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/*-------------------------------------------------------------------------
*
* cryptohash.c
* Fallback implementations for cryptographic hash functions.
*
* This is the set of in-core functions used when there are no other
* alternative options like OpenSSL.
*
* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/common/cryptohash.c
*
*-------------------------------------------------------------------------
*/
#ifndef FRONTEND
#include "postgres.h"
#else
#include "postgres_fe.h"
#endif
#include <sys/param.h>
#include "common/cryptohash.h"
#include "md5_int.h"
#include "sha1_int.h"
#include "sha2_int.h"
/*
* In backend, use palloc/pfree to ease the error handling. In frontend,
* use malloc to be able to return a failure status back to the caller.
*/
#ifndef FRONTEND
#define ALLOC(size) palloc(size)
#define FREE(ptr) pfree(ptr)
#else
#define ALLOC(size) malloc(size)
#define FREE(ptr) free(ptr)
#endif
/* Internal pg_cryptohash_ctx structure */
struct pg_cryptohash_ctx
{
pg_cryptohash_type type;
union
{
pg_md5_ctx md5;
pg_sha1_ctx sha1;
pg_sha224_ctx sha224;
pg_sha256_ctx sha256;
pg_sha384_ctx sha384;
pg_sha512_ctx sha512;
} data;
};
/*
* 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;
/*
* Note that this always allocates enough space for the largest hash. A
* smaller allocation would be enough for md5, sha224 and sha256, but the
* small extra amount of memory does not make it worth complicating this
* code.
*/
ctx = ALLOC(sizeof(pg_cryptohash_ctx));
if (ctx == NULL)
return NULL;
memset(ctx, 0, sizeof(pg_cryptohash_ctx));
ctx->type = type;
return ctx;
}
/*
* pg_cryptohash_init
*
* Initialize a hash context. Note that this implementation is designed
* to never fail, so this always returns 0.
*/
int
pg_cryptohash_init(pg_cryptohash_ctx *ctx)
{
if (ctx == NULL)
return -1;
switch (ctx->type)
{
case PG_MD5:
pg_md5_init(&ctx->data.md5);
break;
case PG_SHA1:
pg_sha1_init(&ctx->data.sha1);
break;
case PG_SHA224:
pg_sha224_init(&ctx->data.sha224);
break;
case PG_SHA256:
pg_sha256_init(&ctx->data.sha256);
break;
case PG_SHA384:
pg_sha384_init(&ctx->data.sha384);
break;
case PG_SHA512:
pg_sha512_init(&ctx->data.sha512);
break;
}
return 0;
}
/*
* pg_cryptohash_update
*
* Update a hash context. Note that this implementation is designed
* to never fail, so this always returns 0 except if the caller has
* given a NULL context.
*/
int
pg_cryptohash_update(pg_cryptohash_ctx *ctx, const uint8 *data, size_t len)
{
if (ctx == NULL)
return -1;
switch (ctx->type)
{
case PG_MD5:
pg_md5_update(&ctx->data.md5, data, len);
break;
case PG_SHA1:
pg_sha1_update(&ctx->data.sha1, data, len);
break;
case PG_SHA224:
pg_sha224_update(&ctx->data.sha224, data, len);
break;
case PG_SHA256:
pg_sha256_update(&ctx->data.sha256, data, len);
break;
case PG_SHA384:
pg_sha384_update(&ctx->data.sha384, data, len);
break;
case PG_SHA512:
pg_sha512_update(&ctx->data.sha512, data, len);
break;
}
return 0;
}
/*
* pg_cryptohash_final
*
* Finalize a hash context. Note that this implementation is designed to
* never fail, so this always returns 0 except if the destination buffer
* is not large enough.
*/
int
pg_cryptohash_final(pg_cryptohash_ctx *ctx, uint8 *dest, size_t len)
{
if (ctx == NULL)
return -1;
switch (ctx->type)
{
case PG_MD5:
if (len < MD5_DIGEST_LENGTH)
return -1;
pg_md5_final(&ctx->data.md5, dest);
break;
case PG_SHA1:
if (len < SHA1_DIGEST_LENGTH)
return -1;
pg_sha1_final(&ctx->data.sha1, dest);
break;
case PG_SHA224:
if (len < PG_SHA224_DIGEST_LENGTH)
return -1;
pg_sha224_final(&ctx->data.sha224, dest);
break;
case PG_SHA256:
if (len < PG_SHA256_DIGEST_LENGTH)
return -1;
pg_sha256_final(&ctx->data.sha256, dest);
break;
case PG_SHA384:
if (len < PG_SHA384_DIGEST_LENGTH)
return -1;
pg_sha384_final(&ctx->data.sha384, dest);
break;
case PG_SHA512:
if (len < PG_SHA512_DIGEST_LENGTH)
return -1;
pg_sha512_final(&ctx->data.sha512, dest);
break;
}
return 0;
}
/*
* pg_cryptohash_free
*
* Free a hash context.
*/
void
pg_cryptohash_free(pg_cryptohash_ctx *ctx)
{
if (ctx == NULL)
return;
explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
FREE(ctx);
}
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