Added detection for MIPS64 with n32 ABI.

[BearSSL] / src / aead / gcm.c

diff --git a/src/aead/gcm.c b/src/aead/gcm.c
index 9cf0f38..ede5f08 100644 (file)
--- a/src/aead/gcm.c
+++ b/src/aead/gcm.c
@@ -56,6 +56,7 @@ br_gcm_init(br_gcm_context *ctx, const br_block_ctr_class **bctx, br_ghash gh)
 {
        unsigned char iv[12];
 
+       ctx->vtable = &br_gcm_vtable;
        ctx->bctx = bctx;
        ctx->gh = gh;
 
@@ -262,9 +263,19 @@ br_gcm_get_tag(br_gcm_context *ctx, void *tag)
        (*ctx->bctx)->run(ctx->bctx, ctx->j0_1, ctx->j0_2, tag, 16);
 }
 
+/* see bearssl_aead.h */
+void
+br_gcm_get_tag_trunc(br_gcm_context *ctx, void *tag, size_t len)
+{
+       unsigned char tmp[16];
+
+       br_gcm_get_tag(ctx, tmp);
+       memcpy(tag, tmp, len);
+}
+
 /* see bearssl_aead.h */
 uint32_t
-br_gcm_check_tag(br_gcm_context *ctx, const void *tag)
+br_gcm_check_tag_trunc(br_gcm_context *ctx, const void *tag, size_t len)
 {
        unsigned char tmp[16];
        size_t u;
@@ -272,12 +283,19 @@ br_gcm_check_tag(br_gcm_context *ctx, const void *tag)
 
        br_gcm_get_tag(ctx, tmp);
        x = 0;
-       for (u = 0; u < sizeof tmp; u ++) {
+       for (u = 0; u < len; u ++) {
                x |= tmp[u] ^ ((const unsigned char *)tag)[u];
        }
        return EQ0(x);
 }
 
+/* see bearssl_aead.h */
+uint32_t
+br_gcm_check_tag(br_gcm_context *ctx, const void *tag)
+{
+       return br_gcm_check_tag_trunc(ctx, tag, 16);
+}
+
 /* see bearssl_aead.h */
 const br_aead_class br_gcm_vtable = {
        16,
@@ -292,5 +310,9 @@ const br_aead_class br_gcm_vtable = {
        (void (*)(const br_aead_class **, void *))
                &br_gcm_get_tag,
        (uint32_t (*)(const br_aead_class **, const void *))
-               &br_gcm_check_tag
+               &br_gcm_check_tag,
+       (void (*)(const br_aead_class **, void *, size_t))
+               &br_gcm_get_tag_trunc,
+       (uint32_t (*)(const br_aead_class **, const void *, size_t))
+               &br_gcm_check_tag_trunc
 };