1 files changed, 58 insertions, 26 deletions

diff --git a/src/crypto/zinc/poly1305/poly1305-x86_64-glue.h b/src/crypto/zinc/poly1305/poly1305-x86_64-glue.h
index d6495cd..f821f34 100644
--- a/src/crypto/zinc/poly1305/poly1305-x86_64-glue.h
+++ b/src/crypto/zinc/poly1305/poly1305-x86_64-glue.h
@@ -61,13 +61,43 @@ static inline bool poly1305_init_arch(void *ctx,
 }
 
 struct poly1305_arch_internal {
-	u32 h[5];
-	u32 is_base2_26;
+	union {
+		struct {
+			u32 h[5];
+			u32 is_base2_26;
+		};
+		u64 hs[3];
+	};
 	u64 r[2];
 	u64 pad;
 	struct { u32 r2, r1, r4, r3; } rn[9];
 };
 
+static void convert_to_base2_64(void *ctx)
+{
+	struct poly1305_arch_internal *state = ctx;
+	u32 cy;
+
+	if (!state->is_base2_26)
+		return;
+
+	cy = state->h[0] >> 26; state->h[0] &= 0x3ffffff; state->h[1] += cy;
+	cy = state->h[1] >> 26; state->h[1] &= 0x3ffffff; state->h[2] += cy;
+	cy = state->h[2] >> 26; state->h[2] &= 0x3ffffff; state->h[3] += cy;
+	cy = state->h[3] >> 26; state->h[3] &= 0x3ffffff; state->h[4] += cy;
+	state->hs[0] = ((u64)state->h[2] << 52) | ((u64)state->h[1] << 26) | state->h[0];
+	state->hs[1] = ((u64)state->h[4] << 40) | ((u64)state->h[3] << 14) | (state->h[2] >> 12);
+	state->hs[2] = state->h[4] >> 24;
+#define ULT(a, b) ((a ^ ((a ^ b) | ((a - b) ^ b))) >> (sizeof(a) * 8 - 1))
+	cy = (state->hs[2] >> 2) + (state->hs[2] & ~3ULL);
+	state->hs[2] &= 3;
+	state->hs[0] += cy;
+	state->hs[1] += (cy = ULT(state->hs[0], cy));
+	state->hs[2] += ULT(state->hs[1], cy);
+#undef ULT
+	state->is_base2_26 = 0;
+}
+
 static inline bool poly1305_blocks_arch(void *ctx, const u8 *inp,
 					const size_t len, const u32 padbit,
 					simd_context_t *simd_context)
@@ -77,24 +107,32 @@ static inline bool poly1305_blocks_arch(void *ctx, const u8 *inp,
 	if (!poly1305_use_avx ||
 	    (len < (POLY1305_BLOCK_SIZE * 18) && !state->is_base2_26) ||
 	    !simd_use(simd_context))
-	    poly1305_blocks_x86_64(ctx, inp, len, padbit);
-	else
+		goto scalar;
+
 #ifdef CONFIG_AS_AVX512
-	if (poly1305_use_avx512)
+	if (poly1305_use_avx512) {
 		poly1305_blocks_avx512(ctx, inp, len, padbit);
-	else
+		return true;
+	}
 #endif
+
 #ifdef CONFIG_AS_AVX2
-	if (poly1305_use_avx2)
+	if (poly1305_use_avx2) {
 		poly1305_blocks_avx2(ctx, inp, len, padbit);
-	else
+		return true;
+	}
 #endif
+
 #ifdef CONFIG_AS_AVX
-	if (poly1305_use_avx)
+	if (poly1305_use_avx) {
 		poly1305_blocks_avx(ctx, inp, len, padbit);
-	else
+		return true;
+	}
 #endif
-		poly1305_blocks_x86_64(ctx, inp, len, padbit);
+
+scalar:
+	convert_to_base2_64(ctx);
+	poly1305_blocks_x86_64(ctx, inp, len, padbit);
 	return true;
 }
 
@@ -105,23 +143,17 @@ static inline bool poly1305_emit_arch(void *ctx, u8 mac[POLY1305_MAC_SIZE],
 	struct poly1305_arch_internal *state = ctx;
 
 	if (!poly1305_use_avx || !state->is_base2_26 ||!simd_use(simd_context))
-		poly1305_emit_x86_64(ctx, mac, nonce);
-	else
-#ifdef CONFIG_AS_AVX512
-	if (poly1305_use_avx512)
-		poly1305_emit_avx(ctx, mac, nonce);
-	else
-#endif
-#ifdef CONFIG_AS_AVX2
-	if (poly1305_use_avx2)
-		poly1305_emit_avx(ctx, mac, nonce);
-	else
-#endif
+		goto scalar;
+
 #ifdef CONFIG_AS_AVX
-	if (poly1305_use_avx)
+	if (poly1305_use_avx || poly1305_use_avx2 || poly1305_use_avx512) {
 		poly1305_emit_avx(ctx, mac, nonce);
-	else
+		return true;
+	}
 #endif
-		poly1305_emit_x86_64(ctx, mac, nonce);
+
+scalar:
+	convert_to_base2_64(ctx);
+	poly1305_emit_x86_64(ctx, mac, nonce);
 	return true;
 }