| 1 |
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| 2 | |
| 3 | * RSA internal helpers
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| 4 | *
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| 5 | * Copyright (c) 2015, Intel Corporation
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| 6 | * Authors: Tadeusz Struk <[email protected]>
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| 7 |
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| 8 | #ifndef _RSA_HELPER_
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| 9 | #define _RSA_HELPER_
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| 10 | #include <linux/types.h>
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| 11 | #include <crypto/akcipher.h>
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| 12 |
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| 13 | |
| 14 | * rsa_key - RSA key structure
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| 15 | * @n : RSA modulus raw byte stream
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| 16 | * @e : RSA public exponent raw byte stream
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| 17 | * @d : RSA private exponent raw byte stream
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| 18 | * @p : RSA prime factor p of n raw byte stream
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| 19 | * @q : RSA prime factor q of n raw byte stream
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| 20 | * @dp : RSA exponent d mod (p - 1) raw byte stream
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| 21 | * @dq : RSA exponent d mod (q - 1) raw byte stream
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| 22 | * @qinv : RSA CRT coefficient q^(-1) mod p raw byte stream
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| 23 | * @n_sz : length in bytes of RSA modulus n
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| 24 | * @e_sz : length in bytes of RSA public exponent
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| 25 | * @d_sz : length in bytes of RSA private exponent
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| 26 | * @p_sz : length in bytes of p field
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| 27 | * @q_sz : length in bytes of q field
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| 28 | * @dp_sz : length in bytes of dp field
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| 29 | * @dq_sz : length in bytes of dq field
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| 30 | * @qinv_sz : length in bytes of qinv field
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| 31 |
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| 32 | struct rsa_key {
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| 33 | const u8 *n;
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| 34 | const u8 *e;
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| 35 | const u8 *d;
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| 36 | const u8 *p;
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| 37 | const u8 *q;
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| 38 | const u8 *dp;
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| 39 | const u8 *dq;
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| 40 | const u8 *qinv;
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| 41 | size_t n_sz;
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| 42 | size_t e_sz;
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| 43 | size_t d_sz;
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| 44 | size_t p_sz;
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| 45 | size_t q_sz;
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| 46 | size_t dp_sz;
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| 47 | size_t dq_sz;
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| 48 | size_t qinv_sz;
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| 49 | };
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| 50 |
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| 51 | int rsa_parse_pub_key(struct rsa_key *rsa_key, const void *key,
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| 52 | unsigned int key_len);
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| 53 |
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| 54 | int rsa_parse_priv_key(struct rsa_key *rsa_key, const void *key,
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| 55 | unsigned int key_len);
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| 56 |
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| 57 | #define RSA_PUB (true)
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| 58 | #define RSA_PRIV (false)
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| 59 |
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| 60 | static inline int rsa_set_key(struct crypto_akcipher *child,
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| 61 | unsigned int *key_size, bool is_pubkey,
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| 62 | const void *key, unsigned int keylen)
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| 63 | {
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| 64 | int err;
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| 65 |
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| 66 | *key_size = 0;
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| 67 |
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| 68 | if (is_pubkey)
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| 69 | err = crypto_akcipher_set_pub_key(child, key, keylen);
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| 70 | else
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| 71 | err = crypto_akcipher_set_priv_key(child, key, keylen);
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| 72 | if (err)
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| 73 | return err;
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| 74 |
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| 75 |
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| 76 | err = crypto_akcipher_maxsize(child);
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| 77 | if (err > PAGE_SIZE)
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| 78 | return -ENOTSUPP;
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| 79 |
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| 80 | *key_size = err;
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| 81 | return 0;
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| 82 | }
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| 83 |
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| 84 | extern struct crypto_template rsa_pkcs1pad_tmpl;
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| 85 | extern struct crypto_template rsassa_pkcs1_tmpl;
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| 86 | #endif
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