pgp-cfb.c File Reference

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

Include dependency graph for pgp-cfb.c:

Go to the source code of this file.

Data Structures
struct	PGP_CFB

Typedefs
typedef int(*	mix_data_t) (PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst)

Functions
int	pgp_cfb_create (PGP_CFB **ctx_p, int algo, const uint8 *key, int key_len, int resync, uint8 *iv)
void	pgp_cfb_free (PGP_CFB *ctx)
static int	mix_encrypt_normal (PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst)
static int	mix_decrypt_normal (PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst)
static int	mix_encrypt_resync (PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst)
static int	mix_decrypt_resync (PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst)
static int	cfb_process (PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst, mix_data_t mix_data)
int	pgp_cfb_encrypt (PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst)
int	pgp_cfb_decrypt (PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst)

Typedef Documentation

mix_data_t

typedef int(* mix_data_t) (PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst)

Definition at line 37 of file pgp-cfb.c.

Function Documentation

cfb_process()

static int cfb_process ( PGP_CFB *  ctx, const uint8 *  data, int  len, uint8 *  dst, mix_data_t  mix_data  )

static

Definition at line 197 of file pgp-cfb.c.

{
    int         n;
    int         res;
 
    while (len > 0 && ctx->pos > 0)
    {
        n = ctx->block_size - ctx->pos;
        if (len < n)
            n = len;
 
        n = mix_data(ctx, data, n, dst);
        data += n;
        dst += n;
        len -= n;
 
        if (ctx->pos == ctx->block_size)
        {
            memcpy(ctx->fr, ctx->encbuf, ctx->block_size);
            ctx->pos = 0;
        }
    }
 
    while (len > 0)
    {
        unsigned    rlen;
 
        px_cipher_encrypt(ctx->ciph, 0, ctx->fr, ctx->block_size, ctx->fre, &rlen);
        if (ctx->block_no < 5)
            ctx->block_no++;
 
        n = ctx->block_size;
        if (len < n)
            n = len;
 
        res = mix_data(ctx, data, n, dst);
        data += res;
        dst += res;
        len -= res;
 
        if (ctx->pos == ctx->block_size)
        {
            memcpy(ctx->fr, ctx->encbuf, ctx->block_size);
            ctx->pos = 0;
        }
    }
    return 0;
}

References PGP_CFB::block_no, PGP_CFB::block_size, PGP_CFB::ciph, data, PGP_CFB::encbuf, PGP_CFB::fr, PGP_CFB::fre, len, PGP_CFB::pos, and px_cipher_encrypt.

Referenced by pgp_cfb_decrypt(), and pgp_cfb_encrypt().

mix_decrypt_normal()

static int mix_decrypt_normal ( PGP_CFB *  ctx, const uint8 *  data, int  len, uint8 *  dst  )

static

Definition at line 105 of file pgp-cfb.c.

{
    int         i;
 
    for (i = ctx->pos; i < ctx->pos + len; i++)
    {
        ctx->encbuf[i] = *data++;
        *dst++ = ctx->fre[i] ^ ctx->encbuf[i];
    }
    ctx->pos += len;
    return len;
}

References data, PGP_CFB::encbuf, PGP_CFB::fre, i, len, and PGP_CFB::pos.

Referenced by pgp_cfb_decrypt().

mix_decrypt_resync()

static int mix_decrypt_resync ( PGP_CFB *  ctx, const uint8 *  data, int  len, uint8 *  dst  )

static

Definition at line 157 of file pgp-cfb.c.

{
    int         i,
                n;
 
    /* block #2 is 2 bytes long */
    if (ctx->block_no == 2)
    {
        n = 2 - ctx->pos;
        if (len < n)
            n = len;
        for (i = ctx->pos; i < ctx->pos + n; i++)
        {
            ctx->encbuf[i] = *data++;
            *dst++ = ctx->fre[i] ^ ctx->encbuf[i];
        }
        ctx->pos += n;
        len -= n;
 
        if (ctx->pos == 2)
        {
            memcpy(ctx->fr, ctx->encbuf + 2, ctx->block_size - 2);
            memcpy(ctx->fr + ctx->block_size - 2, ctx->encbuf, 2);
            ctx->pos = 0;
            return n;
        }
    }
    for (i = ctx->pos; i < ctx->pos + len; i++)
    {
        ctx->encbuf[i] = *data++;
        *dst++ = ctx->fre[i] ^ ctx->encbuf[i];
    }
    ctx->pos += len;
    return len;
}

References PGP_CFB::block_no, PGP_CFB::block_size, data, PGP_CFB::encbuf, PGP_CFB::fr, PGP_CFB::fre, i, len, and PGP_CFB::pos.

Referenced by pgp_cfb_decrypt().

mix_encrypt_normal()

static int mix_encrypt_normal ( PGP_CFB *  ctx, const uint8 *  data, int  len, uint8 *  dst  )

static

Definition at line 94 of file pgp-cfb.c.

{
    int         i;
 
    for (i = ctx->pos; i < ctx->pos + len; i++)
        *dst++ = ctx->encbuf[i] = ctx->fre[i] ^ (*data++);
    ctx->pos += len;
    return len;
}

References data, PGP_CFB::encbuf, PGP_CFB::fre, i, len, and PGP_CFB::pos.

Referenced by pgp_cfb_encrypt().

mix_encrypt_resync()

static int mix_encrypt_resync ( PGP_CFB *  ctx, const uint8 *  data, int  len, uint8 *  dst  )

static

Definition at line 125 of file pgp-cfb.c.

{
    int         i,
                n;
 
    /* block #2 is 2 bytes long */
    if (ctx->block_no == 2)
    {
        n = 2 - ctx->pos;
        if (len < n)
            n = len;
        for (i = ctx->pos; i < ctx->pos + n; i++)
            *dst++ = ctx->encbuf[i] = ctx->fre[i] ^ (*data++);
 
        ctx->pos += n;
        len -= n;
 
        if (ctx->pos == 2)
        {
            memcpy(ctx->fr, ctx->encbuf + 2, ctx->block_size - 2);
            memcpy(ctx->fr + ctx->block_size - 2, ctx->encbuf, 2);
            ctx->pos = 0;
            return n;
        }
    }
    for (i = ctx->pos; i < ctx->pos + len; i++)
        *dst++ = ctx->encbuf[i] = ctx->fre[i] ^ (*data++);
    ctx->pos += len;
    return len;
}

References PGP_CFB::block_no, PGP_CFB::block_size, data, PGP_CFB::encbuf, PGP_CFB::fr, PGP_CFB::fre, i, len, and PGP_CFB::pos.

Referenced by pgp_cfb_encrypt().

pgp_cfb_create()

int pgp_cfb_create	(	PGP_CFB **	ctx_p,
		int	algo,
		const uint8 *	key,
		int	key_len,
		int	resync,
		uint8 *	iv
	)

Definition at line 52 of file pgp-cfb.c.

{
    int         res;
    PX_Cipher  *ciph;
    PGP_CFB    *ctx;
 
    res = pgp_load_cipher(algo, &ciph);
    if (res < 0)
        return res;
 
    res = px_cipher_init(ciph, key, key_len, NULL);
    if (res < 0)
    {
        px_cipher_free(ciph);
        return res;
    }
 
    ctx = palloc0(sizeof(*ctx));
    ctx->ciph = ciph;
    ctx->block_size = px_cipher_block_size(ciph);
    ctx->resync = resync;
 
    if (iv)
        memcpy(ctx->fr, iv, ctx->block_size);
 
    *ctx_p = ctx;
    return 0;
}

References PGP_CFB::block_size, PGP_CFB::ciph, PGP_CFB::fr, sort-test::key, palloc0(), pgp_load_cipher(), px_cipher_block_size, px_cipher_free, px_cipher_init, and PGP_CFB::resync.

Referenced by decrypt_key(), encrypt_init(), parse_symenc_data(), parse_symenc_mdc_data(), process_secret_key(), and symencrypt_sesskey().

pgp_cfb_decrypt()

int pgp_cfb_decrypt	(	PGP_CFB *	ctx,
		const uint8 *	data,
		int	len,
		uint8 *	dst
	)

Definition at line 260 of file pgp-cfb.c.

{
    mix_data_t  mix = ctx->resync ? mix_decrypt_resync : mix_decrypt_normal;
 
    return cfb_process(ctx, data, len, dst, mix);
}

References cfb_process(), data, len, mix, mix_decrypt_normal(), mix_decrypt_resync(), and PGP_CFB::resync.

Referenced by decrypt_key(), and decrypt_read().

pgp_cfb_encrypt()

int pgp_cfb_encrypt	(	PGP_CFB *	ctx,
		const uint8 *	data,
		int	len,
		uint8 *	dst
	)

Definition at line 252 of file pgp-cfb.c.

{
    mix_data_t  mix = ctx->resync ? mix_encrypt_resync : mix_encrypt_normal;
 
    return cfb_process(ctx, data, len, dst, mix);
}

References cfb_process(), data, len, mix, mix_encrypt_normal(), mix_encrypt_resync(), and PGP_CFB::resync.

Referenced by encrypt_process(), and symencrypt_sesskey().

pgp_cfb_free()

void pgp_cfb_free

(

PGP_CFB *

ctx

)

Definition at line 83 of file pgp-cfb.c.

{
    px_cipher_free(ctx->ciph);
    px_memset(ctx, 0, sizeof(*ctx));
    pfree(ctx);
}

References PGP_CFB::ciph, pfree(), px_cipher_free, and px_memset().

Referenced by decrypt_key(), encrypt_free(), parse_symenc_data(), parse_symenc_mdc_data(), process_secret_key(), and symencrypt_sesskey().