[PATCH v4 03/16] keytoc: fix ECDSA endianess problems

[Sascha Hauer]

We print the ECDSA key values out as an uint32_t C array. They are used in
barebox as a uint64_t C array, so when the endianess of the build system
differs from the system barebox runs on we end up with the 32bit words
swapped in the u64 array. Fix this by printing out the key values as
an uint64_t array.

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 scripts/keytoc.c | 42 +++++++++++++++++++++---------------------
 1 file changed, 21 insertions(+), 21 deletions(-)

diff --git a/scripts/keytoc.c b/scripts/keytoc.c
index 7e73c786a3..b140160688 100644
--- a/scripts/keytoc.c
+++ b/scripts/keytoc.c
@@ -315,12 +315,12 @@ static int rsa_get_params(EVP_PKEY *key, uint64_t *exponent, uint32_t *n0_invp,
 
 static FILE *outfilep;
 
-static int print_bignum(BIGNUM *num, int num_bits)
+static int print_bignum(BIGNUM *num, int num_bits, int width)
 {
 	BIGNUM *tmp, *big2, *big32, *big2_32;
 	BN_CTX *ctx;
 	int i;
-	uint32_t *arr;
+	uint64_t *arr;
 
 	tmp = BN_new();
 	big2 = BN_new();
@@ -345,34 +345,34 @@ static int print_bignum(BIGNUM *num, int num_bits)
 		return -ENOMEM;
 	}
 	BN_set_word(big2, 2L);
-	BN_set_word(big32, 32L);
-	BN_exp(big2_32, big2, big32, ctx); /* B = 2^32 */
+	BN_set_word(big32, width);
+	BN_exp(big2_32, big2, big32, ctx); /* B = 2^width */
 
-	arr = malloc(num_bits / 32 * sizeof(uint32_t));
+	arr = malloc(num_bits / width * sizeof(*arr));
 
-	for (i = 0; i < num_bits / 32; i++) {
+	for (i = 0; i < num_bits / width; i++) {
 		BN_mod(tmp, num, big2_32, ctx); /* n = N mod B */
 		arr[i] = BN_get_word(tmp);
-		BN_rshift(num, num, 32); /*  N = N/B */
+		BN_rshift(num, num, width); /*  N = N/B */
 	}
 
 	if (dts) {
-		for (i = 0; i < num_bits / 32; i++) {
+		for (i = 0; i < num_bits / width; i++) {
 			if (i % 4)
 				fprintf(outfilep, " ");
 			else
 				fprintf(outfilep, "\n\t\t\t\t");
-			fprintf(outfilep, "0x%08x", arr[num_bits / 32 - 1 - i]);
-			BN_rshift(num, num, 32); /*  N = N/B */
+			fprintf(outfilep, "0x%0*jx", width / 4, arr[num_bits / width - 1 - i]);
+			BN_rshift(num, num, width); /*  N = N/B */
 		}
 	} else {
-		for (i = 0; i < num_bits / 32; i++) {
+		for (i = 0; i < num_bits / width; i++) {
 			if (i % 4)
 				fprintf(outfilep, " ");
 			else
 				fprintf(outfilep, "\n\t");
-			fprintf(outfilep, "0x%08x,", arr[i]);
-			BN_rshift(num, num, 32); /*  N = N/B */
+			fprintf(outfilep, "0x%0*jx,", width / 4, arr[i]);
+			BN_rshift(num, num, width); /*  N = N/B */
 		}
 	}
 
@@ -473,12 +473,12 @@ static int gen_key_ecdsa(EVP_PKEY *key, const char *key_name, const char *key_na
 		fprintf(stderr, "ERROR: generating a dts snippet for ECDSA keys is not yet supported\n");
 		return -EOPNOTSUPP;
 	} else {
-		fprintf(outfilep, "\nstatic uint32_t %s_x[] = {", key_name_c);
-		print_bignum(key_x, bits);
+		fprintf(outfilep, "\nstatic uint64_t %s_x[] = {", key_name_c);
+		print_bignum(key_x, bits, 64);
 		fprintf(outfilep, "\n};\n\n");
 
-		fprintf(outfilep, "static uint32_t %s_y[] = {", key_name_c);
-		print_bignum(key_y, bits);
+		fprintf(outfilep, "static uint64_t %s_y[] = {", key_name_c);
+		print_bignum(key_y, bits, 64);
 		fprintf(outfilep, "\n};\n\n");
 
 		fprintf(outfilep, "static struct ecdsa_public_key %s = {\n", key_name_c);
@@ -512,10 +512,10 @@ static int gen_key_rsa(EVP_PKEY *key, const char *key_name, const char *key_name
 	if (dts) {
 		fprintf(outfilep, "\t\tkey-%s {\n", key_name_c);
 		fprintf(outfilep, "\t\t\trsa,r-squared = <");
-		print_bignum(r_squared, bits);
+		print_bignum(r_squared, bits, 32);
 		fprintf(outfilep, ">;\n");
 		fprintf(outfilep, "\t\t\trsa,modulus= <");
-		print_bignum(modulus, bits);
+		print_bignum(modulus, bits, 32);
 		fprintf(outfilep, ">;\n");
 		fprintf(outfilep, "\t\t\trsa,exponent = <0x%0lx 0x%lx>;\n",
 			(exponent >> 32) & 0xffffffff,
@@ -526,11 +526,11 @@ static int gen_key_rsa(EVP_PKEY *key, const char *key_name, const char *key_name
 		fprintf(outfilep, "\t\t};\n");
 	} else {
 		fprintf(outfilep, "\nstatic uint32_t %s_modulus[] = {", key_name_c);
-		print_bignum(modulus, bits);
+		print_bignum(modulus, bits, 32);
 		fprintf(outfilep, "\n};\n\n");
 
 		fprintf(outfilep, "static uint32_t %s_rr[] = {", key_name_c);
-		print_bignum(r_squared, bits);
+		print_bignum(r_squared, bits, 32);
 		fprintf(outfilep, "\n};\n\n");
 
 		if (standalone) {
-- 
2.39.2