[u-boot.git] / lib / rsa / rsa-sign.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2013, Google Inc.
 */

#include "mkimage.h"
#include <stdio.h>
#include <string.h>
#include <image.h>
#include <time.h>
#include <openssl/bn.h>
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#include <openssl/ssl.h>
#include <openssl/evp.h>
#include <openssl/engine.h>

#if OPENSSL_VERSION_NUMBER >= 0x10000000L
#define HAVE_ERR_REMOVE_THREAD_STATE
#endif

#if OPENSSL_VERSION_NUMBER < 0x10100000L
static void RSA_get0_key(const RSA *r,
                 const BIGNUM **n, const BIGNUM **e, const BIGNUM **d)
{
   if (n != NULL)
       *n = r->n;
   if (e != NULL)
       *e = r->e;
   if (d != NULL)
       *d = r->d;
}
#endif

static int rsa_err(const char *msg)
{
	unsigned long sslErr = ERR_get_error();

	fprintf(stderr, "%s", msg);
	fprintf(stderr, ": %s\n",
		ERR_error_string(sslErr, 0));

	return -1;
}

/**
 * rsa_pem_get_pub_key() - read a public key from a .crt file
 *
 * @keydir:	Directory containins the key
 * @name	Name of key file (will have a .crt extension)
 * @rsap	Returns RSA object, or NULL on failure
 * @return 0 if ok, -ve on error (in which case *rsap will be set to NULL)
 */
static int rsa_pem_get_pub_key(const char *keydir, const char *name, RSA **rsap)
{
	char path[1024];
	EVP_PKEY *key;
	X509 *cert;
	RSA *rsa;
	FILE *f;
	int ret;

	*rsap = NULL;
	snprintf(path, sizeof(path), "%s/%s.crt", keydir, name);
	f = fopen(path, "r");
	if (!f) {
		fprintf(stderr, "Couldn't open RSA certificate: '%s': %s\n",
			path, strerror(errno));
		return -EACCES;
	}

	/* Read the certificate */
	cert = NULL;
	if (!PEM_read_X509(f, &cert, NULL, NULL)) {
		rsa_err("Couldn't read certificate");
		ret = -EINVAL;
		goto err_cert;
	}

	/* Get the public key from the certificate. */
	key = X509_get_pubkey(cert);
	if (!key) {
		rsa_err("Couldn't read public key\n");
		ret = -EINVAL;
		goto err_pubkey;
	}

	/* Convert to a RSA_style key. */
	rsa = EVP_PKEY_get1_RSA(key);
	if (!rsa) {
		rsa_err("Couldn't convert to a RSA style key");
		ret = -EINVAL;
		goto err_rsa;
	}
	fclose(f);
	EVP_PKEY_free(key);
	X509_free(cert);
	*rsap = rsa;

	return 0;

err_rsa:
	EVP_PKEY_free(key);
err_pubkey:
	X509_free(cert);
err_cert:
	fclose(f);
	return ret;
}

/**
 * rsa_engine_get_pub_key() - read a public key from given engine
 *
 * @keydir:	Key prefix
 * @name	Name of key
 * @engine	Engine to use
 * @rsap	Returns RSA object, or NULL on failure
 * @return 0 if ok, -ve on error (in which case *rsap will be set to NULL)
 */
static int rsa_engine_get_pub_key(const char *keydir, const char *name,
				  ENGINE *engine, RSA **rsap)
{
	const char *engine_id;
	char key_id[1024];
	EVP_PKEY *key;
	RSA *rsa;
	int ret;

	*rsap = NULL;

	engine_id = ENGINE_get_id(engine);

	if (engine_id && !strcmp(engine_id, "pkcs11")) {
		if (keydir)
			snprintf(key_id, sizeof(key_id),
				 "pkcs11:%s;object=%s;type=public",
				 keydir, name);
		else
			snprintf(key_id, sizeof(key_id),
				 "pkcs11:object=%s;type=public",
				 name);
	} else {
		fprintf(stderr, "Engine not supported\n");
		return -ENOTSUP;
	}

	key = ENGINE_load_public_key(engine, key_id, NULL, NULL);
	if (!key)
		return rsa_err("Failure loading public key from engine");

	/* Convert to a RSA_style key. */
	rsa = EVP_PKEY_get1_RSA(key);
	if (!rsa) {
		rsa_err("Couldn't convert to a RSA style key");
		ret = -EINVAL;
		goto err_rsa;
	}

	EVP_PKEY_free(key);
	*rsap = rsa;

	return 0;

err_rsa:
	EVP_PKEY_free(key);
	return ret;
}

/**
 * rsa_get_pub_key() - read a public key
 *
 * @keydir:	Directory containing the key (PEM file) or key prefix (engine)
 * @name	Name of key file (will have a .crt extension)
 * @engine	Engine to use
 * @rsap	Returns RSA object, or NULL on failure
 * @return 0 if ok, -ve on error (in which case *rsap will be set to NULL)
 */
static int rsa_get_pub_key(const char *keydir, const char *name,
			   ENGINE *engine, RSA **rsap)
{
	if (engine)
		return rsa_engine_get_pub_key(keydir, name, engine, rsap);
	return rsa_pem_get_pub_key(keydir, name, rsap);
}

/**
 * rsa_pem_get_priv_key() - read a private key from a .key file
 *
 * @keydir:	Directory containing the key
 * @name	Name of key file (will have a .key extension)
 * @rsap	Returns RSA object, or NULL on failure
 * @return 0 if ok, -ve on error (in which case *rsap will be set to NULL)
 */
static int rsa_pem_get_priv_key(const char *keydir, const char *name,
				RSA **rsap)
{
	char path[1024];
	RSA *rsa;
	FILE *f;

	*rsap = NULL;
	snprintf(path, sizeof(path), "%s/%s.key", keydir, name);
	f = fopen(path, "r");
	if (!f) {
		fprintf(stderr, "Couldn't open RSA private key: '%s': %s\n",
			path, strerror(errno));
		return -ENOENT;
	}

	rsa = PEM_read_RSAPrivateKey(f, 0, NULL, path);
	if (!rsa) {
		rsa_err("Failure reading private key");
		fclose(f);
		return -EPROTO;
	}
	fclose(f);
	*rsap = rsa;

	return 0;
}

/**
 * rsa_engine_get_priv_key() - read a private key from given engine
 *
 * @keydir:	Key prefix
 * @name	Name of key
 * @engine	Engine to use
 * @rsap	Returns RSA object, or NULL on failure
 * @return 0 if ok, -ve on error (in which case *rsap will be set to NULL)
 */
static int rsa_engine_get_priv_key(const char *keydir, const char *name,
				   ENGINE *engine, RSA **rsap)
{
	const char *engine_id;
	char key_id[1024];
	EVP_PKEY *key;
	RSA *rsa;
	int ret;

	*rsap = NULL;

	engine_id = ENGINE_get_id(engine);

	if (engine_id && !strcmp(engine_id, "pkcs11")) {
		if (keydir)
			snprintf(key_id, sizeof(key_id),
				 "pkcs11:%s;object=%s;type=private",
				 keydir, name);
		else
			snprintf(key_id, sizeof(key_id),
				 "pkcs11:object=%s;type=private",
				 name);
	} else {
		fprintf(stderr, "Engine not supported\n");
		return -ENOTSUP;
	}

	key = ENGINE_load_private_key(engine, key_id, NULL, NULL);
	if (!key)
		return rsa_err("Failure loading private key from engine");

	/* Convert to a RSA_style key. */
	rsa = EVP_PKEY_get1_RSA(key);
	if (!rsa) {
		rsa_err("Couldn't convert to a RSA style key");
		ret = -EINVAL;
		goto err_rsa;
	}

	EVP_PKEY_free(key);
	*rsap = rsa;

	return 0;

err_rsa:
	EVP_PKEY_free(key);
	return ret;
}

/**
 * rsa_get_priv_key() - read a private key
 *
 * @keydir:	Directory containing the key (PEM file) or key prefix (engine)
 * @name	Name of key
 * @engine	Engine to use for signing
 * @rsap	Returns RSA object, or NULL on failure
 * @return 0 if ok, -ve on error (in which case *rsap will be set to NULL)
 */
static int rsa_get_priv_key(const char *keydir, const char *name,
			    ENGINE *engine, RSA **rsap)
{
	if (engine)
		return rsa_engine_get_priv_key(keydir, name, engine, rsap);
	return rsa_pem_get_priv_key(keydir, name, rsap);
}

static int rsa_init(void)
{
	int ret;

#if OPENSSL_VERSION_NUMBER < 0x10100000L
	ret = SSL_library_init();
#else
	ret = OPENSSL_init_ssl(0, NULL);
#endif
	if (!ret) {
		fprintf(stderr, "Failure to init SSL library\n");
		return -1;
	}
#if OPENSSL_VERSION_NUMBER < 0x10100000L
	SSL_load_error_strings();

	OpenSSL_add_all_algorithms();
	OpenSSL_add_all_digests();
	OpenSSL_add_all_ciphers();
#endif

	return 0;
}

static int rsa_engine_init(const char *engine_id, ENGINE **pe)
{
	ENGINE *e;
	int ret;

	ENGINE_load_builtin_engines();

	e = ENGINE_by_id(engine_id);
	if (!e) {
		fprintf(stderr, "Engine isn't available\n");
		ret = -1;
		goto err_engine_by_id;
	}

	if (!ENGINE_init(e)) {
		fprintf(stderr, "Couldn't initialize engine\n");
		ret = -1;
		goto err_engine_init;
	}

	if (!ENGINE_set_default_RSA(e)) {
		fprintf(stderr, "Couldn't set engine as default for RSA\n");
		ret = -1;
		goto err_set_rsa;
	}

	*pe = e;

	return 0;

err_set_rsa:
	ENGINE_finish(e);
err_engine_init:
	ENGINE_free(e);
err_engine_by_id:
#if OPENSSL_VERSION_NUMBER < 0x10100000L
	ENGINE_cleanup();
#endif
	return ret;
}

static void rsa_remove(void)
{
#if OPENSSL_VERSION_NUMBER < 0x10100000L
	CRYPTO_cleanup_all_ex_data();
	ERR_free_strings();
#ifdef HAVE_ERR_REMOVE_THREAD_STATE
	ERR_remove_thread_state(NULL);
#else
	ERR_remove_state(0);
#endif
	EVP_cleanup();
#endif
}

static void rsa_engine_remove(ENGINE *e)
{
	if (e) {
		ENGINE_finish(e);
		ENGINE_free(e);
	}
}

static int rsa_sign_with_key(RSA *rsa, struct checksum_algo *checksum_algo,
		const struct image_region region[], int region_count,
		uint8_t **sigp, uint *sig_size)
{
	EVP_PKEY *key;
	EVP_MD_CTX *context;
	int size, ret = 0;
	uint8_t *sig;
	int i;

	key = EVP_PKEY_new();
	if (!key)
		return rsa_err("EVP_PKEY object creation failed");

	if (!EVP_PKEY_set1_RSA(key, rsa)) {
		ret = rsa_err("EVP key setup failed");
		goto err_set;
	}

	size = EVP_PKEY_size(key);
	sig = malloc(size);
	if (!sig) {
		fprintf(stderr, "Out of memory for signature (%d bytes)\n",
			size);
		ret = -ENOMEM;
		goto err_alloc;
	}

	context = EVP_MD_CTX_create();
	if (!context) {
		ret = rsa_err("EVP context creation failed");
		goto err_create;
	}
	EVP_MD_CTX_init(context);
	if (!EVP_SignInit(context, checksum_algo->calculate_sign())) {
		ret = rsa_err("Signer setup failed");
		goto err_sign;
	}

	for (i = 0; i < region_count; i++) {
		if (!EVP_SignUpdate(context, region[i].data, region[i].size)) {
			ret = rsa_err("Signing data failed");
			goto err_sign;
		}
	}

	if (!EVP_SignFinal(context, sig, sig_size, key)) {
		ret = rsa_err("Could not obtain signature");
		goto err_sign;
	}
	#if OPENSSL_VERSION_NUMBER < 0x10100000L
		EVP_MD_CTX_cleanup(context);
	#else
		EVP_MD_CTX_reset(context);
	#endif
	EVP_MD_CTX_destroy(context);
	EVP_PKEY_free(key);

	debug("Got signature: %d bytes, expected %d\n", *sig_size, size);
	*sigp = sig;
	*sig_size = size;

	return 0;

err_sign:
	EVP_MD_CTX_destroy(context);
err_create:
	free(sig);
err_alloc:
err_set:
	EVP_PKEY_free(key);
	return ret;
}

int rsa_sign(struct image_sign_info *info,
	     const struct image_region region[], int region_count,
	     uint8_t **sigp, uint *sig_len)
{
	RSA *rsa;
	ENGINE *e = NULL;
	int ret;

	ret = rsa_init();
	if (ret)
		return ret;

	if (info->engine_id) {
		ret = rsa_engine_init(info->engine_id, &e);
		if (ret)
			goto err_engine;
	}

	ret = rsa_get_priv_key(info->keydir, info->keyname, e, &rsa);
	if (ret)
		goto err_priv;
	ret = rsa_sign_with_key(rsa, info->checksum, region,
				region_count, sigp, sig_len);
	if (ret)
		goto err_sign;

	RSA_free(rsa);
	if (info->engine_id)
		rsa_engine_remove(e);
	rsa_remove();

	return ret;

err_sign:
	RSA_free(rsa);
err_priv:
	if (info->engine_id)
		rsa_engine_remove(e);
err_engine:
	rsa_remove();
	return ret;
}

/*
 * rsa_get_exponent(): - Get the public exponent from an RSA key
 */
static int rsa_get_exponent(RSA *key, uint64_t *e)
{
	int ret;
	BIGNUM *bn_te;
	const BIGNUM *key_e;
	uint64_t te;

	ret = -EINVAL;
	bn_te = NULL;

	if (!e)
		goto cleanup;

	RSA_get0_key(key, NULL, &key_e, NULL);
	if (BN_num_bits(key_e) > 64)
		goto cleanup;

	*e = BN_get_word(key_e);

	if (BN_num_bits(key_e) < 33) {
		ret = 0;
		goto cleanup;
	}

	bn_te = BN_dup(key_e);
	if (!bn_te)
		goto cleanup;

	if (!BN_rshift(bn_te, bn_te, 32))
		goto cleanup;

	if (!BN_mask_bits(bn_te, 32))
		goto cleanup;

	te = BN_get_word(bn_te);
	te <<= 32;
	*e |= te;
	ret = 0;

cleanup:
	if (bn_te)
		BN_free(bn_te);

	return ret;
}

/*
 * rsa_get_params(): - Get the important parameters of an RSA public key
 */
int rsa_get_params(RSA *key, uint64_t *exponent, uint32_t *n0_invp,
		   BIGNUM **modulusp, BIGNUM **r_squaredp)
{
	BIGNUM *big1, *big2, *big32, *big2_32;
	BIGNUM *n, *r, *r_squared, *tmp;
	const BIGNUM *key_n;
	BN_CTX *bn_ctx = BN_CTX_new();
	int ret = 0;

	/* Initialize BIGNUMs */
	big1 = BN_new();
	big2 = BN_new();
	big32 = BN_new();
	r = BN_new();
	r_squared = BN_new();
	tmp = BN_new();
	big2_32 = BN_new();
	n = BN_new();
	if (!big1 || !big2 || !big32 || !r || !r_squared || !tmp || !big2_32 ||
	    !n) {
		fprintf(stderr, "Out of memory (bignum)\n");
		return -ENOMEM;
	}

	if (0 != rsa_get_exponent(key, exponent))
		ret = -1;

	RSA_get0_key(key, &key_n, NULL, NULL);
	if (!BN_copy(n, key_n) || !BN_set_word(big1, 1L) ||
	    !BN_set_word(big2, 2L) || !BN_set_word(big32, 32L))
		ret = -1;

	/* big2_32 = 2^32 */
	if (!BN_exp(big2_32, big2, big32, bn_ctx))
		ret = -1;

	/* Calculate n0_inv = -1 / n[0] mod 2^32 */
	if (!BN_mod_inverse(tmp, n, big2_32, bn_ctx) ||
	    !BN_sub(tmp, big2_32, tmp))
		ret = -1;
	*n0_invp = BN_get_word(tmp);

	/* Calculate R = 2^(# of key bits) */
	if (!BN_set_word(tmp, BN_num_bits(n)) ||
	    !BN_exp(r, big2, tmp, bn_ctx))
		ret = -1;

	/* Calculate r_squared = R^2 mod n */
	if (!BN_copy(r_squared, r) ||
	    !BN_mul(tmp, r_squared, r, bn_ctx) ||
	    !BN_mod(r_squared, tmp, n, bn_ctx))
		ret = -1;

	*modulusp = n;
	*r_squaredp = r_squared;

	BN_free(big1);
	BN_free(big2);
	BN_free(big32);
	BN_free(r);
	BN_free(tmp);
	BN_free(big2_32);
	if (ret) {
		fprintf(stderr, "Bignum operations failed\n");
		return -ENOMEM;
	}

	return ret;
}

static int fdt_add_bignum(void *blob, int noffset, const char *prop_name,
			  BIGNUM *num, int num_bits)
{
	int nwords = num_bits / 32;
	int size;
	uint32_t *buf, *ptr;
	BIGNUM *tmp, *big2, *big32, *big2_32;
	BN_CTX *ctx;
	int ret;

	tmp = BN_new();
	big2 = BN_new();
	big32 = BN_new();
	big2_32 = BN_new();
	if (!tmp || !big2 || !big32 || !big2_32) {
		fprintf(stderr, "Out of memory (bignum)\n");
		return -ENOMEM;
	}
	ctx = BN_CTX_new();
	if (!tmp) {
		fprintf(stderr, "Out of memory (bignum context)\n");
		return -ENOMEM;
	}
	BN_set_word(big2, 2L);
	BN_set_word(big32, 32L);
	BN_exp(big2_32, big2, big32, ctx); /* B = 2^32 */

	size = nwords * sizeof(uint32_t);
	buf = malloc(size);
	if (!buf) {
		fprintf(stderr, "Out of memory (%d bytes)\n", size);
		return -ENOMEM;
	}

	/* Write out modulus as big endian array of integers */
	for (ptr = buf + nwords - 1; ptr >= buf; ptr--) {
		BN_mod(tmp, num, big2_32, ctx); /* n = N mod B */
		*ptr = cpu_to_fdt32(BN_get_word(tmp));
		BN_rshift(num, num, 32); /*  N = N/B */
	}

	/*
	 * We try signing with successively increasing size values, so this
	 * might fail several times
	 */
	ret = fdt_setprop(blob, noffset, prop_name, buf, size);
	if (ret)
		return -FDT_ERR_NOSPACE;
	free(buf);
	BN_free(tmp);
	BN_free(big2);
	BN_free(big32);
	BN_free(big2_32);

	return ret;
}

int rsa_add_verify_data(struct image_sign_info *info, void *keydest)
{
	BIGNUM *modulus, *r_squared;
	uint64_t exponent;
	uint32_t n0_inv;
	int parent, node;
	char name[100];
	int ret;
	int bits;
	RSA *rsa;
	ENGINE *e = NULL;

	debug("%s: Getting verification data\n", __func__);
	if (info->engine_id) {
		ret = rsa_engine_init(info->engine_id, &e);
		if (ret)
			return ret;
	}
	ret = rsa_get_pub_key(info->keydir, info->keyname, e, &rsa);
	if (ret)
		goto err_get_pub_key;
	ret = rsa_get_params(rsa, &exponent, &n0_inv, &modulus, &r_squared);
	if (ret)
		goto err_get_params;
	bits = BN_num_bits(modulus);
	parent = fdt_subnode_offset(keydest, 0, FIT_SIG_NODENAME);
	if (parent == -FDT_ERR_NOTFOUND) {
		parent = fdt_add_subnode(keydest, 0, FIT_SIG_NODENAME);
		if (parent < 0) {
			ret = parent;
			if (ret != -FDT_ERR_NOSPACE) {
				fprintf(stderr, "Couldn't create signature node: %s\n",
					fdt_strerror(parent));
			}
		}
	}
	if (ret)
		goto done;

	/* Either create or overwrite the named key node */
	snprintf(name, sizeof(name), "key-%s", info->keyname);
	node = fdt_subnode_offset(keydest, parent, name);
	if (node == -FDT_ERR_NOTFOUND) {
		node = fdt_add_subnode(keydest, parent, name);
		if (node < 0) {
			ret = node;
			if (ret != -FDT_ERR_NOSPACE) {
				fprintf(stderr, "Could not create key subnode: %s\n",
					fdt_strerror(node));
			}
		}
	} else if (node < 0) {
		fprintf(stderr, "Cannot select keys parent: %s\n",
			fdt_strerror(node));
		ret = node;
	}

	if (!ret) {
		ret = fdt_setprop_string(keydest, node, "key-name-hint",
				 info->keyname);
	}
	if (!ret)
		ret = fdt_setprop_u32(keydest, node, "rsa,num-bits", bits);
	if (!ret)
		ret = fdt_setprop_u32(keydest, node, "rsa,n0-inverse", n0_inv);
	if (!ret) {
		ret = fdt_setprop_u64(keydest, node, "rsa,exponent", exponent);
	}
	if (!ret) {
		ret = fdt_add_bignum(keydest, node, "rsa,modulus", modulus,
				     bits);
	}
	if (!ret) {
		ret = fdt_add_bignum(keydest, node, "rsa,r-squared", r_squared,
				     bits);
	}
	if (!ret) {
		ret = fdt_setprop_string(keydest, node, FIT_ALGO_PROP,
					 info->name);
	}
	if (!ret && info->require_keys) {
		ret = fdt_setprop_string(keydest, node, "required",
					 info->require_keys);
	}
done:
	BN_free(modulus);
	BN_free(r_squared);
	if (ret)
		ret = ret == -FDT_ERR_NOSPACE ? -ENOSPC : -EIO;
err_get_params:
	RSA_free(rsa);
err_get_pub_key:
	if (info->engine_id)
		rsa_engine_remove(e);

	return ret;
}
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0+
19c402af SG	2	/*
19c402af SG	3	* Copyright (c) 2013, Google Inc.
19c402af SG	4	*/
	5
	6	#include "mkimage.h"
	7	#include <stdio.h>
	8	#include <string.h>
19c402af SG	9	#include <image.h>
19c402af SG	10	#include <time.h>
c3b43281	11	#include <openssl/bn.h>
19c402af SG	12	#include <openssl/rsa.h>
	13	#include <openssl/pem.h>
	14	#include <openssl/err.h>
	15	#include <openssl/ssl.h>
	16	#include <openssl/evp.h>
f1ca1fde	17	#include <openssl/engine.h>
19c402af SG	18
	19	#if OPENSSL_VERSION_NUMBER >= 0x10000000L
	20	#define HAVE_ERR_REMOVE_THREAD_STATE
	21	#endif
	22
c3b43281 JW	23	#if OPENSSL_VERSION_NUMBER < 0x10100000L
	24	static void RSA_get0_key(const RSA *r,
	25	const BIGNUM n, const BIGNUM e, const BIGNUM **d)
	26	{
	27	if (n != NULL)
	28	*n = r->n;
	29	if (e != NULL)
	30	*e = r->e;
	31	if (d != NULL)
	32	*d = r->d;
	33	}
	34	#endif
	35
19c402af SG	36	static int rsa_err(const char *msg)
	37	{
	38	unsigned long sslErr = ERR_get_error();
	39
	40	fprintf(stderr, "%s", msg);
	41	fprintf(stderr, ": %s\n",
	42	ERR_error_string(sslErr, 0));
	43
	44	return -1;
	45	}
	46
	47	/**
f1ca1fde	48	* rsa_pem_get_pub_key() - read a public key from a .crt file
19c402af SG	49	*
	50	* @keydir: Directory containins the key
	51	* @name Name of key file (will have a .crt extension)
	52	* @rsap Returns RSA object, or NULL on failure
	53	* @return 0 if ok, -ve on error (in which case *rsap will be set to NULL)
	54	*/
f1ca1fde	55	static int rsa_pem_get_pub_key(const char keydir, const char name, RSA **rsap)
19c402af SG	56	{
	57	char path[1024];
	58	EVP_PKEY *key;
	59	X509 *cert;
	60	RSA *rsa;
	61	FILE *f;
	62	int ret;
	63
	64	*rsap = NULL;
	65	snprintf(path, sizeof(path), "%s/%s.crt", keydir, name);
	66	f = fopen(path, "r");
	67	if (!f) {
	68	fprintf(stderr, "Couldn't open RSA certificate: '%s': %s\n",
	69	path, strerror(errno));
	70	return -EACCES;
	71	}
	72
	73	/* Read the certificate */
	74	cert = NULL;
	75	if (!PEM_read_X509(f, &cert, NULL, NULL)) {
	76	rsa_err("Couldn't read certificate");
	77	ret = -EINVAL;
	78	goto err_cert;
	79	}
	80
	81	/* Get the public key from the certificate. */
	82	key = X509_get_pubkey(cert);
	83	if (!key) {
	84	rsa_err("Couldn't read public key\n");
	85	ret = -EINVAL;
	86	goto err_pubkey;
	87	}
	88
	89	/* Convert to a RSA_style key. */
	90	rsa = EVP_PKEY_get1_RSA(key);
	91	if (!rsa) {
	92	rsa_err("Couldn't convert to a RSA style key");
54267162	93	ret = -EINVAL;
19c402af SG	94	goto err_rsa;
	95	}
	96	fclose(f);
	97	EVP_PKEY_free(key);
	98	X509_free(cert);
	99	*rsap = rsa;
	100
	101	return 0;
	102
	103	err_rsa:
	104	EVP_PKEY_free(key);
	105	err_pubkey:
	106	X509_free(cert);
	107	err_cert:
	108	fclose(f);
	109	return ret;
	110	}
	111
	112	/**
f1ca1fde	113	* rsa_engine_get_pub_key() - read a public key from given engine
19c402af	114	*
f1ca1fde GM	115	* @keydir: Key prefix
	116	* @name Name of key
	117	* @engine Engine to use
	118	* @rsap Returns RSA object, or NULL on failure
	119	* @return 0 if ok, -ve on error (in which case *rsap will be set to NULL)
	120	*/
	121	static int rsa_engine_get_pub_key(const char keydir, const char name,
	122	ENGINE engine, RSA *rsap)
	123	{
	124	const char *engine_id;
	125	char key_id[1024];
	126	EVP_PKEY *key;
	127	RSA *rsa;
	128	int ret;
	129
	130	*rsap = NULL;
	131
	132	engine_id = ENGINE_get_id(engine);
	133
	134	if (engine_id && !strcmp(engine_id, "pkcs11")) {
	135	if (keydir)
	136	snprintf(key_id, sizeof(key_id),
	137	"pkcs11:%s;object=%s;type=public",
	138	keydir, name);
	139	else
	140	snprintf(key_id, sizeof(key_id),
	141	"pkcs11:object=%s;type=public",
	142	name);
	143	} else {
	144	fprintf(stderr, "Engine not supported\n");
	145	return -ENOTSUP;
	146	}
	147
	148	key = ENGINE_load_public_key(engine, key_id, NULL, NULL);
	149	if (!key)
	150	return rsa_err("Failure loading public key from engine");
	151
	152	/* Convert to a RSA_style key. */
	153	rsa = EVP_PKEY_get1_RSA(key);
	154	if (!rsa) {
	155	rsa_err("Couldn't convert to a RSA style key");
	156	ret = -EINVAL;
	157	goto err_rsa;
	158	}
	159
	160	EVP_PKEY_free(key);
	161	*rsap = rsa;
	162
	163	return 0;
	164
	165	err_rsa:
	166	EVP_PKEY_free(key);
	167	return ret;
	168	}
	169
	170	/**
	171	* rsa_get_pub_key() - read a public key
	172	*
	173	* @keydir: Directory containing the key (PEM file) or key prefix (engine)
	174	* @name Name of key file (will have a .crt extension)
	175	* @engine Engine to use
	176	* @rsap Returns RSA object, or NULL on failure
	177	* @return 0 if ok, -ve on error (in which case *rsap will be set to NULL)
	178	*/
179	static int rsa_get_pub_key(const char keydir, const char name,
180	ENGINE engine, RSA *rsap)
181	{
182	if (engine)
183	return rsa_engine_get_pub_key(keydir, name, engine, rsap);
184	return rsa_pem_get_pub_key(keydir, name, rsap);
185	}
186
187	/**
188	* rsa_pem_get_priv_key() - read a private key from a .key file
189	*
190	* @keydir: Directory containing the key
19c402af SG	191	* @name Name of key file (will have a .key extension)
	192	* @rsap Returns RSA object, or NULL on failure
	193	* @return 0 if ok, -ve on error (in which case *rsap will be set to NULL)
	194	*/
f1ca1fde GM	195	static int rsa_pem_get_priv_key(const char keydir, const char name,
f1ca1fde GM	196	RSA **rsap)
19c402af SG	197	{
	198	char path[1024];
	199	RSA *rsa;
	200	FILE *f;
	201
	202	*rsap = NULL;
	203	snprintf(path, sizeof(path), "%s/%s.key", keydir, name);
	204	f = fopen(path, "r");
	205	if (!f) {
	206	fprintf(stderr, "Couldn't open RSA private key: '%s': %s\n",
	207	path, strerror(errno));
	208	return -ENOENT;
	209	}
	210
	211	rsa = PEM_read_RSAPrivateKey(f, 0, NULL, path);
	212	if (!rsa) {
	213	rsa_err("Failure reading private key");
	214	fclose(f);
	215	return -EPROTO;
	216	}
	217	fclose(f);
	218	*rsap = rsa;
	219
	220	return 0;
	221	}
	222
f1ca1fde GM	223	/**
	224	* rsa_engine_get_priv_key() - read a private key from given engine
	225	*
	226	* @keydir: Key prefix
	227	* @name Name of key
	228	* @engine Engine to use
	229	* @rsap Returns RSA object, or NULL on failure
	230	* @return 0 if ok, -ve on error (in which case *rsap will be set to NULL)
	231	*/
	232	static int rsa_engine_get_priv_key(const char keydir, const char name,
	233	ENGINE engine, RSA *rsap)
	234	{
	235	const char *engine_id;
	236	char key_id[1024];
	237	EVP_PKEY *key;
	238	RSA *rsa;
	239	int ret;
	240
	241	*rsap = NULL;
	242
	243	engine_id = ENGINE_get_id(engine);
	244
	245	if (engine_id && !strcmp(engine_id, "pkcs11")) {
	246	if (keydir)
	247	snprintf(key_id, sizeof(key_id),
	248	"pkcs11:%s;object=%s;type=private",
	249	keydir, name);
	250	else
	251	snprintf(key_id, sizeof(key_id),
	252	"pkcs11:object=%s;type=private",
	253	name);
	254	} else {
	255	fprintf(stderr, "Engine not supported\n");
	256	return -ENOTSUP;
	257	}
	258
	259	key = ENGINE_load_private_key(engine, key_id, NULL, NULL);
	260	if (!key)
	261	return rsa_err("Failure loading private key from engine");
	262
	263	/* Convert to a RSA_style key. */
	264	rsa = EVP_PKEY_get1_RSA(key);
	265	if (!rsa) {
	266	rsa_err("Couldn't convert to a RSA style key");
	267	ret = -EINVAL;
	268	goto err_rsa;
	269	}
	270
	271	EVP_PKEY_free(key);
	272	*rsap = rsa;
	273
	274	return 0;
	275
	276	err_rsa:
	277	EVP_PKEY_free(key);
	278	return ret;
	279	}
	280
	281	/**
	282	* rsa_get_priv_key() - read a private key
	283	*
	284	* @keydir: Directory containing the key (PEM file) or key prefix (engine)
	285	* @name Name of key
	286	* @engine Engine to use for signing
287	* @rsap Returns RSA object, or NULL on failure
288	* @return 0 if ok, -ve on error (in which case *rsap will be set to NULL)
289	*/
290	static int rsa_get_priv_key(const char keydir, const char name,
291	ENGINE engine, RSA *rsap)
292	{
293	if (engine)
294	return rsa_engine_get_priv_key(keydir, name, engine, rsap);
295	return rsa_pem_get_priv_key(keydir, name, rsap);
296	}
297
19c402af SG	298	static int rsa_init(void)
	299	{
	300	int ret;
	301
c3b43281	302	#if OPENSSL_VERSION_NUMBER < 0x10100000L
19c402af	303	ret = SSL_library_init();
c3b43281 JW	304	#else
	305	ret = OPENSSL_init_ssl(0, NULL);
	306	#endif
19c402af SG	307	if (!ret) {
	308	fprintf(stderr, "Failure to init SSL library\n");
	309	return -1;
	310	}
c3b43281	311	#if OPENSSL_VERSION_NUMBER < 0x10100000L
19c402af SG	312	SSL_load_error_strings();
	313
	314	OpenSSL_add_all_algorithms();
	315	OpenSSL_add_all_digests();
	316	OpenSSL_add_all_ciphers();
c3b43281	317	#endif
19c402af SG	318
	319	return 0;
	320	}
	321
f1ca1fde GM	322	static int rsa_engine_init(const char engine_id, ENGINE *pe)
	323	{
	324	ENGINE *e;
	325	int ret;
	326
	327	ENGINE_load_builtin_engines();
	328
	329	e = ENGINE_by_id(engine_id);
	330	if (!e) {
	331	fprintf(stderr, "Engine isn't available\n");
	332	ret = -1;
	333	goto err_engine_by_id;
	334	}
	335
	336	if (!ENGINE_init(e)) {
	337	fprintf(stderr, "Couldn't initialize engine\n");
	338	ret = -1;
	339	goto err_engine_init;
	340	}
	341
	342	if (!ENGINE_set_default_RSA(e)) {
	343	fprintf(stderr, "Couldn't set engine as default for RSA\n");
	344	ret = -1;
	345	goto err_set_rsa;
	346	}
	347
	348	*pe = e;
	349
	350	return 0;
	351
	352	err_set_rsa:
	353	ENGINE_finish(e);
	354	err_engine_init:
	355	ENGINE_free(e);
	356	err_engine_by_id:
c3b43281	357	#if OPENSSL_VERSION_NUMBER < 0x10100000L
f1ca1fde	358	ENGINE_cleanup();
c3b43281	359	#endif
f1ca1fde GM	360	return ret;
	361	}
	362
19c402af SG	363	static void rsa_remove(void)
19c402af SG	364	{
c3b43281	365	#if OPENSSL_VERSION_NUMBER < 0x10100000L
19c402af SG	366	CRYPTO_cleanup_all_ex_data();
	367	ERR_free_strings();
	368	#ifdef HAVE_ERR_REMOVE_THREAD_STATE
	369	ERR_remove_thread_state(NULL);
	370	#else
	371	ERR_remove_state(0);
	372	#endif
	373	EVP_cleanup();
c3b43281	374	#endif
19c402af SG	375	}
19c402af SG	376
f1ca1fde GM	377	static void rsa_engine_remove(ENGINE *e)
	378	{
	379	if (e) {
	380	ENGINE_finish(e);
	381	ENGINE_free(e);
	382	}
	383	}
	384
646257d1 HS	385	static int rsa_sign_with_key(RSA rsa, struct checksum_algo checksum_algo,
	386	const struct image_region region[], int region_count,
	387	uint8_t *sigp, uint sig_size)
19c402af SG	388	{
	389	EVP_PKEY *key;
	390	EVP_MD_CTX *context;
	391	int size, ret = 0;
	392	uint8_t *sig;
	393	int i;
	394
	395	key = EVP_PKEY_new();
	396	if (!key)
	397	return rsa_err("EVP_PKEY object creation failed");
	398
	399	if (!EVP_PKEY_set1_RSA(key, rsa)) {
	400	ret = rsa_err("EVP key setup failed");
	401	goto err_set;
	402	}
	403
	404	size = EVP_PKEY_size(key);
	405	sig = malloc(size);
	406	if (!sig) {
	407	fprintf(stderr, "Out of memory for signature (%d bytes)\n",
	408	size);
	409	ret = -ENOMEM;
	410	goto err_alloc;
	411	}
	412
	413	context = EVP_MD_CTX_create();
	414	if (!context) {
	415	ret = rsa_err("EVP context creation failed");
	416	goto err_create;
	417	}
	418	EVP_MD_CTX_init(context);
29a23f9d	419	if (!EVP_SignInit(context, checksum_algo->calculate_sign())) {
19c402af SG	420	ret = rsa_err("Signer setup failed");
	421	goto err_sign;
	422	}
	423
	424	for (i = 0; i < region_count; i++) {
	425	if (!EVP_SignUpdate(context, region[i].data, region[i].size)) {
	426	ret = rsa_err("Signing data failed");
	427	goto err_sign;
	428	}
	429	}
	430
	431	if (!EVP_SignFinal(context, sig, sig_size, key)) {
	432	ret = rsa_err("Could not obtain signature");
	433	goto err_sign;
	434	}
c3b43281 JW	435	#if OPENSSL_VERSION_NUMBER < 0x10100000L
	436	EVP_MD_CTX_cleanup(context);
	437	#else
	438	EVP_MD_CTX_reset(context);
	439	#endif
19c402af SG	440	EVP_MD_CTX_destroy(context);
	441	EVP_PKEY_free(key);
	442
	443	debug("Got signature: %d bytes, expected %d\n", *sig_size, size);
	444	*sigp = sig;
	445	*sig_size = size;
	446
	447	return 0;
	448
	449	err_sign:
	450	EVP_MD_CTX_destroy(context);
	451	err_create:
	452	free(sig);
	453	err_alloc:
	454	err_set:
	455	EVP_PKEY_free(key);
	456	return ret;
	457	}
	458
	459	int rsa_sign(struct image_sign_info *info,
	460	const struct image_region region[], int region_count,
	461	uint8_t *sigp, uint sig_len)
	462	{
	463	RSA *rsa;
f1ca1fde	464	ENGINE *e = NULL;
19c402af SG	465	int ret;
	466
	467	ret = rsa_init();
	468	if (ret)
	469	return ret;
	470
f1ca1fde GM	471	if (info->engine_id) {
	472	ret = rsa_engine_init(info->engine_id, &e);
	473	if (ret)
	474	goto err_engine;
	475	}
	476
	477	ret = rsa_get_priv_key(info->keydir, info->keyname, e, &rsa);
19c402af SG	478	if (ret)
19c402af SG	479	goto err_priv;
83dd98e0	480	ret = rsa_sign_with_key(rsa, info->checksum, region,
646257d1	481	region_count, sigp, sig_len);
19c402af SG	482	if (ret)
	483	goto err_sign;
	484
	485	RSA_free(rsa);
f1ca1fde GM	486	if (info->engine_id)
f1ca1fde GM	487	rsa_engine_remove(e);
19c402af SG	488	rsa_remove();
	489
	490	return ret;
	491
	492	err_sign:
	493	RSA_free(rsa);
	494	err_priv:
f1ca1fde GM	495	if (info->engine_id)
	496	rsa_engine_remove(e);
	497	err_engine:
19c402af SG	498	rsa_remove();
	499	return ret;
	500	}
	501
e0f2f155 MW	502	/*
	503	* rsa_get_exponent(): - Get the public exponent from an RSA key
	504	*/
	505	static int rsa_get_exponent(RSA key, uint64_t e)
	506	{
	507	int ret;
	508	BIGNUM *bn_te;
c3b43281	509	const BIGNUM *key_e;
e0f2f155 MW	510	uint64_t te;
	511
	512	ret = -EINVAL;
	513	bn_te = NULL;
	514
	515	if (!e)
	516	goto cleanup;
	517
c3b43281 JW	518	RSA_get0_key(key, NULL, &key_e, NULL);
c3b43281 JW	519	if (BN_num_bits(key_e) > 64)
e0f2f155 MW	520	goto cleanup;
e0f2f155 MW	521
c3b43281	522	*e = BN_get_word(key_e);
e0f2f155	523
c3b43281	524	if (BN_num_bits(key_e) < 33) {
e0f2f155 MW	525	ret = 0;
	526	goto cleanup;
	527	}
	528
c3b43281	529	bn_te = BN_dup(key_e);
e0f2f155 MW	530	if (!bn_te)
	531	goto cleanup;
	532
	533	if (!BN_rshift(bn_te, bn_te, 32))
	534	goto cleanup;
	535
	536	if (!BN_mask_bits(bn_te, 32))
	537	goto cleanup;
	538
	539	te = BN_get_word(bn_te);
	540	te <<= 32;
	541	*e \|= te;
	542	ret = 0;
	543
	544	cleanup:
	545	if (bn_te)
	546	BN_free(bn_te);
	547
	548	return ret;
	549	}
	550
19c402af SG	551	/*
	552	* rsa_get_params(): - Get the important parameters of an RSA public key
	553	*/
e0f2f155 MW	554	int rsa_get_params(RSA key, uint64_t exponent, uint32_t *n0_invp,
e0f2f155 MW	555	BIGNUM modulusp, BIGNUM r_squaredp)
19c402af SG	556	{
	557	BIGNUM big1, big2, big32, big2_32;
	558	BIGNUM n, r, r_squared, tmp;
c3b43281	559	const BIGNUM *key_n;
19c402af SG	560	BN_CTX *bn_ctx = BN_CTX_new();
	561	int ret = 0;
	562
	563	/* Initialize BIGNUMs */
	564	big1 = BN_new();
	565	big2 = BN_new();
	566	big32 = BN_new();
	567	r = BN_new();
	568	r_squared = BN_new();
	569	tmp = BN_new();
	570	big2_32 = BN_new();
	571	n = BN_new();
	572	if (!big1 \|\| !big2 \|\| !big32 \|\| !r \|\| !r_squared \|\| !tmp \|\| !big2_32 \|\|
	573	!n) {
	574	fprintf(stderr, "Out of memory (bignum)\n");
	575	return -ENOMEM;
	576	}
	577
e0f2f155 MW	578	if (0 != rsa_get_exponent(key, exponent))
	579	ret = -1;
	580
c3b43281 JW	581	RSA_get0_key(key, &key_n, NULL, NULL);
c3b43281 JW	582	if (!BN_copy(n, key_n) \|\| !BN_set_word(big1, 1L) \|\|
19c402af SG	583	!BN_set_word(big2, 2L) \|\| !BN_set_word(big32, 32L))
	584	ret = -1;
	585
	586	/* big2_32 = 2^32 */
	587	if (!BN_exp(big2_32, big2, big32, bn_ctx))
	588	ret = -1;
	589
	590	/* Calculate n0_inv = -1 / n[0] mod 2^32 */
	591	if (!BN_mod_inverse(tmp, n, big2_32, bn_ctx) \|\|
	592	!BN_sub(tmp, big2_32, tmp))
	593	ret = -1;
	594	*n0_invp = BN_get_word(tmp);
	595
	596	/* Calculate R = 2^(# of key bits) */
	597	if (!BN_set_word(tmp, BN_num_bits(n)) \|\|
	598	!BN_exp(r, big2, tmp, bn_ctx))
	599	ret = -1;
	600
	601	/* Calculate r_squared = R^2 mod n */
	602	if (!BN_copy(r_squared, r) \|\|
	603	!BN_mul(tmp, r_squared, r, bn_ctx) \|\|
	604	!BN_mod(r_squared, tmp, n, bn_ctx))
	605	ret = -1;
	606
	607	*modulusp = n;
	608	*r_squaredp = r_squared;
	609
	610	BN_free(big1);
	611	BN_free(big2);
	612	BN_free(big32);
	613	BN_free(r);
	614	BN_free(tmp);
	615	BN_free(big2_32);
	616	if (ret) {
	617	fprintf(stderr, "Bignum operations failed\n");
	618	return -ENOMEM;
	619	}
	620
	621	return ret;
	622	}
	623
	624	static int fdt_add_bignum(void blob, int noffset, const char prop_name,
	625	BIGNUM *num, int num_bits)
	626	{
	627	int nwords = num_bits / 32;
	628	int size;
	629	uint32_t buf, ptr;
	630	BIGNUM tmp, big2, big32, big2_32;
	631	BN_CTX *ctx;
	632	int ret;
	633
	634	tmp = BN_new();
	635	big2 = BN_new();
	636	big32 = BN_new();
	637	big2_32 = BN_new();
	638	if (!tmp \|\| !big2 \|\| !big32 \|\| !big2_32) {
	639	fprintf(stderr, "Out of memory (bignum)\n");
	640	return -ENOMEM;
	641	}
	642	ctx = BN_CTX_new();
	643	if (!tmp) {
	644	fprintf(stderr, "Out of memory (bignum context)\n");
	645	return -ENOMEM;
	646	}
647	BN_set_word(big2, 2L);
648	BN_set_word(big32, 32L);
649	BN_exp(big2_32, big2, big32, ctx); /* B = 2^32 */
650
651	size = nwords * sizeof(uint32_t);
652	buf = malloc(size);
653	if (!buf) {
654	fprintf(stderr, "Out of memory (%d bytes)\n", size);
655	return -ENOMEM;
656	}
657
658	/* Write out modulus as big endian array of integers */
659	for (ptr = buf + nwords - 1; ptr >= buf; ptr--) {
660	BN_mod(tmp, num, big2_32, ctx); /* n = N mod B */
661	*ptr = cpu_to_fdt32(BN_get_word(tmp));
662	BN_rshift(num, num, 32); /* N = N/B */
663	}
664
713fb2dc	665	/*
	666	* We try signing with successively increasing size values, so this
	667	* might fail several times
	668	*/
19c402af	669	ret = fdt_setprop(blob, noffset, prop_name, buf, size);
2b9ec762	670	if (ret)
2b9ec762	671	return -FDT_ERR_NOSPACE;
19c402af SG	672	free(buf);
	673	BN_free(tmp);
	674	BN_free(big2);
	675	BN_free(big32);
	676	BN_free(big2_32);
	677
	678	return ret;
	679	}
	680
	681	int rsa_add_verify_data(struct image_sign_info info, void keydest)
	682	{
	683	BIGNUM modulus, r_squared;
e0f2f155	684	uint64_t exponent;
19c402af SG	685	uint32_t n0_inv;
	686	int parent, node;
	687	char name[100];
	688	int ret;
	689	int bits;
	690	RSA *rsa;
f1ca1fde	691	ENGINE *e = NULL;
19c402af SG	692
19c402af SG	693	debug("%s: Getting verification data\n", __func__);
f1ca1fde GM	694	if (info->engine_id) {
	695	ret = rsa_engine_init(info->engine_id, &e);
	696	if (ret)
	697	return ret;
	698	}
	699	ret = rsa_get_pub_key(info->keydir, info->keyname, e, &rsa);
19c402af	700	if (ret)
f1ca1fde	701	goto err_get_pub_key;
e0f2f155	702	ret = rsa_get_params(rsa, &exponent, &n0_inv, &modulus, &r_squared);
19c402af	703	if (ret)
f1ca1fde	704	goto err_get_params;
19c402af SG	705	bits = BN_num_bits(modulus);
	706	parent = fdt_subnode_offset(keydest, 0, FIT_SIG_NODENAME);
	707	if (parent == -FDT_ERR_NOTFOUND) {
	708	parent = fdt_add_subnode(keydest, 0, FIT_SIG_NODENAME);
	709	if (parent < 0) {
597a8b2c SG	710	ret = parent;
	711	if (ret != -FDT_ERR_NOSPACE) {
	712	fprintf(stderr, "Couldn't create signature node: %s\n",
	713	fdt_strerror(parent));
	714	}
19c402af SG	715	}
19c402af SG	716	}
597a8b2c SG	717	if (ret)
597a8b2c SG	718	goto done;
19c402af SG	719
	720	/* Either create or overwrite the named key node */
	721	snprintf(name, sizeof(name), "key-%s", info->keyname);
	722	node = fdt_subnode_offset(keydest, parent, name);
	723	if (node == -FDT_ERR_NOTFOUND) {
	724	node = fdt_add_subnode(keydest, parent, name);
	725	if (node < 0) {
597a8b2c SG	726	ret = node;
	727	if (ret != -FDT_ERR_NOSPACE) {
	728	fprintf(stderr, "Could not create key subnode: %s\n",
	729	fdt_strerror(node));
	730	}
19c402af SG	731	}
	732	} else if (node < 0) {
	733	fprintf(stderr, "Cannot select keys parent: %s\n",
	734	fdt_strerror(node));
597a8b2c	735	ret = node;
19c402af SG	736	}
19c402af SG	737
597a8b2c SG	738	if (!ret) {
597a8b2c SG	739	ret = fdt_setprop_string(keydest, node, "key-name-hint",
19c402af	740	info->keyname);
597a8b2c	741	}
4f427a42 SG	742	if (!ret)
	743	ret = fdt_setprop_u32(keydest, node, "rsa,num-bits", bits);
	744	if (!ret)
	745	ret = fdt_setprop_u32(keydest, node, "rsa,n0-inverse", n0_inv);
e0f2f155 MW	746	if (!ret) {
	747	ret = fdt_setprop_u64(keydest, node, "rsa,exponent", exponent);
	748	}
4f427a42 SG	749	if (!ret) {
	750	ret = fdt_add_bignum(keydest, node, "rsa,modulus", modulus,
	751	bits);
	752	}
	753	if (!ret) {
	754	ret = fdt_add_bignum(keydest, node, "rsa,r-squared", r_squared,
	755	bits);
	756	}
	757	if (!ret) {
	758	ret = fdt_setprop_string(keydest, node, FIT_ALGO_PROP,
83dd98e0	759	info->name);
4f427a42	760	}
2b9ec762	761	if (!ret && info->require_keys) {
4f427a42 SG	762	ret = fdt_setprop_string(keydest, node, "required",
4f427a42 SG	763	info->require_keys);
19c402af	764	}
597a8b2c	765	done:
19c402af SG	766	BN_free(modulus);
	767	BN_free(r_squared);
	768	if (ret)
f1ca1fde GM	769	ret = ret == -FDT_ERR_NOSPACE ? -ENOSPC : -EIO;
	770	err_get_params:
	771	RSA_free(rsa);
	772	err_get_pub_key:
	773	if (info->engine_id)
	774	rsa_engine_remove(e);
19c402af	775
f1ca1fde	776	return ret;
19c402af	777	}