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author | rsc <devnull@localhost> | 2004-03-21 14:04:56 +0000 |
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committer | rsc <devnull@localhost> | 2004-03-21 14:04:56 +0000 |
commit | 0fc65b37a1e7585ca2347bf61dcb8bc3a6b146a4 (patch) | |
tree | dd9189a823998f494082adb769451f12be056566 /src/libsec/port/egverify.c | |
parent | 768206abfcf505fb034a0151bf263bc0b1f2380c (diff) | |
download | plan9port-0fc65b37a1e7585ca2347bf61dcb8bc3a6b146a4.tar.gz plan9port-0fc65b37a1e7585ca2347bf61dcb8bc3a6b146a4.tar.bz2 plan9port-0fc65b37a1e7585ca2347bf61dcb8bc3a6b146a4.zip |
Add most of libsec.
Diffstat (limited to 'src/libsec/port/egverify.c')
-rw-r--r-- | src/libsec/port/egverify.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/src/libsec/port/egverify.c b/src/libsec/port/egverify.c new file mode 100644 index 00000000..29a95156 --- /dev/null +++ b/src/libsec/port/egverify.c @@ -0,0 +1,29 @@ +#include "os.h" +#include <mp.h> +#include <libsec.h> + +int +egverify(EGpub *pub, EGsig *sig, mpint *m) +{ + mpint *p = pub->p, *alpha = pub->alpha; + mpint *r = sig->r, *s = sig->s; + mpint *v1, *v2, *rs; + int rv = -1; + + if(mpcmp(r, mpone) < 0 || mpcmp(r, p) >= 0) + return rv; + v1 = mpnew(0); + rs = mpnew(0); + v2 = mpnew(0); + mpexp(pub->key, r, p, v1); + mpexp(r, s, p, rs); + mpmul(v1, rs, v1); + mpmod(v1, p, v1); + mpexp(alpha, m, p, v2); + if(mpcmp(v1, v2) == 0) + rv = 0; + mpfree(v1); + mpfree(rs); + mpfree(v2); + return rv; +} |