| /* 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@iahu.ca, http://libtomcrypt.org |
| */ |
| |
| #include "mycrypt.h" |
| |
| #ifdef MRSA |
| |
| int rsa_export(unsigned char *out, unsigned long *outlen, int type, rsa_key *key) |
| { |
| unsigned long y, z; |
| int err; |
| |
| _ARGCHK(out != NULL); |
| _ARGCHK(outlen != NULL); |
| _ARGCHK(key != NULL); |
| |
| /* can we store the static header? */ |
| if (*outlen < (PACKET_SIZE + 1)) { |
| return CRYPT_BUFFER_OVERFLOW; |
| } |
| |
| /* type valid? */ |
| if (!(key->type == PK_PRIVATE || key->type == PK_PRIVATE_OPTIMIZED) && |
| (type == PK_PRIVATE || type == PK_PRIVATE_OPTIMIZED)) { |
| return CRYPT_PK_INVALID_TYPE; |
| } |
| |
| /* start at offset y=PACKET_SIZE */ |
| y = PACKET_SIZE; |
| |
| /* output key type */ |
| out[y++] = type; |
| |
| /* output modulus */ |
| OUTPUT_BIGNUM(&key->N, out, y, z); |
| |
| /* output public key */ |
| OUTPUT_BIGNUM(&key->e, out, y, z); |
| |
| if (type == PK_PRIVATE || type == PK_PRIVATE_OPTIMIZED) { |
| OUTPUT_BIGNUM(&key->d, out, y, z); |
| } |
| |
| if (type == PK_PRIVATE_OPTIMIZED) { |
| OUTPUT_BIGNUM(&key->dQ, out, y, z); |
| OUTPUT_BIGNUM(&key->dP, out, y, z); |
| OUTPUT_BIGNUM(&key->pQ, out, y, z); |
| OUTPUT_BIGNUM(&key->qP, out, y, z); |
| OUTPUT_BIGNUM(&key->p, out, y, z); |
| OUTPUT_BIGNUM(&key->q, out, y, z); |
| } |
| |
| /* store packet header */ |
| packet_store_header(out, PACKET_SECT_RSA, PACKET_SUB_KEY); |
| |
| /* copy to the user buffer */ |
| *outlen = y; |
| |
| /* clear stack and return */ |
| return CRYPT_OK; |
| } |
| |
| #endif /* MRSA */ |
| |