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/* $Id: rsa.c,v 1.6 2017/01/24 13:32:55 jsing Exp $ */ |
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/* |
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* Copyright (c) 2016 Kristaps Dzonsons <kristaps@bsd.lv> |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include <err.h> |
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#include <stdlib.h> |
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#include <unistd.h> |
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#include <openssl/evp.h> |
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#include <openssl/pem.h> |
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#include <openssl/rsa.h> |
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#include "rsa.h" |
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/* |
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* Default number of bits when creating a new key. |
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*/ |
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#define KBITS 4096 |
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/* |
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* Create an RSA key with the default KBITS number of bits. |
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*/ |
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EVP_PKEY * |
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rsa_key_create(FILE *f, const char *fname) |
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{ |
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EVP_PKEY_CTX *ctx = NULL; |
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EVP_PKEY *pkey = NULL; |
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/* First, create the context and the key. */ |
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if ((ctx = EVP_PKEY_CTX_new_id(EVP_PKEY_RSA, NULL)) == NULL) { |
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warnx("EVP_PKEY_CTX_new_id"); |
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goto err; |
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} else if (EVP_PKEY_keygen_init(ctx) <= 0) { |
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warnx("EVP_PKEY_keygen_init"); |
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goto err; |
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} else if (EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, KBITS) <= 0) { |
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warnx("EVP_PKEY_set_rsa_keygen_bits"); |
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goto err; |
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} else if (EVP_PKEY_keygen(ctx, &pkey) <= 0) { |
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warnx("EVP_PKEY_keygen"); |
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goto err; |
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} |
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/* Serialise the key to the disc. */ |
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if (PEM_write_PrivateKey(f, pkey, NULL, NULL, 0, NULL, NULL)) |
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goto out; |
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warnx("%s: PEM_write_PrivateKey", fname); |
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err: |
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if (pkey != NULL) |
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EVP_PKEY_free(pkey); |
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pkey = NULL; |
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out: |
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if (ctx != NULL) |
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EVP_PKEY_CTX_free(ctx); |
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return pkey; |
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} |
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EVP_PKEY * |
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rsa_key_load(FILE *f, const char *fname) |
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{ |
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EVP_PKEY *pkey; |
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pkey = PEM_read_PrivateKey(f, NULL, NULL, NULL); |
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if (pkey == NULL) { |
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warnx("%s: PEM_read_PrivateKey", fname); |
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return NULL; |
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} else if (EVP_PKEY_type(pkey->type) == EVP_PKEY_RSA) |
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return pkey; |
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warnx("%s: unsupported key type", fname); |
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EVP_PKEY_free(pkey); |
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return NULL; |
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} |