pgp-s2k.c File Reference

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

Include dependency graph for pgp-s2k.c:

Go to the source code of this file.

Functions
static int	calc_s2k_simple (PGP_S2K *s2k, PX_MD *md, const uint8 *key, unsigned key_len)
static int	calc_s2k_salted (PGP_S2K *s2k, PX_MD *md, const uint8 *key, unsigned key_len)
static int	calc_s2k_iter_salted (PGP_S2K *s2k, PX_MD *md, const uint8 *key, unsigned key_len)
static uint8	decide_s2k_iter (unsigned rand_byte, int count)
int	pgp_s2k_fill (PGP_S2K *s2k, int mode, int digest_algo, int count)
int	pgp_s2k_read (PullFilter *src, PGP_S2K *s2k)
int	pgp_s2k_process (PGP_S2K *s2k, int cipher, const uint8 *key, int key_len)

Function Documentation

calc_s2k_iter_salted()

static int calc_s2k_iter_salted ( PGP_S2K *  s2k, PX_MD *  md, const uint8 *  key, unsigned  key_len  )

static

Definition at line 126 of file pgp-s2k.c.

{
    unsigned    md_rlen;
    uint8       buf[PGP_MAX_DIGEST];
    uint8      *dst;
    unsigned    preload = 0;
    unsigned    remain,
                c,
                curcnt,
                count;
 
    count = s2k_decode_count(s2k->iter);
 
    md_rlen = px_md_result_size(md);
 
    remain = s2k->key_len;
    dst = s2k->key;
    while (remain > 0)
    {
        px_md_reset(md);
 
        if (preload)
        {
            memset(buf, 0, preload);
            px_md_update(md, buf, preload);
        }
        preload++;
 
        px_md_update(md, s2k->salt, PGP_S2K_SALT);
        px_md_update(md, key, key_len);
        curcnt = PGP_S2K_SALT + key_len;
 
        while (curcnt < count)
        {
            if (curcnt + PGP_S2K_SALT < count)
                c = PGP_S2K_SALT;
            else
                c = count - curcnt;
            px_md_update(md, s2k->salt, c);
            curcnt += c;
 
            if (curcnt + key_len < count)
                c = key_len;
            else if (curcnt < count)
                c = count - curcnt;
            else
                break;
            px_md_update(md, key, c);
            curcnt += c;
        }
        px_md_finish(md, buf);
 
        if (remain > md_rlen)
        {
            memcpy(dst, buf, md_rlen);
            remain -= md_rlen;
            dst += md_rlen;
        }
        else
        {
            memcpy(dst, buf, remain);
            remain = 0;
        }
    }
    px_memset(buf, 0, sizeof(buf));
    return 0;
}

References buf, PGP_S2K::iter, PGP_S2K::key, sort-test::key, PGP_S2K::key_len, PGP_MAX_DIGEST, PGP_S2K_SALT, px_md_finish, px_md_reset, px_md_result_size, px_md_update, px_memset(), s2k_decode_count, and PGP_S2K::salt.

Referenced by pgp_s2k_process().

calc_s2k_salted()

static int calc_s2k_salted ( PGP_S2K *  s2k, PX_MD *  md, const uint8 *  key, unsigned  key_len  )

static

Definition at line 82 of file pgp-s2k.c.

{
    unsigned    md_rlen;
    uint8       buf[PGP_MAX_DIGEST];
    unsigned    preload = 0;
    uint8      *dst;
    unsigned    remain;
 
    md_rlen = px_md_result_size(md);
 
    dst = s2k->key;
    remain = s2k->key_len;
    while (remain > 0)
    {
        px_md_reset(md);
 
        if (preload > 0)
        {
            memset(buf, 0, preload);
            px_md_update(md, buf, preload);
        }
        preload++;
 
        px_md_update(md, s2k->salt, PGP_S2K_SALT);
        px_md_update(md, key, key_len);
        px_md_finish(md, buf);
 
        if (remain > md_rlen)
        {
            memcpy(dst, buf, md_rlen);
            remain -= md_rlen;
            dst += md_rlen;
        }
        else
        {
            memcpy(dst, buf, remain);
            remain = 0;
        }
    }
    px_memset(buf, 0, sizeof(buf));
    return 0;
}

References buf, PGP_S2K::key, sort-test::key, PGP_S2K::key_len, PGP_MAX_DIGEST, PGP_S2K_SALT, px_md_finish, px_md_reset, px_md_result_size, px_md_update, px_memset(), and PGP_S2K::salt.

Referenced by pgp_s2k_process().

calc_s2k_simple()

static int calc_s2k_simple ( PGP_S2K *  s2k, PX_MD *  md, const uint8 *  key, unsigned  key_len  )

static

Definition at line 38 of file pgp-s2k.c.

{
    unsigned    md_rlen;
    uint8       buf[PGP_MAX_DIGEST];
    unsigned    preload;
    unsigned    remain;
    uint8      *dst = s2k->key;
 
    md_rlen = px_md_result_size(md);
 
    remain = s2k->key_len;
    preload = 0;
    while (remain > 0)
    {
        px_md_reset(md);
 
        if (preload)
        {
            memset(buf, 0, preload);
            px_md_update(md, buf, preload);
        }
        preload++;
 
        px_md_update(md, key, key_len);
        px_md_finish(md, buf);
 
        if (remain > md_rlen)
        {
            memcpy(dst, buf, md_rlen);
            dst += md_rlen;
            remain -= md_rlen;
        }
        else
        {
            memcpy(dst, buf, remain);
            remain = 0;
        }
    }
    px_memset(buf, 0, sizeof(buf));
    return 0;
}

References buf, PGP_S2K::key, sort-test::key, PGP_S2K::key_len, PGP_MAX_DIGEST, px_md_finish, px_md_reset, px_md_result_size, px_md_update, and px_memset().

Referenced by pgp_s2k_process().

decide_s2k_iter()

static uint8 decide_s2k_iter ( unsigned  rand_byte, int  count  )

static

Definition at line 209 of file pgp-s2k.c.

{
    int         iter;
 
    if (count == -1)
        return 96 + (rand_byte & 0x1F);
    /* this is a bit brute-force, but should be quick enough */
    for (iter = 0; iter <= 255; iter++)
        if (s2k_decode_count(iter) >= count)
            return iter;
    return 255;
}

References s2k_decode_count.

Referenced by pgp_s2k_fill().

pgp_s2k_fill()

int pgp_s2k_fill	(	PGP_S2K *	s2k,
		int	mode,
		int	digest_algo,
		int	count
	)

Definition at line 223 of file pgp-s2k.c.

{
    int         res = 0;
    uint8       tmp;
 
    s2k->mode = mode;
    s2k->digest_algo = digest_algo;
 
    switch (s2k->mode)
    {
        case PGP_S2K_SIMPLE:
            break;
        case PGP_S2K_SALTED:
            if (!pg_strong_random(s2k->salt, PGP_S2K_SALT))
                return PXE_NO_RANDOM;
            break;
        case PGP_S2K_ISALTED:
            if (!pg_strong_random(s2k->salt, PGP_S2K_SALT))
                return PXE_NO_RANDOM;
            if (!pg_strong_random(&tmp, 1))
                return PXE_NO_RANDOM;
            s2k->iter = decide_s2k_iter(tmp, count);
            break;
        default:
            res = PXE_PGP_BAD_S2K_MODE;
    }
    return res;
}

References decide_s2k_iter(), PGP_S2K::digest_algo, PGP_S2K::iter, PGP_S2K::mode, mode, pg_strong_random(), PGP_S2K_ISALTED, PGP_S2K_SALT, PGP_S2K_SALTED, PGP_S2K_SIMPLE, PXE_NO_RANDOM, PXE_PGP_BAD_S2K_MODE, res, and PGP_S2K::salt.

Referenced by init_s2k_key().

pgp_s2k_process()

int pgp_s2k_process	(	PGP_S2K *	s2k,
		int	cipher,
		const uint8 *	key,
		int	key_len
	)

Definition at line 279 of file pgp-s2k.c.

{
    int         res;
    PX_MD      *md;
 
    s2k->key_len = pgp_get_cipher_key_size(cipher);
    if (s2k->key_len <= 0)
        return PXE_PGP_UNSUPPORTED_CIPHER;
 
    res = pgp_load_digest(s2k->digest_algo, &md);
    if (res < 0)
        return res;
 
    switch (s2k->mode)
    {
        case 0:
            res = calc_s2k_simple(s2k, md, key, key_len);
            break;
        case 1:
            res = calc_s2k_salted(s2k, md, key, key_len);
            break;
        case 3:
            res = calc_s2k_iter_salted(s2k, md, key, key_len);
            break;
        default:
            res = PXE_PGP_BAD_S2K_MODE;
    }
    px_md_free(md);
    return res;
}

References calc_s2k_iter_salted(), calc_s2k_salted(), calc_s2k_simple(), PGP_S2K::digest_algo, sort-test::key, PGP_S2K::key_len, PGP_S2K::mode, pgp_get_cipher_key_size(), pgp_load_digest(), px_md_free, PXE_PGP_BAD_S2K_MODE, PXE_PGP_UNSUPPORTED_CIPHER, and res.

Referenced by init_s2k_key(), parse_symenc_sesskey(), and process_secret_key().

pgp_s2k_read()

int pgp_s2k_read	(	PullFilter *	src,
		PGP_S2K *	s2k
	)

Definition at line 253 of file pgp-s2k.c.

{
    int         res = 0;
 
    GETBYTE(src, s2k->mode);
    GETBYTE(src, s2k->digest_algo);
    switch (s2k->mode)
    {
        case 0:
            break;
        case 1:
            res = pullf_read_fixed(src, 8, s2k->salt);
            break;
        case 3:
            res = pullf_read_fixed(src, 8, s2k->salt);
            if (res < 0)
                break;
            GETBYTE(src, s2k->iter);
            break;
        default:
            res = PXE_PGP_BAD_S2K_MODE;
    }
    return res;
}

References PGP_S2K::digest_algo, GETBYTE, PGP_S2K::iter, PGP_S2K::mode, pullf_read_fixed(), PXE_PGP_BAD_S2K_MODE, res, and PGP_S2K::salt.

Referenced by parse_symenc_sesskey(), and process_secret_key().