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Diffstat (limited to 'core/lib/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c')
| -rw-r--r-- | core/lib/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/core/lib/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c b/core/lib/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c new file mode 100644 index 0000000..d01e5b6 --- /dev/null +++ b/core/lib/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c @@ -0,0 +1,129 @@ +/* + * Copyright (c) 2001-2007, Tom St Denis + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtom.org + */ +#include "tomcrypt.h" + +/** + @file rsa_encrypt_key.c + RSA PKCS #1 encryption, Tom St Denis and Andreas Lange +*/ + +#ifdef LTC_MRSA + +/** + (PKCS #1 v2.0) OAEP pad then encrypt + @param in The plaintext + @param inlen The length of the plaintext (octets) + @param out [out] The ciphertext + @param outlen [in/out] The max size and resulting size of the ciphertext + @param lparam The system "lparam" for the encryption + @param lparamlen The length of lparam (octets) + @param prng An active PRNG + @param prng_idx The index of the desired prng + @param hash_idx The index of the desired hash + @param padding Type of padding (LTC_PKCS_1_OAEP or LTC_PKCS_1_V1_5) + @param key The RSA key to encrypt to + @return CRYPT_OK if successful +*/ +int rsa_encrypt_key_ex(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen, + const unsigned char *lparam, unsigned long lparamlen, + prng_state *prng, int prng_idx, int hash_idx, int padding, rsa_key *key) +{ + unsigned long modulus_bitlen, modulus_bytelen, x; + int err; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(key != NULL); + + /* valid padding? */ + if ((padding != LTC_PKCS_1_V1_5) && + (padding != LTC_PKCS_1_OAEP)) { + return CRYPT_PK_INVALID_PADDING; + } + + /* valid prng? */ + if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) { + return err; + } + + if (padding == LTC_PKCS_1_OAEP) { + /* valid hash? */ + if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { + return err; + } + } + + /* get modulus len in bits */ + modulus_bitlen = mp_count_bits( (key->N)); + + /* outlen must be at least the size of the modulus */ + modulus_bytelen = mp_unsigned_bin_size( (key->N)); + if (modulus_bytelen > *outlen) { + *outlen = modulus_bytelen; + return CRYPT_BUFFER_OVERFLOW; + } + + if (padding == LTC_PKCS_1_OAEP) { + /* OAEP pad the key */ + x = *outlen; + if ((err = pkcs_1_oaep_encode(in, inlen, lparam, + lparamlen, modulus_bitlen, prng, prng_idx, hash_idx, + out, &x)) != CRYPT_OK) { + return err; + } + } else { + /* PKCS #1 v1.5 pad the key */ + x = *outlen; + if ((err = pkcs_1_v1_5_encode(in, inlen, LTC_PKCS_1_EME, + modulus_bitlen, prng, prng_idx, + out, &x)) != CRYPT_OK) { + return err; + } + } + + /* rsa exptmod the OAEP or PKCS #1 v1.5 pad */ + return ltc_mp.rsa_me(out, x, out, outlen, PK_PUBLIC, key); +} + +#endif /* LTC_MRSA */ + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c,v $ */ +/* $Revision: 1.10 $ */ +/* $Date: 2007/05/12 14:32:35 $ */ |