summaryrefslogtreecommitdiff
path: root/lib/crypto/mpi/mpicoder.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/crypto/mpi/mpicoder.c')
-rw-r--r--lib/crypto/mpi/mpicoder.c336
1 files changed, 0 insertions, 336 deletions
diff --git a/lib/crypto/mpi/mpicoder.c b/lib/crypto/mpi/mpicoder.c
index 3cb6bd148fa9..dde01030807d 100644
--- a/lib/crypto/mpi/mpicoder.c
+++ b/lib/crypto/mpi/mpicoder.c
@@ -25,7 +25,6 @@
#include <linux/string.h>
#include "mpi-internal.h"
-#define MAX_EXTERN_SCAN_BYTES (16*1024*1024)
#define MAX_EXTERN_MPI_BITS 16384
/**
@@ -110,112 +109,6 @@ MPI mpi_read_from_buffer(const void *xbuffer, unsigned *ret_nread)
}
EXPORT_SYMBOL_GPL(mpi_read_from_buffer);
-/****************
- * Fill the mpi VAL from the hex string in STR.
- */
-int mpi_fromstr(MPI val, const char *str)
-{
- int sign = 0;
- int prepend_zero = 0;
- int i, j, c, c1, c2;
- unsigned int nbits, nbytes, nlimbs;
- mpi_limb_t a;
-
- if (*str == '-') {
- sign = 1;
- str++;
- }
-
- /* Skip optional hex prefix. */
- if (*str == '0' && str[1] == 'x')
- str += 2;
-
- nbits = strlen(str);
- if (nbits > MAX_EXTERN_SCAN_BYTES) {
- mpi_clear(val);
- return -EINVAL;
- }
- nbits *= 4;
- if ((nbits % 8))
- prepend_zero = 1;
-
- nbytes = (nbits+7) / 8;
- nlimbs = (nbytes+BYTES_PER_MPI_LIMB-1) / BYTES_PER_MPI_LIMB;
-
- if (val->alloced < nlimbs)
- mpi_resize(val, nlimbs);
-
- i = BYTES_PER_MPI_LIMB - (nbytes % BYTES_PER_MPI_LIMB);
- i %= BYTES_PER_MPI_LIMB;
- j = val->nlimbs = nlimbs;
- val->sign = sign;
- for (; j > 0; j--) {
- a = 0;
- for (; i < BYTES_PER_MPI_LIMB; i++) {
- if (prepend_zero) {
- c1 = '0';
- prepend_zero = 0;
- } else
- c1 = *str++;
-
- if (!c1) {
- mpi_clear(val);
- return -EINVAL;
- }
- c2 = *str++;
- if (!c2) {
- mpi_clear(val);
- return -EINVAL;
- }
- if (c1 >= '0' && c1 <= '9')
- c = c1 - '0';
- else if (c1 >= 'a' && c1 <= 'f')
- c = c1 - 'a' + 10;
- else if (c1 >= 'A' && c1 <= 'F')
- c = c1 - 'A' + 10;
- else {
- mpi_clear(val);
- return -EINVAL;
- }
- c <<= 4;
- if (c2 >= '0' && c2 <= '9')
- c |= c2 - '0';
- else if (c2 >= 'a' && c2 <= 'f')
- c |= c2 - 'a' + 10;
- else if (c2 >= 'A' && c2 <= 'F')
- c |= c2 - 'A' + 10;
- else {
- mpi_clear(val);
- return -EINVAL;
- }
- a <<= 8;
- a |= c;
- }
- i = 0;
- val->d[j-1] = a;
- }
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(mpi_fromstr);
-
-MPI mpi_scanval(const char *string)
-{
- MPI a;
-
- a = mpi_alloc(0);
- if (!a)
- return NULL;
-
- if (mpi_fromstr(a, string)) {
- mpi_free(a);
- return NULL;
- }
- mpi_normalize(a);
- return a;
-}
-EXPORT_SYMBOL_GPL(mpi_scanval);
-
static int count_lzeros(MPI a)
{
mpi_limb_t alimb;
@@ -521,232 +414,3 @@ MPI mpi_read_raw_from_sgl(struct scatterlist *sgl, unsigned int nbytes)
return val;
}
EXPORT_SYMBOL_GPL(mpi_read_raw_from_sgl);
-
-/* Perform a two's complement operation on buffer P of size N bytes. */
-static void twocompl(unsigned char *p, unsigned int n)
-{
- int i;
-
- for (i = n-1; i >= 0 && !p[i]; i--)
- ;
- if (i >= 0) {
- if ((p[i] & 0x01))
- p[i] = (((p[i] ^ 0xfe) | 0x01) & 0xff);
- else if ((p[i] & 0x02))
- p[i] = (((p[i] ^ 0xfc) | 0x02) & 0xfe);
- else if ((p[i] & 0x04))
- p[i] = (((p[i] ^ 0xf8) | 0x04) & 0xfc);
- else if ((p[i] & 0x08))
- p[i] = (((p[i] ^ 0xf0) | 0x08) & 0xf8);
- else if ((p[i] & 0x10))
- p[i] = (((p[i] ^ 0xe0) | 0x10) & 0xf0);
- else if ((p[i] & 0x20))
- p[i] = (((p[i] ^ 0xc0) | 0x20) & 0xe0);
- else if ((p[i] & 0x40))
- p[i] = (((p[i] ^ 0x80) | 0x40) & 0xc0);
- else
- p[i] = 0x80;
-
- for (i--; i >= 0; i--)
- p[i] ^= 0xff;
- }
-}
-
-int mpi_print(enum gcry_mpi_format format, unsigned char *buffer,
- size_t buflen, size_t *nwritten, MPI a)
-{
- unsigned int nbits = mpi_get_nbits(a);
- size_t len;
- size_t dummy_nwritten;
- int negative;
-
- if (!nwritten)
- nwritten = &dummy_nwritten;
-
- /* Libgcrypt does no always care to set clear the sign if the value
- * is 0. For printing this is a bit of a surprise, in particular
- * because if some of the formats don't support negative numbers but
- * should be able to print a zero. Thus we need this extra test
- * for a negative number.
- */
- if (a->sign && mpi_cmp_ui(a, 0))
- negative = 1;
- else
- negative = 0;
-
- len = buflen;
- *nwritten = 0;
- if (format == GCRYMPI_FMT_STD) {
- unsigned char *tmp;
- int extra = 0;
- unsigned int n;
-
- tmp = mpi_get_buffer(a, &n, NULL);
- if (!tmp)
- return -EINVAL;
-
- if (negative) {
- twocompl(tmp, n);
- if (!(*tmp & 0x80)) {
- /* Need to extend the sign. */
- n++;
- extra = 2;
- }
- } else if (n && (*tmp & 0x80)) {
- /* Positive but the high bit of the returned buffer is set.
- * Thus we need to print an extra leading 0x00 so that the
- * output is interpreted as a positive number.
- */
- n++;
- extra = 1;
- }
-
- if (buffer && n > len) {
- /* The provided buffer is too short. */
- kfree(tmp);
- return -E2BIG;
- }
- if (buffer) {
- unsigned char *s = buffer;
-
- if (extra == 1)
- *s++ = 0;
- else if (extra)
- *s++ = 0xff;
- memcpy(s, tmp, n-!!extra);
- }
- kfree(tmp);
- *nwritten = n;
- return 0;
- } else if (format == GCRYMPI_FMT_USG) {
- unsigned int n = (nbits + 7)/8;
-
- /* Note: We ignore the sign for this format. */
- /* FIXME: for performance reasons we should put this into
- * mpi_aprint because we can then use the buffer directly.
- */
-
- if (buffer && n > len)
- return -E2BIG;
- if (buffer) {
- unsigned char *tmp;
-
- tmp = mpi_get_buffer(a, &n, NULL);
- if (!tmp)
- return -EINVAL;
- memcpy(buffer, tmp, n);
- kfree(tmp);
- }
- *nwritten = n;
- return 0;
- } else if (format == GCRYMPI_FMT_PGP) {
- unsigned int n = (nbits + 7)/8;
-
- /* The PGP format can only handle unsigned integers. */
- if (negative)
- return -EINVAL;
-
- if (buffer && n+2 > len)
- return -E2BIG;
-
- if (buffer) {
- unsigned char *tmp;
- unsigned char *s = buffer;
-
- s[0] = nbits >> 8;
- s[1] = nbits;
-
- tmp = mpi_get_buffer(a, &n, NULL);
- if (!tmp)
- return -EINVAL;
- memcpy(s+2, tmp, n);
- kfree(tmp);
- }
- *nwritten = n+2;
- return 0;
- } else if (format == GCRYMPI_FMT_SSH) {
- unsigned char *tmp;
- int extra = 0;
- unsigned int n;
-
- tmp = mpi_get_buffer(a, &n, NULL);
- if (!tmp)
- return -EINVAL;
-
- if (negative) {
- twocompl(tmp, n);
- if (!(*tmp & 0x80)) {
- /* Need to extend the sign. */
- n++;
- extra = 2;
- }
- } else if (n && (*tmp & 0x80)) {
- n++;
- extra = 1;
- }
-
- if (buffer && n+4 > len) {
- kfree(tmp);
- return -E2BIG;
- }
-
- if (buffer) {
- unsigned char *s = buffer;
-
- *s++ = n >> 24;
- *s++ = n >> 16;
- *s++ = n >> 8;
- *s++ = n;
- if (extra == 1)
- *s++ = 0;
- else if (extra)
- *s++ = 0xff;
- memcpy(s, tmp, n-!!extra);
- }
- kfree(tmp);
- *nwritten = 4+n;
- return 0;
- } else if (format == GCRYMPI_FMT_HEX) {
- unsigned char *tmp;
- int i;
- int extra = 0;
- unsigned int n = 0;
-
- tmp = mpi_get_buffer(a, &n, NULL);
- if (!tmp)
- return -EINVAL;
- if (!n || (*tmp & 0x80))
- extra = 2;
-
- if (buffer && 2*n + extra + negative + 1 > len) {
- kfree(tmp);
- return -E2BIG;
- }
- if (buffer) {
- unsigned char *s = buffer;
-
- if (negative)
- *s++ = '-';
- if (extra) {
- *s++ = '0';
- *s++ = '0';
- }
-
- for (i = 0; i < n; i++) {
- unsigned int c = tmp[i];
-
- *s++ = (c >> 4) < 10 ? '0'+(c>>4) : 'A'+(c>>4)-10;
- c &= 15;
- *s++ = c < 10 ? '0'+c : 'A'+c-10;
- }
- *s++ = 0;
- *nwritten = s - buffer;
- } else {
- *nwritten = 2*n + extra + negative + 1;
- }
- kfree(tmp);
- return 0;
- } else
- return -EINVAL;
-}
-EXPORT_SYMBOL_GPL(mpi_print);
generated by cgit v1.2.3-70-g09d2 (git 2.47.1) at 2024-12-23 16:47:31 +0000