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libgcrypt: Add helper to extract MPIs into ssh_strings

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* include/libssh/libgcrypt.h (ssh_sexp_extract_mpi): New prototype.
* src/libgcrypt.c (ssh_sexp_extract_mpi): New function.

Signed-off-by: Justus Winter <justus@g10code.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
This commit is contained in:
Justus Winter
2016-03-29 13:06:59 +02:00
committed by Andreas Schneider
parent fea9e3050c
commit 735e34f932
2 changed files with 62 additions and 0 deletions
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10
include/libssh/libgcrypt.h
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@@ -71,6 +71,16 @@ char *ssh_gcry_bn2dec(bignum bn);
#define bignum_bn2bin(num,datalen,data) gcry_mpi_print(GCRYMPI_FMT_USG,data,datalen,NULL,num)
#define bignum_cmp(num1,num2) gcry_mpi_cmp(num1,num2)
/* Helper functions for data conversions. */
/* Extract an MPI from the given s-expression SEXP named NAME which is
encoded using INFORMAT and store it in a newly allocated ssh_string
encoded using OUTFORMAT. */
ssh_string ssh_sexp_extract_mpi(const gcry_sexp_t sexp,
const char *name,
enum gcry_mpi_format informat,
enum gcry_mpi_format outformat);
#endif /* HAVE_LIBGCRYPT */
struct ssh_cipher_struct *ssh_get_ciphertab(void);