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/*-------------------------------------------------------------------------
*
* checksum_helper.c
* Compute a checksum of any of various types using common routines
*
* Portions Copyright (c) 2016-2021, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/common/checksum_helper.c
*
*-------------------------------------------------------------------------
*/
#ifndef FRONTEND
#include "postgres.h"
#else
#include "postgres_fe.h"
#endif
#include "common/checksum_helper.h"
/*
* If 'name' is a recognized checksum type, set *type to the corresponding
* constant and return true. Otherwise, set *type to CHECKSUM_TYPE_NONE and
* return false.
*/
bool
pg_checksum_parse_type(char *name, pg_checksum_type *type)
{
pg_checksum_type result_type = CHECKSUM_TYPE_NONE;
bool result = true;
if (pg_strcasecmp(name, "none") == 0)
result_type = CHECKSUM_TYPE_NONE;
else if (pg_strcasecmp(name, "crc32c") == 0)
result_type = CHECKSUM_TYPE_CRC32C;
else if (pg_strcasecmp(name, "sha224") == 0)
result_type = CHECKSUM_TYPE_SHA224;
else if (pg_strcasecmp(name, "sha256") == 0)
result_type = CHECKSUM_TYPE_SHA256;
else if (pg_strcasecmp(name, "sha384") == 0)
result_type = CHECKSUM_TYPE_SHA384;
else if (pg_strcasecmp(name, "sha512") == 0)
result_type = CHECKSUM_TYPE_SHA512;
else
result = false;
*type = result_type;
return result;
}
/*
* Get the canonical human-readable name corresponding to a checksum type.
*/
char *
pg_checksum_type_name(pg_checksum_type type)
{
switch (type)
{
case CHECKSUM_TYPE_NONE:
return "NONE";
case CHECKSUM_TYPE_CRC32C:
return "CRC32C";
case CHECKSUM_TYPE_SHA224:
return "SHA224";
case CHECKSUM_TYPE_SHA256:
return "SHA256";
case CHECKSUM_TYPE_SHA384:
return "SHA384";
case CHECKSUM_TYPE_SHA512:
return "SHA512";
}
Assert(false);
return "???";
}
/*
* Initialize a checksum context for checksums of the given type.
* Returns 0 for a success, -1 for a failure.
*/
int
pg_checksum_init(pg_checksum_context *context, pg_checksum_type type)
{
context->type = type;
switch (type)
{
case CHECKSUM_TYPE_NONE:
/* do nothing */
break;
case CHECKSUM_TYPE_CRC32C:
INIT_CRC32C(context->raw_context.c_crc32c);
break;
case CHECKSUM_TYPE_SHA224:
context->raw_context.c_sha2 = pg_cryptohash_create(PG_SHA224);
if (context->raw_context.c_sha2 == NULL)
return -1;
if (pg_cryptohash_init(context->raw_context.c_sha2) < 0)
{
pg_cryptohash_free(context->raw_context.c_sha2);
return -1;
}
break;
case CHECKSUM_TYPE_SHA256:
context->raw_context.c_sha2 = pg_cryptohash_create(PG_SHA256);
if (context->raw_context.c_sha2 == NULL)
return -1;
if (pg_cryptohash_init(context->raw_context.c_sha2) < 0)
{
pg_cryptohash_free(context->raw_context.c_sha2);
return -1;
}
break;
case CHECKSUM_TYPE_SHA384:
context->raw_context.c_sha2 = pg_cryptohash_create(PG_SHA384);
if (context->raw_context.c_sha2 == NULL)
return -1;
if (pg_cryptohash_init(context->raw_context.c_sha2) < 0)
{
pg_cryptohash_free(context->raw_context.c_sha2);
return -1;
}
break;
case CHECKSUM_TYPE_SHA512:
context->raw_context.c_sha2 = pg_cryptohash_create(PG_SHA512);
if (context->raw_context.c_sha2 == NULL)
return -1;
if (pg_cryptohash_init(context->raw_context.c_sha2) < 0)
{
pg_cryptohash_free(context->raw_context.c_sha2);
return -1;
}
break;
}
return 0;
}
/*
* Update a checksum context with new data.
* Returns 0 for a success, -1 for a failure.
*/
int
pg_checksum_update(pg_checksum_context *context, const uint8 *input,
size_t len)
{
switch (context->type)
{
case CHECKSUM_TYPE_NONE:
/* do nothing */
break;
case CHECKSUM_TYPE_CRC32C:
COMP_CRC32C(context->raw_context.c_crc32c, input, len);
break;
case CHECKSUM_TYPE_SHA224:
case CHECKSUM_TYPE_SHA256:
case CHECKSUM_TYPE_SHA384:
case CHECKSUM_TYPE_SHA512:
if (pg_cryptohash_update(context->raw_context.c_sha2, input, len) < 0)
return -1;
break;
}
return 0;
}
/*
* Finalize a checksum computation and write the result to an output buffer.
*
* The caller must ensure that the buffer is at least PG_CHECKSUM_MAX_LENGTH
* bytes in length. The return value is the number of bytes actually written,
* or -1 for a failure.
*/
int
pg_checksum_final(pg_checksum_context *context, uint8 *output)
{
int retval = 0;
StaticAssertStmt(sizeof(pg_crc32c) <= PG_CHECKSUM_MAX_LENGTH,
"CRC-32C digest too big for PG_CHECKSUM_MAX_LENGTH");
StaticAssertStmt(PG_SHA224_DIGEST_LENGTH <= PG_CHECKSUM_MAX_LENGTH,
"SHA224 digest too big for PG_CHECKSUM_MAX_LENGTH");
StaticAssertStmt(PG_SHA256_DIGEST_LENGTH <= PG_CHECKSUM_MAX_LENGTH,
"SHA256 digest too big for PG_CHECKSUM_MAX_LENGTH");
StaticAssertStmt(PG_SHA384_DIGEST_LENGTH <= PG_CHECKSUM_MAX_LENGTH,
"SHA384 digest too big for PG_CHECKSUM_MAX_LENGTH");
StaticAssertStmt(PG_SHA512_DIGEST_LENGTH <= PG_CHECKSUM_MAX_LENGTH,
"SHA512 digest too big for PG_CHECKSUM_MAX_LENGTH");
switch (context->type)
{
case CHECKSUM_TYPE_NONE:
break;
case CHECKSUM_TYPE_CRC32C:
FIN_CRC32C(context->raw_context.c_crc32c);
retval = sizeof(pg_crc32c);
memcpy(output, &context->raw_context.c_crc32c, retval);
break;
case CHECKSUM_TYPE_SHA224:
retval = PG_SHA224_DIGEST_LENGTH;
if (pg_cryptohash_final(context->raw_context.c_sha2,
output, retval) < 0)
return -1;
pg_cryptohash_free(context->raw_context.c_sha2);
break;
case CHECKSUM_TYPE_SHA256:
retval = PG_SHA256_DIGEST_LENGTH;
if (pg_cryptohash_final(context->raw_context.c_sha2,
output, retval) < 0)
return -1;
pg_cryptohash_free(context->raw_context.c_sha2);
break;
case CHECKSUM_TYPE_SHA384:
retval = PG_SHA384_DIGEST_LENGTH;
if (pg_cryptohash_final(context->raw_context.c_sha2,
output, retval) < 0)
return -1;
pg_cryptohash_free(context->raw_context.c_sha2);
break;
case CHECKSUM_TYPE_SHA512:
retval = PG_SHA512_DIGEST_LENGTH;
if (pg_cryptohash_final(context->raw_context.c_sha2,
output, retval) < 0)
return -1;
pg_cryptohash_free(context->raw_context.c_sha2);
break;
}
Assert(retval <= PG_CHECKSUM_MAX_LENGTH);
return retval;
}
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