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Add support for alternative RSA implementations

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Alternative RSA implementations can be provided by defining MBEDTLS_RSA_ALT in
config.h, defining an mbedtls_rsa_context struct in a new file rsa_alt.h and
re-implementing the RSA interface specified in rsa.h.

Through the previous reworkings, the adherence to the interface is the only
implementation obligation - in particular, implementors are free to use a
different layout for the RSA context structure.
This commit is contained in:
Hanno Becker 2017-08-23 16:24:51 +01:00
parent bf37b10370
commit ab3773123c
4 changed files with 15 additions and 0 deletions
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1
include/mbedtls/config.h
View File

@ -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_RSA_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

8
include/mbedtls/rsa.h
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@ -209,6 +209,8 @@ int mbedtls_rsa_check_params( mbedtls_mpi *N, mbedtls_mpi *P, mbedtls_mpi *Q,
* Implementation of RSA interface * Implementation of RSA interface
*/ */
#if !defined(MBEDTLS_RSA_ALT)
/** /**
* \brief RSA context structure * \brief RSA context structure
*/ */
@ -252,6 +254,12 @@ typedef struct
} }
mbedtls_rsa_context; mbedtls_rsa_context;
#else
#include "rsa_alt.h"
#endif /* MBEDTLS_RSA_ALT */
/** /**
* \brief Initialize an RSA context * \brief Initialize an RSA context
* *

3
library/rsa.c
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@ -464,6 +464,7 @@ cleanup:
* Default RSA interface implementation * Default RSA interface implementation
*/ */
#if !defined(MBEDTLS_RSA_ALT)
int mbedtls_rsa_import( mbedtls_rsa_context *ctx, int mbedtls_rsa_import( mbedtls_rsa_context *ctx,
const mbedtls_mpi *N, const mbedtls_mpi *N,
@ -2493,6 +2494,8 @@ void mbedtls_rsa_free( mbedtls_rsa_context *ctx )
#endif #endif
} }
#endif /* !MBEDTLS_RSA_ALT */
#if defined(MBEDTLS_SELF_TEST) #if defined(MBEDTLS_SELF_TEST)
#include "mbedtls/sha1.h" #include "mbedtls/sha1.h"

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_RSA_ALT)
"MBEDTLS_RSA_ALT",
#endif /* MBEDTLS_RSA_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 */