ssh_digest_start
struct ssh_digest_ctx *ctx = ssh_digest_start(alg);
struct ssh_digest_ctx *ssh_digest_start(int alg);
if ((ret->ictx = ssh_digest_start(alg)) == NULL ||
(ret->octx = ssh_digest_start(alg)) == NULL ||
(ret->digest = ssh_digest_start(alg)) == NULL)
if ((hashctx = ssh_digest_start(kex->hash_alg)) == NULL ||
if ((hashctx = ssh_digest_start(kex->hash_alg)) == NULL ||
if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL ||
if (ctx == NULL && (ctx = ssh_digest_start(SSH_DIGEST_SHA512)) == NULL)
if ((ctx = ssh_digest_start(alg)) == NULL) {