From: Janusz Dziemidowicz <[email protected]>
There seems to be a slight change in S-expressions (fortunately
backward compatible). There is also additional flag needed in rather
strange place (data section instead of key section), most probably a
bug in gcrypt.
Decrypting a 350MB file with gcrypt 1.5 takes around 4 seconds on Core
Quad Q9450 2.66GHz while with gcrypt 1.6 around 2.8s (the processor
does not support AES-NI).
---
src/libaacs/crypto.c | 20 ++++++++++++++++----
1 file changed, 16 insertions(+), 4 deletions(-)
diff --git a/src/libaacs/crypto.c b/src/libaacs/crypto.c
index f1b54f8..0738f31 100644
--- a/src/libaacs/crypto.c
+++ b/src/libaacs/crypto.c
@@ -127,6 +127,9 @@ int crypto_init()
if (!gcry_check_version(GCRYPT_VERSION)) {
crypto_init_check = 0;
}
+ if(GCRYPT_DEBUG) {
+ gcry_control(GCRYCTL_SET_DEBUG_FLAGS, 3);
+ }
}
return crypto_init_check;
@@ -297,14 +300,14 @@ static gcry_error_t _aacs_sexp_key(gcry_sexp_t
*p_sexp_key,
char *strfmt = str_printf(
"(%s"
"(ecdsa"
- "(p #"AACS_EC_p"#)"
- "(a #"AACS_EC_a"#)"
- "(b #"AACS_EC_b"#)"
+ "(p #00"AACS_EC_p"#)"
+ "(a #00"AACS_EC_a"#)"
+ "(b #00"AACS_EC_b"#)"
"(g #04"
AACS_EC_G_x
AACS_EC_G_y
"#)"
- "(n #"AACS_EC_n"#)"
+ "(n #00"AACS_EC_n"#)"
"(q #%s#)"
"%s))",
mpi_d ? "private-key" : "public-key",
@@ -352,7 +355,16 @@ static gcry_error_t _aacs_sexp_sha1(gcry_sexp_t
*p_sexp_data,
GCRY_VERIFY("gcry_sexp_build",
gcry_sexp_build(p_sexp_data, NULL,
"(data"
+#if defined(GCRYPT_VERSION_NUMBER) && GCRYPT_VERSION_NUMBER >= 0x010600
+ /*
+ * For some reason gcrypt 1.6.0
+ * requires 'param' flag here and not
+ * in key, probably a bug.
+ */
+ " (flags raw param)"
+#else
" (flags raw)"
+#endif
" (value %m))",
mpi_md
));
--
1.8.4
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