PostgreSQL Source Code  git master
pgp-cfb.c File Reference
#include "postgres.h"
#include "pgp.h"
#include "px.h"
Include dependency graph for pgp-cfb.c:

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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.

199 {
200  int n;
201  int res;
202 
203  while (len > 0 && ctx->pos > 0)
204  {
205  n = ctx->block_size - ctx->pos;
206  if (len < n)
207  n = len;
208 
209  n = mix_data(ctx, data, n, dst);
210  data += n;
211  dst += n;
212  len -= n;
213 
214  if (ctx->pos == ctx->block_size)
215  {
216  memcpy(ctx->fr, ctx->encbuf, ctx->block_size);
217  ctx->pos = 0;
218  }
219  }
220 
221  while (len > 0)
222  {
223  unsigned rlen;
224 
225  px_cipher_encrypt(ctx->ciph, 0, ctx->fr, ctx->block_size, ctx->fre, &rlen);
226  if (ctx->block_no < 5)
227  ctx->block_no++;
228 
229  n = ctx->block_size;
230  if (len < n)
231  n = len;
232 
233  res = mix_data(ctx, data, n, dst);
234  data += res;
235  dst += res;
236  len -= res;
237 
238  if (ctx->pos == ctx->block_size)
239  {
240  memcpy(ctx->fr, ctx->encbuf, ctx->block_size);
241  ctx->pos = 0;
242  }
243  }
244  return 0;
245 }
const void size_t len
const void * data
#define px_cipher_encrypt(c, padding, data, dlen, res, rlen)
Definition: px.h:211
int block_size
Definition: pgp-cfb.c:42
PX_Cipher * ciph
Definition: pgp-cfb.c:41
int pos
Definition: pgp-cfb.c:43
uint8 fre[PGP_MAX_BLOCK]
Definition: pgp-cfb.c:47
uint8 encbuf[PGP_MAX_BLOCK]
Definition: pgp-cfb.c:48
uint8 fr[PGP_MAX_BLOCK]
Definition: pgp-cfb.c:46
int block_no
Definition: pgp-cfb.c:44

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, px_cipher_encrypt, and res.

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.

106 {
107  int i;
108 
109  for (i = ctx->pos; i < ctx->pos + len; i++)
110  {
111  ctx->encbuf[i] = *data++;
112  *dst++ = ctx->fre[i] ^ ctx->encbuf[i];
113  }
114  ctx->pos += len;
115  return len;
116 }
int i
Definition: isn.c:72

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.

158 {
159  int i,
160  n;
161 
162  /* block #2 is 2 bytes long */
163  if (ctx->block_no == 2)
164  {
165  n = 2 - ctx->pos;
166  if (len < n)
167  n = len;
168  for (i = ctx->pos; i < ctx->pos + n; i++)
169  {
170  ctx->encbuf[i] = *data++;
171  *dst++ = ctx->fre[i] ^ ctx->encbuf[i];
172  }
173  ctx->pos += n;
174  len -= n;
175 
176  if (ctx->pos == 2)
177  {
178  memcpy(ctx->fr, ctx->encbuf + 2, ctx->block_size - 2);
179  memcpy(ctx->fr + ctx->block_size - 2, ctx->encbuf, 2);
180  ctx->pos = 0;
181  return n;
182  }
183  }
184  for (i = ctx->pos; i < ctx->pos + len; i++)
185  {
186  ctx->encbuf[i] = *data++;
187  *dst++ = ctx->fre[i] ^ ctx->encbuf[i];
188  }
189  ctx->pos += len;
190  return len;
191 }

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.

95 {
96  int i;
97 
98  for (i = ctx->pos; i < ctx->pos + len; i++)
99  *dst++ = ctx->encbuf[i] = ctx->fre[i] ^ (*data++);
100  ctx->pos += len;
101  return len;
102 }

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.

126 {
127  int i,
128  n;
129 
130  /* block #2 is 2 bytes long */
131  if (ctx->block_no == 2)
132  {
133  n = 2 - ctx->pos;
134  if (len < n)
135  n = len;
136  for (i = ctx->pos; i < ctx->pos + n; i++)
137  *dst++ = ctx->encbuf[i] = ctx->fre[i] ^ (*data++);
138 
139  ctx->pos += n;
140  len -= n;
141 
142  if (ctx->pos == 2)
143  {
144  memcpy(ctx->fr, ctx->encbuf + 2, ctx->block_size - 2);
145  memcpy(ctx->fr + ctx->block_size - 2, ctx->encbuf, 2);
146  ctx->pos = 0;
147  return n;
148  }
149  }
150  for (i = ctx->pos; i < ctx->pos + len; i++)
151  *dst++ = ctx->encbuf[i] = ctx->fre[i] ^ (*data++);
152  ctx->pos += len;
153  return len;
154 }

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.

54 {
55  int res;
56  PX_Cipher *ciph;
57  PGP_CFB *ctx;
58 
59  res = pgp_load_cipher(algo, &ciph);
60  if (res < 0)
61  return res;
62 
63  res = px_cipher_init(ciph, key, key_len, NULL);
64  if (res < 0)
65  {
66  px_cipher_free(ciph);
67  return res;
68  }
69 
70  ctx = palloc0(sizeof(*ctx));
71  ctx->ciph = ciph;
72  ctx->block_size = px_cipher_block_size(ciph);
73  ctx->resync = resync;
74 
75  if (iv)
76  memcpy(ctx->fr, iv, ctx->block_size);
77 
78  *ctx_p = ctx;
79  return 0;
80 }
void * palloc0(Size size)
Definition: mcxt.c:1347
int pgp_load_cipher(int code, PX_Cipher **res)
Definition: pgp.c:157
#define px_cipher_free(c)
Definition: px.h:215
#define px_cipher_block_size(c)
Definition: px.h:208
#define px_cipher_init(c, k, klen, iv)
Definition: px.h:210
int resync
Definition: pgp-cfb.c:45
Definition: px.h:141

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, res, 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.

261 {
263 
264  return cfb_process(ctx, data, len, dst, mix);
265 }
#define mix(a, b, c)
Definition: hashfn.c:82
static int mix_decrypt_resync(PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst)
Definition: pgp-cfb.c:157
static int cfb_process(PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst, mix_data_t mix_data)
Definition: pgp-cfb.c:197
int(* mix_data_t)(PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst)
Definition: pgp-cfb.c:37
static int mix_decrypt_normal(PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst)
Definition: pgp-cfb.c:105

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.

253 {
255 
256  return cfb_process(ctx, data, len, dst, mix);
257 }
static int mix_encrypt_resync(PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst)
Definition: pgp-cfb.c:125
static int mix_encrypt_normal(PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst)
Definition: pgp-cfb.c:94

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.

84 {
85  px_cipher_free(ctx->ciph);
86  px_memset(ctx, 0, sizeof(*ctx));
87  pfree(ctx);
88 }
void pfree(void *pointer)
Definition: mcxt.c:1521
void px_memset(void *ptr, int c, size_t len)
Definition: px.c:123

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().