Update PKCS#7 enveloped data to new API.
[openssl.git] / crypto / rsa / rsa_pmeth.c
index 5401b05..01a4030 100644 (file)
@@ -1,3 +1,4 @@
+/* crypto/rsa/rsa_pmeth.c */
 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
  * project 2006.
  */
 #include <openssl/asn1t.h>
 #include <openssl/x509.h>
 #include <openssl/rsa.h>
+#include <openssl/evp.h>
 #include "evp_locl.h"
 
+extern int int_rsa_verify(int dtype, const unsigned char *m, unsigned int m_len,
+               unsigned char *rm, unsigned int *prm_len,
+               const unsigned char *sigbuf, unsigned int siglen,
+               RSA *rsa);
+
 /* RSA pkey context structure */
 
 typedef struct
@@ -69,8 +76,16 @@ typedef struct
        /* Key gen parameters */
        int nbits;
        BIGNUM *pub_exp;
+       /* Keygen callback info */
+       int gentmp[2];
        /* RSA padding mode */
        int pad_mode;
+       /* message digest */
+       const EVP_MD *md;
+       /* PSS/OAEP salt length */
+       int saltlen;
+       /* Temp buffer */
+       unsigned char *tbuf;
        } RSA_PKEY_CTX;
 
 static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
@@ -82,7 +97,25 @@ static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
        rctx->nbits = 1024;
        rctx->pub_exp = NULL;
        rctx->pad_mode = RSA_PKCS1_PADDING;
+       rctx->md = NULL;
+       rctx->tbuf = NULL;
+
+       rctx->saltlen = -2;
+
        ctx->data = rctx;
+       ctx->keygen_info = rctx->gentmp;
+       ctx->keygen_info_count = 2;
+       
+       return 1;
+       }
+
+static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
+       {
+       if (ctx->tbuf)
+               return 1;
+       ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey));
+       if (!ctx->tbuf)
+               return 0;
        return 1;
        }
 
@@ -93,16 +126,61 @@ static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
                {
                if (rctx->pub_exp)
                        BN_free(rctx->pub_exp);
+               if (rctx->tbuf)
+                       OPENSSL_free(rctx->tbuf);
+               OPENSSL_free(rctx);
                }
-       OPENSSL_free(rctx);
        }
 
 static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, int *siglen,
-                                        unsigned char *tbs, int tbslen)
+                                       const unsigned char *tbs, int tbslen)
        {
        int ret;
        RSA_PKEY_CTX *rctx = ctx->data;
-       ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
+       RSA *rsa = ctx->pkey->pkey.rsa;
+
+       if (rctx->md)
+               {
+               if (tbslen != EVP_MD_size(rctx->md))
+                       {
+                       RSAerr(RSA_F_PKEY_RSA_SIGN,
+                                       RSA_R_INVALID_DIGEST_LENGTH);
+                       return -1;
+                       }
+               if (rctx->pad_mode == RSA_X931_PADDING)
+                       {
+                       if (!setup_tbuf(rctx, ctx))
+                               return -1;
+                       memcpy(rctx->tbuf, tbs, tbslen);
+                       rctx->tbuf[tbslen] =
+                               RSA_X931_hash_id(EVP_MD_type(rctx->md));
+                       ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
+                                               sig, rsa, RSA_X931_PADDING);
+                       }
+               else if (rctx->pad_mode == RSA_PKCS1_PADDING)
+                       {
+                       unsigned int sltmp;
+                       ret = RSA_sign(EVP_MD_type(rctx->md),
+                                               tbs, tbslen, sig, &sltmp, rsa);
+                       if (ret <= 0)
+                               return ret;
+                       ret = sltmp;
+                       }
+               else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING)
+                       {
+                       if (!setup_tbuf(rctx, ctx))
+                               return -1;
+                       if (!RSA_padding_add_PKCS1_PSS(rsa, rctx->tbuf, tbs,
+                                               rctx->md, rctx->saltlen))
+                               return -1;
+                       ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
+                                               sig, rsa, RSA_NO_PADDING);
+                       }
+               else
+                       return -1;
+               }
+       else
+               ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
                                                        rctx->pad_mode);
        if (ret < 0)
                return ret;
@@ -112,21 +190,116 @@ static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, int *siglen,
 
 
 static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
-                                       unsigned char *sig, int *siglen,
-                                        unsigned char *tbs, int tbslen)
+                                       unsigned char *rout, int *routlen,
+                                        const unsigned char *sig, int siglen)
        {
        int ret;
        RSA_PKEY_CTX *rctx = ctx->data;
-       ret = RSA_public_decrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
+
+       if (rctx->md)
+               {
+               if (rctx->pad_mode == RSA_X931_PADDING)
+                       {
+                       if (!setup_tbuf(rctx, ctx))
+                               return -1;
+                       ret = RSA_public_decrypt(siglen, sig,
+                                               rctx->tbuf, ctx->pkey->pkey.rsa,
+                                               RSA_X931_PADDING);
+                       if (ret < 1)
+                               return 0;
+                       ret--;
+                       if (rctx->tbuf[ret] !=
+                               RSA_X931_hash_id(EVP_MD_type(rctx->md)))
+                               {
+                               RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
+                                               RSA_R_ALGORITHM_MISMATCH);
+                               return 0;
+                               }
+                       if (ret != EVP_MD_size(rctx->md))
+                               {
+                               RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
+                                       RSA_R_INVALID_DIGEST_LENGTH);
+                               return 0;
+                               }
+                       if (rout)
+                               memcpy(rout, rctx->tbuf, ret);
+                       }
+               else if (rctx->pad_mode == RSA_PKCS1_PADDING)
+                       {
+                       unsigned int sltmp;
+                       ret = int_rsa_verify(EVP_MD_type(rctx->md),
+                                               NULL, 0, rout, &sltmp,
+                                       sig, siglen, ctx->pkey->pkey.rsa);
+                       ret = sltmp;
+                       }
+               else
+                       return -1;
+               }
+       else
+               ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
                                                        rctx->pad_mode);
        if (ret < 0)
                return ret;
-       *siglen = ret;
+       *routlen = ret;
        return 1;
        }
 
+static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
+                                       const unsigned char *sig, int siglen,
+                                        const unsigned char *tbs, int tbslen)
+       {
+       RSA_PKEY_CTX *rctx = ctx->data;
+       RSA *rsa = ctx->pkey->pkey.rsa;
+       int rslen;
+       if (rctx->md)
+               {
+               if (rctx->pad_mode == RSA_PKCS1_PADDING)
+                       return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
+                                       sig, siglen, rsa);
+               if (rctx->pad_mode == RSA_X931_PADDING)
+                       {
+                       if (pkey_rsa_verifyrecover(ctx, NULL, &rslen,
+                                       sig, siglen) <= 0)
+                               return 0;
+                       }
+               else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING)
+                       {
+                       int ret;
+                       if (!setup_tbuf(rctx, ctx))
+                               return -1;
+                       ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
+                                                       rsa, RSA_NO_PADDING);
+                       if (ret <= 0)
+                               return 0;
+                       ret = RSA_verify_PKCS1_PSS(rsa, tbs, rctx->md,
+                                               rctx->tbuf, rctx->saltlen);
+                       if (ret <= 0)
+                               return 0;
+                       return 1;
+                       }
+               else
+                       return -1;
+               }
+       else
+               {
+               if (!setup_tbuf(rctx, ctx))
+                       return -1;
+               rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
+                                               rsa, rctx->pad_mode);
+               if (rslen <= 0)
+                       return 0;
+               }
+
+       if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
+               return 0;
+
+       return 1;
+                       
+       }
+       
+
 static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx, unsigned char *out, int *outlen,
-                                        unsigned char *in, int inlen)
+                                        const unsigned char *in, int inlen)
        {
        int ret;
        RSA_PKEY_CTX *rctx = ctx->data;
@@ -139,7 +312,7 @@ static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx, unsigned char *out, int *outlen,
        }
 
 static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx, unsigned char *out, int *outlen,
-                                        unsigned char *in, int inlen)
+                                        const unsigned char *in, int inlen)
        {
        int ret;
        RSA_PKEY_CTX *rctx = ctx->data;
@@ -151,20 +324,90 @@ static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx, unsigned char *out, int *outlen,
        return 1;
        }
 
+static int check_padding_md(const EVP_MD *md, int padding)
+       {
+       if (!md)
+               return 1;
+
+       if (padding == RSA_NO_PADDING)
+               {
+               RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
+               return 0;
+               }
+
+       if (padding == RSA_X931_PADDING)
+               {
+               if (RSA_X931_hash_id(EVP_MD_type(md)) == -1)
+                       {
+                       RSAerr(RSA_F_CHECK_PADDING_MD,
+                                               RSA_R_INVALID_X931_DIGEST);
+                       return 0;
+                       }
+               return 1;
+               }
+
+       return 1;
+       }
+                       
+
 static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
        {
        RSA_PKEY_CTX *rctx = ctx->data;
        switch (type)
                {
-
                case EVP_PKEY_CTRL_RSA_PADDING:
-               /* TODO: add PSS support */
-               if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_X931_PADDING))
+               if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING))
                        {
+                       if (!check_padding_md(rctx->md, p1))
+                               return 0;
+                       if (p1 == RSA_PKCS1_PSS_PADDING) 
+                               {
+                               if (ctx->operation == EVP_PKEY_OP_VERIFYRECOVER)
+                                       return -2;
+                               if (!rctx->md)
+                                       rctx->md = EVP_sha1();
+                               }
+                       if (p1 == RSA_PKCS1_OAEP_PADDING) 
+                               {
+                               if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
+                                       return -2;
+                               if (!rctx->md)
+                                       rctx->md = EVP_sha1();
+                               }
                        rctx->pad_mode = p1;
                        return 1;
                        }
-               return 0;
+               return -2;
+
+               case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
+               if (p1 < -2)
+                       return -2;
+               if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING)
+                       return -2;
+               rctx->saltlen = p1;
+               return 1;
+
+               case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
+               if (p1 < 256)
+                       return -2;
+               rctx->nbits = p1;
+               return 1;
+
+               case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
+               if (!p2)
+                       return -2;
+               rctx->pub_exp = p2;
+               return 1;
+
+               case EVP_PKEY_CTRL_MD:
+               if (!check_padding_md(p2, rctx->pad_mode))
+                       return 0;
+               rctx->md = p2;
+               return 1;
+
+               case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
+               case EVP_PKEY_CTRL_PKCS7_DECRYPT:
+               return 1;
 
                default:
                return -2;
@@ -190,28 +433,89 @@ static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
                        pm = RSA_PKCS1_OAEP_PADDING;
                else if (!strcmp(value, "x931"))
                        pm = RSA_X931_PADDING;
+               else if (!strcmp(value, "pss"))
+                       pm = RSA_PKCS1_PSS_PADDING;
                else
                        return -2;
-               return pkey_rsa_ctrl(ctx, EVP_PKEY_CTRL_RSA_PADDING, pm, NULL);
+               return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
+               }
+
+       if (!strcmp(type, "rsa_pss_saltlen"))
+               {
+               int saltlen;
+               saltlen = atoi(value);
+               return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
                }
+
+       if (!strcmp(type, "rsa_keygen_bits"))
+               {
+               int nbits;
+               nbits = atoi(value);
+               return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
+               }
+
+       if (!strcmp(type, "rsa_keygen_pubexp"))
+               {
+               int ret;
+               BIGNUM *pubexp = NULL;
+               if (!BN_asc2bn(&pubexp, value))
+                       return 0;
+               ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
+               if (ret <= 0)
+                       BN_free(pubexp);
+               return ret;
+               }
+
        return -2;
        }
 
+static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
+       {
+       RSA *rsa = NULL;
+       RSA_PKEY_CTX *rctx = ctx->data;
+       BN_GENCB *pcb, cb;
+       int ret;
+       if (!rctx->pub_exp)
+               {
+               rctx->pub_exp = BN_new();
+               if (!rctx->pub_exp || !BN_set_word(rctx->pub_exp, RSA_F4))
+                       return 0;
+               }
+       rsa = RSA_new();
+       if (!rsa)
+               return 0;
+       if (ctx->pkey_gencb)
+               {
+               pcb = &cb;
+               evp_pkey_set_cb_translate(pcb, ctx);
+               }
+       else
+               pcb = NULL;
+       ret = RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, pcb);
+       if (ret > 0)
+               EVP_PKEY_assign_RSA(pkey, rsa);
+       else
+               RSA_free(rsa);
+       return ret;
+       }
+
 const EVP_PKEY_METHOD rsa_pkey_meth = 
        {
        EVP_PKEY_RSA,
-       0,
+       EVP_PKEY_FLAG_AUTOARGLEN,
        pkey_rsa_init,
        pkey_rsa_cleanup,
 
        0,0,
 
-       0,0,
+       0,
+       pkey_rsa_keygen,
 
        0,
        pkey_rsa_sign,
 
-       0,0,
+       0,
+       pkey_rsa_verify,
 
        0,
        pkey_rsa_verifyrecover,
@@ -225,6 +529,8 @@ const EVP_PKEY_METHOD rsa_pkey_meth =
        0,
        pkey_rsa_decrypt,
 
+       0,0,
+
        pkey_rsa_ctrl,
        pkey_rsa_ctrl_str