diff options
Diffstat (limited to 'lib/rsa/rsa-verify.c')
| -rw-r--r-- | lib/rsa/rsa-verify.c | 83 |
1 files changed, 24 insertions, 59 deletions
diff --git a/lib/rsa/rsa-verify.c b/lib/rsa/rsa-verify.c index 02cc4e3..b3573a8 100644 --- a/lib/rsa/rsa-verify.c +++ b/lib/rsa/rsa-verify.c @@ -8,23 +8,11 @@ #include <fdtdec.h> #include <rsa.h> #include <sha1.h> +#include <sha256.h> #include <asm/byteorder.h> #include <asm/errno.h> #include <asm/unaligned.h> -/** - * struct rsa_public_key - holder for a public 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) @@ -36,39 +24,6 @@ struct rsa_public_key { /* 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 * @@ -209,13 +164,14 @@ static int pow_mod(const struct rsa_public_key *key, uint32_t *inout) } static int rsa_verify_key(const struct rsa_public_key *key, const uint8_t *sig, - const uint32_t sig_len, const uint8_t *hash) + const uint32_t sig_len, const uint8_t *hash, + struct checksum_algo *algo) { const uint8_t *padding; int pad_len; int ret; - if (!key || !sig || !hash) + if (!key || !sig || !hash || !algo) return -EIO; if (sig_len != (key->len * sizeof(uint32_t))) { @@ -223,6 +179,8 @@ static int rsa_verify_key(const struct rsa_public_key *key, const uint8_t *sig, 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, @@ -238,9 +196,8 @@ static int rsa_verify_key(const struct rsa_public_key *key, const uint8_t *sig, if (ret) 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 = RSA2048_BYTES - algo->checksum_len; /* Check pkcs1.5 padding bytes. */ if (memcmp(buf, padding, pad_len)) { @@ -309,7 +266,7 @@ static int rsa_verify_with_keynode(struct image_sign_info *info, } debug("key length %d\n", key.len); - ret = rsa_verify_key(&key, sig, sig_len, hash); + ret = rsa_verify_key(&key, sig, sig_len, hash, info->algo->checksum); if (ret) { printf("%s: RSA failed to verify: %d\n", __func__, ret); return ret; @@ -323,12 +280,22 @@ 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[RSA2048_BYTES]; 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 > RSA2048_BYTES) { + debug("%s: invlaid checksum-algorithm %s for RSA2048\n", + __func__, info->algo->checksum->name); + return -EINVAL; + } sig_node = fdt_subnode_offset(blob, 0, FIT_SIG_NODENAME); if (sig_node < 0) { @@ -336,10 +303,8 @@ int rsa_verify(struct image_sign_info *info, 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 */ + info->algo->checksum->calculate(region, region_count, hash); /* See if we must use a particular key */ if (info->required_keynode != -1) { |