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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 | // SPDX-License-Identifier: GPL-2.0-or-later /* * RSA key extract helper * * Copyright (c) 2015, Intel Corporation * Authors: Tadeusz Struk <tadeusz.struk@intel.com> */ #include <linux/kernel.h> #include <linux/export.h> #include <linux/err.h> #include <linux/fips.h> #include <crypto/internal/rsa.h> #include "rsapubkey.asn1.h" #include "rsaprivkey.asn1.h" 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; /* invalid key provided */ if (!value || !vlen) return -EINVAL; if (fips_enabled) { while (n_sz && !*ptr) { ptr++; n_sz--; } /* In FIPS mode only allow key size 2K and higher */ if (n_sz < 256) { pr_err("RSA: key size not allowed in FIPS mode\n"); return -EINVAL; } } key->n = value; key->n_sz = vlen; return 0; } int rsa_get_e(void *context, size_t hdrlen, unsigned char tag, const void *value, size_t vlen) { struct rsa_key *key = context; /* invalid key provided */ if (!value || !key->n_sz || !vlen || vlen > key->n_sz) return -EINVAL; key->e = value; key->e_sz = vlen; return 0; } int rsa_get_d(void *context, size_t hdrlen, unsigned char tag, const void *value, size_t vlen) { struct rsa_key *key = context; /* invalid key provided */ if (!value || !key->n_sz || !vlen || vlen > key->n_sz) return -EINVAL; key->d = value; key->d_sz = vlen; return 0; } int rsa_get_p(void *context, size_t hdrlen, unsigned char tag, const void *value, size_t vlen) { struct rsa_key *key = context; /* invalid key provided */ if (!value || !vlen || vlen > key->n_sz) return -EINVAL; key->p = value; key->p_sz = vlen; return 0; } int rsa_get_q(void *context, size_t hdrlen, unsigned char tag, const void *value, size_t vlen) { struct rsa_key *key = context; /* invalid key provided */ if (!value || !vlen || vlen > key->n_sz) return -EINVAL; key->q = value; key->q_sz = vlen; return 0; } int rsa_get_dp(void *context, size_t hdrlen, unsigned char tag, const void *value, size_t vlen) { struct rsa_key *key = context; /* invalid key provided */ if (!value || !vlen || vlen > key->n_sz) return -EINVAL; key->dp = value; key->dp_sz = vlen; return 0; } int rsa_get_dq(void *context, size_t hdrlen, unsigned char tag, const void *value, size_t vlen) { struct rsa_key *key = context; /* invalid key provided */ if (!value || !vlen || vlen > key->n_sz) return -EINVAL; key->dq = value; key->dq_sz = vlen; return 0; } int rsa_get_qinv(void *context, size_t hdrlen, unsigned char tag, const void *value, size_t vlen) { struct rsa_key *key = context; /* invalid key provided */ if (!value || !vlen || vlen > key->n_sz) return -EINVAL; key->qinv = value; key->qinv_sz = vlen; return 0; } /** * 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 * @key_len: length of key * * Return: 0 on success or error code in case of error */ int rsa_parse_pub_key(struct rsa_key *rsa_key, const void *key, unsigned int key_len) { return asn1_ber_decoder(&rsapubkey_decoder, rsa_key, key, key_len); } EXPORT_SYMBOL_GPL(rsa_parse_pub_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 * @key_len: length of key * * Return: 0 on success or error code in case of error */ int rsa_parse_priv_key(struct rsa_key *rsa_key, const void *key, unsigned int key_len) { return asn1_ber_decoder(&rsaprivkey_decoder, rsa_key, key, key_len); } EXPORT_SYMBOL_GPL(rsa_parse_priv_key); |