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libgcrypt: simplify code of _libssh2_dsa_sha1_sign

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Signed-off-by: Simon Josefsson <simon@josefsson.org>
This commit is contained in:
Kamil Dudka
2009-12-06 14:35:03 +01:00
committed by Simon Josefsson
parent 1f91ab049f
commit 39cbd17e19
1 changed files with 16 additions and 25 deletions
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41
src/libgcrypt.c
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@@ -429,26 +429,20 @@ _libssh2_dsa_sha1_sign(libssh2_dsa_ctx * dsactx,
/* Extract R. */
data = gcry_sexp_find_token(sig_sexp, "r", 0);
if (!data) {
ret = -1;
goto out;
}
if (!data)
goto err;
tmp = gcry_sexp_nth_data(data, 1, &size);
if (!tmp) {
ret = -1;
goto out;
}
if (!tmp)
goto err;
if (tmp[0] == '\0') {
tmp++;
size--;
}
if (size < 1 || size > 20) {
ret = -1;
goto out;
}
if (size < 1 || size > 20)
goto err;
memcpy(sig + (20 - size), tmp, size);
@@ -457,30 +451,27 @@ _libssh2_dsa_sha1_sign(libssh2_dsa_ctx * dsactx,
/* Extract S. */
data = gcry_sexp_find_token(sig_sexp, "s", 0);
if (!data) {
ret = -1;
goto out;
}
if (!data)
goto err;
tmp = gcry_sexp_nth_data(data, 1, &size);
if (!tmp) {
ret = -1;
goto out;
}
if (!tmp)
goto err;
if (tmp[0] == '\0') {
tmp++;
size--;
}
if (size < 1 || size > 20) {
ret = -1;
goto out;
}
if (size < 1 || size > 20)
goto err;
memcpy(sig + 20 + (20 - size), tmp, size);
goto out;
err:
ret = -1;
ret = 0;
out:
if (sig_sexp) {
gcry_sexp_release(sig_sexp);