From 215525639631ade1d67e879fe2c3d7195daa9f59 Mon Sep 17 00:00:00 2001 From: Tianjia Zhang Date: Mon, 21 Sep 2020 00:21:02 +0800 Subject: X.509: support OSCCA SM2-with-SM3 certificate verification The digital certificate format based on SM2 crypto algorithm as specified in GM/T 0015-2012. It was published by State Encryption Management Bureau, China. The method of generating Other User Information is defined as ZA=H256(ENTLA || IDA || a || b || xG || yG || xA || yA), it also specified in https://tools.ietf.org/html/draft-shen-sm2-ecdsa-02. The x509 certificate supports SM2-with-SM3 type certificate verification. Because certificate verification requires ZA in addition to tbs data, ZA also depends on elliptic curve parameters and public key data, so you need to access tbs in sig and calculate ZA. Finally calculate the digest of the signature and complete the verification work. The calculation process of ZA is declared in specifications GM/T 0009-2012 and GM/T 0003.2-2012. Signed-off-by: Tianjia Zhang Tested-by: Xufeng Zhang Reviewed-by: Gilad Ben-Yossef Signed-off-by: Herbert Xu --- include/crypto/public_key.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'include/crypto') diff --git a/include/crypto/public_key.h b/include/crypto/public_key.h index 11f535cfb810..02a6dbe5c366 100644 --- a/include/crypto/public_key.h +++ b/include/crypto/public_key.h @@ -12,6 +12,7 @@ #include #include +#include /* * Cryptographic data for the public-key subtype of the asymmetric key type. @@ -44,6 +45,8 @@ struct public_key_signature { const char *pkey_algo; const char *hash_algo; const char *encoding; + const void *data; + unsigned int data_size; }; extern void public_key_signature_free(struct public_key_signature *sig); @@ -81,4 +84,16 @@ extern int verify_signature(const struct key *, int public_key_verify_signature(const struct public_key *pkey, const struct public_key_signature *sig); +#if IS_REACHABLE(CONFIG_CRYPTO_SM2) +int cert_sig_digest_update(const struct public_key_signature *sig, + struct crypto_akcipher *tfm_pkey); +#else +static inline +int cert_sig_digest_update(const struct public_key_signature *sig, + struct crypto_akcipher *tfm_pkey) +{ + return -ENOTSUPP; +} +#endif + #endif /* _LINUX_PUBLIC_KEY_H */ -- cgit v1.2.3-58-ga151