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Simplify crypto/evp/print.c.

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First, stop trying to pre-size the buffer and just have bn_print
allocate the buffer internally. That removes the need for all the
algorithms being two-pass.

While I'm here, stop passing the unused ASN1_PCTX parameters in
everywhere.

As a side effect, this fixes a int vs size_t instance that flagged
-Wshorten-64-32, but it ended up being a much more substantial change.

Bug: 516
Change-Id: Ic210604de85539559b1ed88889ca6a08dfb20bde
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/54948
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Bob Beck <bbe@google.com>
fips-20230428
David Benjamin 3 years ago committed by Boringssl LUCI CQ
parent 1ec335da79
commit 3592aa3009
2 changed files with 113 additions and 223 deletions
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  1. 310
      crypto/evp/print.c
  2. 2
      include/openssl/bio.h

310
crypto/evp/print.c
Unescape View File

@ -64,8 +64,7 @@
#include "../fipsmodule/rsa/internal.h"
static int bn_print(BIO *bp, const char *number, const BIGNUM *num,
uint8_t *buf, int off) {
static int bn_print(BIO *bp, const char *name, const BIGNUM *num, int off) {
if (num == NULL) {
return 1;
}
@ -74,7 +73,7 @@ static int bn_print(BIO *bp, const char *number, const BIGNUM *num,
return 0;
}
if (BN_is_zero(num)) {
if (BIO_printf(bp, "%s 0\n", number) <= 0) {
if (BIO_printf(bp, "%s 0\n", name) <= 0) {
return 0;
}
return 1;
@ -83,131 +82,110 @@ static int bn_print(BIO *bp, const char *number, const BIGNUM *num,
uint64_t u64;
if (BN_get_u64(num, &u64)) {
const char *neg = BN_is_negative(num) ? "-" : "";
if (BIO_printf(bp, "%s %s%" PRIu64 " (%s0x%" PRIx64 ")\n", number, neg, u64,
neg, u64) <= 0) {
return 0;
return BIO_printf(bp, "%s %s%" PRIu64 " (%s0x%" PRIx64 ")\n", name, neg,
u64, neg, u64) > 0;
}
} else {
buf[0] = 0;
if (BIO_printf(bp, "%s%s", number,
if (BIO_printf(bp, "%s%s", name,
(BN_is_negative(num)) ? " (Negative)" : "") <= 0) {
return 0;
}
int n = BN_bn2bin(num, &buf[1]);
if (buf[1] & 0x80) {
n++;
// Print |num| in hex, adding a leading zero, as in ASN.1, if the high bit
// is set.
//
// TODO(davidben): Do we need to do this? We already print "(Negative)" above
// and negative values are never valid in keys anyway.
size_t len = BN_num_bytes(num);
uint8_t *buf = OPENSSL_malloc(len + 1);
if (buf == NULL) {
OPENSSL_PUT_ERROR(EVP, ERR_R_MALLOC_FAILURE);
return 0;
}
buf[0] = 0;
BN_bn2bin(num, buf + 1);
const uint8_t *data = buf;
if (len > 0 && (buf[1] & 0x80) != 0) {
len++; // Print the whole buffer.
} else {
buf++;
data = buf + 1; // Skip the leading zero.
}
int i;
for (i = 0; i < n; i++) {
int ret = 0;
for (size_t i = 0; i < len; i++) {
if ((i % 15) == 0) {
if (BIO_puts(bp, "\n") <= 0 ||
if (BIO_puts(bp, "\n") <= 0 || //
!BIO_indent(bp, off + 4, 128)) {
return 0;
goto err;
}
}
if (BIO_printf(bp, "%02x%s", buf[i], ((i + 1) == n) ? "" : ":") <= 0) {
return 0;
if (BIO_printf(bp, "%02x%s", data[i], (i + 1 == len) ? "" : ":") <= 0) {
goto err;
}
}
if (BIO_write(bp, "\n", 1) <= 0) {
return 0;
}
goto err;
}
return 1;
}
static void update_buflen(const BIGNUM *b, size_t *pbuflen) {
if (!b) {
return;
}
ret = 1;
size_t len = BN_num_bytes(b);
if (*pbuflen < len) {
*pbuflen = len;
}
err:
OPENSSL_free(buf);
return ret;
}
// RSA keys.
static int do_rsa_print(BIO *out, const RSA *rsa, int off,
int include_private) {
const char *s, *str;
uint8_t *m = NULL;
int ret = 0, mod_len = 0;
size_t buf_len = 0;
update_buflen(rsa->n, &buf_len);
update_buflen(rsa->e, &buf_len);
if (include_private) {
update_buflen(rsa->d, &buf_len);
update_buflen(rsa->p, &buf_len);
update_buflen(rsa->q, &buf_len);
update_buflen(rsa->dmp1, &buf_len);
update_buflen(rsa->dmq1, &buf_len);
update_buflen(rsa->iqmp, &buf_len);
}
m = (uint8_t *)OPENSSL_malloc(buf_len + 10);
if (m == NULL) {
OPENSSL_PUT_ERROR(EVP, ERR_R_MALLOC_FAILURE);
goto err;
}
int mod_len = 0;
if (rsa->n != NULL) {
mod_len = BN_num_bits(rsa->n);
}
if (!BIO_indent(out, off, 128)) {
goto err;
return 0;
}
const char *s, *str;
if (include_private && rsa->d) {
if (BIO_printf(out, "Private-Key: (%d bit)\n", mod_len) <= 0) {
goto err;
return 0;
}
str = "modulus:";
s = "publicExponent:";
} else {
if (BIO_printf(out, "Public-Key: (%d bit)\n", mod_len) <= 0) {
goto err;
return 0;
}
str = "Modulus:";
s = "Exponent:";
}
if (!bn_print(out, str, rsa->n, m, off) ||
!bn_print(out, s, rsa->e, m, off)) {
goto err;
if (!bn_print(out, str, rsa->n, off) ||
!bn_print(out, s, rsa->e, off)) {
return 0;
}
if (include_private) {
if (!bn_print(out, "privateExponent:", rsa->d, m, off) ||
!bn_print(out, "prime1:", rsa->p, m, off) ||
!bn_print(out, "prime2:", rsa->q, m, off) ||
!bn_print(out, "exponent1:", rsa->dmp1, m, off) ||
!bn_print(out, "exponent2:", rsa->dmq1, m, off) ||
!bn_print(out, "coefficient:", rsa->iqmp, m, off)) {
goto err;
if (!bn_print(out, "privateExponent:", rsa->d, off) ||
!bn_print(out, "prime1:", rsa->p, off) ||
!bn_print(out, "prime2:", rsa->q, off) ||
!bn_print(out, "exponent1:", rsa->dmp1, off) ||
!bn_print(out, "exponent2:", rsa->dmq1, off) ||
!bn_print(out, "coefficient:", rsa->iqmp, off)) {
return 0;
}
}
ret = 1;
err:
OPENSSL_free(m);
return ret;
return 1;
}
static int rsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *ctx) {
static int rsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent) {
return do_rsa_print(bp, pkey->pkey.rsa, indent, 0);
}
static int rsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *ctx) {
static int rsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent) {
return do_rsa_print(bp, pkey->pkey.rsa, indent, 1);
}
@ -215,75 +193,50 @@ static int rsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
// DSA keys.
static int do_dsa_print(BIO *bp, const DSA *x, int off, int ptype) {
uint8_t *m = NULL;
int ret = 0;
size_t buf_len = 0;
const char *ktype = NULL;
const BIGNUM *priv_key, *pub_key;
priv_key = NULL;
const BIGNUM *priv_key = NULL;
if (ptype == 2) {
priv_key = x->priv_key;
}
pub_key = NULL;
const BIGNUM *pub_key = NULL;
if (ptype > 0) {
pub_key = x->pub_key;
}
ktype = "DSA-Parameters";
const char *ktype = "DSA-Parameters";
if (ptype == 2) {
ktype = "Private-Key";
} else if (ptype == 1) {
ktype = "Public-Key";
}
update_buflen(x->p, &buf_len);
update_buflen(x->q, &buf_len);
update_buflen(x->g, &buf_len);
update_buflen(priv_key, &buf_len);
update_buflen(pub_key, &buf_len);
m = (uint8_t *)OPENSSL_malloc(buf_len + 10);
if (m == NULL) {
OPENSSL_PUT_ERROR(EVP, ERR_R_MALLOC_FAILURE);
goto err;
}
if (priv_key) {
if (!BIO_indent(bp, off, 128) ||
BIO_printf(bp, "%s: (%u bit)\n", ktype, BN_num_bits(x->p)) <= 0) {
goto err;
return 0;
}
}
if (!bn_print(bp, "priv:", priv_key, m, off) ||
!bn_print(bp, "pub: ", pub_key, m, off) ||
!bn_print(bp, "P: ", x->p, m, off) ||
!bn_print(bp, "Q: ", x->q, m, off) ||
!bn_print(bp, "G: ", x->g, m, off)) {
goto err;
if (!bn_print(bp, "priv:", priv_key, off) ||
!bn_print(bp, "pub: ", pub_key, off) ||
!bn_print(bp, "P: ", x->p, off) ||
!bn_print(bp, "Q: ", x->q, off) ||
!bn_print(bp, "G: ", x->g, off)) {
return 0;
}
ret = 1;
err:
OPENSSL_free(m);
return ret;
return 1;
}
static int dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *ctx) {
static int dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent) {
return do_dsa_print(bp, pkey->pkey.dsa, indent, 0);
}
static int dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *ctx) {
static int dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent) {
return do_dsa_print(bp, pkey->pkey.dsa, indent, 1);
}
static int dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *ctx) {
static int dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent) {
return do_dsa_print(bp, pkey->pkey.dsa, indent, 2);
}
@ -291,70 +244,13 @@ static int dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
// EC keys.
static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, int ktype) {
uint8_t *buffer = NULL;
const char *ecstr;
size_t buf_len = 0, i;
int ret = 0, reason = ERR_R_BIO_LIB;
BIGNUM *order = NULL;
BN_CTX *ctx = NULL;
const EC_GROUP *group;
const EC_POINT *public_key;
const BIGNUM *priv_key;
uint8_t *pub_key_bytes = NULL;
size_t pub_key_bytes_len = 0;
if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL) {
reason = ERR_R_PASSED_NULL_PARAMETER;
goto err;
}
ctx = BN_CTX_new();
if (ctx == NULL) {
reason = ERR_R_MALLOC_FAILURE;
goto err;
}
if (ktype > 0) {
public_key = EC_KEY_get0_public_key(x);
if (public_key != NULL) {
pub_key_bytes_len = EC_POINT_point2oct(
group, public_key, EC_KEY_get_conv_form(x), NULL, 0, ctx);
if (pub_key_bytes_len == 0) {
reason = ERR_R_MALLOC_FAILURE;
goto err;
}
pub_key_bytes = OPENSSL_malloc(pub_key_bytes_len);
if (pub_key_bytes == NULL) {
reason = ERR_R_MALLOC_FAILURE;
goto err;
}
pub_key_bytes_len =
EC_POINT_point2oct(group, public_key, EC_KEY_get_conv_form(x),
pub_key_bytes, pub_key_bytes_len, ctx);
if (pub_key_bytes_len == 0) {
reason = ERR_R_MALLOC_FAILURE;
goto err;
}
buf_len = pub_key_bytes_len;
}
}
if (ktype == 2) {
priv_key = EC_KEY_get0_private_key(x);
if (priv_key && (i = (size_t)BN_num_bytes(priv_key)) > buf_len) {
buf_len = i;
}
} else {
priv_key = NULL;
OPENSSL_PUT_ERROR(EVP, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if (ktype > 0) {
buf_len += 10;
if ((buffer = OPENSSL_malloc(buf_len)) == NULL) {
reason = ERR_R_MALLOC_FAILURE;
goto err;
}
}
const char *ecstr;
if (ktype == 2) {
ecstr = "Private-Key";
} else if (ktype == 1) {
@ -364,62 +260,56 @@ static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, int ktype) {
}
if (!BIO_indent(bp, off, 128)) {
goto err;
return 0;
}
order = BN_new();
if (order == NULL || !EC_GROUP_get_order(group, order, NULL) ||
BIO_printf(bp, "%s: (%u bit)\n", ecstr, BN_num_bits(order)) <= 0) {
goto err;
if (BIO_printf(bp, "%s: (%u bit)\n", ecstr,
BN_num_bits(EC_GROUP_get0_order(group))) <= 0) {
return 0;
}
if ((priv_key != NULL) &&
!bn_print(bp, "priv:", priv_key, buffer, off)) {
goto err;
if (ktype == 2) {
const BIGNUM *priv_key = EC_KEY_get0_private_key(x);
if (priv_key != NULL && //
!bn_print(bp, "priv:", priv_key, off)) {
return 0;
}
if (pub_key_bytes != NULL) {
BIO_hexdump(bp, pub_key_bytes, pub_key_bytes_len, off);
}
// TODO(fork): implement
/*
if (!ECPKParameters_print(bp, group, off))
goto err; */
ret = 1;
err:
if (ktype > 0 && EC_KEY_get0_public_key(x) != NULL) {
uint8_t *pub = NULL;
size_t pub_len = EC_KEY_key2buf(x, EC_KEY_get_conv_form(x), &pub, NULL);
if (pub_len == 0) {
return 0;
}
int ret = BIO_hexdump(bp, pub, pub_len, off);
OPENSSL_free(pub);
if (!ret) {
OPENSSL_PUT_ERROR(EVP, reason);
return 0;
}
OPENSSL_free(pub_key_bytes);
BN_free(order);
BN_CTX_free(ctx);
OPENSSL_free(buffer);
return ret;
}
return 1;
}
static int eckey_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *ctx) {
static int eckey_param_print(BIO *bp, const EVP_PKEY *pkey, int indent) {
return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 0);
}
static int eckey_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *ctx) {
static int eckey_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent) {
return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 1);
}
static int eckey_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *ctx) {
static int eckey_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent) {
return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 2);
}
typedef struct {
int type;
int (*pub_print)(BIO *out, const EVP_PKEY *pkey, int indent, ASN1_PCTX *pctx);
int (*priv_print)(BIO *out, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *pctx);
int (*param_print)(BIO *out, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *pctx);
int (*pub_print)(BIO *out, const EVP_PKEY *pkey, int indent);
int (*priv_print)(BIO *out, const EVP_PKEY *pkey, int indent);
int (*param_print)(BIO *out, const EVP_PKEY *pkey, int indent);
} EVP_PKEY_PRINT_METHOD;
static EVP_PKEY_PRINT_METHOD kPrintMethods[] = {
@ -465,7 +355,7 @@ int EVP_PKEY_print_public(BIO *out, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *pctx) {
EVP_PKEY_PRINT_METHOD *method = find_method(pkey->type);
if (method != NULL && method->pub_print != NULL) {
return method->pub_print(out, pkey, indent, pctx);
return method->pub_print(out, pkey, indent);
}
return print_unsupported(out, pkey, indent, "Public Key");
}
@ -474,7 +364,7 @@ int EVP_PKEY_print_private(BIO *out, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *pctx) {
EVP_PKEY_PRINT_METHOD *method = find_method(pkey->type);
if (method != NULL && method->priv_print != NULL) {
return method->priv_print(out, pkey, indent, pctx);
return method->priv_print(out, pkey, indent);
}
return print_unsupported(out, pkey, indent, "Private Key");
}
@ -483,7 +373,7 @@ int EVP_PKEY_print_params(BIO *out, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *pctx) {
EVP_PKEY_PRINT_METHOD *method = find_method(pkey->type);
if (method != NULL && method->param_print != NULL) {
return method->param_print(out, pkey, indent, pctx);
return method->param_print(out, pkey, indent);
}
return print_unsupported(out, pkey, indent, "Parameters");
}

2
include/openssl/bio.h
Unescape View File

@ -328,7 +328,7 @@ OPENSSL_EXPORT int BIO_printf(BIO *bio, const char *format, ...)
OPENSSL_EXPORT int BIO_indent(BIO *bio, unsigned indent, unsigned max_indent);
// BIO_hexdump writes a hex dump of |data| to |bio|. Each line will be indented
// by |indent| spaces.
// by |indent| spaces. It returns one on success and zero otherwise.
OPENSSL_EXPORT int BIO_hexdump(BIO *bio, const uint8_t *data, size_t len,
unsigned indent);

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