IABSD.fr/src/usr.bin/ssh/ssh-rsa.c

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• Author : jsg
  Date : 2026-02-14 00:18:34
  Hash : dd4215a7
  Message : remove unneeded includes; ok dtucker@

• usr.bin/ssh/ssh-rsa.c

• /* $OpenBSD: ssh-rsa.c,v 1.84 2026/02/14 00:18:34 jsg Exp $ */
  /*
   * Copyright (c) 2000, 2003 Markus Friedl <markus@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <sys/types.h>
  
  #include <openssl/bn.h>
  #include <openssl/evp.h>
  
  #include <stdarg.h>
  #include <string.h>
  
  #include "sshbuf.h"
  #include "ssherr.h"
  #define SSHKEY_INTERNAL
  #include "sshkey.h"
  #include "digest.h"
  
  static u_int
  ssh_rsa_size(const struct sshkey *k)
  {
  	if (k->pkey == NULL)
  		return 0;
  	return EVP_PKEY_bits(k->pkey);
  }
  
  static int
  ssh_rsa_alloc(struct sshkey *k)
  {
  	if ((k->pkey = EVP_PKEY_new()) == NULL)
  		return SSH_ERR_ALLOC_FAIL;
  	return 0;
  }
  
  static void
  ssh_rsa_cleanup(struct sshkey *k)
  {
  	EVP_PKEY_free(k->pkey);
  	k->pkey = NULL;
  }
  
  static int
  ssh_rsa_equal(const struct sshkey *a, const struct sshkey *b)
  {
  	if (a->pkey == NULL || b->pkey == NULL)
  		return 0;
  	return EVP_PKEY_cmp(a->pkey, b->pkey) == 1;
  }
  
  static int
  ssh_rsa_serialize_public(const struct sshkey *key, struct sshbuf *b,
      enum sshkey_serialize_rep opts)
  {
  	int r;
  	const BIGNUM *rsa_n, *rsa_e;
  	const RSA *rsa;
  
  	if (key->pkey == NULL)
  		return SSH_ERR_INVALID_ARGUMENT;
  	if ((rsa = EVP_PKEY_get0_RSA(key->pkey)) == NULL)
  		return SSH_ERR_LIBCRYPTO_ERROR;
  
  	RSA_get0_key(rsa, &rsa_n, &rsa_e, NULL);
  	if ((r = sshbuf_put_bignum2(b, rsa_e)) != 0 ||
  	    (r = sshbuf_put_bignum2(b, rsa_n)) != 0)
  		return r;
  
  	return 0;
  }
  
  static int
  ssh_rsa_serialize_private(const struct sshkey *key, struct sshbuf *b,
      enum sshkey_serialize_rep opts)
  {
  	int r;
  	const BIGNUM *rsa_n, *rsa_e, *rsa_d, *rsa_iqmp, *rsa_p, *rsa_q;
  	const RSA *rsa;
  
  	if ((rsa = EVP_PKEY_get0_RSA(key->pkey)) == NULL)
  		return SSH_ERR_LIBCRYPTO_ERROR;
  	RSA_get0_key(rsa, &rsa_n, &rsa_e, &rsa_d);
  	RSA_get0_factors(rsa, &rsa_p, &rsa_q);
  	RSA_get0_crt_params(rsa, NULL, NULL, &rsa_iqmp);
  
  	if (!sshkey_is_cert(key)) {
  		/* Note: can't reuse ssh_rsa_serialize_public: e, n vs. n, e */
  		if ((r = sshbuf_put_bignum2(b, rsa_n)) != 0 ||
  		    (r = sshbuf_put_bignum2(b, rsa_e)) != 0)
  			return r;
  	}
  	if ((r = sshbuf_put_bignum2(b, rsa_d)) != 0 ||
  	    (r = sshbuf_put_bignum2(b, rsa_iqmp)) != 0 ||
  	    (r = sshbuf_put_bignum2(b, rsa_p)) != 0 ||
  	    (r = sshbuf_put_bignum2(b, rsa_q)) != 0)
  		return r;
  
  	return 0;
  }
  
  static int
  ssh_rsa_generate(struct sshkey *k, int bits)
  {
  	EVP_PKEY_CTX *ctx = NULL;
  	EVP_PKEY *res = NULL;
  
  	int ret = SSH_ERR_INTERNAL_ERROR;
  
  	if (bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
  	    bits > SSHBUF_MAX_BIGNUM * 8)
  		return SSH_ERR_KEY_LENGTH;
  
  	if ((ctx = EVP_PKEY_CTX_new_id(EVP_PKEY_RSA, NULL)) == NULL) {
  		ret = SSH_ERR_ALLOC_FAIL;
  		goto out;
  	}
  	if (EVP_PKEY_keygen_init(ctx) <= 0) {
  		ret = SSH_ERR_LIBCRYPTO_ERROR;
  		goto out;
  	}
  	if (EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, bits) <= 0) {
  		ret = SSH_ERR_KEY_LENGTH;
  		goto out;
  	}
  	if (EVP_PKEY_keygen(ctx, &res) <= 0 || res == NULL) {
  		ret = SSH_ERR_LIBCRYPTO_ERROR;
  		goto out;
  	}
  	/* success */
  	k->pkey = res;
  	ret = 0;
   out:
  	EVP_PKEY_CTX_free(ctx);
  	return ret;
  }
  
  static int
  ssh_rsa_copy_public(const struct sshkey *from, struct sshkey *to)
  {
  	const BIGNUM *rsa_n, *rsa_e;
  	BIGNUM *rsa_n_dup = NULL, *rsa_e_dup = NULL;
  	int r = SSH_ERR_INTERNAL_ERROR;
  	const RSA *rsa_from;
  	RSA *rsa_to = NULL;
  
  	if ((rsa_from = EVP_PKEY_get0_RSA(from->pkey)) == NULL ||
  	    (rsa_to = RSA_new()) == NULL)
  		return SSH_ERR_LIBCRYPTO_ERROR;
  
  	RSA_get0_key(rsa_from, &rsa_n, &rsa_e, NULL);
  	if ((rsa_n_dup = BN_dup(rsa_n)) == NULL ||
  	    (rsa_e_dup = BN_dup(rsa_e)) == NULL) {
  		r = SSH_ERR_ALLOC_FAIL;
  		goto out;
  	}
  	if (!RSA_set0_key(rsa_to, rsa_n_dup, rsa_e_dup, NULL)) {
  		r = SSH_ERR_LIBCRYPTO_ERROR;
  		goto out;
  	}
  	rsa_n_dup = rsa_e_dup = NULL; /* transferred */
  
  	if (EVP_PKEY_set1_RSA(to->pkey, rsa_to) != 1) {
  		r = SSH_ERR_LIBCRYPTO_ERROR;
  		goto out;
  	}
  	/* success */
  	r = 0;
   out:
  	RSA_free(rsa_to);
  	BN_clear_free(rsa_n_dup);
  	BN_clear_free(rsa_e_dup);
  	return r;
  }
  
  static int
  ssh_rsa_deserialize_public(const char *ktype, struct sshbuf *b,
      struct sshkey *key)
  {
  	int ret = SSH_ERR_INTERNAL_ERROR;
  	BIGNUM *rsa_n = NULL, *rsa_e = NULL;
  	RSA *rsa = NULL;
  
  	if ((rsa = RSA_new()) == NULL)
  		return SSH_ERR_LIBCRYPTO_ERROR;
  
  	if (sshbuf_get_bignum2(b, &rsa_e) != 0 ||
  	    sshbuf_get_bignum2(b, &rsa_n) != 0) {
  		ret = SSH_ERR_INVALID_FORMAT;
  		goto out;
  	}
  	if (!RSA_set0_key(rsa, rsa_n, rsa_e, NULL)) {
  		ret = SSH_ERR_LIBCRYPTO_ERROR;
  		goto out;
  	}
  	rsa_n = rsa_e = NULL; /* transferred */
  	if (EVP_PKEY_set1_RSA(key->pkey, rsa) != 1) {
  		ret = SSH_ERR_LIBCRYPTO_ERROR;
  		goto out;
  	}
  	if ((ret = sshkey_check_rsa_length(key, 0)) != 0)
  		goto out;
  #ifdef DEBUG_PK
  	RSA_print_fp(stderr, rsa, 8);
  #endif
  	/* success */
  	ret = 0;
   out:
  	RSA_free(rsa);
  	BN_clear_free(rsa_n);
  	BN_clear_free(rsa_e);
  	return ret;
  }
  
  static int
  ssh_rsa_deserialize_private(const char *ktype, struct sshbuf *b,
      struct sshkey *key)
  {
  	int r;
  	BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
  	BIGNUM *rsa_iqmp = NULL, *rsa_p = NULL, *rsa_q = NULL;
  	BIGNUM *rsa_dmp1 = NULL, *rsa_dmq1 = NULL;
  	RSA *rsa = NULL;
  
  	if (sshkey_is_cert(key)) {
  		/* sshkey_private_deserialize already has pubkey from cert */
  		if ((rsa = EVP_PKEY_get1_RSA(key->pkey)) == NULL) {
  			r = SSH_ERR_LIBCRYPTO_ERROR;
  			goto out;
  		}
  	} else {
  		if ((rsa = RSA_new()) == NULL) {
  			r = SSH_ERR_LIBCRYPTO_ERROR;
  			goto out;
  		}
  		/* Note: can't reuse ssh_rsa_deserialize_public: e,n vs. n,e */
  		if ((r = sshbuf_get_bignum2(b, &rsa_n)) != 0 ||
  		    (r = sshbuf_get_bignum2(b, &rsa_e)) != 0)
  			goto out;
  		if (!RSA_set0_key(rsa, rsa_n, rsa_e, NULL)) {
  			r = SSH_ERR_LIBCRYPTO_ERROR;
  			goto out;
  		}
  		rsa_n = rsa_e = NULL; /* transferred */
  	}
  	if ((r = sshbuf_get_bignum2(b, &rsa_d)) != 0 ||
  	    (r = sshbuf_get_bignum2(b, &rsa_iqmp)) != 0 ||
  	    (r = sshbuf_get_bignum2(b, &rsa_p)) != 0 ||
  	    (r = sshbuf_get_bignum2(b, &rsa_q)) != 0)
  		goto out;
  	if ((r = ssh_rsa_complete_crt_parameters(rsa_d, rsa_p, rsa_q,
  	    rsa_iqmp, &rsa_dmp1, &rsa_dmq1)) != 0)
  		goto out;
  	if (!RSA_set0_key(rsa, NULL, NULL, rsa_d)) {
  		r = SSH_ERR_LIBCRYPTO_ERROR;
  		goto out;
  	}
  	rsa_d = NULL; /* transferred */
  	if (!RSA_set0_factors(rsa, rsa_p, rsa_q)) {
  		r = SSH_ERR_LIBCRYPTO_ERROR;
  		goto out;
  	}
  	rsa_p = rsa_q = NULL; /* transferred */
  	if (!RSA_set0_crt_params(rsa, rsa_dmp1, rsa_dmq1, rsa_iqmp)) {
  		r = SSH_ERR_LIBCRYPTO_ERROR;
  		goto out;
  	}
  	rsa_dmp1 = rsa_dmq1 = rsa_iqmp = NULL;
  	if (RSA_blinding_on(rsa, NULL) != 1) {
  		r = SSH_ERR_LIBCRYPTO_ERROR;
  		goto out;
  	}
  	if (EVP_PKEY_set1_RSA(key->pkey, rsa) != 1) {
  		r = SSH_ERR_LIBCRYPTO_ERROR;
  		goto out;
  	}
  	if ((r = sshkey_check_rsa_length(key, 0)) != 0)
  		goto out;
  	/* success */
  	r = 0;
   out:
  	RSA_free(rsa);
  	BN_clear_free(rsa_n);
  	BN_clear_free(rsa_e);
  	BN_clear_free(rsa_d);
  	BN_clear_free(rsa_p);
  	BN_clear_free(rsa_q);
  	BN_clear_free(rsa_iqmp);
  	BN_clear_free(rsa_dmp1);
  	BN_clear_free(rsa_dmq1);
  	return r;
  }
  
  const char *
  ssh_rsa_hash_alg_ident(int hash_alg)
  {
  	switch (hash_alg) {
  	case SSH_DIGEST_SHA1:
  		return "ssh-rsa";
  	case SSH_DIGEST_SHA256:
  		return "rsa-sha2-256";
  	case SSH_DIGEST_SHA512:
  		return "rsa-sha2-512";
  	}
  	return NULL;
  }
  
  /*
   * Returns the hash algorithm ID for a given algorithm identifier as used
   * inside the signature blob,
   */
  static int
  rsa_hash_id_from_ident(const char *ident)
  {
  	if (strcmp(ident, "ssh-rsa") == 0)
  		return SSH_DIGEST_SHA1;
  	if (strcmp(ident, "rsa-sha2-256") == 0)
  		return SSH_DIGEST_SHA256;
  	if (strcmp(ident, "rsa-sha2-512") == 0)
  		return SSH_DIGEST_SHA512;
  	return -1;
  }
  
  /*
   * Return the hash algorithm ID for the specified key name. This includes
   * all the cases of rsa_hash_id_from_ident() but also the certificate key
   * types.
   */
  int
  ssh_rsa_hash_id_from_keyname(const char *alg)
  {
  	int r;
  
  	if ((r = rsa_hash_id_from_ident(alg)) != -1)
  		return r;
  	if (strcmp(alg, "ssh-rsa-cert-v01@openssh.com") == 0)
  		return SSH_DIGEST_SHA1;
  	if (strcmp(alg, "rsa-sha2-256-cert-v01@openssh.com") == 0)
  		return SSH_DIGEST_SHA256;
  	if (strcmp(alg, "rsa-sha2-512-cert-v01@openssh.com") == 0)
  		return SSH_DIGEST_SHA512;
  	return -1;
  }
  
  int
  ssh_rsa_complete_crt_parameters(const BIGNUM *rsa_d, const BIGNUM *rsa_p,
      const BIGNUM *rsa_q, const BIGNUM *rsa_iqmp, BIGNUM **rsa_dmp1,
      BIGNUM **rsa_dmq1)
  {
  	BIGNUM *aux = NULL, *d_consttime = NULL;
  	BN_CTX *ctx = NULL;
  	int r;
  
  	*rsa_dmq1 = *rsa_dmp1 = NULL;
  	if ((ctx = BN_CTX_new()) == NULL)
  		return SSH_ERR_ALLOC_FAIL;
  	if ((aux = BN_new()) == NULL ||
  	    (*rsa_dmq1 = BN_new()) == NULL ||
  	    (*rsa_dmp1 = BN_new()) == NULL)
  		return SSH_ERR_ALLOC_FAIL;
  	if ((d_consttime = BN_dup(rsa_d)) == NULL) {
  		r = SSH_ERR_ALLOC_FAIL;
  		goto out;
  	}
  	BN_set_flags(aux, BN_FLG_CONSTTIME);
  	BN_set_flags(d_consttime, BN_FLG_CONSTTIME);
  
  	if ((BN_sub(aux, rsa_q, BN_value_one()) == 0) ||
  	    (BN_mod(*rsa_dmq1, d_consttime, aux, ctx) == 0) ||
  	    (BN_sub(aux, rsa_p, BN_value_one()) == 0) ||
  	    (BN_mod(*rsa_dmp1, d_consttime, aux, ctx) == 0)) {
  		r = SSH_ERR_LIBCRYPTO_ERROR;
  		goto out;
  	}
  	/* success */
  	r = 0;
   out:
  	BN_clear_free(aux);
  	BN_clear_free(d_consttime);
  	BN_CTX_free(ctx);
  	return r;
  }
  
  /* RSASSA-PKCS1-v1_5 (PKCS #1 v2.0 signature) with SHA1 */
  static int
  ssh_rsa_sign(struct sshkey *key,
      u_char **sigp, size_t *lenp,
      const u_char *data, size_t datalen,
      const char *alg, const char *sk_provider, const char *sk_pin, u_int compat)
  {
  	u_char *sig = NULL;
  	size_t diff, len = 0;
  	int slen = 0;
  	int hash_alg, ret = SSH_ERR_INTERNAL_ERROR;
  
  	if (lenp != NULL)
  		*lenp = 0;
  	if (sigp != NULL)
  		*sigp = NULL;
  
  	if (alg == NULL || strlen(alg) == 0)
  		hash_alg = SSH_DIGEST_SHA1;
  	else
  		hash_alg = ssh_rsa_hash_id_from_keyname(alg);
  
  	if (key == NULL || key->pkey == NULL || hash_alg == -1 ||
  	    sshkey_type_plain(key->type) != KEY_RSA)
  		return SSH_ERR_INVALID_ARGUMENT;
  	slen = EVP_PKEY_size(key->pkey);
  	if (slen <= 0 || slen > SSHBUF_MAX_BIGNUM)
  		return SSH_ERR_INVALID_ARGUMENT;
  	if (EVP_PKEY_bits(key->pkey) < SSH_RSA_MINIMUM_MODULUS_SIZE)
  		return SSH_ERR_KEY_LENGTH;
  
  	if ((ret = sshkey_pkey_digest_sign(key->pkey, hash_alg, &sig, &len,
  	    data, datalen)) < 0)
  		goto out;
  	if (len < (size_t)slen) {
  		diff = slen - len;
  		memmove(sig + diff, sig, len);
  		explicit_bzero(sig, diff);
  	} else if (len > (size_t)slen) {
  		ret = SSH_ERR_INTERNAL_ERROR;
  		goto out;
  	}
  	if ((ret = ssh_rsa_encode_store_sig(hash_alg, sig, slen,
  	    sigp, lenp)) != 0)
  		goto out;
  
  	/* success */
  	ret = 0;
   out:
  	freezero(sig, slen);
  	return ret;
  }
  
  int
  ssh_rsa_encode_store_sig(int hash_alg, const u_char *sig, size_t slen,
      u_char **sigp, size_t *lenp)
  {
  	struct sshbuf *b = NULL;
  	int ret = SSH_ERR_INTERNAL_ERROR;
  	size_t len;
  
  	if (lenp != NULL)
  		*lenp = 0;
  	if (sigp != NULL)
  		*sigp = NULL;
  
  	/* Encode signature */
  	if ((b = sshbuf_new()) == NULL) {
  		ret = SSH_ERR_ALLOC_FAIL;
  		goto out;
  	}
  	if ((ret = sshbuf_put_cstring(b,
  	    ssh_rsa_hash_alg_ident(hash_alg))) != 0 ||
  	    (ret = sshbuf_put_string(b, sig, slen)) != 0)
  		goto out;
  	len = sshbuf_len(b);
  
  	/* Store signature */
  	if (sigp != NULL) {
  		if ((*sigp = malloc(len)) == NULL) {
  			ret = SSH_ERR_ALLOC_FAIL;
  			goto out;
  		}
  		memcpy(*sigp, sshbuf_ptr(b), len);
  	}
  	if (lenp != NULL)
  		*lenp = len;
  	ret = 0;
   out:
  	sshbuf_free(b);
  	return ret;
  }
  
  static int
  ssh_rsa_verify(const struct sshkey *key,
      const u_char *sig, size_t siglen,
      const u_char *data, size_t dlen, const char *alg, u_int compat,
      struct sshkey_sig_details **detailsp)
  {
  	char *sigtype = NULL;
  	int hash_alg, want_alg, ret = SSH_ERR_INTERNAL_ERROR;
  	size_t len = 0, diff, modlen, rsasize;
  	struct sshbuf *b = NULL;
  	u_char digest[SSH_DIGEST_MAX_LENGTH], *osigblob, *sigblob = NULL;
  
  	if (key == NULL || key->pkey == NULL ||
  	    sshkey_type_plain(key->type) != KEY_RSA ||
  	    sig == NULL || siglen == 0)
  		return SSH_ERR_INVALID_ARGUMENT;
  	if (EVP_PKEY_bits(key->pkey) < SSH_RSA_MINIMUM_MODULUS_SIZE)
  		return SSH_ERR_KEY_LENGTH;
  
  	if ((b = sshbuf_from(sig, siglen)) == NULL)
  		return SSH_ERR_ALLOC_FAIL;
  	if (sshbuf_get_cstring(b, &sigtype, NULL) != 0) {
  		ret = SSH_ERR_INVALID_FORMAT;
  		goto out;
  	}
  	if ((hash_alg = rsa_hash_id_from_ident(sigtype)) == -1) {
  		ret = SSH_ERR_KEY_TYPE_MISMATCH;
  		goto out;
  	}
  	/*
  	 * Allow ssh-rsa-cert-v01 certs to generate SHA2 signatures for
  	 * legacy reasons, but otherwise the signature type should match.
  	 */
  	if (alg != NULL && strcmp(alg, "ssh-rsa-cert-v01@openssh.com") != 0) {
  		if ((want_alg = ssh_rsa_hash_id_from_keyname(alg)) == -1) {
  			ret = SSH_ERR_INVALID_ARGUMENT;
  			goto out;
  		}
  		if (hash_alg != want_alg) {
  			ret = SSH_ERR_SIGNATURE_INVALID;
  			goto out;
  		}
  	}
  	if (sshbuf_get_string(b, &sigblob, &len) != 0) {
  		ret = SSH_ERR_INVALID_FORMAT;
  		goto out;
  	}
  	if (sshbuf_len(b) != 0) {
  		ret = SSH_ERR_UNEXPECTED_TRAILING_DATA;
  		goto out;
  	}
  	/* RSA_verify expects a signature of RSA_size */
  	modlen = EVP_PKEY_size(key->pkey);
  	if (len > modlen) {
  		ret = SSH_ERR_KEY_BITS_MISMATCH;
  		goto out;
  	} else if (len < modlen) {
  		diff = modlen - len;
  		osigblob = sigblob;
  		if ((sigblob = realloc(sigblob, modlen)) == NULL) {
  			sigblob = osigblob; /* put it back for clear/free */
  			ret = SSH_ERR_ALLOC_FAIL;
  			goto out;
  		}
  		memmove(sigblob + diff, sigblob, len);
  		explicit_bzero(sigblob, diff);
  		len = modlen;
  	}
  
  	rsasize = EVP_PKEY_size(key->pkey);
  	if (rsasize <= 0 || rsasize > SSHBUF_MAX_BIGNUM ||
  	    len == 0 || len > rsasize) {
  		ret = SSH_ERR_INVALID_ARGUMENT;
  		goto out;
  	}
  	ret = sshkey_pkey_digest_verify(key->pkey, hash_alg, data, dlen,
  	    sigblob, len);
  
   out:
  	freezero(sigblob, len);
  	free(sigtype);
  	sshbuf_free(b);
  	explicit_bzero(digest, sizeof(digest));
  	return ret;
  }
  
  static const struct sshkey_impl_funcs sshkey_rsa_funcs = {
  	/* .size = */		ssh_rsa_size,
  	/* .alloc = */		ssh_rsa_alloc,
  	/* .cleanup = */	ssh_rsa_cleanup,
  	/* .equal = */		ssh_rsa_equal,
  	/* .ssh_serialize_public = */ ssh_rsa_serialize_public,
  	/* .ssh_deserialize_public = */ ssh_rsa_deserialize_public,
  	/* .ssh_serialize_private = */ ssh_rsa_serialize_private,
  	/* .ssh_deserialize_private = */ ssh_rsa_deserialize_private,
  	/* .generate = */	ssh_rsa_generate,
  	/* .copy_public = */	ssh_rsa_copy_public,
  	/* .sign = */		ssh_rsa_sign,
  	/* .verify = */		ssh_rsa_verify,
  };
  
  const struct sshkey_impl sshkey_rsa_impl = {
  	/* .name = */		"ssh-rsa",
  	/* .shortname = */	"RSA",
  	/* .sigalg = */		NULL,
  	/* .type = */		KEY_RSA,
  	/* .nid = */		0,
  	/* .cert = */		0,
  	/* .sigonly = */	0,
  	/* .keybits = */	0,
  	/* .funcs = */		&sshkey_rsa_funcs,
  };
  
  const struct sshkey_impl sshkey_rsa_cert_impl = {
  	/* .name = */		"ssh-rsa-cert-v01@openssh.com",
  	/* .shortname = */	"RSA-CERT",
  	/* .sigalg = */		NULL,
  	/* .type = */		KEY_RSA_CERT,
  	/* .nid = */		0,
  	/* .cert = */		1,
  	/* .sigonly = */	0,
  	/* .keybits = */	0,
  	/* .funcs = */		&sshkey_rsa_funcs,
  };
  
  /* SHA2 signature algorithms */
  
  const struct sshkey_impl sshkey_rsa_sha256_impl = {
  	/* .name = */		"rsa-sha2-256",
  	/* .shortname = */	"RSA",
  	/* .sigalg = */		NULL,
  	/* .type = */		KEY_RSA,
  	/* .nid = */		0,
  	/* .cert = */		0,
  	/* .sigonly = */	1,
  	/* .keybits = */	0,
  	/* .funcs = */		&sshkey_rsa_funcs,
  };
  
  const struct sshkey_impl sshkey_rsa_sha512_impl = {
  	/* .name = */		"rsa-sha2-512",
  	/* .shortname = */	"RSA",
  	/* .sigalg = */		NULL,
  	/* .type = */		KEY_RSA,
  	/* .nid = */		0,
  	/* .cert = */		0,
  	/* .sigonly = */	1,
  	/* .keybits = */	0,
  	/* .funcs = */		&sshkey_rsa_funcs,
  };
  
  const struct sshkey_impl sshkey_rsa_sha256_cert_impl = {
  	/* .name = */		"rsa-sha2-256-cert-v01@openssh.com",
  	/* .shortname = */	"RSA-CERT",
  	/* .sigalg = */		"rsa-sha2-256",
  	/* .type = */		KEY_RSA_CERT,
  	/* .nid = */		0,
  	/* .cert = */		1,
  	/* .sigonly = */	1,
  	/* .keybits = */	0,
  	/* .funcs = */		&sshkey_rsa_funcs,
  };
  
  const struct sshkey_impl sshkey_rsa_sha512_cert_impl = {
  	/* .name = */		"rsa-sha2-512-cert-v01@openssh.com",
  	/* .shortname = */	"RSA-CERT",
  	/* .sigalg = */		"rsa-sha2-512",
  	/* .type = */		KEY_RSA_CERT,
  	/* .nid = */		0,
  	/* .cert = */		1,
  	/* .sigonly = */	1,
  	/* .keybits = */	0,
  	/* .funcs = */		&sshkey_rsa_funcs,
  };