diff options
Diffstat (limited to 'crypto/ecdsa/ecs_vrf.c')
| -rw-r--r-- | crypto/ecdsa/ecs_vrf.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/crypto/ecdsa/ecs_vrf.c b/crypto/ecdsa/ecs_vrf.c index ef9acf7..188b9d5 100644 --- a/crypto/ecdsa/ecs_vrf.c +++ b/crypto/ecdsa/ecs_vrf.c @@ -57,6 +57,7 @@ */ #include "ecs_locl.h" +#include <string.h> #ifndef OPENSSL_NO_ENGINE #include <openssl/engine.h> #endif @@ -84,13 +85,25 @@ int ECDSA_verify(int type, const unsigned char *dgst, int dgst_len, const unsigned char *sigbuf, int sig_len, EC_KEY *eckey) { ECDSA_SIG *s; + const unsigned char *p = sigbuf; + unsigned char *der = NULL; + int derlen = -1; int ret=-1; s = ECDSA_SIG_new(); if (s == NULL) return(ret); - if (d2i_ECDSA_SIG(&s, &sigbuf, sig_len) == NULL) goto err; + if (d2i_ECDSA_SIG(&s, &p, sig_len) == NULL) goto err; + /* Ensure signature uses DER and doesn't have trailing garbage */ + derlen = i2d_ECDSA_SIG(s, &der); + if (derlen != sig_len || memcmp(sigbuf, der, derlen)) + goto err; ret=ECDSA_do_verify(dgst, dgst_len, s, eckey); err: + if (derlen > 0) + { + OPENSSL_cleanse(der, derlen); + OPENSSL_free(der); + } ECDSA_SIG_free(s); return(ret); } |