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-rw-r--r--contrib/pgcrypto/internal.c597
1 files changed, 597 insertions, 0 deletions
diff --git a/contrib/pgcrypto/internal.c b/contrib/pgcrypto/internal.c
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+/*
+ * internal.c
+ * Wrapper for builtin functions
+ *
+ * Copyright (c) 2001 Marko Kreen
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * contrib/pgcrypto/internal.c
+ */
+
+#include "postgres.h"
+
+#include <time.h>
+
+#include "blf.h"
+#include "md5.h"
+#include "px.h"
+#include "rijndael.h"
+#include "sha1.h"
+
+#ifndef MD5_DIGEST_LENGTH
+#define MD5_DIGEST_LENGTH 16
+#endif
+
+#ifndef SHA1_DIGEST_LENGTH
+#ifdef SHA1_RESULTLEN
+#define SHA1_DIGEST_LENGTH SHA1_RESULTLEN
+#else
+#define SHA1_DIGEST_LENGTH 20
+#endif
+#endif
+
+#define SHA1_BLOCK_SIZE 64
+#define MD5_BLOCK_SIZE 64
+
+static void init_md5(PX_MD *h);
+static void init_sha1(PX_MD *h);
+
+void init_sha224(PX_MD *h);
+void init_sha256(PX_MD *h);
+void init_sha384(PX_MD *h);
+void init_sha512(PX_MD *h);
+
+struct int_digest
+{
+ char *name;
+ void (*init) (PX_MD *h);
+};
+
+static const struct int_digest
+ int_digest_list[] = {
+ {"md5", init_md5},
+ {"sha1", init_sha1},
+ {"sha224", init_sha224},
+ {"sha256", init_sha256},
+ {"sha384", init_sha384},
+ {"sha512", init_sha512},
+ {NULL, NULL}
+};
+
+/* MD5 */
+
+static unsigned
+int_md5_len(PX_MD *h)
+{
+ return MD5_DIGEST_LENGTH;
+}
+
+static unsigned
+int_md5_block_len(PX_MD *h)
+{
+ return MD5_BLOCK_SIZE;
+}
+
+static void
+int_md5_update(PX_MD *h, const uint8 *data, unsigned dlen)
+{
+ MD5_CTX *ctx = (MD5_CTX *) h->p.ptr;
+
+ MD5Update(ctx, data, dlen);
+}
+
+static void
+int_md5_reset(PX_MD *h)
+{
+ MD5_CTX *ctx = (MD5_CTX *) h->p.ptr;
+
+ MD5Init(ctx);
+}
+
+static void
+int_md5_finish(PX_MD *h, uint8 *dst)
+{
+ MD5_CTX *ctx = (MD5_CTX *) h->p.ptr;
+
+ MD5Final(dst, ctx);
+}
+
+static void
+int_md5_free(PX_MD *h)
+{
+ MD5_CTX *ctx = (MD5_CTX *) h->p.ptr;
+
+ px_memset(ctx, 0, sizeof(*ctx));
+ px_free(ctx);
+ px_free(h);
+}
+
+/* SHA1 */
+
+static unsigned
+int_sha1_len(PX_MD *h)
+{
+ return SHA1_DIGEST_LENGTH;
+}
+
+static unsigned
+int_sha1_block_len(PX_MD *h)
+{
+ return SHA1_BLOCK_SIZE;
+}
+
+static void
+int_sha1_update(PX_MD *h, const uint8 *data, unsigned dlen)
+{
+ SHA1_CTX *ctx = (SHA1_CTX *) h->p.ptr;
+
+ SHA1Update(ctx, data, dlen);
+}
+
+static void
+int_sha1_reset(PX_MD *h)
+{
+ SHA1_CTX *ctx = (SHA1_CTX *) h->p.ptr;
+
+ SHA1Init(ctx);
+}
+
+static void
+int_sha1_finish(PX_MD *h, uint8 *dst)
+{
+ SHA1_CTX *ctx = (SHA1_CTX *) h->p.ptr;
+
+ SHA1Final(dst, ctx);
+}
+
+static void
+int_sha1_free(PX_MD *h)
+{
+ SHA1_CTX *ctx = (SHA1_CTX *) h->p.ptr;
+
+ px_memset(ctx, 0, sizeof(*ctx));
+ px_free(ctx);
+ px_free(h);
+}
+
+/* init functions */
+
+static void
+init_md5(PX_MD *md)
+{
+ MD5_CTX *ctx;
+
+ ctx = px_alloc(sizeof(*ctx));
+ memset(ctx, 0, sizeof(*ctx));
+
+ md->p.ptr = ctx;
+
+ md->result_size = int_md5_len;
+ md->block_size = int_md5_block_len;
+ md->reset = int_md5_reset;
+ md->update = int_md5_update;
+ md->finish = int_md5_finish;
+ md->free = int_md5_free;
+
+ md->reset(md);
+}
+
+static void
+init_sha1(PX_MD *md)
+{
+ SHA1_CTX *ctx;
+
+ ctx = px_alloc(sizeof(*ctx));
+ memset(ctx, 0, sizeof(*ctx));
+
+ md->p.ptr = ctx;
+
+ md->result_size = int_sha1_len;
+ md->block_size = int_sha1_block_len;
+ md->reset = int_sha1_reset;
+ md->update = int_sha1_update;
+ md->finish = int_sha1_finish;
+ md->free = int_sha1_free;
+
+ md->reset(md);
+}
+
+/*
+ * ciphers generally
+ */
+
+#define INT_MAX_KEY (512/8)
+#define INT_MAX_IV (128/8)
+
+struct int_ctx
+{
+ uint8 keybuf[INT_MAX_KEY];
+ uint8 iv[INT_MAX_IV];
+ union
+ {
+ BlowfishContext bf;
+ rijndael_ctx rj;
+ } ctx;
+ unsigned keylen;
+ int is_init;
+ int mode;
+};
+
+static void
+intctx_free(PX_Cipher *c)
+{
+ struct int_ctx *cx = (struct int_ctx *) c->ptr;
+
+ if (cx)
+ {
+ px_memset(cx, 0, sizeof *cx);
+ px_free(cx);
+ }
+ px_free(c);
+}
+
+/*
+ * AES/rijndael
+ */
+
+#define MODE_ECB 0
+#define MODE_CBC 1
+
+static unsigned
+rj_block_size(PX_Cipher *c)
+{
+ return 128 / 8;
+}
+
+static unsigned
+rj_key_size(PX_Cipher *c)
+{
+ return 256 / 8;
+}
+
+static unsigned
+rj_iv_size(PX_Cipher *c)
+{
+ return 128 / 8;
+}
+
+static int
+rj_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+ struct int_ctx *cx = (struct int_ctx *) c->ptr;
+
+ if (klen <= 128 / 8)
+ cx->keylen = 128 / 8;
+ else if (klen <= 192 / 8)
+ cx->keylen = 192 / 8;
+ else if (klen <= 256 / 8)
+ cx->keylen = 256 / 8;
+ else
+ return PXE_KEY_TOO_BIG;
+
+ memcpy(&cx->keybuf, key, klen);
+
+ if (iv)
+ memcpy(cx->iv, iv, 128 / 8);
+
+ return 0;
+}
+
+static int
+rj_real_init(struct int_ctx *cx, int dir)
+{
+ aes_set_key(&cx->ctx.rj, cx->keybuf, cx->keylen * 8, dir);
+ return 0;
+}
+
+static int
+rj_encrypt(PX_Cipher *c, const uint8 *data, unsigned dlen, uint8 *res)
+{
+ struct int_ctx *cx = (struct int_ctx *) c->ptr;
+
+ if (!cx->is_init)
+ {
+ if (rj_real_init(cx, 1))
+ return PXE_CIPHER_INIT;
+ }
+
+ if (dlen == 0)
+ return 0;
+
+ if (dlen & 15)
+ return PXE_NOTBLOCKSIZE;
+
+ memcpy(res, data, dlen);
+
+ if (cx->mode == MODE_CBC)
+ {
+ aes_cbc_encrypt(&cx->ctx.rj, cx->iv, res, dlen);
+ memcpy(cx->iv, res + dlen - 16, 16);
+ }
+ else
+ aes_ecb_encrypt(&cx->ctx.rj, res, dlen);
+
+ return 0;
+}
+
+static int
+rj_decrypt(PX_Cipher *c, const uint8 *data, unsigned dlen, uint8 *res)
+{
+ struct int_ctx *cx = (struct int_ctx *) c->ptr;
+
+ if (!cx->is_init)
+ if (rj_real_init(cx, 0))
+ return PXE_CIPHER_INIT;
+
+ if (dlen == 0)
+ return 0;
+
+ if (dlen & 15)
+ return PXE_NOTBLOCKSIZE;
+
+ memcpy(res, data, dlen);
+
+ if (cx->mode == MODE_CBC)
+ {
+ aes_cbc_decrypt(&cx->ctx.rj, cx->iv, res, dlen);
+ memcpy(cx->iv, data + dlen - 16, 16);
+ }
+ else
+ aes_ecb_decrypt(&cx->ctx.rj, res, dlen);
+
+ return 0;
+}
+
+/*
+ * initializers
+ */
+
+static PX_Cipher *
+rj_load(int mode)
+{
+ PX_Cipher *c;
+ struct int_ctx *cx;
+
+ c = px_alloc(sizeof *c);
+ memset(c, 0, sizeof *c);
+
+ c->block_size = rj_block_size;
+ c->key_size = rj_key_size;
+ c->iv_size = rj_iv_size;
+ c->init = rj_init;
+ c->encrypt = rj_encrypt;
+ c->decrypt = rj_decrypt;
+ c->free = intctx_free;
+
+ cx = px_alloc(sizeof *cx);
+ memset(cx, 0, sizeof *cx);
+ cx->mode = mode;
+
+ c->ptr = cx;
+ return c;
+}
+
+/*
+ * blowfish
+ */
+
+static unsigned
+bf_block_size(PX_Cipher *c)
+{
+ return 8;
+}
+
+static unsigned
+bf_key_size(PX_Cipher *c)
+{
+ return 448 / 8;
+}
+
+static unsigned
+bf_iv_size(PX_Cipher *c)
+{
+ return 8;
+}
+
+static int
+bf_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+ struct int_ctx *cx = (struct int_ctx *) c->ptr;
+
+ blowfish_setkey(&cx->ctx.bf, key, klen);
+ if (iv)
+ blowfish_setiv(&cx->ctx.bf, iv);
+
+ return 0;
+}
+
+static int
+bf_encrypt(PX_Cipher *c, const uint8 *data, unsigned dlen, uint8 *res)
+{
+ struct int_ctx *cx = (struct int_ctx *) c->ptr;
+ BlowfishContext *bfctx = &cx->ctx.bf;
+
+ if (dlen == 0)
+ return 0;
+
+ if (dlen & 7)
+ return PXE_NOTBLOCKSIZE;
+
+ memcpy(res, data, dlen);
+ switch (cx->mode)
+ {
+ case MODE_ECB:
+ blowfish_encrypt_ecb(res, dlen, bfctx);
+ break;
+ case MODE_CBC:
+ blowfish_encrypt_cbc(res, dlen, bfctx);
+ break;
+ }
+ return 0;
+}
+
+static int
+bf_decrypt(PX_Cipher *c, const uint8 *data, unsigned dlen, uint8 *res)
+{
+ struct int_ctx *cx = (struct int_ctx *) c->ptr;
+ BlowfishContext *bfctx = &cx->ctx.bf;
+
+ if (dlen == 0)
+ return 0;
+
+ if (dlen & 7)
+ return PXE_NOTBLOCKSIZE;
+
+ memcpy(res, data, dlen);
+ switch (cx->mode)
+ {
+ case MODE_ECB:
+ blowfish_decrypt_ecb(res, dlen, bfctx);
+ break;
+ case MODE_CBC:
+ blowfish_decrypt_cbc(res, dlen, bfctx);
+ break;
+ }
+ return 0;
+}
+
+static PX_Cipher *
+bf_load(int mode)
+{
+ PX_Cipher *c;
+ struct int_ctx *cx;
+
+ c = px_alloc(sizeof *c);
+ memset(c, 0, sizeof *c);
+
+ c->block_size = bf_block_size;
+ c->key_size = bf_key_size;
+ c->iv_size = bf_iv_size;
+ c->init = bf_init;
+ c->encrypt = bf_encrypt;
+ c->decrypt = bf_decrypt;
+ c->free = intctx_free;
+
+ cx = px_alloc(sizeof *cx);
+ memset(cx, 0, sizeof *cx);
+ cx->mode = mode;
+ c->ptr = cx;
+ return c;
+}
+
+/* ciphers */
+
+static PX_Cipher *
+rj_128_ecb(void)
+{
+ return rj_load(MODE_ECB);
+}
+
+static PX_Cipher *
+rj_128_cbc(void)
+{
+ return rj_load(MODE_CBC);
+}
+
+static PX_Cipher *
+bf_ecb_load(void)
+{
+ return bf_load(MODE_ECB);
+}
+
+static PX_Cipher *
+bf_cbc_load(void)
+{
+ return bf_load(MODE_CBC);
+}
+
+struct int_cipher
+{
+ char *name;
+ PX_Cipher *(*load) (void);
+};
+
+static const struct int_cipher
+ int_ciphers[] = {
+ {"bf-cbc", bf_cbc_load},
+ {"bf-ecb", bf_ecb_load},
+ {"aes-128-cbc", rj_128_cbc},
+ {"aes-128-ecb", rj_128_ecb},
+ {NULL, NULL}
+};
+
+static const PX_Alias int_aliases[] = {
+ {"bf", "bf-cbc"},
+ {"blowfish", "bf-cbc"},
+ {"aes", "aes-128-cbc"},
+ {"aes-ecb", "aes-128-ecb"},
+ {"aes-cbc", "aes-128-cbc"},
+ {"aes-128", "aes-128-cbc"},
+ {"rijndael", "aes-128-cbc"},
+ {"rijndael-128", "aes-128-cbc"},
+ {NULL, NULL}
+};
+
+/* PUBLIC FUNCTIONS */
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+ const struct int_digest *p;
+ PX_MD *h;
+
+ for (p = int_digest_list; p->name; p++)
+ if (pg_strcasecmp(p->name, name) == 0)
+ {
+ h = px_alloc(sizeof(*h));
+ p->init(h);
+
+ *res = h;
+
+ return 0;
+ }
+ return PXE_NO_HASH;
+}
+
+int
+px_find_cipher(const char *name, PX_Cipher **res)
+{
+ int i;
+ PX_Cipher *c = NULL;
+
+ name = px_resolve_alias(int_aliases, name);
+
+ for (i = 0; int_ciphers[i].name; i++)
+ if (strcmp(int_ciphers[i].name, name) == 0)
+ {
+ c = int_ciphers[i].load();
+ break;
+ }
+
+ if (c == NULL)
+ return PXE_NO_CIPHER;
+
+ *res = c;
+ return 0;
+}
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