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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| /* 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. | ||
| */ | ||
| #include "tomcrypt_private.h" | ||
|
|
||
| /** | ||
| @file rsa_key.c | ||
| Free an RSA key, Tom St Denis | ||
| Basic operations on an RSA key, Steffen Jaeckel | ||
| */ | ||
|
|
||
| #ifdef LTC_MRSA | ||
| #include <stdarg.h> | ||
|
|
||
| static void _mpi_shrink_multi(void **a, ...) | ||
| { | ||
| void **cur; | ||
| unsigned n; | ||
| int err; | ||
| va_list args; | ||
| void *tmp[10] = { 0 }; | ||
|
|
||
| n = 0; | ||
| err = CRYPT_ERROR; | ||
| cur = a; | ||
| va_start(args, a); | ||
| while (cur != NULL) { | ||
| if (n >= sizeof(tmp)/sizeof(tmp[0])) { | ||
| goto out; | ||
| } | ||
| if (*cur != NULL) { | ||
| if ((err = mp_init_copy(&tmp[n], *cur)) != CRYPT_OK) { | ||
| goto out; | ||
| } | ||
| n++; | ||
| } | ||
| cur = va_arg(args, void**); | ||
| } | ||
| va_end(args); | ||
|
|
||
| n = 0; | ||
| cur = a; | ||
| va_start(args, a); | ||
| while (cur != NULL) { | ||
| if (*cur != NULL) { | ||
| mp_clear(*cur); | ||
| *cur = tmp[n]; | ||
| n++; | ||
| } | ||
| cur = va_arg(args, void**); | ||
| } | ||
| out: | ||
| va_end(args); | ||
| /* clean-up after an error | ||
| * or after this was called with too many args | ||
| */ | ||
| if ((err != CRYPT_OK) || | ||
| (n >= sizeof(tmp)/sizeof(tmp[0]))) { | ||
| for (n = 0; n < sizeof(tmp)/sizeof(tmp[0]); ++n) { | ||
| if (tmp[n] != NULL) { | ||
| mp_clear(tmp[n]); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| This shrinks the allocated memory of a RSA key | ||
| It will use up some more memory temporarily, | ||
| but then it will free-up the entire sequence that | ||
| was once allocated when the key was created/populated. | ||
| @param key The RSA key to shrink | ||
| */ | ||
| void rsa_shrink_key(rsa_key *key) | ||
| { | ||
| LTC_ARGCHKVD(key != NULL); | ||
| _mpi_shrink_multi(&key->q, &key->p, &key->qP, &key->dP, &key->dQ, &key->N, &key->d, &key->e, NULL); | ||
| } | ||
|
|
||
| /** | ||
| Init an RSA key | ||
| @param key The RSA key to free | ||
| @return CRYPT_OK if successful | ||
| */ | ||
| int rsa_init(rsa_key *key) | ||
| { | ||
| LTC_ARGCHK(key != NULL); | ||
| return mp_init_multi(&key->e, &key->d, &key->N, &key->dQ, &key->dP, &key->qP, &key->p, &key->q, NULL); | ||
| } | ||
|
|
||
| /** | ||
| Free an RSA key from memory | ||
| @param key The RSA key to free | ||
| */ | ||
| void rsa_free(rsa_key *key) | ||
| { | ||
| LTC_ARGCHKVD(key != NULL); | ||
| mp_cleanup_multi(&key->q, &key->p, &key->qP, &key->dP, &key->dQ, &key->N, &key->d, &key->e, NULL); | ||
| } | ||
|
|
||
| #endif | ||
|
|
||
| /* ref: $Format:%D$ */ | ||
| /* git commit: $Format:%H$ */ | ||
| /* commit time: $Format:%ai$ */ |
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