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62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
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#include <config.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <ctype.h>
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#include <assert.h>
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#include "util.h"
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#include "openpgpdefs.h"
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gcry_mpi_t
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openpgp_ecc_parse_pubkey (pubkey_algo_t pkalgo, const char *curve_oid,
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gcry_mpi_t pubkey)
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{
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unsigned int nbits = 0;
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unsigned char *buf = NULL;
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const char *curve = openpgp_oid_to_curve (curve_oid, 1);
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if (curve == NULL)
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curve = curve_oid;
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if ((pkalgo == PUBKEY_ALGO_EDDSA && !strcmp (curve, "Ed448"))
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|| (pkalgo == PUBKEY_ALGO_ECDH && !strcmp (curve, "X448")))
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buf = gcry_mpi_get_opaque (pubkey, &nbits);
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if (nbits == 0
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|| (pkalgo == PUBKEY_ALGO_EDDSA && (nbits+7)/8 == (448 + 8)/8)
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|| (pkalgo == PUBKEY_ALGO_ECDH && (nbits+7)/8 == 448/8))
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return gcry_mpi_copy (pubkey);
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if (pkalgo == PUBKEY_ALGO_EDDSA)
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return gcry_mpi_set_opaque_copy (NULL, buf+1, 8 + 448);
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else
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return gcry_mpi_set_opaque_copy (NULL, buf+1, 448);
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}
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gcry_mpi_t
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openpgp_ecc_parse_seckey (pubkey_algo_t pkalgo, const char *curve_oid,
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gcry_mpi_t seckey)
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{
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unsigned int nbits = 0;
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unsigned char *buf = NULL;
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const char *curve = openpgp_oid_to_curve (curve_oid, 1);
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if (curve == NULL)
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curve = curve_oid;
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if ((pkalgo == PUBKEY_ALGO_EDDSA && !strcmp (curve, "Ed448"))
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|| (pkalgo == PUBKEY_ALGO_ECDH && !strcmp (curve, "X448")))
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buf = gcry_mpi_get_opaque (seckey, &nbits);
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if (nbits == 0
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|| (pkalgo == PUBKEY_ALGO_EDDSA && (nbits+7)/8 == (448 + 8)/8)
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|| (pkalgo == PUBKEY_ALGO_ECDH && (nbits+7)/8 == 448/8))
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return gcry_mpi_copy (seckey);
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if (pkalgo == PUBKEY_ALGO_EDDSA)
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return gcry_mpi_set_opaque_copy (NULL, buf+1, 8 + 448);
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else
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return gcry_mpi_set_opaque_copy (NULL, buf+1, 448);
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}
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