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-rw-r--r--contrib/pgcrypto/openssl.c821
1 files changed, 821 insertions, 0 deletions
diff --git a/contrib/pgcrypto/openssl.c b/contrib/pgcrypto/openssl.c
new file mode 100644
index 0000000..e236b0d
--- /dev/null
+++ b/contrib/pgcrypto/openssl.c
@@ -0,0 +1,821 @@
+/*
+ * openssl.c
+ * Wrapper for OpenSSL library.
+ *
+ * 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/openssl.c
+ */
+
+#include "postgres.h"
+
+#include <openssl/evp.h>
+#include <openssl/err.h>
+#include <openssl/rand.h>
+
+#include "px.h"
+#include "utils/memutils.h"
+#include "utils/resowner.h"
+
+/*
+ * Max lengths we might want to handle.
+ */
+#define MAX_KEY (512/8)
+#define MAX_IV (128/8)
+
+/*
+ * Hashes
+ */
+
+/*
+ * To make sure we don't leak OpenSSL handles on abort, we keep OSSLDigest
+ * objects in a linked list, allocated in TopMemoryContext. We use the
+ * ResourceOwner mechanism to free them on abort.
+ */
+typedef struct OSSLDigest
+{
+ const EVP_MD *algo;
+ EVP_MD_CTX *ctx;
+
+ ResourceOwner owner;
+ struct OSSLDigest *next;
+ struct OSSLDigest *prev;
+} OSSLDigest;
+
+static OSSLDigest *open_digests = NULL;
+static bool digest_resowner_callback_registered = false;
+
+static void
+free_openssl_digest(OSSLDigest *digest)
+{
+ EVP_MD_CTX_destroy(digest->ctx);
+ if (digest->prev)
+ digest->prev->next = digest->next;
+ else
+ open_digests = digest->next;
+ if (digest->next)
+ digest->next->prev = digest->prev;
+ pfree(digest);
+}
+
+/*
+ * Close any open OpenSSL handles on abort.
+ */
+static void
+digest_free_callback(ResourceReleasePhase phase,
+ bool isCommit,
+ bool isTopLevel,
+ void *arg)
+{
+ OSSLDigest *curr;
+ OSSLDigest *next;
+
+ if (phase != RESOURCE_RELEASE_AFTER_LOCKS)
+ return;
+
+ next = open_digests;
+ while (next)
+ {
+ curr = next;
+ next = curr->next;
+
+ if (curr->owner == CurrentResourceOwner)
+ {
+ if (isCommit)
+ elog(WARNING, "pgcrypto digest reference leak: digest %p still referenced", curr);
+ free_openssl_digest(curr);
+ }
+ }
+}
+
+static unsigned
+digest_result_size(PX_MD *h)
+{
+ OSSLDigest *digest = (OSSLDigest *) h->p.ptr;
+ int result = EVP_MD_CTX_size(digest->ctx);
+
+ if (result < 0)
+ elog(ERROR, "EVP_MD_CTX_size() failed");
+
+ return result;
+}
+
+static unsigned
+digest_block_size(PX_MD *h)
+{
+ OSSLDigest *digest = (OSSLDigest *) h->p.ptr;
+ int result = EVP_MD_CTX_block_size(digest->ctx);
+
+ if (result < 0)
+ elog(ERROR, "EVP_MD_CTX_block_size() failed");
+
+ return result;
+}
+
+static void
+digest_reset(PX_MD *h)
+{
+ OSSLDigest *digest = (OSSLDigest *) h->p.ptr;
+
+ if (!EVP_DigestInit_ex(digest->ctx, digest->algo, NULL))
+ elog(ERROR, "EVP_DigestInit_ex() failed");
+}
+
+static void
+digest_update(PX_MD *h, const uint8 *data, unsigned dlen)
+{
+ OSSLDigest *digest = (OSSLDigest *) h->p.ptr;
+
+ if (!EVP_DigestUpdate(digest->ctx, data, dlen))
+ elog(ERROR, "EVP_DigestUpdate() failed");
+}
+
+static void
+digest_finish(PX_MD *h, uint8 *dst)
+{
+ OSSLDigest *digest = (OSSLDigest *) h->p.ptr;
+
+ if (!EVP_DigestFinal_ex(digest->ctx, dst, NULL))
+ elog(ERROR, "EVP_DigestFinal_ex() failed");
+}
+
+static void
+digest_free(PX_MD *h)
+{
+ OSSLDigest *digest = (OSSLDigest *) h->p.ptr;
+
+ free_openssl_digest(digest);
+ pfree(h);
+}
+
+static int px_openssl_initialized = 0;
+
+/* PUBLIC functions */
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+ const EVP_MD *md;
+ EVP_MD_CTX *ctx;
+ PX_MD *h;
+ OSSLDigest *digest;
+
+ if (!px_openssl_initialized)
+ {
+ px_openssl_initialized = 1;
+ OpenSSL_add_all_algorithms();
+ }
+
+ if (!digest_resowner_callback_registered)
+ {
+ RegisterResourceReleaseCallback(digest_free_callback, NULL);
+ digest_resowner_callback_registered = true;
+ }
+
+ md = EVP_get_digestbyname(name);
+ if (md == NULL)
+ return PXE_NO_HASH;
+
+ /*
+ * Create an OSSLDigest object, an OpenSSL MD object, and a PX_MD object.
+ * The order is crucial, to make sure we don't leak anything on
+ * out-of-memory or other error.
+ */
+ digest = MemoryContextAlloc(TopMemoryContext, sizeof(*digest));
+
+ ctx = EVP_MD_CTX_create();
+ if (!ctx)
+ {
+ pfree(digest);
+ return -1;
+ }
+ if (EVP_DigestInit_ex(ctx, md, NULL) == 0)
+ {
+ EVP_MD_CTX_destroy(ctx);
+ pfree(digest);
+ return -1;
+ }
+
+ digest->algo = md;
+ digest->ctx = ctx;
+ digest->owner = CurrentResourceOwner;
+ digest->next = open_digests;
+ digest->prev = NULL;
+ open_digests = digest;
+
+ /* The PX_MD object is allocated in the current memory context. */
+ h = palloc(sizeof(*h));
+ h->result_size = digest_result_size;
+ h->block_size = digest_block_size;
+ h->reset = digest_reset;
+ h->update = digest_update;
+ h->finish = digest_finish;
+ h->free = digest_free;
+ h->p.ptr = (void *) digest;
+
+ *res = h;
+ return 0;
+}
+
+/*
+ * Ciphers
+ *
+ * We use OpenSSL's EVP* family of functions for these.
+ */
+
+/*
+ * prototype for the EVP functions that return an algorithm, e.g.
+ * EVP_aes_128_cbc().
+ */
+typedef const EVP_CIPHER *(*ossl_EVP_cipher_func) (void);
+
+/*
+ * ossl_cipher contains the static information about each cipher.
+ */
+struct ossl_cipher
+{
+ int (*init) (PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv);
+ ossl_EVP_cipher_func cipher_func;
+ int block_size;
+ int max_key_size;
+};
+
+/*
+ * OSSLCipher contains the state for using a cipher. A separate OSSLCipher
+ * object is allocated in each px_find_cipher() call.
+ *
+ * To make sure we don't leak OpenSSL handles on abort, we keep OSSLCipher
+ * objects in a linked list, allocated in TopMemoryContext. We use the
+ * ResourceOwner mechanism to free them on abort.
+ */
+typedef struct OSSLCipher
+{
+ EVP_CIPHER_CTX *evp_ctx;
+ const EVP_CIPHER *evp_ciph;
+ uint8 key[MAX_KEY];
+ uint8 iv[MAX_IV];
+ unsigned klen;
+ unsigned init;
+ const struct ossl_cipher *ciph;
+
+ ResourceOwner owner;
+ struct OSSLCipher *next;
+ struct OSSLCipher *prev;
+} OSSLCipher;
+
+static OSSLCipher *open_ciphers = NULL;
+static bool cipher_resowner_callback_registered = false;
+
+static void
+free_openssl_cipher(OSSLCipher *od)
+{
+ EVP_CIPHER_CTX_free(od->evp_ctx);
+ if (od->prev)
+ od->prev->next = od->next;
+ else
+ open_ciphers = od->next;
+ if (od->next)
+ od->next->prev = od->prev;
+ pfree(od);
+}
+
+/*
+ * Close any open OpenSSL cipher handles on abort.
+ */
+static void
+cipher_free_callback(ResourceReleasePhase phase,
+ bool isCommit,
+ bool isTopLevel,
+ void *arg)
+{
+ OSSLCipher *curr;
+ OSSLCipher *next;
+
+ if (phase != RESOURCE_RELEASE_AFTER_LOCKS)
+ return;
+
+ next = open_ciphers;
+ while (next)
+ {
+ curr = next;
+ next = curr->next;
+
+ if (curr->owner == CurrentResourceOwner)
+ {
+ if (isCommit)
+ elog(WARNING, "pgcrypto cipher reference leak: cipher %p still referenced", curr);
+ free_openssl_cipher(curr);
+ }
+ }
+}
+
+/* Common routines for all algorithms */
+
+static unsigned
+gen_ossl_block_size(PX_Cipher *c)
+{
+ OSSLCipher *od = (OSSLCipher *) c->ptr;
+
+ return od->ciph->block_size;
+}
+
+static unsigned
+gen_ossl_key_size(PX_Cipher *c)
+{
+ OSSLCipher *od = (OSSLCipher *) c->ptr;
+
+ return od->ciph->max_key_size;
+}
+
+static unsigned
+gen_ossl_iv_size(PX_Cipher *c)
+{
+ unsigned ivlen;
+ OSSLCipher *od = (OSSLCipher *) c->ptr;
+
+ ivlen = od->ciph->block_size;
+ return ivlen;
+}
+
+static void
+gen_ossl_free(PX_Cipher *c)
+{
+ OSSLCipher *od = (OSSLCipher *) c->ptr;
+
+ free_openssl_cipher(od);
+ pfree(c);
+}
+
+static int
+gen_ossl_decrypt(PX_Cipher *c, const uint8 *data, unsigned dlen,
+ uint8 *res)
+{
+ OSSLCipher *od = c->ptr;
+ int outlen;
+
+ if (!od->init)
+ {
+ if (!EVP_DecryptInit_ex(od->evp_ctx, od->evp_ciph, NULL, NULL, NULL))
+ return PXE_CIPHER_INIT;
+ if (!EVP_CIPHER_CTX_set_padding(od->evp_ctx, 0))
+ return PXE_CIPHER_INIT;
+ if (!EVP_CIPHER_CTX_set_key_length(od->evp_ctx, od->klen))
+ return PXE_CIPHER_INIT;
+ if (!EVP_DecryptInit_ex(od->evp_ctx, NULL, NULL, od->key, od->iv))
+ return PXE_CIPHER_INIT;
+ od->init = true;
+ }
+
+ if (!EVP_DecryptUpdate(od->evp_ctx, res, &outlen, data, dlen))
+ return PXE_DECRYPT_FAILED;
+
+ return 0;
+}
+
+static int
+gen_ossl_encrypt(PX_Cipher *c, const uint8 *data, unsigned dlen,
+ uint8 *res)
+{
+ OSSLCipher *od = c->ptr;
+ int outlen;
+
+ if (!od->init)
+ {
+ if (!EVP_EncryptInit_ex(od->evp_ctx, od->evp_ciph, NULL, NULL, NULL))
+ return PXE_CIPHER_INIT;
+ if (!EVP_CIPHER_CTX_set_padding(od->evp_ctx, 0))
+ return PXE_CIPHER_INIT;
+ if (!EVP_CIPHER_CTX_set_key_length(od->evp_ctx, od->klen))
+ return PXE_CIPHER_INIT;
+ if (!EVP_EncryptInit_ex(od->evp_ctx, NULL, NULL, od->key, od->iv))
+ return PXE_CIPHER_INIT;
+ od->init = true;
+ }
+
+ if (!EVP_EncryptUpdate(od->evp_ctx, res, &outlen, data, dlen))
+ return PXE_ENCRYPT_FAILED;
+
+ return 0;
+}
+
+/* Blowfish */
+
+/*
+ * Check if strong crypto is supported. Some OpenSSL installations
+ * support only short keys and unfortunately BF_set_key does not return any
+ * error value. This function tests if is possible to use strong key.
+ */
+static int
+bf_check_supported_key_len(void)
+{
+ static const uint8 key[56] = {
+ 0xf0, 0xe1, 0xd2, 0xc3, 0xb4, 0xa5, 0x96, 0x87, 0x78, 0x69,
+ 0x5a, 0x4b, 0x3c, 0x2d, 0x1e, 0x0f, 0x00, 0x11, 0x22, 0x33,
+ 0x44, 0x55, 0x66, 0x77, 0x04, 0x68, 0x91, 0x04, 0xc2, 0xfd,
+ 0x3b, 0x2f, 0x58, 0x40, 0x23, 0x64, 0x1a, 0xba, 0x61, 0x76,
+ 0x1f, 0x1f, 0x1f, 0x1f, 0x0e, 0x0e, 0x0e, 0x0e, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
+ };
+
+ static const uint8 data[8] = {0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10};
+ static const uint8 res[8] = {0xc0, 0x45, 0x04, 0x01, 0x2e, 0x4e, 0x1f, 0x53};
+ uint8 out[8];
+ EVP_CIPHER_CTX *evp_ctx;
+ int outlen;
+ int status = 0;
+
+ /* encrypt with 448bits key and verify output */
+ evp_ctx = EVP_CIPHER_CTX_new();
+ if (!evp_ctx)
+ return 0;
+ if (!EVP_EncryptInit_ex(evp_ctx, EVP_bf_ecb(), NULL, NULL, NULL))
+ goto leave;
+ if (!EVP_CIPHER_CTX_set_key_length(evp_ctx, 56))
+ goto leave;
+ if (!EVP_EncryptInit_ex(evp_ctx, NULL, NULL, key, NULL))
+ goto leave;
+
+ if (!EVP_EncryptUpdate(evp_ctx, out, &outlen, data, 8))
+ goto leave;
+
+ if (memcmp(out, res, 8) != 0)
+ goto leave; /* Output does not match -> strong cipher is
+ * not supported */
+ status = 1;
+
+leave:
+ EVP_CIPHER_CTX_free(evp_ctx);
+ return status;
+}
+
+static int
+bf_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+ OSSLCipher *od = c->ptr;
+ unsigned bs = gen_ossl_block_size(c);
+ static int bf_is_strong = -1;
+
+ /*
+ * Test if key len is supported. BF_set_key silently cut large keys and it
+ * could be a problem when user transfer crypted data from one server to
+ * another.
+ */
+
+ if (bf_is_strong == -1)
+ bf_is_strong = bf_check_supported_key_len();
+
+ if (!bf_is_strong && klen > 16)
+ return PXE_KEY_TOO_BIG;
+
+ /* Key len is supported. We can use it. */
+ od->klen = klen;
+ memcpy(od->key, key, klen);
+
+ if (iv)
+ memcpy(od->iv, iv, bs);
+ else
+ memset(od->iv, 0, bs);
+ return 0;
+}
+
+/* DES */
+
+static int
+ossl_des_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+ OSSLCipher *od = c->ptr;
+ unsigned bs = gen_ossl_block_size(c);
+
+ od->klen = 8;
+ memset(od->key, 0, 8);
+ memcpy(od->key, key, klen > 8 ? 8 : klen);
+
+ if (iv)
+ memcpy(od->iv, iv, bs);
+ else
+ memset(od->iv, 0, bs);
+ return 0;
+}
+
+/* DES3 */
+
+static int
+ossl_des3_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+ OSSLCipher *od = c->ptr;
+ unsigned bs = gen_ossl_block_size(c);
+
+ od->klen = 24;
+ memset(od->key, 0, 24);
+ memcpy(od->key, key, klen > 24 ? 24 : klen);
+
+ if (iv)
+ memcpy(od->iv, iv, bs);
+ else
+ memset(od->iv, 0, bs);
+ return 0;
+}
+
+/* CAST5 */
+
+static int
+ossl_cast_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+ OSSLCipher *od = c->ptr;
+ unsigned bs = gen_ossl_block_size(c);
+
+ od->klen = klen;
+ memcpy(od->key, key, klen);
+
+ if (iv)
+ memcpy(od->iv, iv, bs);
+ else
+ memset(od->iv, 0, bs);
+ return 0;
+}
+
+/* AES */
+
+static int
+ossl_aes_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+ OSSLCipher *od = c->ptr;
+ unsigned bs = gen_ossl_block_size(c);
+
+ if (klen <= 128 / 8)
+ od->klen = 128 / 8;
+ else if (klen <= 192 / 8)
+ od->klen = 192 / 8;
+ else if (klen <= 256 / 8)
+ od->klen = 256 / 8;
+ else
+ return PXE_KEY_TOO_BIG;
+
+ memcpy(od->key, key, klen);
+
+ if (iv)
+ memcpy(od->iv, iv, bs);
+ else
+ memset(od->iv, 0, bs);
+
+ return 0;
+}
+
+static int
+ossl_aes_ecb_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+ OSSLCipher *od = c->ptr;
+ int err;
+
+ err = ossl_aes_init(c, key, klen, iv);
+ if (err)
+ return err;
+
+ switch (od->klen)
+ {
+ case 128 / 8:
+ od->evp_ciph = EVP_aes_128_ecb();
+ break;
+ case 192 / 8:
+ od->evp_ciph = EVP_aes_192_ecb();
+ break;
+ case 256 / 8:
+ od->evp_ciph = EVP_aes_256_ecb();
+ break;
+ default:
+ /* shouldn't happen */
+ err = PXE_CIPHER_INIT;
+ break;
+ }
+
+ return err;
+}
+
+static int
+ossl_aes_cbc_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+ OSSLCipher *od = c->ptr;
+ int err;
+
+ err = ossl_aes_init(c, key, klen, iv);
+ if (err)
+ return err;
+
+ switch (od->klen)
+ {
+ case 128 / 8:
+ od->evp_ciph = EVP_aes_128_cbc();
+ break;
+ case 192 / 8:
+ od->evp_ciph = EVP_aes_192_cbc();
+ break;
+ case 256 / 8:
+ od->evp_ciph = EVP_aes_256_cbc();
+ break;
+ default:
+ /* shouldn't happen */
+ err = PXE_CIPHER_INIT;
+ break;
+ }
+
+ return err;
+}
+
+/*
+ * aliases
+ */
+
+static PX_Alias ossl_aliases[] = {
+ {"bf", "bf-cbc"},
+ {"blowfish", "bf-cbc"},
+ {"blowfish-cbc", "bf-cbc"},
+ {"blowfish-ecb", "bf-ecb"},
+ {"blowfish-cfb", "bf-cfb"},
+ {"des", "des-cbc"},
+ {"3des", "des3-cbc"},
+ {"3des-ecb", "des3-ecb"},
+ {"3des-cbc", "des3-cbc"},
+ {"cast5", "cast5-cbc"},
+ {"aes", "aes-cbc"},
+ {"rijndael", "aes-cbc"},
+ {"rijndael-cbc", "aes-cbc"},
+ {"rijndael-ecb", "aes-ecb"},
+ {NULL}
+};
+
+static const struct ossl_cipher ossl_bf_cbc = {
+ bf_init,
+ EVP_bf_cbc,
+ 64 / 8, 448 / 8
+};
+
+static const struct ossl_cipher ossl_bf_ecb = {
+ bf_init,
+ EVP_bf_ecb,
+ 64 / 8, 448 / 8
+};
+
+static const struct ossl_cipher ossl_bf_cfb = {
+ bf_init,
+ EVP_bf_cfb,
+ 64 / 8, 448 / 8
+};
+
+static const struct ossl_cipher ossl_des_ecb = {
+ ossl_des_init,
+ EVP_des_ecb,
+ 64 / 8, 64 / 8
+};
+
+static const struct ossl_cipher ossl_des_cbc = {
+ ossl_des_init,
+ EVP_des_cbc,
+ 64 / 8, 64 / 8
+};
+
+static const struct ossl_cipher ossl_des3_ecb = {
+ ossl_des3_init,
+ EVP_des_ede3_ecb,
+ 64 / 8, 192 / 8
+};
+
+static const struct ossl_cipher ossl_des3_cbc = {
+ ossl_des3_init,
+ EVP_des_ede3_cbc,
+ 64 / 8, 192 / 8
+};
+
+static const struct ossl_cipher ossl_cast_ecb = {
+ ossl_cast_init,
+ EVP_cast5_ecb,
+ 64 / 8, 128 / 8
+};
+
+static const struct ossl_cipher ossl_cast_cbc = {
+ ossl_cast_init,
+ EVP_cast5_cbc,
+ 64 / 8, 128 / 8
+};
+
+static const struct ossl_cipher ossl_aes_ecb = {
+ ossl_aes_ecb_init,
+ NULL, /* EVP_aes_XXX_ecb(), determined in init
+ * function */
+ 128 / 8, 256 / 8
+};
+
+static const struct ossl_cipher ossl_aes_cbc = {
+ ossl_aes_cbc_init,
+ NULL, /* EVP_aes_XXX_cbc(), determined in init
+ * function */
+ 128 / 8, 256 / 8
+};
+
+/*
+ * Special handlers
+ */
+struct ossl_cipher_lookup
+{
+ const char *name;
+ const struct ossl_cipher *ciph;
+};
+
+static const struct ossl_cipher_lookup ossl_cipher_types[] = {
+ {"bf-cbc", &ossl_bf_cbc},
+ {"bf-ecb", &ossl_bf_ecb},
+ {"bf-cfb", &ossl_bf_cfb},
+ {"des-ecb", &ossl_des_ecb},
+ {"des-cbc", &ossl_des_cbc},
+ {"des3-ecb", &ossl_des3_ecb},
+ {"des3-cbc", &ossl_des3_cbc},
+ {"cast5-ecb", &ossl_cast_ecb},
+ {"cast5-cbc", &ossl_cast_cbc},
+ {"aes-ecb", &ossl_aes_ecb},
+ {"aes-cbc", &ossl_aes_cbc},
+ {NULL}
+};
+
+/* PUBLIC functions */
+
+int
+px_find_cipher(const char *name, PX_Cipher **res)
+{
+ const struct ossl_cipher_lookup *i;
+ PX_Cipher *c = NULL;
+ EVP_CIPHER_CTX *ctx;
+ OSSLCipher *od;
+
+ name = px_resolve_alias(ossl_aliases, name);
+ for (i = ossl_cipher_types; i->name; i++)
+ if (strcmp(i->name, name) == 0)
+ break;
+ if (i->name == NULL)
+ return PXE_NO_CIPHER;
+
+ if (!cipher_resowner_callback_registered)
+ {
+ RegisterResourceReleaseCallback(cipher_free_callback, NULL);
+ cipher_resowner_callback_registered = true;
+ }
+
+ /*
+ * Create an OSSLCipher object, an EVP_CIPHER_CTX object and a PX_Cipher.
+ * The order is crucial, to make sure we don't leak anything on
+ * out-of-memory or other error.
+ */
+ od = MemoryContextAllocZero(TopMemoryContext, sizeof(*od));
+ od->ciph = i->ciph;
+
+ /* Allocate an EVP_CIPHER_CTX object. */
+ ctx = EVP_CIPHER_CTX_new();
+ if (!ctx)
+ {
+ pfree(od);
+ return PXE_CIPHER_INIT;
+ }
+
+ od->evp_ctx = ctx;
+ od->owner = CurrentResourceOwner;
+ od->next = open_ciphers;
+ od->prev = NULL;
+ open_ciphers = od;
+
+ if (i->ciph->cipher_func)
+ od->evp_ciph = i->ciph->cipher_func();
+
+ /* The PX_Cipher is allocated in current memory context */
+ c = palloc(sizeof(*c));
+ c->block_size = gen_ossl_block_size;
+ c->key_size = gen_ossl_key_size;
+ c->iv_size = gen_ossl_iv_size;
+ c->free = gen_ossl_free;
+ c->init = od->ciph->init;
+ c->encrypt = gen_ossl_encrypt;
+ c->decrypt = gen_ossl_decrypt;
+ c->ptr = od;
+
+ *res = c;
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 05:28:37 +0000