px-hmac.c File Reference

#include "postgres.h"
#include "px.h"

Include dependency graph for px-hmac.c:

Go to the source code of this file.

Defines
#define	HMAC_IPAD   0x36
#define	HMAC_OPAD   0x5C
Functions
static unsigned	hmac_result_size (PX_HMAC *h)
static unsigned	hmac_block_size (PX_HMAC *h)
static void	hmac_init (PX_HMAC *h, const uint8 *key, unsigned klen)
static void	hmac_reset (PX_HMAC *h)
static void	hmac_update (PX_HMAC *h, const uint8 *data, unsigned dlen)
static void	hmac_finish (PX_HMAC *h, uint8 *dst)
static void	hmac_free (PX_HMAC *h)
int	px_find_hmac (const char *name, PX_HMAC **res)

---

Define Documentation

#define HMAC_IPAD   0x36

Definition at line 36 of file px-hmac.c.

#define HMAC_OPAD   0x5C

Definition at line 37 of file px-hmac.c.

---

Function Documentation

static unsigned hmac_block_size

(

PX_HMAC *

h

)

[static]

Definition at line 46 of file px-hmac.c.

References px_hmac::md, and px_md_block_size.

{
    return px_md_block_size(h->md);
}

static void hmac_finish	(	PX_HMAC *	h,
		uint8 *	dst
	)			[static]

Definition at line 101 of file px-hmac.c.

References buf, px_hmac::md, px_hmac::opad, px_hmac::p, px_alloc, px_free, px_md_block_size, px_md_finish, px_md_reset, px_md_result_size, and px_md_update.

{
    PX_MD      *md = h->md;
    unsigned    bs,
                hlen;
    uint8      *buf;

    bs = px_md_block_size(md);
    hlen = px_md_result_size(md);

    buf = px_alloc(hlen);

    px_md_finish(md, buf);

    px_md_reset(md);
    px_md_update(md, h->p.opad, bs);
    px_md_update(md, buf, hlen);
    px_md_finish(md, dst);

    memset(buf, 0, hlen);
    px_free(buf);
}

static void hmac_free

(

PX_HMAC *

h

)

[static]

Definition at line 125 of file px-hmac.c.

References px_hmac::ipad, px_hmac::md, px_hmac::opad, px_hmac::p, px_free, px_md_block_size, and px_md_free.

{
    unsigned    bs;

    bs = px_md_block_size(h->md);
    px_md_free(h->md);

    memset(h->p.ipad, 0, bs);
    memset(h->p.opad, 0, bs);
    px_free(h->p.ipad);
    px_free(h->p.opad);
    px_free(h);
}

static void hmac_init	(	PX_HMAC *	h,
		const uint8 *	key,
		unsigned	klen
	)			[static]

Definition at line 52 of file px-hmac.c.

References i, px_hmac::ipad, px_hmac::md, px_hmac::opad, px_hmac::p, px_alloc, px_free, px_md_block_size, px_md_finish, px_md_reset, and px_md_update.

{
    unsigned    bs,
                i;
    uint8      *keybuf;
    PX_MD      *md = h->md;

    bs = px_md_block_size(md);
    keybuf = px_alloc(bs);
    memset(keybuf, 0, bs);

    if (klen > bs)
    {
        px_md_update(md, key, klen);
        px_md_finish(md, keybuf);
        px_md_reset(md);
    }
    else
        memcpy(keybuf, key, klen);

    for (i = 0; i < bs; i++)
    {
        h->p.ipad[i] = keybuf[i] ^ HMAC_IPAD;
        h->p.opad[i] = keybuf[i] ^ HMAC_OPAD;
    }

    memset(keybuf, 0, bs);
    px_free(keybuf);

    px_md_update(md, h->p.ipad, bs);
}

static void hmac_reset

(

PX_HMAC *

h

)

[static]

Definition at line 85 of file px-hmac.c.

References px_hmac::ipad, px_hmac::md, px_hmac::p, px_md_block_size, px_md_reset, and px_md_update.

{
    PX_MD      *md = h->md;
    unsigned    bs = px_md_block_size(md);

    px_md_reset(md);
    px_md_update(md, h->p.ipad, bs);
}

static unsigned hmac_result_size

(

PX_HMAC *

h

)

[static]

Definition at line 40 of file px-hmac.c.

References px_hmac::md, and px_md_result_size.

{
    return px_md_result_size(h->md);
}

static void hmac_update	(	PX_HMAC *	h,
		const uint8 *	data,
		unsigned	dlen
	)			[static]

Definition at line 95 of file px-hmac.c.

References px_hmac::md, and px_md_update.

{
    px_md_update(h->md, data, dlen);
}

int px_find_hmac	(	const char *	name,
		PX_HMAC **	res
	)

Definition at line 143 of file px-hmac.c.

References px_hmac::block_size, px_hmac::finish, px_hmac::free, px_hmac::init, px_hmac::ipad, px_hmac::md, px_hmac::opad, px_hmac::p, px_alloc, px_find_digest(), px_md_block_size, px_md_free, px_hmac::reset, px_hmac::result_size, and px_hmac::update.

Referenced by pg_hmac().

{
    int         err;
    PX_MD      *md;
    PX_HMAC    *h;
    unsigned    bs;

    err = px_find_digest(name, &md);
    if (err)
        return err;

    bs = px_md_block_size(md);
    if (bs < 2)
    {
        px_md_free(md);
        return PXE_HASH_UNUSABLE_FOR_HMAC;
    }

    h = px_alloc(sizeof(*h));
    h->p.ipad = px_alloc(bs);
    h->p.opad = px_alloc(bs);
    h->md = md;

    h->result_size = hmac_result_size;
    h->block_size = hmac_block_size;
    h->reset = hmac_reset;
    h->update = hmac_update;
    h->finish = hmac_finish;
    h->free = hmac_free;
    h->init = hmac_init;

    *res = h;

    return 0;
}