[Review OP-TEE#2] Check OID hash algorithm returned

Minor fix rsassa.c

Signed-off-by: Clement Faure <clement.faure@nxp.com>

Author: clementfaure

core/drivers/crypto/crypto_api/acipher/rsassa.c

@@ -22,6 +22,23 @@
 
 #include "local.h"
 
+static struct drvcrypt_oid *rsassa_get_hash_oid_alg(uint32_t algo)
+{
+	uint32_t main_alg = TEE_ALG_GET_MAIN_ALG(algo);
+
+	switch (main_alg) {
+	case TEE_MAIN_ALGO_MD5:
+	case TEE_MAIN_ALGO_SHA1:
+	case TEE_MAIN_ALGO_SHA224:
+	case TEE_MAIN_ALGO_SHA256:
+	case TEE_MAIN_ALGO_SHA384:
+	case TEE_MAIN_ALGO_SHA512:
+		return &drvcrypt_hash_oid[main_alg];
+	default:
+		return NULL;
+	}
+}
+
 /*
  * PKCS#1 V1.5 - Encode the message in Distinguished Encoding Rules
  * (DER) format.
@@ -37,8 +54,9 @@ static TEE_Result emsa_pkcs1_v1_5_encode(struct drvcrypt_rsa_ssa *ssa_data,
 	size_t ps_size = 0;
 	uint8_t *buf = NULL;
 
-	hash_oid =
-		&drvcrypt_hash_oid[TEE_ALG_GET_MAIN_ALG(ssa_data->hash_algo)];
+	hash_oid = rsassa_get_hash_oid_alg(ssa_data->hash_algo);
+	if (!hash_oid)
+		return TEE_ERROR_NOT_SUPPORTED;
 
 	/*
 	 * Calculate the PS size