From a5f28c133dcfbf3309eff0a3a73bb9429eee6c08 Mon Sep 17 00:00:00 2001 From: Thomas Altenbach Date: Mon, 9 Sep 2024 15:59:20 +0200 Subject: [PATCH] bootutil: Add SHA-512 support to Ed25519 When Ed25519 signatures are used, the bootutil_verify_sig responsible for verifying a signature was expecting as argument the SHA-256 digest of the firmware image. This commit slightly modifies this routine to make possible to use Ed25519 with SHA-512 digests. Signed-off-by: Thomas Altenbach --- boot/bootutil/src/image_ed25519.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/boot/bootutil/src/image_ed25519.c b/boot/bootutil/src/image_ed25519.c index 7a597d4c0..0d5e66df0 100644 --- a/boot/bootutil/src/image_ed25519.c +++ b/boot/bootutil/src/image_ed25519.c @@ -17,6 +17,7 @@ #include "bootutil_priv.h" #include "bootutil/crypto/common.h" +#include "bootutil/crypto/sha.h" static const uint8_t ed25519_pubkey_oid[] = MBEDTLS_OID_ISO_IDENTIFIED_ORG "\x65\x70"; #define NUM_ED25519_BYTES 32 @@ -73,7 +74,7 @@ bootutil_verify_sig(uint8_t *hash, uint32_t hlen, uint8_t *sig, size_t slen, uint8_t *pubkey; uint8_t *end; - if (hlen != 32 || slen != 64) { + if (hlen != IMAGE_HASH_SIZE || slen != 64) { FIH_SET(fih_rc, FIH_FAILURE); goto out; } @@ -87,7 +88,7 @@ bootutil_verify_sig(uint8_t *hash, uint32_t hlen, uint8_t *sig, size_t slen, goto out; } - rc = ED25519_verify(hash, 32, sig, pubkey); + rc = ED25519_verify(hash, IMAGE_HASH_SIZE, sig, pubkey); if (rc == 0) { /* if verify returns 0, there was an error. */