when an
B<HMAC_CTX> is no longer required.
HMAC_CTX_reset() zeroes an existing B<HMAC_CTX> and associated
resources, making it suitable for new computations as if it was newly
created with HMAC_CTX_new().
HMAC_CTX_free() erases the key and other data from the B<HMAC_CTX>,
releases any associated resources and finally frees the B<HMAC_CTX>
itself.
The following functions may be used if the message is not completely
stored in memory:
@ -57,8 +61,8 @@ 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. HMAC_CTX_init() must have been
called before the first use of an B<HMAC_CTX> in this
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>.
@ -74,10 +78,13 @@ must have space for the hash function output.
HMAC() returns a pointer to the message authentication code or NULL if
an error occurred.
HMAC_CTX_init(), HMAC_Init_ex(), HMAC_Update() and HMAC_Final() return 1
HMAC_CTX_new() returns a pointer to a new B<HMAC_CTX> on success or
B<NULL> if an error occurred.
HMAC_CTX_reset(), HMAC_Init_ex(), HMAC_Update() and HMAC_Final() return 1
for success or 0 if an error occurred.
HMAC_CTX_cleanup() do not return values.
HMAC_CTX_free() do not return values.
=head1 CONFORMING TO
@ -89,7 +96,11 @@ L<sha(3)>, L<evp(3)>
=head1 HISTORY
HMAC_CTX_init() did not return a value in OpenSSL versions before 1.1.
HMAC_CTX_init() was replaced with HMAC_CTX_reset() in OpenSSL versions 1.1.
HMAC_CTX_cleanup() existed in OpenSSL versions before 1.1.
HMAC_CTX_new() and HMAC_CTX_free() are new in OpenSSL version 1.1.
HMAC_Init_ex(), HMAC_Update() and HMAC_Final() did not return values in
versions of OpenSSL before 1.0.0.