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Allow alternate implementation of GCM

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Provide the ability to use an alternative implementation of GCM in place
of the library-provided implementation.
This commit is contained in:
Jaeden Amero 2017-09-21 12:53:48 +01:00
parent 72ea31b026
commit 1526330931
5 changed files with 29 additions and 0 deletions
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6
ChangeLog
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@ -1,5 +1,11 @@
mbed TLS ChangeLog (Sorted per branch, date) mbed TLS ChangeLog (Sorted per branch, date)
= mbed TLS x.x.x branch released xxxx-xx-xx
Features
* Add support for alternative implementations of GCM, selected by the
configuration flag MBEDTLS_GCM_ALT in config.h
= mbed TLS 2.6.0 branch released 2017-08-10 = mbed TLS 2.6.0 branch released 2017-08-10
Security Security

1
include/mbedtls/config.h
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@ -267,6 +267,7 @@
//#define MBEDTLS_BLOWFISH_ALT //#define MBEDTLS_BLOWFISH_ALT
//#define MBEDTLS_CAMELLIA_ALT //#define MBEDTLS_CAMELLIA_ALT
//#define MBEDTLS_DES_ALT //#define MBEDTLS_DES_ALT
//#define MBEDTLS_GCM_ALT
//#define MBEDTLS_XTEA_ALT //#define MBEDTLS_XTEA_ALT
//#define MBEDTLS_MD2_ALT //#define MBEDTLS_MD2_ALT
//#define MBEDTLS_MD4_ALT //#define MBEDTLS_MD4_ALT

15
include/mbedtls/gcm.h
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@ -33,6 +33,8 @@
#define MBEDTLS_ERR_GCM_AUTH_FAILED -0x0012 /**< Authenticated decryption failed. */ #define MBEDTLS_ERR_GCM_AUTH_FAILED -0x0012 /**< Authenticated decryption failed. */
#define MBEDTLS_ERR_GCM_BAD_INPUT -0x0014 /**< Bad input parameters to function. */ #define MBEDTLS_ERR_GCM_BAD_INPUT -0x0014 /**< Bad input parameters to function. */
#if !defined(MBEDTLS_GCM_ALT)
#ifdef __cplusplus #ifdef __cplusplus
extern "C" { extern "C" {
#endif #endif
@ -206,6 +208,18 @@ int mbedtls_gcm_finish( mbedtls_gcm_context *ctx,
*/ */
void mbedtls_gcm_free( mbedtls_gcm_context *ctx ); void mbedtls_gcm_free( mbedtls_gcm_context *ctx );
#ifdef __cplusplus
}
#endif
#else /* !MBEDTLS_GCM_ALT */
#include "gcm_alt.h"
#endif /* !MBEDTLS_GCM_ALT */
#ifdef __cplusplus
extern "C" {
#endif
/** /**
* \brief Checkup routine * \brief Checkup routine
* *
@ -217,4 +231,5 @@ int mbedtls_gcm_self_test( int verbose );
} }
#endif #endif
#endif /* gcm.h */ #endif /* gcm.h */

4
library/gcm.c
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@ -54,6 +54,8 @@
#endif /* MBEDTLS_PLATFORM_C */ #endif /* MBEDTLS_PLATFORM_C */
#endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */ #endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */
#if !defined(MBEDTLS_GCM_ALT)
/* /*
* 32-bit integer manipulation macros (big endian) * 32-bit integer manipulation macros (big endian)
*/ */
@ -508,6 +510,8 @@ void mbedtls_gcm_free( mbedtls_gcm_context *ctx )
mbedtls_zeroize( ctx, sizeof( mbedtls_gcm_context ) ); mbedtls_zeroize( ctx, sizeof( mbedtls_gcm_context ) );
} }
#endif /* !MBEDTLS_GCM_ALT */
#if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C) #if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
/* /*
* AES-GCM test vectors from: * AES-GCM test vectors from:

3
library/version_features.c
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@ -99,6 +99,9 @@ static const char *features[] = {
#if defined(MBEDTLS_DES_ALT) #if defined(MBEDTLS_DES_ALT)
"MBEDTLS_DES_ALT", "MBEDTLS_DES_ALT",
#endif /* MBEDTLS_DES_ALT */ #endif /* MBEDTLS_DES_ALT */
#if defined(MBEDTLS_GCM_ALT)
"MBEDTLS_GCM_ALT",
#endif /* MBEDTLS_GCM_ALT */
#if defined(MBEDTLS_XTEA_ALT) #if defined(MBEDTLS_XTEA_ALT)
"MBEDTLS_XTEA_ALT", "MBEDTLS_XTEA_ALT",
#endif /* MBEDTLS_XTEA_ALT */ #endif /* MBEDTLS_XTEA_ALT */