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Document mutex usage for RSA

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The mutex is now initialized iff ver != 0.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2021-02-09 18:59:42 +01:00
parent 1226ecef01
commit 4337a9cb18
2 changed files with 10 additions and 1 deletions
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5
ChangeLog.d/rsa-mutex.txt
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@ -6,3 +6,8 @@ Bugfix
* Fix a resource leak in a bad-arguments case of mbedtls_rsa_gen_key() * Fix a resource leak in a bad-arguments case of mbedtls_rsa_gen_key()
when MBEDTLS_THREADING_C is enabled on platforms where initializing when MBEDTLS_THREADING_C is enabled on platforms where initializing
a mutex allocates resources. a mutex allocates resources.
Default behavior changes
* In mbedtls_rsa_context objects, the ver field was formerly documented
as always 0. It is now reserved for internal purposes and may take
different values.

6
include/mbedtls/rsa.h
View File

@ -97,7 +97,10 @@ extern "C" {
*/ */
typedef struct mbedtls_rsa_context typedef struct mbedtls_rsa_context
{ {
int ver; /*!< Always 0.*/ int ver; /*!< Reserved for internal purposes.
* Do not set this field in application
* code. Its meaning might change without
* notice. */
size_t len; /*!< The size of \p N in Bytes. */ size_t len; /*!< The size of \p N in Bytes. */
mbedtls_mpi N; /*!< The public modulus. */ mbedtls_mpi N; /*!< The public modulus. */
@ -127,6 +130,7 @@ typedef struct mbedtls_rsa_context
mask generating function used in the mask generating function used in the
EME-OAEP and EMSA-PSS encodings. */ EME-OAEP and EMSA-PSS encodings. */
#if defined(MBEDTLS_THREADING_C) #if defined(MBEDTLS_THREADING_C)
/* Invariant: the mutex is initialized iff ver != 0. */
mbedtls_threading_mutex_t mutex; /*!< Thread-safety mutex. */ mbedtls_threading_mutex_t mutex; /*!< Thread-safety mutex. */
#endif #endif
} }