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/*-------------------------------------------------------------------------
*
* hmac_openssl.c
* Implementation of HMAC with OpenSSL.
*
* 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/hmac_openssl.c
*
*-------------------------------------------------------------------------
*/
#ifndef FRONTEND
#include "postgres.h"
#else
#include "postgres_fe.h"
#endif
#include <openssl/hmac.h>
#include "common/hmac.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 backend, use an allocation in TopMemoryContext to count for resowner
* cleanup handling if necessary. For versions of OpenSSL where HMAC_CTX is
* known, just use palloc(). In frontend, use malloc to be able to return
* a failure status back to the caller.
*/
#ifndef FRONTEND
#ifdef HAVE_HMAC_CTX_NEW
#define ALLOC(size) MemoryContextAlloc(TopMemoryContext, size)
#else
#define ALLOC(size) palloc(size)
#endif
#define FREE(ptr) pfree(ptr)
#else /* FRONTEND */
#define ALLOC(size) malloc(size)
#define FREE(ptr) free(ptr)
#endif /* FRONTEND */
/* Internal pg_hmac_ctx structure */
struct pg_hmac_ctx
{
HMAC_CTX *hmacctx;
pg_cryptohash_type type;
#ifndef FRONTEND
ResourceOwner resowner;
#endif
};
/*
* pg_hmac_create
*
* Allocate a hash context. Returns NULL on failure for an OOM. The
* backend issues an error, without returning.
*/
pg_hmac_ctx *
pg_hmac_create(pg_cryptohash_type type)
{
pg_hmac_ctx *ctx;
ctx = ALLOC(sizeof(pg_hmac_ctx));
if (ctx == NULL)
return NULL;
memset(ctx, 0, sizeof(pg_hmac_ctx));
ctx->type = type;
/*
* Initialization takes care of assigning the correct type for OpenSSL.
*/
#ifdef HAVE_HMAC_CTX_NEW
#ifndef FRONTEND
ResourceOwnerEnlargeHMAC(CurrentResourceOwner);
#endif
ctx->hmacctx = HMAC_CTX_new();
#else
ctx->hmacctx = ALLOC(sizeof(HMAC_CTX));
#endif
if (ctx->hmacctx == NULL)
{
explicit_bzero(ctx, sizeof(pg_hmac_ctx));
FREE(ctx);
#ifndef FRONTEND
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
#endif
return NULL;
}
#ifdef HAVE_HMAC_CTX_NEW
#ifndef FRONTEND
ctx->resowner = CurrentResourceOwner;
ResourceOwnerRememberHMAC(CurrentResourceOwner, PointerGetDatum(ctx));
#endif
#else
memset(ctx->hmacctx, 0, sizeof(HMAC_CTX));
#endif /* HAVE_HMAC_CTX_NEW */
return ctx;
}
/*
* pg_hmac_init
*
* Initialize a HMAC context. Returns 0 on success, -1 on failure.
*/
int
pg_hmac_init(pg_hmac_ctx *ctx, const uint8 *key, size_t len)
{
int status = 0;
if (ctx == NULL)
return -1;
switch (ctx->type)
{
case PG_MD5:
status = HMAC_Init_ex(ctx->hmacctx, key, len, EVP_md5(), NULL);
break;
case PG_SHA1:
status = HMAC_Init_ex(ctx->hmacctx, key, len, EVP_sha1(), NULL);
break;
case PG_SHA224:
status = HMAC_Init_ex(ctx->hmacctx, key, len, EVP_sha224(), NULL);
break;
case PG_SHA256:
status = HMAC_Init_ex(ctx->hmacctx, key, len, EVP_sha256(), NULL);
break;
case PG_SHA384:
status = HMAC_Init_ex(ctx->hmacctx, key, len, EVP_sha384(), NULL);
break;
case PG_SHA512:
status = HMAC_Init_ex(ctx->hmacctx, key, len, EVP_sha512(), NULL);
break;
}
/* OpenSSL internals return 1 on success, 0 on failure */
if (status <= 0)
return -1;
return 0;
}
/*
* pg_hmac_update
*
* Update a HMAC context. Returns 0 on success, -1 on failure.
*/
int
pg_hmac_update(pg_hmac_ctx *ctx, const uint8 *data, size_t len)
{
int status = 0;
if (ctx == NULL)
return -1;
status = HMAC_Update(ctx->hmacctx, data, len);
/* OpenSSL internals return 1 on success, 0 on failure */
if (status <= 0)
return -1;
return 0;
}
/*
* pg_hmac_final
*
* Finalize a HMAC context. Returns 0 on success, -1 on failure.
*/
int
pg_hmac_final(pg_hmac_ctx *ctx, uint8 *dest, size_t len)
{
int status = 0;
uint32 outlen;
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 = HMAC_Final(ctx->hmacctx, dest, &outlen);
/* OpenSSL internals return 1 on success, 0 on failure */
if (status <= 0)
return -1;
return 0;
}
/*
* pg_hmac_free
*
* Free a HMAC context.
*/
void
pg_hmac_free(pg_hmac_ctx *ctx)
{
if (ctx == NULL)
return;
#ifdef HAVE_HMAC_CTX_FREE
HMAC_CTX_free(ctx->hmacctx);
#ifndef FRONTEND
ResourceOwnerForgetHMAC(ctx->resowner, PointerGetDatum(ctx));
#endif
#else
explicit_bzero(ctx->hmacctx, sizeof(HMAC_CTX));
FREE(ctx->hmacctx);
#endif
explicit_bzero(ctx, sizeof(pg_hmac_ctx));
FREE(ctx);
}
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