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/*-------------------------------------------------------------------------
*
* cryptohash_openssl.c
* Set of wrapper routines on top of OpenSSL to support cryptographic
* hash functions.
*
* This should only be used if code is compiled with OpenSSL support.
*
* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/common/cryptohash_openssl.c
*
*-------------------------------------------------------------------------
*/
#ifndef FRONTEND
#include "postgres.h"
#else
#include "postgres_fe.h"
#endif
#include <openssl/evp.h>
#include "common/cryptohash.h"
#include "common/md5.h"
#include "common/sha1.h"
#include "common/sha2.h"
#ifndef FRONTEND
#include "utils/memutils.h"
#include "utils/resowner.h"
#include "utils/resowner_private.h"
#endif
/*
* In the backend, use an allocation in TopMemoryContext to count for
* resowner cleanup handling. In the frontend, use malloc to be able
* to return a failure status back to the caller.
*/
#ifndef FRONTEND
#define ALLOC(size) MemoryContextAlloc(TopMemoryContext, size)
#define FREE(ptr) pfree(ptr)
#else
#define ALLOC(size) malloc(size)
#define FREE(ptr) free(ptr)
#endif
/*
* Internal pg_cryptohash_ctx structure.
*
* This tracks the resource owner associated to each EVP context data
* for the backend.
*/
struct pg_cryptohash_ctx
{
pg_cryptohash_type type;
EVP_MD_CTX *evpctx;
#ifndef FRONTEND
ResourceOwner resowner;
#endif
};
/*
* pg_cryptohash_create
*
* Allocate a hash context. Returns NULL on failure for an OOM. The
* backend issues an error, without returning.
*/
pg_cryptohash_ctx *
pg_cryptohash_create(pg_cryptohash_type type)
{
pg_cryptohash_ctx *ctx;
/*
* Make sure that the resource owner has space to remember this reference.
* This can error out with "out of memory", so do this before any other
* allocation to avoid leaking.
*/
#ifndef FRONTEND
ResourceOwnerEnlargeCryptoHash(CurrentResourceOwner);
#endif
ctx = ALLOC(sizeof(pg_cryptohash_ctx));
if (ctx == NULL)
return NULL;
memset(ctx, 0, sizeof(pg_cryptohash_ctx));
ctx->type = type;
/*
* Initialization takes care of assigning the correct type for OpenSSL.
*/
ctx->evpctx = EVP_MD_CTX_create();
if (ctx->evpctx == NULL)
{
explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
FREE(ctx);
#ifndef FRONTEND
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
#else
return NULL;
#endif
}
#ifndef FRONTEND
ctx->resowner = CurrentResourceOwner;
ResourceOwnerRememberCryptoHash(CurrentResourceOwner,
PointerGetDatum(ctx));
#endif
return ctx;
}
/*
* pg_cryptohash_init
*
* Initialize a hash context. Returns 0 on success, and -1 on failure.
*/
int
pg_cryptohash_init(pg_cryptohash_ctx *ctx)
{
int status = 0;
if (ctx == NULL)
return -1;
switch (ctx->type)
{
case PG_MD5:
status = EVP_DigestInit_ex(ctx->evpctx, EVP_md5(), NULL);
break;
case PG_SHA1:
status = EVP_DigestInit_ex(ctx->evpctx, EVP_sha1(), NULL);
break;
case PG_SHA224:
status = EVP_DigestInit_ex(ctx->evpctx, EVP_sha224(), NULL);
break;
case PG_SHA256:
status = EVP_DigestInit_ex(ctx->evpctx, EVP_sha256(), NULL);
break;
case PG_SHA384:
status = EVP_DigestInit_ex(ctx->evpctx, EVP_sha384(), NULL);
break;
case PG_SHA512:
status = EVP_DigestInit_ex(ctx->evpctx, EVP_sha512(), NULL);
break;
}
/* OpenSSL internals return 1 on success, 0 on failure */
if (status <= 0)
return -1;
return 0;
}
/*
* pg_cryptohash_update
*
* Update a hash context. Returns 0 on success, and -1 on failure.
*/
int
pg_cryptohash_update(pg_cryptohash_ctx *ctx, const uint8 *data, size_t len)
{
int status = 0;
if (ctx == NULL)
return -1;
status = EVP_DigestUpdate(ctx->evpctx, data, len);
/* OpenSSL internals return 1 on success, 0 on failure */
if (status <= 0)
return -1;
return 0;
}
/*
* pg_cryptohash_final
*
* Finalize a hash context. Returns 0 on success, and -1 on failure.
*/
int
pg_cryptohash_final(pg_cryptohash_ctx *ctx, uint8 *dest, size_t len)
{
int status = 0;
if (ctx == NULL)
return -1;
switch (ctx->type)
{
case PG_MD5:
if (len < MD5_DIGEST_LENGTH)
return -1;
break;
case PG_SHA1:
if (len < SHA1_DIGEST_LENGTH)
return -1;
break;
case PG_SHA224:
if (len < PG_SHA224_DIGEST_LENGTH)
return -1;
break;
case PG_SHA256:
if (len < PG_SHA256_DIGEST_LENGTH)
return -1;
break;
case PG_SHA384:
if (len < PG_SHA384_DIGEST_LENGTH)
return -1;
break;
case PG_SHA512:
if (len < PG_SHA512_DIGEST_LENGTH)
return -1;
break;
}
status = EVP_DigestFinal_ex(ctx->evpctx, dest, 0);
/* OpenSSL internals return 1 on success, 0 on failure */
if (status <= 0)
return -1;
return 0;
}
/*
* pg_cryptohash_free
*
* Free a hash context.
*/
void
pg_cryptohash_free(pg_cryptohash_ctx *ctx)
{
if (ctx == NULL)
return;
EVP_MD_CTX_destroy(ctx->evpctx);
#ifndef FRONTEND
ResourceOwnerForgetCryptoHash(ctx->resowner,
PointerGetDatum(ctx));
#endif
explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
FREE(ctx);
}
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