diff options
| -rw-r--r-- | arch/s390/include/asm/pkey.h | 8 | ||||
| -rw-r--r-- | arch/s390/include/uapi/asm/pkey.h | 10 | ||||
| -rw-r--r-- | drivers/s390/crypto/pkey_api.c | 55 |
3 files changed, 73 insertions, 0 deletions
diff --git a/arch/s390/include/asm/pkey.h b/arch/s390/include/asm/pkey.h index 053117ba7328..c931818b9921 100644 --- a/arch/s390/include/asm/pkey.h +++ b/arch/s390/include/asm/pkey.h @@ -109,4 +109,12 @@ int pkey_verifykey(const struct pkey_seckey *seckey, u16 *pcardnr, u16 *pdomain, u16 *pkeysize, u32 *pattributes); +/* + * In-kernel API: Generate (AES) random protected key. + * @param keytype one of the PKEY_KEYTYPE values + * @param protkey pointer to buffer receiving the protected key + * @return 0 on success, negative errno value on failure + */ +int pkey_genprotkey(__u32 keytype, struct pkey_protkey *protkey); + #endif /* _KAPI_PKEY_H */ diff --git a/arch/s390/include/uapi/asm/pkey.h b/arch/s390/include/uapi/asm/pkey.h index 6f84a53c3270..10a7bc7c5fa9 100644 --- a/arch/s390/include/uapi/asm/pkey.h +++ b/arch/s390/include/uapi/asm/pkey.h @@ -129,4 +129,14 @@ struct pkey_verifykey { #define PKEY_VERIFY_ATTR_AES 0x00000001 /* key is an AES key */ #define PKEY_VERIFY_ATTR_OLD_MKVP 0x00000100 /* key has old MKVP value */ +/* + * Generate (AES) random protected key. + */ +struct pkey_genprotk { + __u32 keytype; /* in: key type to generate */ + struct pkey_protkey protkey; /* out: the protected key */ +}; + +#define PKEY_GENPROTK _IOWR(PKEY_IOCTL_MAGIC, 0x08, struct pkey_genprotk) + #endif /* _UAPI_PKEY_H */ diff --git a/drivers/s390/crypto/pkey_api.c b/drivers/s390/crypto/pkey_api.c index 1b4001e0285f..29028ccdce5b 100644 --- a/drivers/s390/crypto/pkey_api.c +++ b/drivers/s390/crypto/pkey_api.c @@ -16,6 +16,7 @@ #include <linux/slab.h> #include <linux/kallsyms.h> #include <linux/debugfs.h> +#include <linux/random.h> #include <asm/zcrypt.h> #include <asm/cpacf.h> #include <asm/pkey.h> @@ -1052,6 +1053,46 @@ out: EXPORT_SYMBOL(pkey_verifykey); /* + * Generate a random protected key + */ +int pkey_genprotkey(__u32 keytype, struct pkey_protkey *protkey) +{ + struct pkey_clrkey clrkey; + int keysize; + int rc; + + switch (keytype) { + case PKEY_KEYTYPE_AES_128: + keysize = 16; + break; + case PKEY_KEYTYPE_AES_192: + keysize = 24; + break; + case PKEY_KEYTYPE_AES_256: + keysize = 32; + break; + default: + DEBUG_ERR("%s unknown/unsupported keytype %d\n", __func__, + keytype); + return -EINVAL; + } + + /* generate a dummy random clear key */ + get_random_bytes(clrkey.clrkey, keysize); + + /* convert it to a dummy protected key */ + rc = pkey_clr2protkey(keytype, &clrkey, protkey); + if (rc) + return rc; + + /* replace the key part of the protected key with random bytes */ + get_random_bytes(protkey->protkey, keysize); + + return 0; +} +EXPORT_SYMBOL(pkey_genprotkey); + +/* * File io functions */ @@ -1167,6 +1208,20 @@ static long pkey_unlocked_ioctl(struct file *filp, unsigned int cmd, return -EFAULT; break; } + case PKEY_GENPROTK: { + struct pkey_genprotk __user *ugp = (void __user *) arg; + struct pkey_genprotk kgp; + + if (copy_from_user(&kgp, ugp, sizeof(kgp))) + return -EFAULT; + rc = pkey_genprotkey(kgp.keytype, &kgp.protkey); + DEBUG_DBG("%s pkey_genprotkey()=%d\n", __func__, rc); + if (rc) + break; + if (copy_to_user(ugp, &kgp, sizeof(kgp))) + return -EFAULT; + break; + } default: /* unknown/unsupported ioctl cmd */ return -ENOTTY; |