diff options
author | Micah Anderson <micah@riseup.net> | 2014-08-11 13:49:21 -0400 |
---|---|---|
committer | Micah Anderson <micah@riseup.net> | 2014-08-11 13:49:21 -0400 |
commit | 2e59f9740a29439df7c7a56cf0ae83dec3081d31 (patch) | |
tree | d5e7c4e74c9a0f1ea999327d2e68b1dd27be00e0 /src/libsodium/crypto_sign/ed25519/ref10/fe_isnonzero.c |
initial import of debian version from mentors0.6.1
Diffstat (limited to 'src/libsodium/crypto_sign/ed25519/ref10/fe_isnonzero.c')
-rw-r--r-- | src/libsodium/crypto_sign/ed25519/ref10/fe_isnonzero.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/libsodium/crypto_sign/ed25519/ref10/fe_isnonzero.c b/src/libsodium/crypto_sign/ed25519/ref10/fe_isnonzero.c new file mode 100644 index 0000000..db29c25 --- /dev/null +++ b/src/libsodium/crypto_sign/ed25519/ref10/fe_isnonzero.c @@ -0,0 +1,19 @@ +#include "fe.h" +#include "crypto_verify_32.h" + +/* +return 1 if f == 0 +return 0 if f != 0 + +Preconditions: + |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc. +*/ + +static unsigned char zero[32]; + +int fe_isnonzero(const fe f) +{ + unsigned char s[32]; + fe_tobytes(s,f); + return crypto_verify_32(s,zero); +} |