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90 lines
2.2 KiB
90 lines
2.2 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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#include <crypto/curve25519.h> |
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#include <crypto/internal/kpp.h> |
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#include <crypto/kpp.h> |
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#include <linux/module.h> |
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#include <linux/scatterlist.h> |
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static int curve25519_set_secret(struct crypto_kpp *tfm, const void *buf, |
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unsigned int len) |
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{ |
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u8 *secret = kpp_tfm_ctx(tfm); |
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if (!len) |
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curve25519_generate_secret(secret); |
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else if (len == CURVE25519_KEY_SIZE && |
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crypto_memneq(buf, curve25519_null_point, CURVE25519_KEY_SIZE)) |
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memcpy(secret, buf, CURVE25519_KEY_SIZE); |
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else |
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return -EINVAL; |
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return 0; |
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} |
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static int curve25519_compute_value(struct kpp_request *req) |
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{ |
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struct crypto_kpp *tfm = crypto_kpp_reqtfm(req); |
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const u8 *secret = kpp_tfm_ctx(tfm); |
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u8 public_key[CURVE25519_KEY_SIZE]; |
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u8 buf[CURVE25519_KEY_SIZE]; |
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int copied, nbytes; |
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u8 const *bp; |
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if (req->src) { |
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copied = sg_copy_to_buffer(req->src, |
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sg_nents_for_len(req->src, |
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CURVE25519_KEY_SIZE), |
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public_key, CURVE25519_KEY_SIZE); |
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if (copied != CURVE25519_KEY_SIZE) |
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return -EINVAL; |
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bp = public_key; |
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} else { |
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bp = curve25519_base_point; |
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} |
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curve25519_generic(buf, secret, bp); |
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/* might want less than we've got */ |
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nbytes = min_t(size_t, CURVE25519_KEY_SIZE, req->dst_len); |
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copied = sg_copy_from_buffer(req->dst, sg_nents_for_len(req->dst, |
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nbytes), |
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buf, nbytes); |
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if (copied != nbytes) |
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return -EINVAL; |
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return 0; |
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} |
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static unsigned int curve25519_max_size(struct crypto_kpp *tfm) |
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{ |
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return CURVE25519_KEY_SIZE; |
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} |
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static struct kpp_alg curve25519_alg = { |
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.base.cra_name = "curve25519", |
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.base.cra_driver_name = "curve25519-generic", |
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.base.cra_priority = 100, |
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.base.cra_module = THIS_MODULE, |
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.base.cra_ctxsize = CURVE25519_KEY_SIZE, |
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.set_secret = curve25519_set_secret, |
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.generate_public_key = curve25519_compute_value, |
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.compute_shared_secret = curve25519_compute_value, |
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.max_size = curve25519_max_size, |
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}; |
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static int __init curve25519_init(void) |
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{ |
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return crypto_register_kpp(&curve25519_alg); |
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} |
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static void __exit curve25519_exit(void) |
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{ |
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crypto_unregister_kpp(&curve25519_alg); |
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} |
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subsys_initcall(curve25519_init); |
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module_exit(curve25519_exit); |
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MODULE_ALIAS_CRYPTO("curve25519"); |
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MODULE_ALIAS_CRYPTO("curve25519-generic"); |
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MODULE_LICENSE("GPL");
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