extern size_t ecdsa_size(ecdsa_t *ecdsa);
extern bool ecdsa_sign(ecdsa_t *ecdsa, const void *in, size_t inlen, void *out) ATTR_WARN_UNUSED;
extern bool ecdsa_verify(ecdsa_t *ecdsa, const void *in, size_t inlen, const void *out) ATTR_WARN_UNUSED;
extern bool ecdsa_active(ecdsa_t *ecdsa);
extern size_t ecdsa_size(ecdsa_t *ecdsa);
extern bool ecdsa_sign(ecdsa_t *ecdsa, const void *in, size_t inlen, void *out) ATTR_WARN_UNUSED;
extern bool ecdsa_verify(ecdsa_t *ecdsa, const void *in, size_t inlen, const void *out) ATTR_WARN_UNUSED;
extern bool ecdsa_active(ecdsa_t *ecdsa);