Thumb2 AES ASM: don't assume alignment on key

Fix AES_set_encrypt_key to not assume a word alignment on key.

Author: SparkiDev

wolfcrypt/src/port/arm/thumb2-aes-asm.S

@@ -714,15 +714,19 @@ AES_set_encrypt_key:
 #else
 	BEQ.W	L_AES_set_encrypt_key_start_192
 #endif
-	LDRD	r4, r5, [r0]
-	LDRD	r6, r7, [r0, #8]
+	LDR	r4, [r0]
+	LDR	r5, [r0, #4]
+	LDR	r6, [r0, #8]
+	LDR	r7, [r0, #12]
 	REV	r4, r4
 	REV	r5, r5
 	REV	r6, r6
 	REV	r7, r7
 	STM	r2!, {r4, r5, r6, r7}
-	LDRD	r4, r5, [r0, #16]
-	LDRD	r6, r7, [r0, #24]
+	LDR	r4, [r0, #16]
+	LDR	r5, [r0, #20]
+	LDR	r6, [r0, #24]
+	LDR	r7, [r0, #28]
 	REV	r4, r4
 	REV	r5, r5
 	REV	r6, r6
@@ -805,9 +809,12 @@ L_AES_set_encrypt_key_loop_256:
 	B.N	L_AES_set_encrypt_key_end
 #endif
 L_AES_set_encrypt_key_start_192:
-	LDRD	r4, r5, [r0]
-	LDRD	r6, r7, [r0, #8]
-	LDRD	r8, r9, [r0, #16]
+	LDR	r4, [r0]
+	LDR	r5, [r0, #4]
+	LDR	r6, [r0, #8]
+	LDR	r7, [r0, #12]
+	LDR	r8, [r0, #16]
+	LDR	r9, [r0, #20]
 	REV	r4, r4
 	REV	r5, r5
 	REV	r6, r6
@@ -871,8 +878,10 @@ L_AES_set_encrypt_key_loop_192:
 	B.N	L_AES_set_encrypt_key_end
 #endif
 L_AES_set_encrypt_key_start_128:
-	LDRD	r4, r5, [r0]
-	LDRD	r6, r7, [r0, #8]
+	LDR	r4, [r0]
+	LDR	r5, [r0, #4]
+	LDR	r6, [r0, #8]
+	LDR	r7, [r0, #12]
 	REV	r4, r4
 	REV	r5, r5
 	REV	r6, r6
@@ -907,7 +916,7 @@ L_AES_set_encrypt_key_loop_128:
 #endif
 L_AES_set_encrypt_key_end:
 	POP	{r4, r5, r6, r7, r8, r9, r10, pc}
-	/* Cycle Count = 331 */
+	/* Cycle Count = 340 */
 	.size	AES_set_encrypt_key,.-AES_set_encrypt_key
 	.text
 	.align	4

wolfcrypt/src/port/arm/thumb2-aes-asm_c.c

@@ -357,15 +357,19 @@ void AES_set_encrypt_key(const unsigned char* key, word32 len, unsigned char* ks
 #else
         "BEQ.W	L_AES_set_encrypt_key_start_192\n\t"
 #endif
-        "LDRD	r4, r5, [%[key]]\n\t"
-        "LDRD	r6, r7, [%[key], #8]\n\t"
+        "LDR	r4, [%[key]]\n\t"
+        "LDR	r5, [%[key], #4]\n\t"
+        "LDR	r6, [%[key], #8]\n\t"
+        "LDR	r7, [%[key], #12]\n\t"
         "REV	r4, r4\n\t"
         "REV	r5, r5\n\t"
         "REV	r6, r6\n\t"
         "REV	r7, r7\n\t"
         "STM	%[ks]!, {r4, r5, r6, r7}\n\t"
-        "LDRD	r4, r5, [%[key], #16]\n\t"
-        "LDRD	r6, r7, [%[key], #24]\n\t"
+        "LDR	r4, [%[key], #16]\n\t"
+        "LDR	r5, [%[key], #20]\n\t"
+        "LDR	r6, [%[key], #24]\n\t"
+        "LDR	r7, [%[key], #28]\n\t"
         "REV	r4, r4\n\t"
         "REV	r5, r5\n\t"
         "REV	r6, r6\n\t"
@@ -450,9 +454,12 @@ void AES_set_encrypt_key(const unsigned char* key, word32 len, unsigned char* ks
 #endif
         "\n"
     "L_AES_set_encrypt_key_start_192:\n\t"
-        "LDRD	r4, r5, [%[key]]\n\t"
-        "LDRD	r6, r7, [%[key], #8]\n\t"
-        "LDRD	r8, r9, [%[key], #16]\n\t"
+        "LDR	r4, [%[key]]\n\t"
+        "LDR	r5, [%[key], #4]\n\t"
+        "LDR	r6, [%[key], #8]\n\t"
+        "LDR	r7, [%[key], #12]\n\t"
+        "LDR	r8, [%[key], #16]\n\t"
+        "LDR	r9, [%[key], #20]\n\t"
         "REV	r4, r4\n\t"
         "REV	r5, r5\n\t"
         "REV	r6, r6\n\t"
@@ -518,8 +525,10 @@ void AES_set_encrypt_key(const unsigned char* key, word32 len, unsigned char* ks
 #endif
         "\n"
     "L_AES_set_encrypt_key_start_128:\n\t"
-        "LDRD	r4, r5, [%[key]]\n\t"
-        "LDRD	r6, r7, [%[key], #8]\n\t"
+        "LDR	r4, [%[key]]\n\t"
+        "LDR	r5, [%[key], #4]\n\t"
+        "LDR	r6, [%[key], #8]\n\t"
+        "LDR	r7, [%[key], #12]\n\t"
         "REV	r4, r4\n\t"
         "REV	r5, r5\n\t"
         "REV	r6, r6\n\t"