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Add and document an RSA-specific error code for unsupported exports

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E.g., a private key on an external chip might not be exportable to RAM.
This commit is contained in:
Hanno Becker 2017-09-29 12:50:12 +01:00
parent bead71752e
commit 91c194dabb
1 changed files with 34 additions and 0 deletions
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34
include/mbedtls/rsa.h
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@ -48,6 +48,7 @@
#define MBEDTLS_ERR_RSA_VERIFY_FAILED -0x4380 /**< The PKCS#1 verification failed. */ #define MBEDTLS_ERR_RSA_VERIFY_FAILED -0x4380 /**< The PKCS#1 verification failed. */
#define MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE -0x4400 /**< The output buffer for decryption is not large enough. */ #define MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE -0x4400 /**< The output buffer for decryption is not large enough. */
#define MBEDTLS_ERR_RSA_RNG_FAILED -0x4480 /**< The random generator failed to generate non-zeros. */ #define MBEDTLS_ERR_RSA_RNG_FAILED -0x4480 /**< The random generator failed to generate non-zeros. */
#define MBEDTLS_ERR_RSA_EXPORT_UNSUPPORTED -0x4500 /**< The requested parameter export is not possible/allowed. */
/* /*
* RSA constants * RSA constants
@ -446,6 +447,21 @@ int mbedtls_rsa_check_crt( const mbedtls_rsa_context *ctx,
* \param E MPI to hold the public exponent, or NULL * \param E MPI to hold the public exponent, or NULL
* *
* \return 0 if successful, non-zero error code otherwise. * \return 0 if successful, non-zero error code otherwise.
* In particular, if exporting the requested parameters
* cannot be done because of a lack of functionality
* or because of security policies, the error code
* MBEDTLS_ERR_RSA_EXPORT_UNSUPPORTED is returned.
* In this case, the RSA context stays intact and can
* be continued to be used.
*
* \note Two reasons for returning MBEDTLS_ERR_RSA_EXPORT_UNSUPPORTED
* would be the following: Firstly, it might be that an
* alternative RSA implementation is in use which stores
* the key externally, and which either cannot or should not
* export it into RAM. Alternatively, an implementation
* (regardless of SW or HW) might not support deducing e.g.
* P, Q from N, D, E if the former are not part of the
* implementation.
* *
*/ */
int mbedtls_rsa_export( const mbedtls_rsa_context *ctx, int mbedtls_rsa_export( const mbedtls_rsa_context *ctx,
@ -475,6 +491,24 @@ int mbedtls_rsa_export( const mbedtls_rsa_context *ctx,
* pointed to by N, P, Q, D, E are fully written, with * pointed to by N, P, Q, D, E are fully written, with
* additional unused space filled leading by 0-bytes. * additional unused space filled leading by 0-bytes.
* *
* \return 0 if successful, non-zero error code otherwise.
* In particular, if exporting the requested parameters
* cannot be done because of a lack of functionality
* or because of security policies, the error code
* MBEDTLS_ERR_RSA_EXPORT_UNSUPPORTED is returned.
* In this case, the RSA context stays intact and can
* be continued to be used.
*
* \note Two reasons for returning MBEDTLS_ERR_RSA_EXPORT_UNSUPPORTED
* would be the following: Firstly, it might be that an
* alternative RSA implementation is in use which stores
* the key externally, and which either cannot or should not
* export it into RAM. Alternatively, an implementation
* (regardless of SW or HW) might not support deducing e.g.
* P, Q from N, D, E if the former are not part of the
* implementation.
*
*
*/ */
int mbedtls_rsa_export_raw( const mbedtls_rsa_context *ctx, int mbedtls_rsa_export_raw( const mbedtls_rsa_context *ctx,
unsigned char *N, size_t N_len, unsigned char *N, size_t N_len,