* SPDX-License-Identifier: GPL-2.0+
*/
+#ifndef USE_HOSTCC
#include <common.h>
#include <fdtdec.h>
-#include <rsa.h>
-#include <sha1.h>
+#include <asm/types.h>
#include <asm/byteorder.h>
#include <asm/errno.h>
+#include <asm/types.h>
#include <asm/unaligned.h>
+#include <dm.h>
+#else
+#include "fdt_host.h"
+#include "mkimage.h"
+#include <fdt_support.h>
+#endif
+#include <u-boot/rsa-mod-exp.h>
+#include <u-boot/rsa.h>
+
+/* Default public exponent for backward compatibility */
+#define RSA_DEFAULT_PUBEXP 65537
/**
- * struct rsa_public_key - holder for a public key
+ * rsa_verify_key() - Verify a signature against some data using RSA Key
*
- * An RSA public key consists of a modulus (typically called N), the inverse
- * and R^2, where R is 2^(# key bits).
- */
-struct rsa_public_key {
- uint len; /* Length of modulus[] in number of uint32_t */
- uint32_t n0inv; /* -1 / modulus[0] mod 2^32 */
- uint32_t *modulus; /* modulus as little endian array */
- uint32_t *rr; /* R^2 as little endian array */
-};
-
-#define UINT64_MULT32(v, multby) (((uint64_t)(v)) * ((uint32_t)(multby)))
-
-#define RSA2048_BYTES (2048 / 8)
-
-/* This is the minimum/maximum key size we support, in bits */
-#define RSA_MIN_KEY_BITS 2048
-#define RSA_MAX_KEY_BITS 2048
-
-/* This is the maximum signature length that we support, in bits */
-#define RSA_MAX_SIG_BITS 2048
-
-static const uint8_t padding_sha1_rsa2048[RSA2048_BYTES - SHA1_SUM_LEN] = {
- 0x00, 0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0x00, 0x30, 0x21, 0x30,
- 0x09, 0x06, 0x05, 0x2b, 0x0e, 0x03, 0x02, 0x1a,
- 0x05, 0x00, 0x04, 0x14
-};
-
-/**
- * subtract_modulus() - subtract modulus from the given value
- *
- * @key: Key containing modulus to subtract
- * @num: Number to subtract modulus from, as little endian word array
- */
-static void subtract_modulus(const struct rsa_public_key *key, uint32_t num[])
-{
- int64_t acc = 0;
- uint i;
-
- for (i = 0; i < key->len; i++) {
- acc += (uint64_t)num[i] - key->modulus[i];
- num[i] = (uint32_t)acc;
- acc >>= 32;
- }
-}
-
-/**
- * greater_equal_modulus() - check if a value is >= modulus
- *
- * @key: Key containing modulus to check
- * @num: Number to check against modulus, as little endian word array
- * @return 0 if num < modulus, 1 if num >= modulus
- */
-static int greater_equal_modulus(const struct rsa_public_key *key,
- uint32_t num[])
-{
- uint32_t i;
-
- for (i = key->len - 1; i >= 0; i--) {
- if (num[i] < key->modulus[i])
- return 0;
- if (num[i] > key->modulus[i])
- return 1;
- }
-
- return 1; /* equal */
-}
-
-/**
- * montgomery_mul_add_step() - Perform montgomery multiply-add step
- *
- * Operation: montgomery result[] += a * b[] / n0inv % modulus
+ * Verify a RSA PKCS1.5 signature against an expected hash using
+ * the RSA Key properties in prop structure.
*
- * @key: RSA key
- * @result: Place to put result, as little endian word array
- * @a: Multiplier
- * @b: Multiplicand, as little endian word array
+ * @prop: Specifies key
+ * @sig: Signature
+ * @sig_len: Number of bytes in signature
+ * @hash: Pointer to the expected hash
+ * @algo: Checksum algo structure having information on RSA padding etc.
+ * @return 0 if verified, -ve on error
*/
-static void montgomery_mul_add_step(const struct rsa_public_key *key,
- uint32_t result[], const uint32_t a, const uint32_t b[])
-{
- uint64_t acc_a, acc_b;
- uint32_t d0;
- uint i;
-
- acc_a = (uint64_t)a * b[0] + result[0];
- d0 = (uint32_t)acc_a * key->n0inv;
- acc_b = (uint64_t)d0 * key->modulus[0] + (uint32_t)acc_a;
- for (i = 1; i < key->len; i++) {
- acc_a = (acc_a >> 32) + (uint64_t)a * b[i] + result[i];
- acc_b = (acc_b >> 32) + (uint64_t)d0 * key->modulus[i] +
- (uint32_t)acc_a;
- result[i - 1] = (uint32_t)acc_b;
- }
-
- acc_a = (acc_a >> 32) + (acc_b >> 32);
-
- result[i - 1] = (uint32_t)acc_a;
-
- if (acc_a >> 32)
- subtract_modulus(key, result);
-}
-
-/**
- * montgomery_mul() - Perform montgomery mutitply
- *
- * Operation: montgomery result[] = a[] * b[] / n0inv % modulus
- *
- * @key: RSA key
- * @result: Place to put result, as little endian word array
- * @a: Multiplier, as little endian word array
- * @b: Multiplicand, as little endian word array
- */
-static void montgomery_mul(const struct rsa_public_key *key,
- uint32_t result[], uint32_t a[], const uint32_t b[])
-{
- uint i;
-
- for (i = 0; i < key->len; ++i)
- result[i] = 0;
- for (i = 0; i < key->len; ++i)
- montgomery_mul_add_step(key, result, a[i], b);
-}
-
-/**
- * pow_mod() - in-place public exponentiation
- *
- * @key: RSA key
- * @inout: Big-endian word array containing value and result
- */
-static int pow_mod(const struct rsa_public_key *key, uint32_t *inout)
-{
- uint32_t *result, *ptr;
- uint i;
-
- /* Sanity check for stack size - key->len is in 32-bit words */
- if (key->len > RSA_MAX_KEY_BITS / 32) {
- debug("RSA key words %u exceeds maximum %d\n", key->len,
- RSA_MAX_KEY_BITS / 32);
- return -EINVAL;
- }
-
- uint32_t val[key->len], acc[key->len], tmp[key->len];
- result = tmp; /* Re-use location. */
-
- /* Convert from big endian byte array to little endian word array. */
- for (i = 0, ptr = inout + key->len - 1; i < key->len; i++, ptr--)
- val[i] = get_unaligned_be32(ptr);
-
- montgomery_mul(key, acc, val, key->rr); /* axx = a * RR / R mod M */
- for (i = 0; i < 16; i += 2) {
- montgomery_mul(key, tmp, acc, acc); /* tmp = acc^2 / R mod M */
- montgomery_mul(key, acc, tmp, tmp); /* acc = tmp^2 / R mod M */
- }
- montgomery_mul(key, result, acc, val); /* result = XX * a / R mod M */
-
- /* Make sure result < mod; result is at most 1x mod too large. */
- if (greater_equal_modulus(key, result))
- subtract_modulus(key, result);
-
- /* Convert to bigendian byte array */
- for (i = key->len - 1, ptr = inout; (int)i >= 0; i--, ptr++)
- put_unaligned_be32(result[i], ptr);
-
- return 0;
-}
-
-static int rsa_verify_key(const struct rsa_public_key *key, const uint8_t *sig,
- const uint32_t sig_len, const uint8_t *hash)
+static int rsa_verify_key(struct key_prop *prop, const uint8_t *sig,
+ const uint32_t sig_len, const uint8_t *hash,
+ struct checksum_algo *algo)
{
const uint8_t *padding;
int pad_len;
int ret;
+#if !defined(USE_HOSTCC)
+ struct udevice *mod_exp_dev;
+#endif
- if (!key || !sig || !hash)
+ if (!prop || !sig || !hash || !algo)
return -EIO;
- if (sig_len != (key->len * sizeof(uint32_t))) {
+ if (sig_len != (prop->num_bits / 8)) {
debug("Signature is of incorrect length %d\n", sig_len);
return -EINVAL;
}
+ debug("Checksum algorithm: %s", algo->name);
+
/* Sanity check for stack size */
if (sig_len > RSA_MAX_SIG_BITS / 8) {
debug("Signature length %u exceeds maximum %d\n", sig_len,
return -EINVAL;
}
- uint32_t buf[sig_len / sizeof(uint32_t)];
+ uint8_t buf[sig_len];
- memcpy(buf, sig, sig_len);
+#if !defined(USE_HOSTCC)
+ ret = uclass_get_device(UCLASS_MOD_EXP, 0, &mod_exp_dev);
+ if (ret) {
+ printf("RSA: Can't find Modular Exp implementation\n");
+ return -EINVAL;
+ }
- ret = pow_mod(key, buf);
- if (ret)
+ ret = rsa_mod_exp(mod_exp_dev, sig, sig_len, prop, buf);
+#else
+ ret = rsa_mod_exp_sw(sig, sig_len, prop, buf);
+#endif
+ if (ret) {
+ debug("Error in Modular exponentation\n");
return ret;
+ }
- /* Determine padding to use depending on the signature type. */
- padding = padding_sha1_rsa2048;
- pad_len = RSA2048_BYTES - SHA1_SUM_LEN;
+ padding = algo->rsa_padding;
+ pad_len = algo->pad_len - algo->checksum_len;
/* Check pkcs1.5 padding bytes. */
if (memcmp(buf, padding, pad_len)) {
return 0;
}
-static void rsa_convert_big_endian(uint32_t *dst, const uint32_t *src, int len)
-{
- int i;
-
- for (i = 0; i < len; i++)
- dst[i] = fdt32_to_cpu(src[len - 1 - i]);
-}
-
+/**
+ * rsa_verify_with_keynode() - Verify a signature against some data using
+ * information in node with prperties of RSA Key like modulus, exponent etc.
+ *
+ * Parse sign-node and fill a key_prop structure with properties of the
+ * key. Verify a RSA PKCS1.5 signature against an expected hash using
+ * the properties parsed
+ *
+ * @info: Specifies key and FIT information
+ * @hash: Pointer to the expected hash
+ * @sig: Signature
+ * @sig_len: Number of bytes in signature
+ * @node: Node having the RSA Key properties
+ * @return 0 if verified, -ve on error
+ */
static int rsa_verify_with_keynode(struct image_sign_info *info,
- const void *hash, uint8_t *sig, uint sig_len, int node)
+ const void *hash, uint8_t *sig,
+ uint sig_len, int node)
{
const void *blob = info->fdt_blob;
- struct rsa_public_key key;
- const void *modulus, *rr;
- int ret;
+ struct key_prop prop;
+ int length;
+ int ret = 0;
if (node < 0) {
debug("%s: Skipping invalid node", __func__);
return -EBADF;
}
- if (!fdt_getprop(blob, node, "rsa,n0-inverse", NULL)) {
- debug("%s: Missing rsa,n0-inverse", __func__);
- return -EFAULT;
- }
- key.len = fdtdec_get_int(blob, node, "rsa,num-bits", 0);
- key.n0inv = fdtdec_get_int(blob, node, "rsa,n0-inverse", 0);
- modulus = fdt_getprop(blob, node, "rsa,modulus", NULL);
- rr = fdt_getprop(blob, node, "rsa,r-squared", NULL);
- if (!key.len || !modulus || !rr) {
+
+ prop.num_bits = fdtdec_get_int(blob, node, "rsa,num-bits", 0);
+
+ prop.n0inv = fdtdec_get_int(blob, node, "rsa,n0-inverse", 0);
+
+ prop.public_exponent = fdt_getprop(blob, node, "rsa,exponent", &length);
+ if (!prop.public_exponent || length < sizeof(uint64_t))
+ prop.public_exponent = NULL;
+
+ prop.exp_len = sizeof(uint64_t);
+
+ prop.modulus = fdt_getprop(blob, node, "rsa,modulus", NULL);
+
+ prop.rr = fdt_getprop(blob, node, "rsa,r-squared", NULL);
+
+ if (!prop.num_bits || !prop.modulus) {
debug("%s: Missing RSA key info", __func__);
return -EFAULT;
}
- /* Sanity check for stack size */
- if (key.len > RSA_MAX_KEY_BITS || key.len < RSA_MIN_KEY_BITS) {
- debug("RSA key bits %u outside allowed range %d..%d\n",
- key.len, RSA_MIN_KEY_BITS, RSA_MAX_KEY_BITS);
- return -EFAULT;
- }
- key.len /= sizeof(uint32_t) * 8;
- uint32_t key1[key.len], key2[key.len];
-
- key.modulus = key1;
- key.rr = key2;
- rsa_convert_big_endian(key.modulus, modulus, key.len);
- rsa_convert_big_endian(key.rr, rr, key.len);
- if (!key.modulus || !key.rr) {
- debug("%s: Out of memory", __func__);
- return -ENOMEM;
- }
+ ret = rsa_verify_key(&prop, sig, sig_len, hash, info->algo->checksum);
- debug("key length %d\n", key.len);
- ret = rsa_verify_key(&key, sig, sig_len, hash);
- if (ret) {
- printf("%s: RSA failed to verify: %d\n", __func__, ret);
- return ret;
- }
-
- return 0;
+ return ret;
}
int rsa_verify(struct image_sign_info *info,
uint8_t *sig, uint sig_len)
{
const void *blob = info->fdt_blob;
- uint8_t hash[SHA1_SUM_LEN];
+ /* Reserve memory for maximum checksum-length */
+ uint8_t hash[info->algo->checksum->pad_len];
int ndepth, noffset;
int sig_node, node;
char name[100];
- sha1_context ctx;
- int ret, i;
+ int ret;
+
+ /*
+ * Verify that the checksum-length does not exceed the
+ * rsa-signature-length
+ */
+ if (info->algo->checksum->checksum_len >
+ info->algo->checksum->pad_len) {
+ debug("%s: invlaid checksum-algorithm %s for %s\n",
+ __func__, info->algo->checksum->name, info->algo->name);
+ return -EINVAL;
+ }
sig_node = fdt_subnode_offset(blob, 0, FIT_SIG_NODENAME);
if (sig_node < 0) {
return -ENOENT;
}
- sha1_starts(&ctx);
- for (i = 0; i < region_count; i++)
- sha1_update(&ctx, region[i].data, region[i].size);
- sha1_finish(&ctx, hash);
+ /* Calculate checksum with checksum-algorithm */
+ ret = info->algo->checksum->calculate(info->algo->checksum->name,
+ region, region_count, hash);
+ if (ret < 0) {
+ debug("%s: Error in checksum calculation\n", __func__);
+ return -EINVAL;
+ }
/* See if we must use a particular key */
if (info->required_keynode != -1) {
projects / karo-tx-uboot.git / blobdiff