diff options
Diffstat (limited to 'crypto/rsa_helper.c')
| -rw-r--r-- | crypto/rsa_helper.c | 111 |
1 files changed, 39 insertions, 72 deletions
diff --git a/crypto/rsa_helper.c b/crypto/rsa_helper.c index d226f48d0907..583656af4fe2 100644 --- a/crypto/rsa_helper.c +++ b/crypto/rsa_helper.c @@ -22,20 +22,29 @@ int rsa_get_n(void *context, size_t hdrlen, unsigned char tag, const void *value, size_t vlen) { struct rsa_key *key = context; + const u8 *ptr = value; + size_t n_sz = vlen; - key->n = mpi_read_raw_data(value, vlen); - - if (!key->n) - return -ENOMEM; - - /* In FIPS mode only allow key size 2K & 3K */ - if (fips_enabled && (mpi_get_size(key->n) != 256 && - mpi_get_size(key->n) != 384)) { - pr_err("RSA: key size not allowed in FIPS mode\n"); - mpi_free(key->n); - key->n = NULL; + /* invalid key provided */ + if (!value || !vlen) return -EINVAL; + + if (fips_enabled) { + while (!*ptr && n_sz) { + ptr++; + n_sz--; + } + + /* In FIPS mode only allow key size 2K & 3K */ + if (n_sz != 256 && n_sz != 384) { + pr_err("RSA: key size not allowed in FIPS mode\n"); + return -EINVAL; + } } + + key->n = value; + key->n_sz = vlen; + return 0; } @@ -44,10 +53,12 @@ int rsa_get_e(void *context, size_t hdrlen, unsigned char tag, { struct rsa_key *key = context; - key->e = mpi_read_raw_data(value, vlen); + /* invalid key provided */ + if (!value || !key->n_sz || !vlen || vlen > key->n_sz) + return -EINVAL; - if (!key->e) - return -ENOMEM; + key->e = value; + key->e_sz = vlen; return 0; } @@ -57,46 +68,20 @@ int rsa_get_d(void *context, size_t hdrlen, unsigned char tag, { struct rsa_key *key = context; - key->d = mpi_read_raw_data(value, vlen); - - if (!key->d) - return -ENOMEM; - - /* In FIPS mode only allow key size 2K & 3K */ - if (fips_enabled && (mpi_get_size(key->d) != 256 && - mpi_get_size(key->d) != 384)) { - pr_err("RSA: key size not allowed in FIPS mode\n"); - mpi_free(key->d); - key->d = NULL; + /* invalid key provided */ + if (!value || !key->n_sz || !vlen || vlen > key->n_sz) return -EINVAL; - } - return 0; -} -static void free_mpis(struct rsa_key *key) -{ - mpi_free(key->n); - mpi_free(key->e); - mpi_free(key->d); - key->n = NULL; - key->e = NULL; - key->d = NULL; -} + key->d = value; + key->d_sz = vlen; -/** - * rsa_free_key() - frees rsa key allocated by rsa_parse_key() - * - * @rsa_key: struct rsa_key key representation - */ -void rsa_free_key(struct rsa_key *key) -{ - free_mpis(key); + return 0; } -EXPORT_SYMBOL_GPL(rsa_free_key); /** - * rsa_parse_pub_key() - extracts an rsa public key from BER encoded buffer - * and stores it in the provided struct rsa_key + * rsa_parse_pub_key() - decodes the BER encoded buffer and stores in the + * provided struct rsa_key, pointers to the raw key as is, + * so that the caller can copy it or MPI parse it, etc. * * @rsa_key: struct rsa_key key representation * @key: key in BER format @@ -107,23 +92,15 @@ EXPORT_SYMBOL_GPL(rsa_free_key); int rsa_parse_pub_key(struct rsa_key *rsa_key, const void *key, unsigned int key_len) { - int ret; - - free_mpis(rsa_key); - ret = asn1_ber_decoder(&rsapubkey_decoder, rsa_key, key, key_len); - if (ret < 0) - goto error; - - return 0; -error: - free_mpis(rsa_key); - return ret; + return asn1_ber_decoder(&rsapubkey_decoder, rsa_key, key, key_len); } EXPORT_SYMBOL_GPL(rsa_parse_pub_key); /** - * rsa_parse_pub_key() - extracts an rsa private key from BER encoded buffer - * and stores it in the provided struct rsa_key + * rsa_parse_priv_key() - decodes the BER encoded buffer and stores in the + * provided struct rsa_key, pointers to the raw key + * as is, so that the caller can copy it or MPI parse it, + * etc. * * @rsa_key: struct rsa_key key representation * @key: key in BER format @@ -134,16 +111,6 @@ EXPORT_SYMBOL_GPL(rsa_parse_pub_key); int rsa_parse_priv_key(struct rsa_key *rsa_key, const void *key, unsigned int key_len) { - int ret; - - free_mpis(rsa_key); - ret = asn1_ber_decoder(&rsaprivkey_decoder, rsa_key, key, key_len); - if (ret < 0) - goto error; - - return 0; -error: - free_mpis(rsa_key); - return ret; + return asn1_ber_decoder(&rsaprivkey_decoder, rsa_key, key, key_len); } EXPORT_SYMBOL_GPL(rsa_parse_priv_key); |