diff options
| author | Bernd Edlinger <bernd.edlinger@hotmail.de> | 2018-04-24 21:10:13 +0200 |
|---|---|---|
| committer | Bernd Edlinger <bernd.edlinger@hotmail.de> | 2020-05-27 20:11:20 +0200 |
| commit | 77286fe3ec6b9777934e67e35f3b7007143b0734 (patch) | |
| tree | 47f39fa07cd9979b57ad14f58bc39123133da115 /crypto/modes/xts128.c | |
| parent | c74aaa3920f116fe4c1003153838144c37d6e527 (diff) | |
Avoid undefined behavior with unaligned accesses
Fixes: #4983
[extended tests]
Reviewed-by: Nicola Tuveri <nic.tuv@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/6074)
Diffstat (limited to 'crypto/modes/xts128.c')
| -rw-r--r-- | crypto/modes/xts128.c | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/crypto/modes/xts128.c b/crypto/modes/xts128.c index 9d9b65caa5..9dbcb5bc9a 100644 --- a/crypto/modes/xts128.c +++ b/crypto/modes/xts128.c @@ -11,6 +11,14 @@ #include <openssl/crypto.h> #include "crypto/modes.h" +#ifndef STRICT_ALIGNMENT +# ifdef __GNUC__ +typedef u64 u64_a1 __attribute((__aligned__(1))); +# else +typedef u64 u64_a1; +# endif +#endif + int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, const unsigned char iv[16], const unsigned char *inp, unsigned char *out, @@ -45,8 +53,8 @@ int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, scratch.u[0] ^= tweak.u[0]; scratch.u[1] ^= tweak.u[1]; #else - scratch.u[0] = ((u64 *)inp)[0] ^ tweak.u[0]; - scratch.u[1] = ((u64 *)inp)[1] ^ tweak.u[1]; + scratch.u[0] = ((u64_a1 *)inp)[0] ^ tweak.u[0]; + scratch.u[1] = ((u64_a1 *)inp)[1] ^ tweak.u[1]; #endif (*ctx->block1) (scratch.c, scratch.c, ctx->key1); #if defined(STRICT_ALIGNMENT) @@ -54,8 +62,8 @@ int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, scratch.u[1] ^= tweak.u[1]; memcpy(out, scratch.c, 16); #else - ((u64 *)out)[0] = scratch.u[0] ^= tweak.u[0]; - ((u64 *)out)[1] = scratch.u[1] ^= tweak.u[1]; + ((u64_a1 *)out)[0] = scratch.u[0] ^= tweak.u[0]; + ((u64_a1 *)out)[1] = scratch.u[1] ^= tweak.u[1]; #endif inp += 16; out += 16; @@ -128,8 +136,8 @@ int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, scratch.u[0] ^= tweak1.u[0]; scratch.u[1] ^= tweak1.u[1]; #else - scratch.u[0] = ((u64 *)inp)[0] ^ tweak1.u[0]; - scratch.u[1] = ((u64 *)inp)[1] ^ tweak1.u[1]; + scratch.u[0] = ((u64_a1 *)inp)[0] ^ tweak1.u[0]; + scratch.u[1] = ((u64_a1 *)inp)[1] ^ tweak1.u[1]; #endif (*ctx->block1) (scratch.c, scratch.c, ctx->key1); scratch.u[0] ^= tweak1.u[0]; @@ -148,8 +156,8 @@ int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, scratch.u[1] ^= tweak.u[1]; memcpy(out, scratch.c, 16); #else - ((u64 *)out)[0] = scratch.u[0] ^ tweak.u[0]; - ((u64 *)out)[1] = scratch.u[1] ^ tweak.u[1]; + ((u64_a1 *)out)[0] = scratch.u[0] ^ tweak.u[0]; + ((u64_a1 *)out)[1] = scratch.u[1] ^ tweak.u[1]; #endif } |