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

Go to the source code of this file.

Functions

static int  pad_eme_pkcs1_v15 (uint8 *data, int data_len, int res_len, uint8 **res_p)
 
static int  create_secmsg (PGP_Context *ctx, PGP_MPI **msg_p, int full_bytes)
 
static int  encrypt_and_write_elgamal (PGP_Context *ctx, PGP_PubKey *pk, PushFilter *pkt)
 
static int  encrypt_and_write_rsa (PGP_Context *ctx, PGP_PubKey *pk, PushFilter *pkt)
 
int  pgp_write_pubenc_sesskey (PGP_Context *ctx, PushFilter *dst)
 

Function Documentation

◆ create_secmsg()

static int create_secmsg ( PGP_Context *  ctx,
PGP_MPI **  msg_p,
int  full_bytes 
)
static

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

84{
85 uint8 *secmsg;
86 int res,
87 i;
88 unsigned cksum = 0;
89 int klen = ctx->sess_key_len;
90 uint8 *padded = NULL;
91 PGP_MPI *m = NULL;
92
93 /* calc checksum */
94 for (i = 0; i < klen; i++)
95 cksum += ctx->sess_key[i];
96
97 /*
98 * create "secret message"
99 */
100 secmsg = palloc(klen + 3);
101 secmsg[0] = ctx->cipher_algo;
102 memcpy(secmsg + 1, ctx->sess_key, klen);
103 secmsg[klen + 1] = (cksum >> 8) & 0xFF;
104 secmsg[klen + 2] = cksum & 0xFF;
105
106 /*
107 * now create a large integer of it
108 */
109 res = pad_eme_pkcs1_v15(secmsg, klen + 3, full_bytes, &padded);
110 if (res >= 0)
111 {
112 /* first byte will be 0x02 */
113 int full_bits = full_bytes * 8 - 6;
114
115 res = pgp_mpi_create(padded, full_bits, &m);
116 }
117
118 if (padded)
119 {
120 px_memset(padded, 0, full_bytes);
121 pfree(padded);
122 }
123 px_memset(secmsg, 0, klen + 3);
124 pfree(secmsg);
125
126 if (res >= 0)
127 *msg_p = m;
128
129 return res;
130}
uint8_t uint8
Definition: c.h:536
i
int i
Definition: isn.c:77
void pfree(void *pointer)
Definition: mcxt.c:1594
void * palloc(Size size)
Definition: mcxt.c:1365
int pgp_mpi_create(uint8 *data, int bits, PGP_MPI **mpi)
Definition: pgp-mpi.c:56
static int pad_eme_pkcs1_v15(uint8 *data, int data_len, int res_len, uint8 **res_p)
Definition: pgp-pubenc.c:40
void px_memset(void *ptr, int c, size_t len)
Definition: px.c:123
unsigned sess_key_len
Definition: pgp.h:172
int cipher_algo
Definition: pgp.h:144
uint8 sess_key[PGP_MAX_KEY]
Definition: pgp.h:171
Definition: pgp.h:180

References PGP_Context::cipher_algo, i, pad_eme_pkcs1_v15(), palloc(), pfree(), pgp_mpi_create(), px_memset(), PGP_Context::sess_key, and PGP_Context::sess_key_len.

Referenced by encrypt_and_write_elgamal(), and encrypt_and_write_rsa().

◆ encrypt_and_write_elgamal()

static int encrypt_and_write_elgamal ( PGP_Context *  ctx,
PGP_PubKey *  pk,
PushFilter *  pkt 
)
static

Definition at line 133 of file pgp-pubenc.c.

134{
135 int res;
136 PGP_MPI *m = NULL,
137 *c1 = NULL,
138 *c2 = NULL;
139
140 /* create padded msg */
141 res = create_secmsg(ctx, &m, pk->pub.elg.p->bytes - 1);
142 if (res < 0)
143 goto err;
144
145 /* encrypt it */
146 res = pgp_elgamal_encrypt(pk, m, &c1, &c2);
147 if (res < 0)
148 goto err;
149
150 /* write out */
151 res = pgp_mpi_write(pkt, c1);
152 if (res < 0)
153 goto err;
154 res = pgp_mpi_write(pkt, c2);
155
156err:
157 pgp_mpi_free(m);
158 pgp_mpi_free(c1);
159 pgp_mpi_free(c2);
160 return res;
161}
void err(int eval, const char *fmt,...)
Definition: err.c:43
int pgp_elgamal_encrypt(PGP_PubKey *pk, PGP_MPI *_m, PGP_MPI **c1_p, PGP_MPI **c2_p)
int pgp_mpi_free(PGP_MPI *mpi)
Definition: pgp-mpi.c:70
int pgp_mpi_write(PushFilter *dst, PGP_MPI *n)
Definition: pgp-mpi.c:105
static int create_secmsg(PGP_Context *ctx, PGP_MPI **msg_p, int full_bytes)
Definition: pgp-pubenc.c:83
int bytes
Definition: pgp.h:183
struct PGP_PubKey::@0::@2 elg
PGP_MPI * p
Definition: pgp.h:197
union PGP_PubKey::@0 pub

References PGP_MPI::bytes, create_secmsg(), PGP_PubKey::elg, err(), PGP_PubKey::p, pgp_elgamal_encrypt(), pgp_mpi_free(), pgp_mpi_write(), and PGP_PubKey::pub.

Referenced by pgp_write_pubenc_sesskey().

◆ encrypt_and_write_rsa()

static int encrypt_and_write_rsa ( PGP_Context *  ctx,
PGP_PubKey *  pk,
PushFilter *  pkt 
)
static

Definition at line 164 of file pgp-pubenc.c.

165{
166 int res;
167 PGP_MPI *m = NULL,
168 *c = NULL;
169
170 /* create padded msg */
171 res = create_secmsg(ctx, &m, pk->pub.rsa.n->bytes - 1);
172 if (res < 0)
173 goto err;
174
175 /* encrypt it */
176 res = pgp_rsa_encrypt(pk, m, &c);
177 if (res < 0)
178 goto err;
179
180 /* write out */
181 res = pgp_mpi_write(pkt, c);
182
183err:
184 pgp_mpi_free(m);
186 return res;
187}
int pgp_rsa_encrypt(PGP_PubKey *pk, PGP_MPI *_m, PGP_MPI **c_p)
c
char * c
Definition: preproc-cursor.c:31
struct PGP_PubKey::@0::@3 rsa
PGP_MPI * n
Definition: pgp.h:203

References PGP_MPI::bytes, create_secmsg(), err(), PGP_PubKey::n, pgp_mpi_free(), pgp_mpi_write(), pgp_rsa_encrypt(), PGP_PubKey::pub, and PGP_PubKey::rsa.

Referenced by pgp_write_pubenc_sesskey().

◆ pad_eme_pkcs1_v15()

static int pad_eme_pkcs1_v15 ( uint8 *  data,
int  data_len,
int  res_len,
uint8 **  res_p 
)
static

Definition at line 40 of file pgp-pubenc.c.

41{
42 uint8 *buf,
43 *p;
44 int pad_len = res_len - 2 - data_len;
45
46 if (pad_len < 8)
47 return PXE_BUG;
48
49 buf = palloc(res_len);
50 buf[0] = 0x02;
51
52 if (!pg_strong_random(buf + 1, pad_len))
53 {
54 pfree(buf);
55 return PXE_NO_RANDOM;
56 }
57
58 /* pad must not contain zero bytes */
59 p = buf + 1;
60 while (p < buf + 1 + pad_len)
61 {
62 if (*p == 0)
63 {
64 if (!pg_strong_random(p, 1))
65 {
66 px_memset(buf, 0, res_len);
67 pfree(buf);
68 return PXE_NO_RANDOM;
69 }
70 }
71 if (*p != 0)
72 p++;
73 }
74
75 buf[pad_len + 1] = 0;
76 memcpy(buf + pad_len + 2, data, data_len);
77 *res_p = buf;
78
79 return 0;
80}
const void * data
static char * buf
Definition: pg_test_fsync.c:72
bool pg_strong_random(void *buf, size_t len)
#define PXE_BUG
Definition: px.h:58
#define PXE_NO_RANDOM
Definition: px.h:63

References buf, data, palloc(), pfree(), pg_strong_random(), px_memset(), PXE_BUG, and PXE_NO_RANDOM.

Referenced by create_secmsg().

◆ pgp_write_pubenc_sesskey()

int pgp_write_pubenc_sesskey ( PGP_Context *  ctx,
PushFilter *  dst 
)

Definition at line 190 of file pgp-pubenc.c.

191{
192 int res;
193 PGP_PubKey *pk = ctx->pub_key;
194 uint8 ver = 3;
195 PushFilter *pkt = NULL;
196 uint8 algo;
197
198 if (pk == NULL)
199 {
200 px_debug("no pubkey?\n");
201 return PXE_BUG;
202 }
203
204 algo = pk->algo;
205
206 /*
207 * now write packet
208 */
210 if (res < 0)
211 goto err;
212 res = pushf_write(pkt, &ver, 1);
213 if (res < 0)
214 goto err;
215 res = pushf_write(pkt, pk->key_id, 8);
216 if (res < 0)
217 goto err;
218 res = pushf_write(pkt, &algo, 1);
219 if (res < 0)
220 goto err;
221
222 switch (algo)
223 {
225 res = encrypt_and_write_elgamal(ctx, pk, pkt);
226 break;
229 res = encrypt_and_write_rsa(ctx, pk, pkt);
230 break;
231 }
232 if (res < 0)
233 goto err;
234
235 /*
236 * done, signal packet end
237 */
238 res = pushf_flush(pkt);
239err:
240 if (pkt)
241 pushf_free(pkt);
242
243 return res;
244}
int pushf_write(PushFilter *mp, const uint8 *data, int len)
Definition: mbuf.c:439
int pushf_flush(PushFilter *mp)
Definition: mbuf.c:499
void pushf_free(PushFilter *mp)
Definition: mbuf.c:395
int pgp_create_pkt_writer(PushFilter *dst, int tag, PushFilter **res_p)
Definition: pgp-encrypt.c:311
static int encrypt_and_write_elgamal(PGP_Context *ctx, PGP_PubKey *pk, PushFilter *pkt)
Definition: pgp-pubenc.c:133
static int encrypt_and_write_rsa(PGP_Context *ctx, PGP_PubKey *pk, PushFilter *pkt)
Definition: pgp-pubenc.c:164
@ PGP_PKT_PUBENCRYPTED_SESSKEY
Definition: pgp.h:47
@ PGP_PUB_RSA_ENCRYPT_SIGN
Definition: pgp.h:68
@ PGP_PUB_RSA_ENCRYPT
Definition: pgp.h:69
@ PGP_PUB_ELG_ENCRYPT
Definition: pgp.h:71
void px_debug(const char *fmt,...)
Definition: px.c:149
PGP_PubKey * pub_key
Definition: pgp.h:164
Definition: pgp.h:187
uint8 key_id[8]
Definition: pgp.h:235
uint8 algo
Definition: pgp.h:190
Definition: mbuf.c:347

References PGP_PubKey::algo, encrypt_and_write_elgamal(), encrypt_and_write_rsa(), err(), PGP_PubKey::key_id, pgp_create_pkt_writer(), PGP_PKT_PUBENCRYPTED_SESSKEY, PGP_PUB_ELG_ENCRYPT, PGP_PUB_RSA_ENCRYPT, PGP_PUB_RSA_ENCRYPT_SIGN, PGP_Context::pub_key, pushf_flush(), pushf_free(), pushf_write(), px_debug(), and PXE_BUG.

Referenced by pgp_encrypt().

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