hulk inclusion category: feature feature: digest-lists
---------------------------
Parse the RSA key with RAW format if the ASN.1 parser returns an error.
Signed-off-by: Roberto Sassu roberto.sassu@huawei.com --- crypto/rsa.c | 14 +++++-- crypto/rsa_helper.c | 69 +++++++++++++++++++++++++++++++++++ include/crypto/internal/rsa.h | 6 +++ 3 files changed, 85 insertions(+), 4 deletions(-)
diff --git a/crypto/rsa.c b/crypto/rsa.c index 4167980c243d..d33aa039de6e 100644 --- a/crypto/rsa.c +++ b/crypto/rsa.c @@ -275,8 +275,11 @@ static int rsa_set_pub_key(struct crypto_akcipher *tfm, const void *key, rsa_free_mpi_key(mpi_key);
ret = rsa_parse_pub_key(&raw_key, key, keylen); - if (ret) - return ret; + if (ret) { + ret = rsa_parse_pub_key_raw(&raw_key, key, keylen); + if (ret) + return ret; + }
mpi_key->e = mpi_read_raw_data(raw_key.e, raw_key.e_sz); if (!mpi_key->e) @@ -309,8 +312,11 @@ static int rsa_set_priv_key(struct crypto_akcipher *tfm, const void *key, rsa_free_mpi_key(mpi_key);
ret = rsa_parse_priv_key(&raw_key, key, keylen); - if (ret) - return ret; + if (ret) { + ret = rsa_parse_priv_key_raw(&raw_key, key, keylen); + if (ret) + return ret; + }
mpi_key->d = mpi_read_raw_data(raw_key.d, raw_key.d_sz); if (!mpi_key->d) diff --git a/crypto/rsa_helper.c b/crypto/rsa_helper.c index efc78fe7ae2e..fda85fbe2e38 100644 --- a/crypto/rsa_helper.c +++ b/crypto/rsa_helper.c @@ -14,6 +14,7 @@ #include <linux/export.h> #include <linux/err.h> #include <linux/fips.h> +#include <linux/mpi.h> #include <crypto/internal/rsa.h> #include "rsapubkey.asn1.h" #include "rsaprivkey.asn1.h" @@ -153,6 +154,32 @@ int rsa_get_qinv(void *context, size_t hdrlen, unsigned char tag, return 0; }
+typedef int (*rsa_get_func)(void *, size_t, unsigned char, + const void *, size_t); + +static int rsa_parse_key_raw(struct rsa_key *rsa_key, + const void *key, unsigned int key_len, + rsa_get_func *func, int n_func) +{ + unsigned int nbytes, len = key_len; + const void *key_ptr = key; + int ret, i; + + for (i = 0; i < n_func; i++) { + ret = mpi_key_length(key_ptr, len, NULL, &nbytes); + if (ret < 0) + return ret; + + ret = func[i](rsa_key, 0, 0, key_ptr + 2, nbytes); + if (ret < 0) + return ret; + + key_ptr += nbytes + 2; + } + + return (key_ptr == key + key_len) ? 0 : -EINVAL; +} + /** * rsa_parse_pub_key() - decodes the BER encoded buffer and stores in the * provided struct rsa_key, pointers to the raw key as is, @@ -171,6 +198,27 @@ int rsa_parse_pub_key(struct rsa_key *rsa_key, const void *key, } EXPORT_SYMBOL_GPL(rsa_parse_pub_key);
+/** + * rsa_parse_pub_key_raw() - parse the RAW key and store 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 RAW format + * @key_len: length of key + * + * Return: 0 on success or error code in case of error + */ +int rsa_parse_pub_key_raw(struct rsa_key *rsa_key, const void *key, + unsigned int key_len) +{ + rsa_get_func pub_func[] = {rsa_get_n, rsa_get_e}; + + return rsa_parse_key_raw(rsa_key, key, key_len, + pub_func, ARRAY_SIZE(pub_func)); +} +EXPORT_SYMBOL_GPL(rsa_parse_pub_key_raw); + /** * rsa_parse_priv_key() - decodes the BER encoded buffer and stores in the * provided struct rsa_key, pointers to the raw key @@ -189,3 +237,24 @@ int rsa_parse_priv_key(struct rsa_key *rsa_key, const void *key, return asn1_ber_decoder(&rsaprivkey_decoder, rsa_key, key, key_len); } EXPORT_SYMBOL_GPL(rsa_parse_priv_key); + +/** + * rsa_parse_priv_key_raw() - parse the RAW key and store 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 RAW format + * @key_len: length of key + * + * Return: 0 on success or error code in case of error + */ +int rsa_parse_priv_key_raw(struct rsa_key *rsa_key, const void *key, + unsigned int key_len) +{ + rsa_get_func priv_func[] = {rsa_get_n, rsa_get_e, rsa_get_d}; + + return rsa_parse_key_raw(rsa_key, key, key_len, + priv_func, ARRAY_SIZE(priv_func)); +} +EXPORT_SYMBOL_GPL(rsa_parse_priv_key_raw); diff --git a/include/crypto/internal/rsa.h b/include/crypto/internal/rsa.h index 9e8f1590de98..6bc672daa175 100644 --- a/include/crypto/internal/rsa.h +++ b/include/crypto/internal/rsa.h @@ -55,8 +55,14 @@ struct rsa_key { int rsa_parse_pub_key(struct rsa_key *rsa_key, const void *key, unsigned int key_len);
+int rsa_parse_pub_key_raw(struct rsa_key *rsa_key, const void *key, + unsigned int key_len); + int rsa_parse_priv_key(struct rsa_key *rsa_key, const void *key, unsigned int key_len);
+int rsa_parse_priv_key_raw(struct rsa_key *rsa_key, const void *key, + unsigned int key_len); + extern struct crypto_template rsa_pkcs1pad_tmpl; #endif