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[crypto] Use linker tables for RSA digestInfo prefixes 

Allow external code to specify RSA digestInfo prefixes for additional
digest algorithms.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/6/head
Michael Brown 2012-03-20 04:20:06 +00:00
parent 7869f71ae7
commit 05c13716f9
2 changed files with 44 additions and 37 deletions
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63
src/crypto/rsa.c
View File

@ -39,45 +39,37 @@ FILE_LICENCE ( GPL2_OR_LATER );
* RSA is documented in RFC 3447.
*/
/** An RSA digestInfo prefix */
struct rsa_digestinfo_prefix {
/** Digest algorithm */
struct digest_algorithm *digest;
/** Prefix */
const void *data;
/** Length of prefix */
size_t len;
};
/** "id-md5" object identifier */
static const uint8_t rsa_md5_prefix[] =
/** MD5 digestInfo prefix */
static const uint8_t rsa_md5_prefix_data[] =
{ RSA_DIGESTINFO_PREFIX ( MD5_DIGEST_SIZE, ASN1_OID_MD5 ) };
/** "id-sha1" object identifier */
static const uint8_t rsa_sha1_prefix[] =
/** SHA-1 digestInfo prefix */
static const uint8_t rsa_sha1_prefix_data[] =
{ RSA_DIGESTINFO_PREFIX ( SHA1_DIGEST_SIZE, ASN1_OID_SHA1 ) };
/** "id-sha256" object identifier */
static const uint8_t rsa_sha256_prefix[] =
/** SHA-256 digestInfo prefix */
static const uint8_t rsa_sha256_prefix_data[] =
{ RSA_DIGESTINFO_PREFIX ( SHA256_DIGEST_SIZE, ASN1_OID_SHA256 ) };
/** RSA digestInfo prefixes */
static struct rsa_digestinfo_prefix rsa_digestinfo_prefixes[] = {
{
.digest = &md5_algorithm,
.data = rsa_md5_prefix,
.len = sizeof ( rsa_md5_prefix ),
},
{
.digest = &sha1_algorithm,
.data = rsa_sha1_prefix,
.len = sizeof ( rsa_sha1_prefix ),
},
{
.digest = &sha256_algorithm,
.data = rsa_sha256_prefix,
.len = sizeof ( rsa_sha256_prefix ),
},
/** MD5 digestInfo prefix */
struct rsa_digestinfo_prefix rsa_md5_prefix __rsa_digestinfo_prefix = {
.digest = &md5_algorithm,
.data = rsa_md5_prefix_data,
.len = sizeof ( rsa_md5_prefix_data ),
};
/** SHA-1 digestInfo prefix */
struct rsa_digestinfo_prefix rsa_sha1_prefix __rsa_digestinfo_prefix = {
.digest = &sha1_algorithm,
.data = rsa_sha1_prefix_data,
.len = sizeof ( rsa_sha1_prefix_data ),
};
/** SHA-256 digestInfo prefix */
struct rsa_digestinfo_prefix rsa_sha256_prefix __rsa_digestinfo_prefix = {
.digest = &sha256_algorithm,
.data = rsa_sha256_prefix_data,
.len = sizeof ( rsa_sha256_prefix_data ),
};
/**
@ -89,11 +81,8 @@ static struct rsa_digestinfo_prefix rsa_digestinfo_prefixes[] = {
static struct rsa_digestinfo_prefix *
rsa_find_prefix ( struct digest_algorithm *digest ) {
struct rsa_digestinfo_prefix *prefix;
unsigned int i;
for ( i = 0 ; i < ( sizeof ( rsa_digestinfo_prefixes ) /
sizeof ( rsa_digestinfo_prefixes[0] ) ) ; i++ ) {
prefix = &rsa_digestinfo_prefixes[i];
for_each_table_entry ( prefix, RSA_DIGESTINFO_PREFIXES ) {
if ( prefix->digest == digest )
return prefix;
}

18
src/include/ipxe/rsa.h
View File

@ -11,6 +11,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
#include <ipxe/crypto.h>
#include <ipxe/bigint.h>
#include <ipxe/asn1.h>
#include <ipxe/tables.h>
/** ASN.1 OID for iso(1) member-body(2) us(840) */
#define ASN1_OID_ISO_US ASN1_OID_ISO_MEMBERBODY, ASN1_OID_DOUBLE ( 840 )
@ -111,6 +112,23 @@ FILE_LICENCE ( GPL2_OR_LATER );
RSA_DIGESTALGORITHM ( __VA_ARGS__ ), \
RSA_DIGEST_PREFIX ( digest_size )
/** An RSA digestInfo prefix */
struct rsa_digestinfo_prefix {
/** Digest algorithm */
struct digest_algorithm *digest;
/** Prefix */
const void *data;
/** Length of prefix */
size_t len;
};
/** RSA digestInfo prefix table */
#define RSA_DIGESTINFO_PREFIXES \
__table ( struct rsa_digestinfo_prefix, "rsa_digestinfo_prefixes" )
/** Declare an RSA digestInfo prefix */
#define __rsa_digestinfo_prefix __table_entry ( RSA_DIGESTINFO_PREFIXES, 01 )
/** An RSA context */
struct rsa_context {
/** Allocated memory */