1f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* LibTomCrypt, modular cryptographic library -- Tom St Denis 2f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 3f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * LibTomCrypt is a library that provides various cryptographic 4f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * algorithms in a highly modular and flexible manner. 5f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 6f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * The library is free for all purposes without any express 7f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * guarantee it works. 8f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 9f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com 10f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project */ 11f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#include "tomcrypt.h" 12f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 13f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/** 14f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @file rsa_encrypt_key.c 15f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project RSA PKCS #1 encryption, Tom St Denis and Andreas Lange 16f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project*/ 17f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 18f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#ifdef MRSA 19f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 20f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/** 21f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project (PKCS #1 v2.0) OAEP pad then encrypt 22f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param in The plaintext 23f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param inlen The length of the plaintext (octets) 24f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param out [out] The ciphertext 25f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param outlen [in/out] The max size and resulting size of the ciphertext 26f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param lparam The system "lparam" for the encryption 27f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param lparamlen The length of lparam (octets) 28f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param prng An active PRNG 29f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param prng_idx The index of the desired prng 30f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param hash_idx The index of the desired hash 31f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param padding Type of padding (LTC_PKCS_1_OAEP or LTC_PKCS_1_V1_5) 32f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param key The RSA key to encrypt to 33f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @return CRYPT_OK if successful 34f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project*/ 35f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectint rsa_encrypt_key_ex(const unsigned char *in, unsigned long inlen, 36f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project unsigned char *out, unsigned long *outlen, 37f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project const unsigned char *lparam, unsigned long lparamlen, 38f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project prng_state *prng, int prng_idx, int hash_idx, int padding, rsa_key *key) 39f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project{ 40f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project unsigned long modulus_bitlen, modulus_bytelen, x; 41f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project int err; 42f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 43f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project LTC_ARGCHK(in != NULL); 44f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project LTC_ARGCHK(out != NULL); 45f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project LTC_ARGCHK(outlen != NULL); 46f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project LTC_ARGCHK(key != NULL); 47f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 48f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* valid padding? */ 49f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((padding != LTC_PKCS_1_V1_5) && 50f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project (padding != LTC_PKCS_1_OAEP)) { 51f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return CRYPT_PK_INVALID_PADDING; 52f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 53f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 54f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* valid prng? */ 55f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) { 56f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return err; 57f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 58f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 59f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if (padding == LTC_PKCS_1_OAEP) { 60f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* valid hash? */ 61f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { 62f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return err; 63f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 64f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 65f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 66f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* get modulus len in bits */ 67f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project modulus_bitlen = mp_count_bits( (key->N)); 68f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 69f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* outlen must be at least the size of the modulus */ 70f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project modulus_bytelen = mp_unsigned_bin_size( (key->N)); 71f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if (modulus_bytelen > *outlen) { 72f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project *outlen = modulus_bytelen; 73f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return CRYPT_BUFFER_OVERFLOW; 74f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 75f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 76f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if (padding == LTC_PKCS_1_OAEP) { 77f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* OAEP pad the key */ 78f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project x = *outlen; 79f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = pkcs_1_oaep_encode(in, inlen, lparam, 80f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project lparamlen, modulus_bitlen, prng, prng_idx, hash_idx, 81f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project out, &x)) != CRYPT_OK) { 82f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return err; 83f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 84f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } else { 85f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* PKCS #1 v1.5 pad the key */ 86f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project x = *outlen; 87f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((err = pkcs_1_v1_5_encode(in, inlen, LTC_PKCS_1_EME, 88f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project modulus_bitlen, prng, prng_idx, 89f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project out, &x)) != CRYPT_OK) { 90f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return err; 91f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 92f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 93f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 94f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* rsa exptmod the OAEP or PKCS #1 v1.5 pad */ 95f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return ltc_mp.rsa_me(out, x, out, outlen, PK_PUBLIC, key); 96f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project} 97f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 98f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#endif /* MRSA */ 99f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 100f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c,v $ */ 101f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Revision: 1.8 $ */ 102f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Date: 2006/11/01 09:18:22 $ */ 103