commit 4684525ae98eec45b36f6a5324f49fe863ec5a6b
author Paul Elliott <paul.elliott@arm.com> Fri Feb 03 14:59:11 2023 +0000
committer Paul Elliott <paul.elliott@arm.com> Wed Feb 15 23:34:29 2023 +0000
tree 841e79330a89dc8809a9a0ddb56a2ddee987e5ef
parent a3a8abadff79922668ffcbc649a67c4643f96f4b

Remove unrequired mpis from sign operation struct

These are only used at the output stage.

Signed-off-by: Paul Elliott <paul.elliott@arm.com>

library/psa_crypto.c

diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index 748cb13..78d8702 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -3511,9 +3511,6 @@
 
     mbedtls_ecdsa_restart_init(&operation->restart_ctx);
 
-    mbedtls_mpi_init(&operation->r);
-    mbedtls_mpi_init(&operation->s);
-
     operation->curve_bytes = PSA_BITS_TO_BYTES(
         operation->ctx->grp.pbits);
 
@@ -3547,6 +3544,8 @@
     size_t *signature_length)
 {
     psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
+    mbedtls_mpi r;
+    mbedtls_mpi s;
 
 #if (defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA) || \
     defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA)) && \
@@ -3556,13 +3555,16 @@
         return PSA_ERROR_BUFFER_TOO_SMALL;
     }
 
+    mbedtls_mpi_init(&r);
+    mbedtls_mpi_init(&s);
 
     if (PSA_ALG_ECDSA_IS_DETERMINISTIC(operation->alg)) {
+
 #if defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA)
         status = mbedtls_to_psa_error(
             mbedtls_ecdsa_sign_det_restartable(&operation->ctx->grp,
-                                               &operation->r,
-                                               &operation->s,
+                                               &r,
+                                               &s,
                                                &operation->ctx->d,
                                                operation->hash,
                                                operation->hash_length,
@@ -3577,8 +3579,8 @@
 
         status = mbedtls_to_psa_error(
             mbedtls_ecdsa_sign_restartable(&operation->ctx->grp,
-                                           &operation->r,
-                                           &operation->s,
+                                           &r,
+                                           &s,
                                            &operation->ctx->d,
                                            operation->hash,
                                            operation->hash_length,
@@ -3593,7 +3595,7 @@
         return status;
     } else {
         status =  mbedtls_to_psa_error(
-            mbedtls_mpi_write_binary(&operation->r,
+            mbedtls_mpi_write_binary(&r,
                                      signature,
                                      operation->curve_bytes));
 
@@ -3602,7 +3604,7 @@
         }
 
         status =  mbedtls_to_psa_error(
-            mbedtls_mpi_write_binary(&operation->s,
+            mbedtls_mpi_write_binary(&s,
                                      signature +
                                      operation->curve_bytes,
                                      operation->curve_bytes));
@@ -3645,9 +3647,6 @@
 
     mbedtls_ecdsa_restart_free(&operation->restart_ctx);
 
-    mbedtls_mpi_free(&operation->r);
-    mbedtls_mpi_free(&operation->s);
-
     return PSA_SUCCESS;
 
 #else